Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 17567:5656140324ed
8030763: Validate global memory allocation
Summary: Add length checks where necessary
Reviewed-by: coleenp, mschoene
author | hseigel |
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date | Thu, 13 Feb 2014 11:28:17 -0500 |
parents | 86e6d691f2e1 |
children | 02f27ecb4f3a ff355e26c78d 5a32d2a3cc1e |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
12080 | 26 #include "code/codeCache.hpp" |
1972 | 27 #include "code/icBuffer.hpp" |
28 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
29 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
30 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
31 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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32 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 33 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
34 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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35 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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36 #include "gc_implementation/g1/g1EvacFailure.hpp" |
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37 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
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38 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 39 #include "gc_implementation/g1/g1MarkSweep.hpp" |
40 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
41 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
10405 | 42 #include "gc_implementation/g1/g1YCTypes.hpp" |
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43 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 44 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
45 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
46 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
10405 | 47 #include "gc_implementation/shared/gcHeapSummary.hpp" |
48 #include "gc_implementation/shared/gcTimer.hpp" | |
49 #include "gc_implementation/shared/gcTrace.hpp" | |
50 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 51 #include "gc_implementation/shared/isGCActiveMark.hpp" |
52 #include "memory/gcLocker.inline.hpp" | |
53 #include "memory/genOopClosures.inline.hpp" | |
54 #include "memory/generationSpec.hpp" | |
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55 #include "memory/referenceProcessor.hpp" |
1972 | 56 #include "oops/oop.inline.hpp" |
57 #include "oops/oop.pcgc.inline.hpp" | |
58 #include "runtime/vmThread.hpp" | |
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59 #include "utilities/ticks.hpp" |
342 | 60 |
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61 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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62 |
342 | 63 // turn it on so that the contents of the young list (scan-only / |
64 // to-be-collected) are printed at "strategic" points before / during | |
65 // / after the collection --- this is useful for debugging | |
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66 #define YOUNG_LIST_VERBOSE 0 |
342 | 67 // CURRENT STATUS |
68 // This file is under construction. Search for "FIXME". | |
69 | |
70 // INVARIANTS/NOTES | |
71 // | |
72 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 73 // serialized by acquiring the HeapLock. This happens in mem_allocate |
74 // and allocate_new_tlab, which are the "entry" points to the | |
75 // allocation code from the rest of the JVM. (Note that this does not | |
76 // apply to TLAB allocation, which is not part of this interface: it | |
77 // is done by clients of this interface.) | |
342 | 78 |
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79 // Notes on implementation of parallelism in different tasks. |
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80 // |
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81 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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82 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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83 // It does use run_task() which sets _n_workers in the task. |
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84 // G1ParTask executes g1_process_strong_roots() -> |
10405 | 85 // SharedHeap::process_strong_roots() which calls eventually to |
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86 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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87 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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88 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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89 // |
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90 |
342 | 91 // Local to this file. |
92 | |
93 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
94 SuspendibleThreadSet* _sts; | |
95 G1RemSet* _g1rs; | |
96 ConcurrentG1Refine* _cg1r; | |
97 bool _concurrent; | |
98 public: | |
99 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
100 G1RemSet* g1rs, | |
101 ConcurrentG1Refine* cg1r) : | |
102 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
103 {} | |
104 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
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105 bool oops_into_cset = _g1rs->refine_card(card_ptr, worker_i, false); |
1705 | 106 // This path is executed by the concurrent refine or mutator threads, |
107 // concurrently, and so we do not care if card_ptr contains references | |
108 // that point into the collection set. | |
109 assert(!oops_into_cset, "should be"); | |
110 | |
342 | 111 if (_concurrent && _sts->should_yield()) { |
112 // Caller will actually yield. | |
113 return false; | |
114 } | |
115 // Otherwise, we finished successfully; return true. | |
116 return true; | |
117 } | |
118 void set_concurrent(bool b) { _concurrent = b; } | |
119 }; | |
120 | |
121 | |
122 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
123 int _calls; | |
124 G1CollectedHeap* _g1h; | |
125 CardTableModRefBS* _ctbs; | |
126 int _histo[256]; | |
127 public: | |
128 ClearLoggedCardTableEntryClosure() : | |
12343 | 129 _calls(0), _g1h(G1CollectedHeap::heap()), _ctbs(_g1h->g1_barrier_set()) |
342 | 130 { |
131 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
132 } | |
133 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
134 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
135 _calls++; | |
136 unsigned char* ujb = (unsigned char*)card_ptr; | |
137 int ind = (int)(*ujb); | |
138 _histo[ind]++; | |
139 *card_ptr = -1; | |
140 } | |
141 return true; | |
142 } | |
143 int calls() { return _calls; } | |
144 void print_histo() { | |
145 gclog_or_tty->print_cr("Card table value histogram:"); | |
146 for (int i = 0; i < 256; i++) { | |
147 if (_histo[i] != 0) { | |
148 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
149 } | |
150 } | |
151 } | |
152 }; | |
153 | |
154 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
155 int _calls; | |
156 G1CollectedHeap* _g1h; | |
157 CardTableModRefBS* _ctbs; | |
158 public: | |
159 RedirtyLoggedCardTableEntryClosure() : | |
12343 | 160 _calls(0), _g1h(G1CollectedHeap::heap()), _ctbs(_g1h->g1_barrier_set()) {} |
161 | |
342 | 162 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
163 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
164 _calls++; | |
165 *card_ptr = 0; | |
166 } | |
167 return true; | |
168 } | |
169 int calls() { return _calls; } | |
170 }; | |
171 | |
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172 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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173 public: |
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174 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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175 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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176 return true; |
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177 } |
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178 }; |
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179 |
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180 YoungList::YoungList(G1CollectedHeap* g1h) : |
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181 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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182 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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183 guarantee(check_list_empty(false), "just making sure..."); |
342 | 184 } |
185 | |
186 void YoungList::push_region(HeapRegion *hr) { | |
187 assert(!hr->is_young(), "should not already be young"); | |
188 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
189 | |
190 hr->set_next_young_region(_head); | |
191 _head = hr; | |
192 | |
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193 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 194 ++_length; |
195 } | |
196 | |
197 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 198 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 199 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
200 | |
201 hr->set_next_young_region(_survivor_head); | |
202 if (_survivor_head == NULL) { | |
545 | 203 _survivor_tail = hr; |
342 | 204 } |
205 _survivor_head = hr; | |
206 ++_survivor_length; | |
207 } | |
208 | |
209 void YoungList::empty_list(HeapRegion* list) { | |
210 while (list != NULL) { | |
211 HeapRegion* next = list->get_next_young_region(); | |
212 list->set_next_young_region(NULL); | |
213 list->uninstall_surv_rate_group(); | |
214 list->set_not_young(); | |
215 list = next; | |
216 } | |
217 } | |
218 | |
219 void YoungList::empty_list() { | |
220 assert(check_list_well_formed(), "young list should be well formed"); | |
221 | |
222 empty_list(_head); | |
223 _head = NULL; | |
224 _length = 0; | |
225 | |
226 empty_list(_survivor_head); | |
227 _survivor_head = NULL; | |
545 | 228 _survivor_tail = NULL; |
342 | 229 _survivor_length = 0; |
230 | |
231 _last_sampled_rs_lengths = 0; | |
232 | |
233 assert(check_list_empty(false), "just making sure..."); | |
234 } | |
235 | |
236 bool YoungList::check_list_well_formed() { | |
237 bool ret = true; | |
238 | |
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239 uint length = 0; |
342 | 240 HeapRegion* curr = _head; |
241 HeapRegion* last = NULL; | |
242 while (curr != NULL) { | |
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243 if (!curr->is_young()) { |
342 | 244 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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245 "incorrectly tagged (y: %d, surv: %d)", |
342 | 246 curr->bottom(), curr->end(), |
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247 curr->is_young(), curr->is_survivor()); |
342 | 248 ret = false; |
249 } | |
250 ++length; | |
251 last = curr; | |
252 curr = curr->get_next_young_region(); | |
253 } | |
254 ret = ret && (length == _length); | |
255 | |
256 if (!ret) { | |
257 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
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258 gclog_or_tty->print_cr("### list has %u entries, _length is %u", |
342 | 259 length, _length); |
260 } | |
261 | |
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262 return ret; |
342 | 263 } |
264 | |
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265 bool YoungList::check_list_empty(bool check_sample) { |
342 | 266 bool ret = true; |
267 | |
268 if (_length != 0) { | |
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269 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %u", |
342 | 270 _length); |
271 ret = false; | |
272 } | |
273 if (check_sample && _last_sampled_rs_lengths != 0) { | |
274 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
275 ret = false; | |
276 } | |
277 if (_head != NULL) { | |
278 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
279 ret = false; | |
280 } | |
281 if (!ret) { | |
282 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
283 } | |
284 | |
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285 return ret; |
342 | 286 } |
287 | |
288 void | |
289 YoungList::rs_length_sampling_init() { | |
290 _sampled_rs_lengths = 0; | |
291 _curr = _head; | |
292 } | |
293 | |
294 bool | |
295 YoungList::rs_length_sampling_more() { | |
296 return _curr != NULL; | |
297 } | |
298 | |
299 void | |
300 YoungList::rs_length_sampling_next() { | |
301 assert( _curr != NULL, "invariant" ); | |
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302 size_t rs_length = _curr->rem_set()->occupied(); |
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303 |
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304 _sampled_rs_lengths += rs_length; |
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305 |
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306 // The current region may not yet have been added to the |
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307 // incremental collection set (it gets added when it is |
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308 // retired as the current allocation region). |
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309 if (_curr->in_collection_set()) { |
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310 // Update the collection set policy information for this region |
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311 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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312 } |
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313 |
342 | 314 _curr = _curr->get_next_young_region(); |
315 if (_curr == NULL) { | |
316 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
317 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
318 } | |
319 } | |
320 | |
321 void | |
322 YoungList::reset_auxilary_lists() { | |
323 guarantee( is_empty(), "young list should be empty" ); | |
324 assert(check_list_well_formed(), "young list should be well formed"); | |
325 | |
326 // Add survivor regions to SurvRateGroup. | |
327 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 328 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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329 |
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330 int young_index_in_cset = 0; |
342 | 331 for (HeapRegion* curr = _survivor_head; |
332 curr != NULL; | |
333 curr = curr->get_next_young_region()) { | |
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334 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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335 |
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336 // The region is a non-empty survivor so let's add it to |
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337 // the incremental collection set for the next evacuation |
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338 // pause. |
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339 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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340 young_index_in_cset += 1; |
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341 } |
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342 assert((uint) young_index_in_cset == _survivor_length, "post-condition"); |
342 | 343 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
344 | |
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345 _head = _survivor_head; |
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346 _length = _survivor_length; |
342 | 347 if (_survivor_head != NULL) { |
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348 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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349 assert(_survivor_length > 0, "invariant"); |
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350 _survivor_tail->set_next_young_region(NULL); |
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351 } |
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352 |
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353 // Don't clear the survivor list handles until the start of |
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354 // the next evacuation pause - we need it in order to re-tag |
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355 // the survivor regions from this evacuation pause as 'young' |
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356 // at the start of the next. |
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357 |
545 | 358 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 359 |
360 assert(check_list_well_formed(), "young list should be well formed"); | |
361 } | |
362 | |
363 void YoungList::print() { | |
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364 HeapRegion* lists[] = {_head, _survivor_head}; |
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365 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 366 |
367 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
368 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
369 HeapRegion *curr = lists[list]; | |
370 if (curr == NULL) | |
371 gclog_or_tty->print_cr(" empty"); | |
372 while (curr != NULL) { | |
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373 gclog_or_tty->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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374 HR_FORMAT_PARAMS(curr), |
342 | 375 curr->prev_top_at_mark_start(), |
376 curr->next_top_at_mark_start(), | |
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377 curr->age_in_surv_rate_group_cond()); |
342 | 378 curr = curr->get_next_young_region(); |
379 } | |
380 } | |
381 | |
382 gclog_or_tty->print_cr(""); | |
383 } | |
384 | |
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385 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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386 { |
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387 // Claim the right to put the region on the dirty cards region list |
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388 // by installing a self pointer. |
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389 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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390 if (next == NULL) { |
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391 HeapRegion* res = (HeapRegion*) |
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392 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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393 NULL); |
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394 if (res == NULL) { |
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395 HeapRegion* head; |
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396 do { |
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397 // Put the region to the dirty cards region list. |
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398 head = _dirty_cards_region_list; |
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399 next = (HeapRegion*) |
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400 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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401 if (next == head) { |
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402 assert(hr->get_next_dirty_cards_region() == hr, |
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403 "hr->get_next_dirty_cards_region() != hr"); |
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404 if (next == NULL) { |
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405 // The last region in the list points to itself. |
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406 hr->set_next_dirty_cards_region(hr); |
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407 } else { |
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408 hr->set_next_dirty_cards_region(next); |
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409 } |
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410 } |
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411 } while (next != head); |
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412 } |
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413 } |
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414 } |
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415 |
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416 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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417 { |
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418 HeapRegion* head; |
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419 HeapRegion* hr; |
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420 do { |
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421 head = _dirty_cards_region_list; |
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422 if (head == NULL) { |
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423 return NULL; |
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424 } |
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425 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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426 if (head == new_head) { |
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427 // The last region. |
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428 new_head = NULL; |
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429 } |
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430 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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431 head); |
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432 } while (hr != head); |
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433 assert(hr != NULL, "invariant"); |
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434 hr->set_next_dirty_cards_region(NULL); |
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435 return hr; |
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436 } |
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437 |
342 | 438 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 439 _cg1r->stop(); |
342 | 440 _cmThread->stop(); |
441 } | |
442 | |
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443 #ifdef ASSERT |
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444 // A region is added to the collection set as it is retired |
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445 // so an address p can point to a region which will be in the |
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446 // collection set but has not yet been retired. This method |
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447 // therefore is only accurate during a GC pause after all |
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448 // regions have been retired. It is used for debugging |
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449 // to check if an nmethod has references to objects that can |
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450 // be move during a partial collection. Though it can be |
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451 // inaccurate, it is sufficient for G1 because the conservative |
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452 // implementation of is_scavengable() for G1 will indicate that |
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453 // all nmethods must be scanned during a partial collection. |
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454 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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455 HeapRegion* hr = heap_region_containing(p); |
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456 return hr != NULL && hr->in_collection_set(); |
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457 } |
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458 #endif |
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459 |
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460 // Returns true if the reference points to an object that |
10405 | 461 // can move in an incremental collection. |
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462 bool G1CollectedHeap::is_scavengable(const void* p) { |
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463 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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464 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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465 HeapRegion* hr = heap_region_containing(p); |
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466 if (hr == NULL) { |
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467 // null |
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468 assert(p == NULL, err_msg("Not NULL " PTR_FORMAT ,p)); |
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469 return false; |
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470 } else { |
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471 return !hr->isHumongous(); |
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472 } |
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473 } |
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474 |
342 | 475 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
476 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
12343 | 477 CardTableModRefBS* ct_bs = g1_barrier_set(); |
342 | 478 |
479 // Count the dirty cards at the start. | |
480 CountNonCleanMemRegionClosure count1(this); | |
481 ct_bs->mod_card_iterate(&count1); | |
482 int orig_count = count1.n(); | |
483 | |
484 // First clear the logged cards. | |
485 ClearLoggedCardTableEntryClosure clear; | |
486 dcqs.set_closure(&clear); | |
487 dcqs.apply_closure_to_all_completed_buffers(); | |
488 dcqs.iterate_closure_all_threads(false); | |
489 clear.print_histo(); | |
490 | |
491 // Now ensure that there's no dirty cards. | |
492 CountNonCleanMemRegionClosure count2(this); | |
493 ct_bs->mod_card_iterate(&count2); | |
494 if (count2.n() != 0) { | |
495 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
496 count2.n(), orig_count); | |
497 } | |
498 guarantee(count2.n() == 0, "Card table should be clean."); | |
499 | |
500 RedirtyLoggedCardTableEntryClosure redirty; | |
501 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
502 dcqs.apply_closure_to_all_completed_buffers(); | |
503 dcqs.iterate_closure_all_threads(false); | |
504 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
505 clear.calls(), orig_count); | |
506 guarantee(redirty.calls() == clear.calls(), | |
507 "Or else mechanism is broken."); | |
508 | |
509 CountNonCleanMemRegionClosure count3(this); | |
510 ct_bs->mod_card_iterate(&count3); | |
511 if (count3.n() != orig_count) { | |
512 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
513 orig_count, count3.n()); | |
514 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
515 } | |
516 | |
517 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
518 } | |
519 | |
520 // Private class members. | |
521 | |
522 G1CollectedHeap* G1CollectedHeap::_g1h; | |
523 | |
524 // Private methods. | |
525 | |
2152 | 526 HeapRegion* |
2361 | 527 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 528 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
529 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
530 if (!_secondary_free_list.is_empty()) { | |
531 if (G1ConcRegionFreeingVerbose) { | |
532 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
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533 "secondary_free_list has %u entries", |
2152 | 534 _secondary_free_list.length()); |
535 } | |
536 // It looks as if there are free regions available on the | |
537 // secondary_free_list. Let's move them to the free_list and try | |
538 // again to allocate from it. | |
539 append_secondary_free_list(); | |
540 | |
541 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
542 "empty we should have moved at least one entry to the free_list"); | |
543 HeapRegion* res = _free_list.remove_head(); | |
544 if (G1ConcRegionFreeingVerbose) { | |
545 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
546 "allocated "HR_FORMAT" from secondary_free_list", | |
547 HR_FORMAT_PARAMS(res)); | |
548 } | |
549 return res; | |
550 } | |
551 | |
10405 | 552 // Wait here until we get notified either when (a) there are no |
2152 | 553 // more free regions coming or (b) some regions have been moved on |
554 // the secondary_free_list. | |
555 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
556 } | |
557 | |
558 if (G1ConcRegionFreeingVerbose) { | |
559 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
560 "could not allocate from secondary_free_list"); | |
561 } | |
562 return NULL; | |
563 } | |
564 | |
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565 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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566 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 567 "the only time we use this to allocate a humongous region is " |
568 "when we are allocating a single humongous region"); | |
569 | |
570 HeapRegion* res; | |
571 if (G1StressConcRegionFreeing) { | |
572 if (!_secondary_free_list.is_empty()) { | |
573 if (G1ConcRegionFreeingVerbose) { | |
574 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
575 "forced to look at the secondary_free_list"); | |
576 } | |
2361 | 577 res = new_region_try_secondary_free_list(); |
2152 | 578 if (res != NULL) { |
579 return res; | |
580 } | |
581 } | |
582 } | |
583 res = _free_list.remove_head_or_null(); | |
584 if (res == NULL) { | |
585 if (G1ConcRegionFreeingVerbose) { | |
586 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
587 "res == NULL, trying the secondary_free_list"); | |
588 } | |
2361 | 589 res = new_region_try_secondary_free_list(); |
2152 | 590 } |
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591 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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592 // Currently, only attempts to allocate GC alloc regions set |
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593 // do_expand to true. So, we should only reach here during a |
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594 // safepoint. If this assumption changes we might have to |
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595 // reconsider the use of _expand_heap_after_alloc_failure. |
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596 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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597 |
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598 ergo_verbose1(ErgoHeapSizing, |
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599 "attempt heap expansion", |
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600 ergo_format_reason("region allocation request failed") |
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601 ergo_format_byte("allocation request"), |
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602 word_size * HeapWordSize); |
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603 if (expand(word_size * HeapWordSize)) { |
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604 // Given that expand() succeeded in expanding the heap, and we |
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605 // always expand the heap by an amount aligned to the heap |
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606 // region size, the free list should in theory not be empty. So |
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607 // it would probably be OK to use remove_head(). But the extra |
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608 // check for NULL is unlikely to be a performance issue here (we |
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609 // just expanded the heap!) so let's just be conservative and |
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610 // use remove_head_or_null(). |
3766 | 611 res = _free_list.remove_head_or_null(); |
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612 } else { |
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613 _expand_heap_after_alloc_failure = false; |
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614 } |
342 | 615 } |
616 return res; | |
617 } | |
618 | |
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619 uint G1CollectedHeap::humongous_obj_allocate_find_first(uint num_regions, |
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620 size_t word_size) { |
2361 | 621 assert(isHumongous(word_size), "word_size should be humongous"); |
622 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
623 | |
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624 uint first = G1_NULL_HRS_INDEX; |
2152 | 625 if (num_regions == 1) { |
626 // Only one region to allocate, no need to go through the slower | |
10405 | 627 // path. The caller will attempt the expansion if this fails, so |
2152 | 628 // let's not try to expand here too. |
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629 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 630 if (hr != NULL) { |
631 first = hr->hrs_index(); | |
632 } else { | |
3766 | 633 first = G1_NULL_HRS_INDEX; |
2152 | 634 } |
635 } else { | |
636 // We can't allocate humongous regions while cleanupComplete() is | |
637 // running, since some of the regions we find to be empty might not | |
638 // yet be added to the free list and it is not straightforward to | |
639 // know which list they are on so that we can remove them. Note | |
640 // that we only need to do this if we need to allocate more than | |
641 // one region to satisfy the current humongous allocation | |
642 // request. If we are only allocating one region we use the common | |
643 // region allocation code (see above). | |
644 wait_while_free_regions_coming(); | |
2361 | 645 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 646 |
647 if (free_regions() >= num_regions) { | |
3766 | 648 first = _hrs.find_contiguous(num_regions); |
649 if (first != G1_NULL_HRS_INDEX) { | |
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650 for (uint i = first; i < first + num_regions; ++i) { |
3766 | 651 HeapRegion* hr = region_at(i); |
2152 | 652 assert(hr->is_empty(), "sanity"); |
2361 | 653 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 654 hr->set_pending_removal(true); |
655 } | |
656 _free_list.remove_all_pending(num_regions); | |
657 } | |
658 } | |
659 } | |
660 return first; | |
661 } | |
662 | |
2361 | 663 HeapWord* |
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664 G1CollectedHeap::humongous_obj_allocate_initialize_regions(uint first, |
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665 uint num_regions, |
2361 | 666 size_t word_size) { |
3766 | 667 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 668 assert(isHumongous(word_size), "word_size should be humongous"); |
669 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
670 | |
671 // Index of last region in the series + 1. | |
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672 uint last = first + num_regions; |
2361 | 673 |
674 // We need to initialize the region(s) we just discovered. This is | |
675 // a bit tricky given that it can happen concurrently with | |
676 // refinement threads refining cards on these regions and | |
677 // potentially wanting to refine the BOT as they are scanning | |
678 // those cards (this can happen shortly after a cleanup; see CR | |
679 // 6991377). So we have to set up the region(s) carefully and in | |
680 // a specific order. | |
681 | |
682 // The word size sum of all the regions we will allocate. | |
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683 size_t word_size_sum = (size_t) num_regions * HeapRegion::GrainWords; |
2361 | 684 assert(word_size <= word_size_sum, "sanity"); |
685 | |
686 // This will be the "starts humongous" region. | |
3766 | 687 HeapRegion* first_hr = region_at(first); |
2361 | 688 // The header of the new object will be placed at the bottom of |
689 // the first region. | |
690 HeapWord* new_obj = first_hr->bottom(); | |
691 // This will be the new end of the first region in the series that | |
10405 | 692 // should also match the end of the last region in the series. |
2361 | 693 HeapWord* new_end = new_obj + word_size_sum; |
694 // This will be the new top of the first region that will reflect | |
695 // this allocation. | |
696 HeapWord* new_top = new_obj + word_size; | |
697 | |
698 // First, we need to zero the header of the space that we will be | |
699 // allocating. When we update top further down, some refinement | |
700 // threads might try to scan the region. By zeroing the header we | |
701 // ensure that any thread that will try to scan the region will | |
702 // come across the zero klass word and bail out. | |
703 // | |
704 // NOTE: It would not have been correct to have used | |
705 // CollectedHeap::fill_with_object() and make the space look like | |
706 // an int array. The thread that is doing the allocation will | |
707 // later update the object header to a potentially different array | |
708 // type and, for a very short period of time, the klass and length | |
709 // fields will be inconsistent. This could cause a refinement | |
710 // thread to calculate the object size incorrectly. | |
711 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
712 | |
713 // We will set up the first region as "starts humongous". This | |
714 // will also update the BOT covering all the regions to reflect | |
715 // that there is a single object that starts at the bottom of the | |
716 // first region. | |
717 first_hr->set_startsHumongous(new_top, new_end); | |
718 | |
719 // Then, if there are any, we will set up the "continues | |
720 // humongous" regions. | |
721 HeapRegion* hr = NULL; | |
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722 for (uint i = first + 1; i < last; ++i) { |
3766 | 723 hr = region_at(i); |
2361 | 724 hr->set_continuesHumongous(first_hr); |
725 } | |
726 // If we have "continues humongous" regions (hr != NULL), then the | |
727 // end of the last one should match new_end. | |
728 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
729 | |
730 // Up to this point no concurrent thread would have been able to | |
731 // do any scanning on any region in this series. All the top | |
732 // fields still point to bottom, so the intersection between | |
733 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
734 // update the top fields, we'll do a storestore to make sure that | |
735 // no thread sees the update to top before the zeroing of the | |
736 // object header and the BOT initialization. | |
737 OrderAccess::storestore(); | |
738 | |
739 // Now that the BOT and the object header have been initialized, | |
740 // we can update top of the "starts humongous" region. | |
741 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
742 "new_top should be in this region"); | |
743 first_hr->set_top(new_top); | |
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744 if (_hr_printer.is_active()) { |
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745 HeapWord* bottom = first_hr->bottom(); |
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746 HeapWord* end = first_hr->orig_end(); |
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747 if ((first + 1) == last) { |
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748 // the series has a single humongous region |
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749 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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750 } else { |
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751 // the series has more than one humongous regions |
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752 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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753 } |
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754 } |
2361 | 755 |
756 // Now, we will update the top fields of the "continues humongous" | |
757 // regions. The reason we need to do this is that, otherwise, | |
758 // these regions would look empty and this will confuse parts of | |
759 // G1. For example, the code that looks for a consecutive number | |
760 // of empty regions will consider them empty and try to | |
761 // re-allocate them. We can extend is_empty() to also include | |
762 // !continuesHumongous(), but it is easier to just update the top | |
763 // fields here. The way we set top for all regions (i.e., top == | |
764 // end for all regions but the last one, top == new_top for the | |
765 // last one) is actually used when we will free up the humongous | |
766 // region in free_humongous_region(). | |
767 hr = NULL; | |
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768 for (uint i = first + 1; i < last; ++i) { |
3766 | 769 hr = region_at(i); |
2361 | 770 if ((i + 1) == last) { |
771 // last continues humongous region | |
772 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
773 "new_top should fall on this region"); | |
774 hr->set_top(new_top); | |
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775 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 776 } else { |
777 // not last one | |
778 assert(new_top > hr->end(), "new_top should be above this region"); | |
779 hr->set_top(hr->end()); | |
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780 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 781 } |
782 } | |
783 // If we have continues humongous regions (hr != NULL), then the | |
784 // end of the last one should match new_end and its top should | |
785 // match new_top. | |
786 assert(hr == NULL || | |
787 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
788 | |
789 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
790 _summary_bytes_used += first_hr->used(); | |
791 _humongous_set.add(first_hr); | |
792 | |
793 return new_obj; | |
794 } | |
795 | |
342 | 796 // If could fit into free regions w/o expansion, try. |
797 // Otherwise, if can expand, do so. | |
798 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 799 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 800 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
801 | |
802 verify_region_sets_optional(); | |
342 | 803 |
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804 size_t word_size_rounded = round_to(word_size, HeapRegion::GrainWords); |
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805 uint num_regions = (uint) (word_size_rounded / HeapRegion::GrainWords); |
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806 uint x_num = expansion_regions(); |
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807 uint fs = _hrs.free_suffix(); |
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808 uint first = humongous_obj_allocate_find_first(num_regions, word_size); |
3766 | 809 if (first == G1_NULL_HRS_INDEX) { |
2152 | 810 // The only thing we can do now is attempt expansion. |
6010
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811 if (fs + x_num >= num_regions) { |
2188
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812 // If the number of regions we're trying to allocate for this |
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813 // object is at most the number of regions in the free suffix, |
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814 // then the call to humongous_obj_allocate_find_first() above |
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815 // should have succeeded and we wouldn't be here. |
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816 // |
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817 // We should only be trying to expand when the free suffix is |
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818 // not sufficient for the object _and_ we have some expansion |
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819 // room available. |
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820 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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821 |
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822 ergo_verbose1(ErgoHeapSizing, |
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823 "attempt heap expansion", |
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824 ergo_format_reason("humongous allocation request failed") |
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825 ergo_format_byte("allocation request"), |
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826 word_size * HeapWordSize); |
2188
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827 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 828 // Even though the heap was expanded, it might not have |
829 // reached the desired size. So, we cannot assume that the | |
830 // allocation will succeed. | |
2188
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831 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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832 } |
2152 | 833 } |
834 } | |
835 | |
2361 | 836 HeapWord* result = NULL; |
3766 | 837 if (first != G1_NULL_HRS_INDEX) { |
2361 | 838 result = |
839 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
840 assert(result != NULL, "it should always return a valid result"); | |
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841 |
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842 // A successful humongous object allocation changes the used space |
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843 // information of the old generation so we need to recalculate the |
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844 // sizes and update the jstat counters here. |
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845 g1mm()->update_sizes(); |
2152 | 846 } |
847 | |
848 verify_region_sets_optional(); | |
2361 | 849 |
850 return result; | |
342 | 851 } |
852 | |
1973 | 853 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
854 assert_heap_not_locked_and_not_at_safepoint(); | |
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855 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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856 |
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857 unsigned int dummy_gc_count_before; |
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858 int dummy_gclocker_retry_count = 0; |
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859 return attempt_allocation(word_size, &dummy_gc_count_before, &dummy_gclocker_retry_count); |
342 | 860 } |
861 | |
862 HeapWord* | |
863 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 864 bool* gc_overhead_limit_was_exceeded) { |
865 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 866 |
10405 | 867 // Loop until the allocation is satisfied, or unsatisfied after GC. |
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868 for (int try_count = 1, gclocker_retry_count = 0; /* we'll return */; try_count += 1) { |
1973 | 869 unsigned int gc_count_before; |
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870 |
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871 HeapWord* result = NULL; |
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872 if (!isHumongous(word_size)) { |
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873 result = attempt_allocation(word_size, &gc_count_before, &gclocker_retry_count); |
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874 } else { |
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875 result = attempt_allocation_humongous(word_size, &gc_count_before, &gclocker_retry_count); |
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876 } |
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877 if (result != NULL) { |
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878 return result; |
342 | 879 } |
880 | |
881 // Create the garbage collection operation... | |
1973 | 882 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 883 // ...and get the VM thread to execute it. |
884 VMThread::execute(&op); | |
1973 | 885 |
886 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
887 // If the operation was successful we'll return the result even | |
888 // if it is NULL. If the allocation attempt failed immediately | |
889 // after a Full GC, it's unlikely we'll be able to allocate now. | |
890 HeapWord* result = op.result(); | |
891 if (result != NULL && !isHumongous(word_size)) { | |
892 // Allocations that take place on VM operations do not do any | |
893 // card dirtying and we have to do it here. We only have to do | |
894 // this for non-humongous allocations, though. | |
895 dirty_young_block(result, word_size); | |
896 } | |
342 | 897 return result; |
1973 | 898 } else { |
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899 if (gclocker_retry_count > GCLockerRetryAllocationCount) { |
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|
900 return NULL; |
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|
901 } |
1973 | 902 assert(op.result() == NULL, |
903 "the result should be NULL if the VM op did not succeed"); | |
342 | 904 } |
905 | |
906 // Give a warning if we seem to be looping forever. | |
907 if ((QueuedAllocationWarningCount > 0) && | |
908 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 909 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 910 } |
911 } | |
1973 | 912 |
913 ShouldNotReachHere(); | |
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|
914 return NULL; |
342 | 915 } |
916 | |
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917 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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918 unsigned int *gc_count_before_ret, |
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919 int* gclocker_retry_count_ret) { |
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920 // Make sure you read the note in attempt_allocation_humongous(). |
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|
921 |
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|
922 assert_heap_not_locked_and_not_at_safepoint(); |
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|
923 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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|
924 "be called for humongous allocation requests"); |
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|
925 |
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|
926 // We should only get here after the first-level allocation attempt |
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|
927 // (attempt_allocation()) failed to allocate. |
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|
928 |
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|
929 // We will loop until a) we manage to successfully perform the |
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|
930 // allocation or b) we successfully schedule a collection which |
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|
931 // fails to perform the allocation. b) is the only case when we'll |
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|
932 // return NULL. |
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|
933 HeapWord* result = NULL; |
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|
934 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
935 bool should_try_gc; |
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|
936 unsigned int gc_count_before; |
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|
937 |
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|
938 { |
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|
939 MutexLockerEx x(Heap_lock); |
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|
940 |
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|
941 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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|
942 false /* bot_updates */); |
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|
943 if (result != NULL) { |
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|
944 return result; |
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|
945 } |
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|
946 |
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|
947 // If we reach here, attempt_allocation_locked() above failed to |
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|
948 // allocate a new region. So the mutator alloc region should be NULL. |
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|
949 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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|
950 |
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|
951 if (GC_locker::is_active_and_needs_gc()) { |
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|
952 if (g1_policy()->can_expand_young_list()) { |
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953 // No need for an ergo verbose message here, |
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|
954 // can_expand_young_list() does this when it returns true. |
2433
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955 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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|
956 false /* bot_updates */); |
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|
957 if (result != NULL) { |
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|
958 return result; |
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|
959 } |
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|
960 } |
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|
961 should_try_gc = false; |
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962 } else { |
6106
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963 // The GCLocker may not be active but the GCLocker initiated |
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|
964 // GC may not yet have been performed (GCLocker::needs_gc() |
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|
965 // returns true). In this case we do not try this GC and |
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966 // wait until the GCLocker initiated GC is performed, and |
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967 // then retry the allocation. |
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|
968 if (GC_locker::needs_gc()) { |
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969 should_try_gc = false; |
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|
970 } else { |
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971 // Read the GC count while still holding the Heap_lock. |
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|
972 gc_count_before = total_collections(); |
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|
973 should_try_gc = true; |
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|
974 } |
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975 } |
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|
976 } |
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|
977 |
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|
978 if (should_try_gc) { |
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|
979 bool succeeded; |
12113
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brutisso
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|
980 result = do_collection_pause(word_size, gc_count_before, &succeeded, |
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981 GCCause::_g1_inc_collection_pause); |
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982 if (result != NULL) { |
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983 assert(succeeded, "only way to get back a non-NULL result"); |
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984 return result; |
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985 } |
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986 |
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987 if (succeeded) { |
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988 // If we get here we successfully scheduled a collection which |
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989 // failed to allocate. No point in trying to allocate |
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990 // further. We'll just return NULL. |
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991 MutexLockerEx x(Heap_lock); |
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992 *gc_count_before_ret = total_collections(); |
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993 return NULL; |
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994 } |
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995 } else { |
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996 if (*gclocker_retry_count_ret > GCLockerRetryAllocationCount) { |
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997 MutexLockerEx x(Heap_lock); |
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998 *gc_count_before_ret = total_collections(); |
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999 return NULL; |
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1000 } |
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1001 // The GCLocker is either active or the GCLocker initiated |
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1002 // GC has not yet been performed. Stall until it is and |
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1003 // then retry the allocation. |
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1004 GC_locker::stall_until_clear(); |
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1005 (*gclocker_retry_count_ret) += 1; |
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1006 } |
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1007 |
10405 | 1008 // We can reach here if we were unsuccessful in scheduling a |
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1009 // collection (because another thread beat us to it) or if we were |
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1010 // stalled due to the GC locker. In either can we should retry the |
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1011 // allocation attempt in case another thread successfully |
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1012 // performed a collection and reclaimed enough space. We do the |
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1013 // first attempt (without holding the Heap_lock) here and the |
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1014 // follow-on attempt will be at the start of the next loop |
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1015 // iteration (after taking the Heap_lock). |
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1016 result = _mutator_alloc_region.attempt_allocation(word_size, |
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1017 false /* bot_updates */); |
5963
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1018 if (result != NULL) { |
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1019 return result; |
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1020 } |
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1021 |
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1022 // Give a warning if we seem to be looping forever. |
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1023 if ((QueuedAllocationWarningCount > 0) && |
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1024 (try_count % QueuedAllocationWarningCount == 0)) { |
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1025 warning("G1CollectedHeap::attempt_allocation_slow() " |
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1026 "retries %d times", try_count); |
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1027 } |
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1028 } |
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1029 |
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1030 ShouldNotReachHere(); |
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1031 return NULL; |
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1032 } |
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1033 |
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1034 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1035 unsigned int * gc_count_before_ret, |
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1036 int* gclocker_retry_count_ret) { |
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1037 // The structure of this method has a lot of similarities to |
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1038 // attempt_allocation_slow(). The reason these two were not merged |
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1039 // into a single one is that such a method would require several "if |
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1040 // allocation is not humongous do this, otherwise do that" |
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1041 // conditional paths which would obscure its flow. In fact, an early |
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1042 // version of this code did use a unified method which was harder to |
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1043 // follow and, as a result, it had subtle bugs that were hard to |
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1044 // track down. So keeping these two methods separate allows each to |
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1045 // be more readable. It will be good to keep these two in sync as |
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1046 // much as possible. |
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|
1047 |
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|
1048 assert_heap_not_locked_and_not_at_safepoint(); |
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1049 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1050 "should only be called for humongous allocations"); |
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|
1051 |
4834
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1052 // Humongous objects can exhaust the heap quickly, so we should check if we |
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|
1053 // need to start a marking cycle at each humongous object allocation. We do |
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1054 // the check before we do the actual allocation. The reason for doing it |
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1055 // before the allocation is that we avoid having to keep track of the newly |
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1056 // allocated memory while we do a GC. |
4910
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|
1057 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
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1058 word_size)) { |
4834
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|
1059 collect(GCCause::_g1_humongous_allocation); |
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|
1060 } |
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|
1061 |
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1062 // We will loop until a) we manage to successfully perform the |
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1063 // allocation or b) we successfully schedule a collection which |
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|
1064 // fails to perform the allocation. b) is the only case when we'll |
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|
1065 // return NULL. |
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|
1066 HeapWord* result = NULL; |
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|
1067 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
1068 bool should_try_gc; |
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|
1069 unsigned int gc_count_before; |
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|
1070 |
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|
1071 { |
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|
1072 MutexLockerEx x(Heap_lock); |
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|
1073 |
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1074 // Given that humongous objects are not allocated in young |
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1075 // regions, we'll first try to do the allocation without doing a |
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1076 // collection hoping that there's enough space in the heap. |
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|
1077 result = humongous_obj_allocate(word_size); |
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|
1078 if (result != NULL) { |
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|
1079 return result; |
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|
1080 } |
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|
1081 |
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|
1082 if (GC_locker::is_active_and_needs_gc()) { |
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1083 should_try_gc = false; |
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|
1084 } else { |
6106
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1085 // The GCLocker may not be active but the GCLocker initiated |
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|
1086 // GC may not yet have been performed (GCLocker::needs_gc() |
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|
1087 // returns true). In this case we do not try this GC and |
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1088 // wait until the GCLocker initiated GC is performed, and |
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|
1089 // then retry the allocation. |
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1090 if (GC_locker::needs_gc()) { |
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|
1091 should_try_gc = false; |
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|
1092 } else { |
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|
1093 // Read the GC count while still holding the Heap_lock. |
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1094 gc_count_before = total_collections(); |
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|
1095 should_try_gc = true; |
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|
1096 } |
2433
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|
1097 } |
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|
1098 } |
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|
1099 |
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|
1100 if (should_try_gc) { |
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|
1101 // If we failed to allocate the humongous object, we should try to |
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1102 // do a collection pause (if we're allowed) in case it reclaims |
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1103 // enough space for the allocation to succeed after the pause. |
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1104 |
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1105 bool succeeded; |
12113
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1106 result = do_collection_pause(word_size, gc_count_before, &succeeded, |
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1107 GCCause::_g1_humongous_allocation); |
2433
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1108 if (result != NULL) { |
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1109 assert(succeeded, "only way to get back a non-NULL result"); |
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1110 return result; |
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1111 } |
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1112 |
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1113 if (succeeded) { |
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1114 // If we get here we successfully scheduled a collection which |
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1115 // failed to allocate. No point in trying to allocate |
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1116 // further. We'll just return NULL. |
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1117 MutexLockerEx x(Heap_lock); |
4910
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1118 *gc_count_before_ret = total_collections(); |
2433
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1119 return NULL; |
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1120 } |
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1121 } else { |
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1122 if (*gclocker_retry_count_ret > GCLockerRetryAllocationCount) { |
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1123 MutexLockerEx x(Heap_lock); |
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1124 *gc_count_before_ret = total_collections(); |
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1125 return NULL; |
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1126 } |
6106
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1127 // The GCLocker is either active or the GCLocker initiated |
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1128 // GC has not yet been performed. Stall until it is and |
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1129 // then retry the allocation. |
2433
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1130 GC_locker::stall_until_clear(); |
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1131 (*gclocker_retry_count_ret) += 1; |
2433
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1132 } |
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1133 |
10405 | 1134 // We can reach here if we were unsuccessful in scheduling a |
2433
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1135 // collection (because another thread beat us to it) or if we were |
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1136 // stalled due to the GC locker. In either can we should retry the |
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1137 // allocation attempt in case another thread successfully |
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1138 // performed a collection and reclaimed enough space. Give a |
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1139 // warning if we seem to be looping forever. |
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1140 |
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1141 if ((QueuedAllocationWarningCount > 0) && |
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1142 (try_count % QueuedAllocationWarningCount == 0)) { |
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1143 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1144 "retries %d times", try_count); |
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1145 } |
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1146 } |
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1147 |
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1148 ShouldNotReachHere(); |
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1149 return NULL; |
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1150 } |
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1151 |
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1152 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1153 bool expect_null_mutator_alloc_region) { |
2152 | 1154 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1155 assert(_mutator_alloc_region.get() == NULL || |
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1156 !expect_null_mutator_alloc_region, |
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1157 "the current alloc region was unexpectedly found to be non-NULL"); |
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1158 |
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1159 if (!isHumongous(word_size)) { |
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1160 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1161 false /* bot_updates */); |
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1162 } else { |
4829
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1163 HeapWord* result = humongous_obj_allocate(word_size); |
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1164 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
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1165 g1_policy()->set_initiate_conc_mark_if_possible(); |
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1166 } |
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1167 return result; |
2433
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1168 } |
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1169 |
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1170 ShouldNotReachHere(); |
342 | 1171 } |
1172 | |
1173 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
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1174 G1CollectedHeap* _g1h; |
342 | 1175 ModRefBarrierSet* _mr_bs; |
1176 public: | |
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1177 PostMCRemSetClearClosure(G1CollectedHeap* g1h, ModRefBarrierSet* mr_bs) : |
12080 | 1178 _g1h(g1h), _mr_bs(mr_bs) {} |
1179 | |
342 | 1180 bool doHeapRegion(HeapRegion* r) { |
12080 | 1181 HeapRegionRemSet* hrrs = r->rem_set(); |
1182 | |
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1183 if (r->continuesHumongous()) { |
12080 | 1184 // We'll assert that the strong code root list and RSet is empty |
1185 assert(hrrs->strong_code_roots_list_length() == 0, "sanity"); | |
1186 assert(hrrs->occupied() == 0, "RSet should be empty"); | |
342 | 1187 return false; |
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1188 } |
12080 | 1189 |
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1190 _g1h->reset_gc_time_stamps(r); |
12080 | 1191 hrrs->clear(); |
342 | 1192 // You might think here that we could clear just the cards |
1193 // corresponding to the used region. But no: if we leave a dirty card | |
1194 // in a region we might allocate into, then it would prevent that card | |
1195 // from being enqueued, and cause it to be missed. | |
1196 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1197 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
12080 | 1198 |
342 | 1199 return false; |
1200 } | |
1201 }; | |
1202 | |
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1203 void G1CollectedHeap::clear_rsets_post_compaction() { |
12343 | 1204 PostMCRemSetClearClosure rs_clear(this, g1_barrier_set()); |
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1205 heap_region_iterate(&rs_clear); |
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1206 } |
342 | 1207 |
626
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1208 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1209 G1CollectedHeap* _g1h; |
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1210 UpdateRSOopClosure _cl; |
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|
1211 int _worker_i; |
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1212 public: |
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1213 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1214 _cl(g1->g1_rem_set(), worker_i), |
626
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1215 _worker_i(worker_i), |
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1216 _g1h(g1) |
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1217 { } |
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|
1218 |
626
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1219 bool doHeapRegion(HeapRegion* r) { |
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1220 if (!r->continuesHumongous()) { |
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1221 _cl.set_from(r); |
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1222 r->oop_iterate(&_cl); |
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|
1223 } |
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1224 return false; |
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|
1225 } |
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|
1226 }; |
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|
1227 |
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1228 class ParRebuildRSTask: public AbstractGangTask { |
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|
1229 G1CollectedHeap* _g1; |
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1230 public: |
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1231 ParRebuildRSTask(G1CollectedHeap* g1) |
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1232 : AbstractGangTask("ParRebuildRSTask"), |
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1233 _g1(g1) |
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1234 { } |
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1235 |
4728
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1236 void work(uint worker_id) { |
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1237 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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1238 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
4095
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1239 _g1->workers()->active_workers(), |
626
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|
1240 HeapRegion::RebuildRSClaimValue); |
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1241 } |
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1242 }; |
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1243 |
3778
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1244 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1245 private: |
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1246 G1HRPrinter* _hr_printer; |
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1247 public: |
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1248 bool doHeapRegion(HeapRegion* hr) { |
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1249 assert(!hr->is_young(), "not expecting to find young regions"); |
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1250 // We only generate output for non-empty regions. |
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1251 if (!hr->is_empty()) { |
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1252 if (!hr->isHumongous()) { |
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1253 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1254 } else if (hr->startsHumongous()) { |
6254
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1255 if (hr->region_num() == 1) { |
3778
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|
1256 // single humongous region |
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|
1257 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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|
1258 } else { |
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|
1259 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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|
1260 } |
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|
1261 } else { |
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|
1262 assert(hr->continuesHumongous(), "only way to get here"); |
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1263 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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|
1264 } |
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|
1265 } |
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|
1266 return false; |
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|
1267 } |
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1268 |
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|
1269 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1270 : _hr_printer(hr_printer) { } |
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1271 }; |
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1272 |
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1273 void G1CollectedHeap::print_hrs_post_compaction() { |
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1274 PostCompactionPrinterClosure cl(hr_printer()); |
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1275 heap_region_iterate(&cl); |
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1276 } |
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1277 |
1973 | 1278 bool G1CollectedHeap::do_collection(bool explicit_gc, |
1656
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|
1279 bool clear_all_soft_refs, |
342 | 1280 size_t word_size) { |
2152 | 1281 assert_at_safepoint(true /* should_be_vm_thread */); |
1282 | |
1359
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1283 if (GC_locker::check_active_before_gc()) { |
1973 | 1284 return false; |
1359
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|
1285 } |
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1286 |
10405 | 1287 STWGCTimer* gc_timer = G1MarkSweep::gc_timer(); |
13400
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|
1288 gc_timer->register_gc_start(); |
10405 | 1289 |
1290 SerialOldTracer* gc_tracer = G1MarkSweep::gc_tracer(); | |
1291 gc_tracer->report_gc_start(gc_cause(), gc_timer->gc_start()); | |
1292 | |
2125
7246a374a9f2
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diff
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|
1293 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1294 ResourceMark rm; |
1295 | |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
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diff
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|
1296 print_heap_before_gc(); |
10405 | 1297 trace_heap_before_gc(gc_tracer); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
1298 |
10183
868d87ed63c8
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|
1299 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
1300 |
4072 | 1301 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1302 verify_region_sets_optional(); |
342 | 1303 |
1387
0bfd3fb24150
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diff
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|
1304 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
0bfd3fb24150
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|
1305 collector_policy()->should_clear_all_soft_refs(); |
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|
1306 |
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diff
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|
1307 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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|
1308 |
342 | 1309 { |
1310 IsGCActiveMark x; | |
1311 | |
1312 // Timing | |
6030 | 1313 assert(gc_cause() != GCCause::_java_lang_system_gc || explicit_gc, "invariant"); |
6007
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|
1314 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
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|
1315 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
6030 | 1316 |
342 | 1317 { |
10405 | 1318 GCTraceTime t(GCCauseString("Full GC", gc_cause()), G1Log::fine(), true, NULL); |
10098
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1319 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
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1320 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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|
1321 |
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1322 double start = os::elapsedTime(); |
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|
1323 g1_policy()->record_full_collection_start(); |
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|
1324 |
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1325 // Note: When we have a more flexible GC logging framework that |
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1326 // allows us to add optional attributes to a GC log record we |
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1327 // could consider timing and reporting how long we wait in the |
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|
1328 // following two methods. |
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|
1329 wait_while_free_regions_coming(); |
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|
1330 // If we start the compaction before the CM threads finish |
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|
1331 // scanning the root regions we might trip them over as we'll |
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|
1332 // be moving objects / updating references. So let's wait until |
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|
1333 // they are done. By telling them to abort, they should complete |
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|
1334 // early. |
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|
1335 _cm->root_regions()->abort(); |
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|
1336 _cm->root_regions()->wait_until_scan_finished(); |
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|
1337 append_secondary_free_list_if_not_empty_with_lock(); |
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|
1338 |
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|
1339 gc_prologue(true); |
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|
1340 increment_total_collections(true /* full gc */); |
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|
1341 increment_old_marking_cycles_started(); |
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|
1342 |
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|
1343 assert(used() == recalculate_used(), "Should be equal"); |
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|
1344 |
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|
1345 verify_before_gc(); |
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|
1346 |
10405 | 1347 pre_full_gc_dump(gc_timer); |
10098
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|
1348 |
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|
1349 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
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|
1350 |
71013d764f6e
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|
1351 // Disable discovery and empty the discovered lists |
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|
1352 // for the CM ref processor. |
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|
1353 ref_processor_cm()->disable_discovery(); |
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|
1354 ref_processor_cm()->abandon_partial_discovery(); |
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|
1355 ref_processor_cm()->verify_no_references_recorded(); |
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|
1356 |
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|
1357 // Abandon current iterations of concurrent marking and concurrent |
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|
1358 // refinement, if any are in progress. We have to do this before |
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|
1359 // wait_until_scan_finished() below. |
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|
1360 concurrent_mark()->abort(); |
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|
1361 |
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|
1362 // Make sure we'll choose a new allocation region afterwards. |
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|
1363 release_mutator_alloc_region(); |
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|
1364 abandon_gc_alloc_regions(); |
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|
1365 g1_rem_set()->cleanupHRRS(); |
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|
1366 |
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|
1367 // We should call this after we retire any currently active alloc |
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|
1368 // regions so that all the ALLOC / RETIRE events are generated |
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|
1369 // before the start GC event. |
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|
1370 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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|
1371 |
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|
1372 // We may have added regions to the current incremental collection |
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|
1373 // set between the last GC or pause and now. We need to clear the |
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|
1374 // incremental collection set and then start rebuilding it afresh |
71013d764f6e
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|
1375 // after this full GC. |
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|
1376 abandon_collection_set(g1_policy()->inc_cset_head()); |
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|
1377 g1_policy()->clear_incremental_cset(); |
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|
1378 g1_policy()->stop_incremental_cset_building(); |
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|
1379 |
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|
1380 tear_down_region_sets(false /* free_list_only */); |
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diff
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|
1381 g1_policy()->set_gcs_are_young(true); |
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|
1382 |
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|
1383 // See the comments in g1CollectedHeap.hpp and |
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|
1384 // G1CollectedHeap::ref_processing_init() about |
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|
1385 // how reference processing currently works in G1. |
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|
1386 |
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|
1387 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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|
1388 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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|
1389 |
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|
1390 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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|
1391 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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1392 |
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1393 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1394 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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|
1395 |
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|
1396 // Do collection work |
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|
1397 { |
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|
1398 HandleMark hm; // Discard invalid handles created during gc |
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1399 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
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|
1400 } |
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|
1401 |
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1402 assert(free_regions() == 0, "we should not have added any free regions"); |
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|
1403 rebuild_region_sets(false /* free_list_only */); |
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|
1404 |
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1405 // Enqueue any discovered reference objects that have |
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1406 // not been removed from the discovered lists. |
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1407 ref_processor_stw()->enqueue_discovered_references(); |
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|
1408 |
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|
1409 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
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|
1410 |
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|
1411 MemoryService::track_memory_usage(); |
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|
1412 |
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1413 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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1414 ref_processor_stw()->verify_no_references_recorded(); |
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|
1415 |
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|
1416 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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|
1417 ClassLoaderDataGraph::purge(); |
12080 | 1418 MetaspaceAux::verify_metrics(); |
10098
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|
1419 |
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|
1420 // Note: since we've just done a full GC, concurrent |
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1421 // marking is no longer active. Therefore we need not |
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|
1422 // re-enable reference discovery for the CM ref processor. |
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|
1423 // That will be done at the start of the next marking cycle. |
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|
1424 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1425 ref_processor_cm()->verify_no_references_recorded(); |
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|
1426 |
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|
1427 reset_gc_time_stamp(); |
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|
1428 // Since everything potentially moved, we will clear all remembered |
10405 | 1429 // sets, and clear all cards. Later we will rebuild remembered |
10098
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|
1430 // sets. We will also reset the GC time stamps of the regions. |
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|
1431 clear_rsets_post_compaction(); |
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|
1432 check_gc_time_stamps(); |
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|
1433 |
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|
1434 // Resize the heap if necessary. |
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|
1435 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
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|
1436 |
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|
1437 if (_hr_printer.is_active()) { |
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|
1438 // We should do this after we potentially resize the heap so |
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|
1439 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1440 // the end GC event. |
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|
1441 |
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|
1442 print_hrs_post_compaction(); |
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|
1443 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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|
1444 } |
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|
1445 |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
1446 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
194f52aa2f23
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changeset
|
1447 if (hot_card_cache->use_cache()) { |
194f52aa2f23
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changeset
|
1448 hot_card_cache->reset_card_counts(); |
194f52aa2f23
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|
1449 hot_card_cache->reset_hot_cache(); |
10098
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|
1450 } |
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|
1451 |
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|
1452 // Rebuild remembered sets of all regions. |
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|
1453 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1454 uint n_workers = |
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|
1455 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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|
1456 workers()->active_workers(), |
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changeset
|
1457 Threads::number_of_non_daemon_threads()); |
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|
1458 assert(UseDynamicNumberOfGCThreads || |
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|
1459 n_workers == workers()->total_workers(), |
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|
1460 "If not dynamic should be using all the workers"); |
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|
1461 workers()->set_active_workers(n_workers); |
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|
1462 // Set parallel threads in the heap (_n_par_threads) only |
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|
1463 // before a parallel phase and always reset it to 0 after |
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|
1464 // the phase so that the number of parallel threads does |
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|
1465 // no get carried forward to a serial phase where there |
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|
1466 // may be code that is "possibly_parallel". |
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|
1467 set_par_threads(n_workers); |
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|
1468 |
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|
1469 ParRebuildRSTask rebuild_rs_task(this); |
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|
1470 assert(check_heap_region_claim_values( |
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|
1471 HeapRegion::InitialClaimValue), "sanity check"); |
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|
1472 assert(UseDynamicNumberOfGCThreads || |
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|
1473 workers()->active_workers() == workers()->total_workers(), |
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|
1474 "Unless dynamic should use total workers"); |
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|
1475 // Use the most recent number of active workers |
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|
1476 assert(workers()->active_workers() > 0, |
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|
1477 "Active workers not properly set"); |
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|
1478 set_par_threads(workers()->active_workers()); |
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|
1479 workers()->run_task(&rebuild_rs_task); |
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|
1480 set_par_threads(0); |
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|
1481 assert(check_heap_region_claim_values( |
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|
1482 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1483 reset_heap_region_claim_values(); |
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|
1484 } else { |
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|
1485 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1486 heap_region_iterate(&rebuild_rs); |
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|
1487 } |
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|
1488 |
12080 | 1489 // Rebuild the strong code root lists for each region |
1490 rebuild_strong_code_roots(); | |
1491 | |
10098
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|
1492 if (true) { // FIXME |
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|
1493 MetaspaceGC::compute_new_size(); |
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|
1494 } |
342 | 1495 |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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diff
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|
1496 #ifdef TRACESPINNING |
10098
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|
1497 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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545
diff
changeset
|
1498 #endif |
05c6d52fa7a9
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jmasa
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545
diff
changeset
|
1499 |
10098
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|
1500 // Discard all rset updates |
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|
1501 JavaThread::dirty_card_queue_set().abandon_logs(); |
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|
1502 assert(!G1DeferredRSUpdate |
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|
1503 || (G1DeferredRSUpdate && |
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|
1504 (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
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|
1505 |
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|
1506 _young_list->reset_sampled_info(); |
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|
1507 // At this point there should be no regions in the |
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|
1508 // entire heap tagged as young. |
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|
1509 assert(check_young_list_empty(true /* check_heap */), |
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|
1510 "young list should be empty at this point"); |
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|
1511 |
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|
1512 // Update the number of full collections that have been completed. |
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|
1513 increment_old_marking_cycles_completed(false /* concurrent */); |
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|
1514 |
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|
1515 _hrs.verify_optional(); |
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|
1516 verify_region_sets_optional(); |
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|
1517 |
10373
3a4805ad0005
8015244: G1: Verification after a full GC is incorrectly placed.
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|
1518 verify_after_gc(); |
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|
1519 |
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1520 // Start a new incremental collection set for the next pause |
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1521 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1522 g1_policy()->start_incremental_cset_building(); |
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1523 |
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1524 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1525 // regions to the incremental collection set for the next |
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1526 // evacuation pause. |
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1527 clear_cset_fast_test(); |
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1528 |
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1529 init_mutator_alloc_region(); |
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1530 |
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1531 double end = os::elapsedTime(); |
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1532 g1_policy()->record_full_collection_end(); |
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1533 |
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1534 if (G1Log::fine()) { |
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1535 g1_policy()->print_heap_transition(); |
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1536 } |
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1537 |
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1538 // We must call G1MonitoringSupport::update_sizes() in the same scoping level |
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1539 // as an active TraceMemoryManagerStats object (i.e. before the destructor for the |
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1540 // TraceMemoryManagerStats is called) so that the G1 memory pools are updated |
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1541 // before any GC notifications are raised. |
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1542 g1mm()->update_sizes(); |
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1543 |
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1544 gc_epilogue(true); |
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1545 } |
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1546 |
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1547 if (G1Log::finer()) { |
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1548 g1_policy()->print_detailed_heap_transition(true /* full */); |
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1549 } |
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1550 |
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1551 print_heap_after_gc(); |
10405 | 1552 trace_heap_after_gc(gc_tracer); |
1553 | |
1554 post_full_gc_dump(gc_timer); | |
1555 | |
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1556 gc_timer->register_gc_end(); |
10405 | 1557 gc_tracer->report_gc_end(gc_timer->gc_end(), gc_timer->time_partitions()); |
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1558 } |
1973 | 1559 |
1560 return true; | |
342 | 1561 } |
1562 | |
1563 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1564 // do_collection() will return whether it succeeded in performing |
1565 // the GC. Currently, there is no facility on the | |
1566 // do_full_collection() API to notify the caller than the collection | |
1567 // did not succeed (e.g., because it was locked out by the GC | |
1568 // locker). So, right now, we'll ignore the return value. | |
1569 bool dummy = do_collection(true, /* explicit_gc */ | |
1570 clear_all_soft_refs, | |
1571 0 /* word_size */); | |
342 | 1572 } |
1573 | |
1574 // This code is mostly copied from TenuredGeneration. | |
1575 void | |
1576 G1CollectedHeap:: | |
1577 resize_if_necessary_after_full_collection(size_t word_size) { | |
1578 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1579 | |
1580 // Include the current allocation, if any, and bytes that will be | |
1581 // pre-allocated to support collections, as "used". | |
1582 const size_t used_after_gc = used(); | |
1583 const size_t capacity_after_gc = capacity(); | |
1584 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1585 | |
1717
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1586 // This is enforced in arguments.cpp. |
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1587 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1588 "otherwise the code below doesn't make sense"); |
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1589 |
342 | 1590 // We don't have floating point command-line arguments |
1717
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1591 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1592 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1593 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1594 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1595 | |
1717
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1596 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1597 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1598 |
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1599 // We have to be careful here as these two calculations can overflow |
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1600 // 32-bit size_t's. |
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1601 double used_after_gc_d = (double) used_after_gc; |
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1602 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1603 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1604 |
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1605 // Let's make sure that they are both under the max heap size, which |
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1606 // by default will make them fit into a size_t. |
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1607 double desired_capacity_upper_bound = (double) max_heap_size; |
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1608 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1609 desired_capacity_upper_bound); |
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1610 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1611 desired_capacity_upper_bound); |
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1612 |
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1613 // We can now safely turn them into size_t's. |
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1614 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1615 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1616 |
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1617 // This assert only makes sense here, before we adjust them |
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1618 // with respect to the min and max heap size. |
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1619 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1620 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1621 "maximum_desired_capacity = "SIZE_FORMAT, |
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1622 minimum_desired_capacity, maximum_desired_capacity)); |
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1623 |
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1624 // Should not be greater than the heap max size. No need to adjust |
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1625 // it with respect to the heap min size as it's a lower bound (i.e., |
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1626 // we'll try to make the capacity larger than it, not smaller). |
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1627 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1628 // Should not be less than the heap min size. No need to adjust it |
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1629 // with respect to the heap max size as it's an upper bound (i.e., |
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1630 // we'll try to make the capacity smaller than it, not greater). |
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1631 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1632 |
1717
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1633 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1634 // Don't expand unless it's significant |
1635 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1636 ergo_verbose4(ErgoHeapSizing, |
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1637 "attempt heap expansion", |
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1638 ergo_format_reason("capacity lower than " |
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1639 "min desired capacity after Full GC") |
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1640 ergo_format_byte("capacity") |
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1641 ergo_format_byte("occupancy") |
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1642 ergo_format_byte_perc("min desired capacity"), |
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1643 capacity_after_gc, used_after_gc, |
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1644 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1645 expand(expand_bytes); |
342 | 1646 |
1647 // No expansion, now see if we want to shrink | |
1717
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1648 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1649 // Capacity too large, compute shrinking size |
1650 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
3914
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1651 ergo_verbose4(ErgoHeapSizing, |
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1652 "attempt heap shrinking", |
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1653 ergo_format_reason("capacity higher than " |
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1654 "max desired capacity after Full GC") |
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1655 ergo_format_byte("capacity") |
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1656 ergo_format_byte("occupancy") |
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1657 ergo_format_byte_perc("max desired capacity"), |
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1658 capacity_after_gc, used_after_gc, |
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1659 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1660 shrink(shrink_bytes); |
1661 } | |
1662 } | |
1663 | |
1664 | |
1665 HeapWord* | |
1973 | 1666 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1667 bool* succeeded) { | |
2152 | 1668 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1669 |
1670 *succeeded = true; | |
1671 // Let's attempt the allocation first. | |
2433
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1672 HeapWord* result = |
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1673 attempt_allocation_at_safepoint(word_size, |
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1674 false /* expect_null_mutator_alloc_region */); |
1973 | 1675 if (result != NULL) { |
1676 assert(*succeeded, "sanity"); | |
1677 return result; | |
1678 } | |
342 | 1679 |
1680 // In a G1 heap, we're supposed to keep allocation from failing by | |
1681 // incremental pauses. Therefore, at least for now, we'll favor | |
1682 // expansion over collection. (This might change in the future if we can | |
1683 // do something smarter than full collection to satisfy a failed alloc.) | |
1684 result = expand_and_allocate(word_size); | |
1685 if (result != NULL) { | |
1973 | 1686 assert(*succeeded, "sanity"); |
342 | 1687 return result; |
1688 } | |
1689 | |
1973 | 1690 // Expansion didn't work, we'll try to do a Full GC. |
1691 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1692 false, /* clear_all_soft_refs */ | |
1693 word_size); | |
1694 if (!gc_succeeded) { | |
1695 *succeeded = false; | |
1696 return NULL; | |
1697 } | |
1698 | |
1699 // Retry the allocation | |
1700 result = attempt_allocation_at_safepoint(word_size, | |
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1701 true /* expect_null_mutator_alloc_region */); |
342 | 1702 if (result != NULL) { |
1973 | 1703 assert(*succeeded, "sanity"); |
342 | 1704 return result; |
1705 } | |
1706 | |
1973 | 1707 // Then, try a Full GC that will collect all soft references. |
1708 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1709 true, /* clear_all_soft_refs */ | |
1710 word_size); | |
1711 if (!gc_succeeded) { | |
1712 *succeeded = false; | |
1713 return NULL; | |
1714 } | |
1715 | |
1716 // Retry the allocation once more | |
1717 result = attempt_allocation_at_safepoint(word_size, | |
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1718 true /* expect_null_mutator_alloc_region */); |
342 | 1719 if (result != NULL) { |
1973 | 1720 assert(*succeeded, "sanity"); |
342 | 1721 return result; |
1722 } | |
1723 | |
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1724 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1725 "Flag should have been handled and cleared prior to this point"); |
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1726 |
342 | 1727 // What else? We might try synchronous finalization later. If the total |
1728 // space available is large enough for the allocation, then a more | |
1729 // complete compaction phase than we've tried so far might be | |
1730 // appropriate. | |
1973 | 1731 assert(*succeeded, "sanity"); |
342 | 1732 return NULL; |
1733 } | |
1734 | |
1735 // Attempting to expand the heap sufficiently | |
1736 // to support an allocation of the given "word_size". If | |
1737 // successful, perform the allocation and return the address of the | |
1738 // allocated block, or else "NULL". | |
1739 | |
1740 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1741 assert_at_safepoint(true /* should_be_vm_thread */); |
1742 | |
1743 verify_region_sets_optional(); | |
1973 | 1744 |
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1745 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1746 ergo_verbose1(ErgoHeapSizing, |
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1747 "attempt heap expansion", |
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1748 ergo_format_reason("allocation request failed") |
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1749 ergo_format_byte("allocation request"), |
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1750 word_size * HeapWordSize); |
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1751 if (expand(expand_bytes)) { |
3766 | 1752 _hrs.verify_optional(); |
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1753 verify_region_sets_optional(); |
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1754 return attempt_allocation_at_safepoint(word_size, |
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1755 false /* expect_null_mutator_alloc_region */); |
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1756 } |
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1757 return NULL; |
342 | 1758 } |
1759 | |
3766 | 1760 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1761 HeapWord* new_end) { | |
1762 assert(old_end != new_end, "don't call this otherwise"); | |
1763 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1764 | |
1765 // Update the committed mem region. | |
1766 _g1_committed.set_end(new_end); | |
1767 // Tell the card table about the update. | |
1768 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1769 // Tell the BOT about the update. | |
1770 _bot_shared->resize(_g1_committed.word_size()); | |
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1771 // Tell the hot card cache about the update |
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1772 _cg1r->hot_card_cache()->resize_card_counts(capacity()); |
3766 | 1773 } |
1774 | |
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1775 bool G1CollectedHeap::expand(size_t expand_bytes) { |
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1776 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1777 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1778 HeapRegion::GrainBytes); | |
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1779 ergo_verbose2(ErgoHeapSizing, |
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1780 "expand the heap", |
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1781 ergo_format_byte("requested expansion amount") |
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1782 ergo_format_byte("attempted expansion amount"), |
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1783 expand_bytes, aligned_expand_bytes); |
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1784 |
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1785 if (_g1_storage.uncommitted_size() == 0) { |
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1786 ergo_verbose0(ErgoHeapSizing, |
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1787 "did not expand the heap", |
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1788 ergo_format_reason("heap already fully expanded")); |
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1789 return false; |
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1790 } |
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1791 |
3766 | 1792 // First commit the memory. |
1793 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1794 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1795 if (successful) { |
3766 | 1796 // Then propagate this update to the necessary data structures. |
1797 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1798 update_committed_space(old_end, new_end); | |
1799 | |
1800 FreeRegionList expansion_list("Local Expansion List"); | |
1801 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1802 assert(mr.start() == old_end, "post-condition"); | |
1803 // mr might be a smaller region than what was requested if | |
1804 // expand_by() was unable to allocate the HeapRegion instances | |
1805 assert(mr.end() <= new_end, "post-condition"); | |
1806 | |
1807 size_t actual_expand_bytes = mr.byte_size(); | |
1808 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1809 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1810 "post-condition"); | |
1811 if (actual_expand_bytes < aligned_expand_bytes) { | |
1812 // We could not expand _hrs to the desired size. In this case we | |
1813 // need to shrink the committed space accordingly. | |
1814 assert(mr.end() < new_end, "invariant"); | |
1815 | |
1816 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1817 // First uncommit the memory. | |
1818 _g1_storage.shrink_by(diff_bytes); | |
1819 // Then propagate this update to the necessary data structures. | |
1820 update_committed_space(new_end, mr.end()); | |
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1821 } |
3766 | 1822 _free_list.add_as_tail(&expansion_list); |
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1823 |
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1824 if (_hr_printer.is_active()) { |
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1825 HeapWord* curr = mr.start(); |
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1826 while (curr < mr.end()) { |
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1827 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1828 _hr_printer.commit(curr, curr_end); |
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1829 curr = curr_end; |
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1830 } |
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1831 assert(curr == mr.end(), "post-condition"); |
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1832 } |
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1833 g1_policy()->record_new_heap_size(n_regions()); |
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1834 } else { |
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1835 ergo_verbose0(ErgoHeapSizing, |
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1836 "did not expand the heap", |
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1837 ergo_format_reason("heap expansion operation failed")); |
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1838 // The expansion of the virtual storage space was unsuccessful. |
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1839 // Let's see if it was because we ran out of swap. |
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1840 if (G1ExitOnExpansionFailure && |
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1841 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1842 // We had head room... |
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1843 vm_exit_out_of_memory(aligned_expand_bytes, OOM_MMAP_ERROR, "G1 heap expansion"); |
342 | 1844 } |
1845 } | |
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1846 return successful; |
342 | 1847 } |
1848 | |
3766 | 1849 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1850 size_t aligned_shrink_bytes = |
1851 ReservedSpace::page_align_size_down(shrink_bytes); | |
1852 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1853 HeapRegion::GrainBytes); | |
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1854 uint num_regions_to_remove = (uint)(shrink_bytes / HeapRegion::GrainBytes); |
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1855 |
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1856 uint num_regions_removed = _hrs.shrink_by(num_regions_to_remove); |
3766 | 1857 HeapWord* old_end = (HeapWord*) _g1_storage.high(); |
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1858 size_t shrunk_bytes = num_regions_removed * HeapRegion::GrainBytes; |
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1859 |
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1860 ergo_verbose3(ErgoHeapSizing, |
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1861 "shrink the heap", |
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1862 ergo_format_byte("requested shrinking amount") |
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1863 ergo_format_byte("aligned shrinking amount") |
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1864 ergo_format_byte("attempted shrinking amount"), |
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1865 shrink_bytes, aligned_shrink_bytes, shrunk_bytes); |
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1866 if (num_regions_removed > 0) { |
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1867 _g1_storage.shrink_by(shrunk_bytes); |
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1868 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
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1869 |
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1870 if (_hr_printer.is_active()) { |
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1871 HeapWord* curr = old_end; |
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1872 while (curr > new_end) { |
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1873 HeapWord* curr_end = curr; |
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1874 curr -= HeapRegion::GrainWords; |
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1875 _hr_printer.uncommit(curr, curr_end); |
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1876 } |
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1877 } |
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1878 |
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1879 _expansion_regions += num_regions_removed; |
3766 | 1880 update_committed_space(old_end, new_end); |
1881 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1882 g1_policy()->record_new_heap_size(n_regions()); |
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1883 } else { |
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1884 ergo_verbose0(ErgoHeapSizing, |
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1885 "did not shrink the heap", |
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1886 ergo_format_reason("heap shrinking operation failed")); |
342 | 1887 } |
1888 } | |
1889 | |
1890 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1891 verify_region_sets_optional(); |
1892 | |
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1893 // We should only reach here at the end of a Full GC which means we |
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1894 // should not not be holding to any GC alloc regions. The method |
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1895 // below will make sure of that and do any remaining clean up. |
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1896 abandon_gc_alloc_regions(); |
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1897 |
2152 | 1898 // Instead of tearing down / rebuilding the free lists here, we |
1899 // could instead use the remove_all_pending() method on free_list to | |
1900 // remove only the ones that we need to remove. | |
4072 | 1901 tear_down_region_sets(true /* free_list_only */); |
342 | 1902 shrink_helper(shrink_bytes); |
4072 | 1903 rebuild_region_sets(true /* free_list_only */); |
2152 | 1904 |
3766 | 1905 _hrs.verify_optional(); |
2152 | 1906 verify_region_sets_optional(); |
342 | 1907 } |
1908 | |
1909 // Public methods. | |
1910 | |
1911 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1912 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1913 #endif // _MSC_VER | |
1914 | |
1915 | |
1916 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1917 SharedHeap(policy_), | |
1918 _g1_policy(policy_), | |
1111 | 1919 _dirty_card_queue_set(false), |
1705 | 1920 _into_cset_dirty_card_queue_set(false), |
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1921 _is_alive_closure_cm(this), |
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1922 _is_alive_closure_stw(this), |
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1923 _ref_processor_cm(NULL), |
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1924 _ref_processor_stw(NULL), |
342 | 1925 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1926 _bot_shared(NULL), | |
10405 | 1927 _evac_failure_scan_stack(NULL), |
342 | 1928 _mark_in_progress(false), |
2152 | 1929 _cg1r(NULL), _summary_bytes_used(0), |
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1930 _g1mm(NULL), |
342 | 1931 _refine_cte_cl(NULL), |
1932 _full_collection(false), | |
2152 | 1933 _free_list("Master Free List"), |
1934 _secondary_free_list("Secondary Free List"), | |
4072 | 1935 _old_set("Old Set"), |
2152 | 1936 _humongous_set("Master Humongous Set"), |
1937 _free_regions_coming(false), | |
342 | 1938 _young_list(new YoungList(this)), |
1939 _gc_time_stamp(0), | |
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1940 _retained_old_gc_alloc_region(NULL), |
6595 | 1941 _survivor_plab_stats(YoungPLABSize, PLABWeight), |
1942 _old_plab_stats(OldPLABSize, PLABWeight), | |
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1943 _expand_heap_after_alloc_failure(true), |
526 | 1944 _surviving_young_words(NULL), |
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1945 _old_marking_cycles_started(0), |
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1946 _old_marking_cycles_completed(0), |
10405 | 1947 _concurrent_cycle_started(false), |
526 | 1948 _in_cset_fast_test(NULL), |
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1949 _in_cset_fast_test_base(NULL), |
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1950 _dirty_cards_region_list(NULL), |
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1951 _worker_cset_start_region(NULL), |
10405 | 1952 _worker_cset_start_region_time_stamp(NULL), |
1953 _gc_timer_stw(new (ResourceObj::C_HEAP, mtGC) STWGCTimer()), | |
1954 _gc_timer_cm(new (ResourceObj::C_HEAP, mtGC) ConcurrentGCTimer()), | |
1955 _gc_tracer_stw(new (ResourceObj::C_HEAP, mtGC) G1NewTracer()), | |
1956 _gc_tracer_cm(new (ResourceObj::C_HEAP, mtGC) G1OldTracer()) { | |
1957 | |
1958 _g1h = this; | |
342 | 1959 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { |
1960 vm_exit_during_initialization("Failed necessary allocation."); | |
1961 } | |
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1962 |
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1963 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1964 |
342 | 1965 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1966 _task_queues = new RefToScanQueueSet(n_queues); | |
1967 | |
1968 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1969 assert(n_rem_sets > 0, "Invariant."); | |
1970 | |
6197 | 1971 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues, mtGC); |
1972 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues, mtGC); | |
10405 | 1973 _evacuation_failed_info_array = NEW_C_HEAP_ARRAY(EvacuationFailedInfo, n_queues, mtGC); |
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1974 |
342 | 1975 for (int i = 0; i < n_queues; i++) { |
1976 RefToScanQueue* q = new RefToScanQueue(); | |
1977 q->initialize(); | |
1978 _task_queues->register_queue(i, q); | |
10405 | 1979 ::new (&_evacuation_failed_info_array[i]) EvacuationFailedInfo(); |
1980 } | |
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1981 clear_cset_start_regions(); |
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1982 |
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1983 // Initialize the G1EvacuationFailureALot counters and flags. |
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1984 NOT_PRODUCT(reset_evacuation_should_fail();) |
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1985 |
342 | 1986 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1987 } | |
1988 | |
1989 jint G1CollectedHeap::initialize() { | |
1166 | 1990 CollectedHeap::pre_initialize(); |
342 | 1991 os::enable_vtime(); |
1992 | |
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1993 G1Log::init(); |
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1994 |
342 | 1995 // Necessary to satisfy locking discipline assertions. |
1996 | |
1997 MutexLocker x(Heap_lock); | |
1998 | |
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1999 // We have to initialize the printer before committing the heap, as |
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2000 // it will be used then. |
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2001 _hr_printer.set_active(G1PrintHeapRegions); |
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2002 |
342 | 2003 // While there are no constraints in the GC code that HeapWordSize |
2004 // be any particular value, there are multiple other areas in the | |
2005 // system which believe this to be true (e.g. oop->object_size in some | |
2006 // cases incorrectly returns the size in wordSize units rather than | |
2007 // HeapWordSize). | |
2008 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
2009 | |
2010 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
2011 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
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2012 size_t heap_alignment = collector_policy()->heap_alignment(); |
342 | 2013 |
2014 // Ensure that the sizes are properly aligned. | |
2015 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
2016 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
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2017 Universe::check_alignment(max_byte_size, heap_alignment, "g1 heap"); |
342 | 2018 |
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2019 _cg1r = new ConcurrentG1Refine(this); |
342 | 2020 |
2021 // Reserve the maximum. | |
642
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2022 |
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2023 // When compressed oops are enabled, the preferred heap base |
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2024 // is calculated by subtracting the requested size from the |
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2025 // 32Gb boundary and using the result as the base address for |
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2026 // heap reservation. If the requested size is not aligned to |
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2027 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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2028 // into the ReservedHeapSpace constructor) then the actual |
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2029 // base of the reserved heap may end up differing from the |
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2030 // address that was requested (i.e. the preferred heap base). |
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2031 // If this happens then we could end up using a non-optimal |
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2032 // compressed oops mode. |
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2033 |
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2034 ReservedSpace heap_rs = Universe::reserve_heap(max_byte_size, |
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2035 heap_alignment); |
342 | 2036 |
2037 // It is important to do this in a way such that concurrent readers can't | |
10405 | 2038 // temporarily think something is in the heap. (I've actually seen this |
342 | 2039 // happen in asserts: DLD.) |
2040 _reserved.set_word_size(0); | |
2041 _reserved.set_start((HeapWord*)heap_rs.base()); | |
2042 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
2043 | |
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2044 _expansion_regions = (uint) (max_byte_size / HeapRegion::GrainBytes); |
342 | 2045 |
2046 // Create the gen rem set (and barrier set) for the entire reserved region. | |
2047 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
2048 set_barrier_set(rem_set()->bs()); | |
12343 | 2049 if (!barrier_set()->is_a(BarrierSet::G1SATBCTLogging)) { |
2050 vm_exit_during_initialization("G1 requires a G1SATBLoggingCardTableModRefBS"); | |
342 | 2051 return JNI_ENOMEM; |
2052 } | |
2053 | |
2054 // Also create a G1 rem set. | |
12343 | 2055 _g1_rem_set = new G1RemSet(this, g1_barrier_set()); |
342 | 2056 |
2057 // Carve out the G1 part of the heap. | |
2058 | |
2059 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2060 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2061 g1_rs.size()/HeapWordSize); | |
2062 | |
2063 _g1_storage.initialize(g1_rs, 0); | |
2064 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2065 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
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2066 (HeapWord*) _g1_reserved.end()); |
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2067 assert(_hrs.max_length() == _expansion_regions, |
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2068 err_msg("max length: %u expansion regions: %u", |
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2069 _hrs.max_length(), _expansion_regions)); |
342 | 2070 |
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2071 // Do later initialization work for concurrent refinement. |
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2072 _cg1r->init(); |
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2073 |
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2074 // 6843694 - ensure that the maximum region index can fit |
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2075 // in the remembered set structures. |
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2076 const uint max_region_idx = (1U << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
807
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2077 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2078 |
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2079 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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2080 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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2081 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2082 "too many cards per region"); |
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2083 |
2152 | 2084 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2085 | |
342 | 2086 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2087 heap_word_size(init_byte_size)); | |
2088 | |
2089 _g1h = this; | |
2090 | |
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2091 _in_cset_fast_test_length = max_regions(); |
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2092 _in_cset_fast_test_base = |
6197 | 2093 NEW_C_HEAP_ARRAY(bool, (size_t) _in_cset_fast_test_length, mtGC); |
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2094 |
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2095 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2096 // beginning of the heap every time we want to index; basically |
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2097 // it's the same with what we do with the card table. |
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2098 _in_cset_fast_test = _in_cset_fast_test_base - |
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2099 ((uintx) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2100 |
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2101 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2102 // regions to the incremental collection set for the first |
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2103 // evacuation pause. |
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2104 clear_cset_fast_test(); |
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2105 |
342 | 2106 // Create the ConcurrentMark data structure and thread. |
2107 // (Must do this late, so that "max_regions" is defined.) | |
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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7207
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|
2108 _cm = new ConcurrentMark(this, heap_rs); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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7207
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|
2109 if (_cm == NULL || !_cm->completed_initialization()) { |
442f942757c0
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johnc
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7207
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|
2110 vm_shutdown_during_initialization("Could not create/initialize ConcurrentMark"); |
442f942757c0
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|
2111 return JNI_ENOMEM; |
442f942757c0
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diff
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|
2112 } |
342 | 2113 _cmThread = _cm->cmThread(); |
2114 | |
2115 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2116 HeapRegionRemSet::init_heap(max_regions()); | |
2117 | |
677 | 2118 // Now expand into the initial heap size. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
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|
2119 if (!expand(init_byte_size)) { |
7397
442f942757c0
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johnc
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|
2120 vm_shutdown_during_initialization("Failed to allocate initial heap."); |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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parents:
2173
diff
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|
2121 return JNI_ENOMEM; |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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2173
diff
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|
2122 } |
342 | 2123 |
2124 // Perform any initialization actions delegated to the policy. | |
2125 g1_policy()->init(); | |
2126 | |
2127 _refine_cte_cl = | |
2128 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2129 g1_rem_set(), | |
2130 concurrent_g1_refine()); | |
2131 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2132 | |
2133 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2134 SATB_Q_FL_lock, | |
1111 | 2135 G1SATBProcessCompletedThreshold, |
342 | 2136 Shared_SATB_Q_lock); |
794 | 2137 |
2138 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2139 DirtyCardQ_FL_lock, | |
1111 | 2140 concurrent_g1_refine()->yellow_zone(), |
2141 concurrent_g1_refine()->red_zone(), | |
794 | 2142 Shared_DirtyCardQ_lock); |
2143 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
2144 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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595
diff
changeset
|
2145 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
2146 DirtyCardQ_FL_lock, |
1111 | 2147 -1, // never trigger processing |
2148 -1, // no limit on length | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2149 Shared_DirtyCardQ_lock, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2150 &JavaThread::dirty_card_queue_set()); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2151 } |
1705 | 2152 |
2153 // Initialize the card queue set used to hold cards containing | |
2154 // references into the collection set. | |
2155 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2156 DirtyCardQ_FL_lock, | |
2157 -1, // never trigger processing | |
2158 -1, // no limit on length | |
2159 Shared_DirtyCardQ_lock, | |
2160 &JavaThread::dirty_card_queue_set()); | |
2161 | |
342 | 2162 // In case we're keeping closure specialization stats, initialize those |
2163 // counts and that mechanism. | |
2164 SpecializationStats::clear(); | |
2165 | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
2166 // Here we allocate the dummy full region that is required by the |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
2167 // G1AllocRegion class. If we don't pass an address in the reserved |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
2168 // space here, lots of asserts fire. |
3766 | 2169 |
2170 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2171 _g1_reserved.start()); | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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|
2172 // We'll re-use the same region whether the alloc region will |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
changeset
|
2173 // require BOT updates or not and, if it doesn't, then a non-young |
abdfc822206f
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tonyp
parents:
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diff
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|
2174 // region will complain that it cannot support allocations without |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
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|
2175 // BOT updates. So we'll tag the dummy region as young to avoid that. |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
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|
2176 dummy_region->set_young(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
2177 // Make sure it's full. |
abdfc822206f
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parents:
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|
2178 dummy_region->set_top(dummy_region->end()); |
abdfc822206f
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parents:
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diff
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|
2179 G1AllocRegion::setup(this, dummy_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2180 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2181 init_mutator_alloc_region(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2182 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
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|
2183 // Do create of the monitoring and management support so that |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2184 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
2185 _g1mm = new G1MonitoringSupport(this); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
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diff
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|
2186 |
342 | 2187 return JNI_OK; |
2188 } | |
2189 | |
12233
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12179
diff
changeset
|
2190 size_t G1CollectedHeap::conservative_max_heap_alignment() { |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12179
diff
changeset
|
2191 return HeapRegion::max_region_size(); |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12179
diff
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|
2192 } |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
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12179
diff
changeset
|
2193 |
342 | 2194 void G1CollectedHeap::ref_processing_init() { |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1973
diff
changeset
|
2195 // Reference processing in G1 currently works as follows: |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
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|
2196 // |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
2197 // * There are two reference processor instances. One is |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2198 // used to record and process discovered references |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2199 // during concurrent marking; the other is used to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2200 // record and process references during STW pauses |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2201 // (both full and incremental). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2202 // * Both ref processors need to 'span' the entire heap as |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2203 // the regions in the collection set may be dotted around. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2204 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2205 // * For the concurrent marking ref processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2206 // * Reference discovery is enabled at initial marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2207 // * Reference discovery is disabled and the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2208 // references processed etc during remarking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2209 // * Reference discovery is MT (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2210 // * Reference discovery requires a barrier (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2211 // * Reference processing may or may not be MT |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2212 // (depending on the value of ParallelRefProcEnabled |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2213 // and ParallelGCThreads). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2214 // * A full GC disables reference discovery by the CM |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2215 // ref processor and abandons any entries on it's |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2216 // discovered lists. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2217 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2218 // * For the STW processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2219 // * Non MT discovery is enabled at the start of a full GC. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2220 // * Processing and enqueueing during a full GC is non-MT. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2221 // * During a full GC, references are processed after marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2222 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2223 // * Discovery (may or may not be MT) is enabled at the start |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2224 // of an incremental evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2225 // * References are processed near the end of a STW evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2226 // * For both types of GC: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2227 // * Discovery is atomic - i.e. not concurrent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2228 // * Reference discovery will not need a barrier. |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
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|
2229 |
342 | 2230 SharedHeap::ref_processing_init(); |
2231 MemRegion mr = reserved_region(); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2232 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
2233 // Concurrent Mark ref processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2234 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2235 new ReferenceProcessor(mr, // span |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2236 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2237 // mt processing |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2238 (int) ParallelGCThreads, |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2239 // degree of mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2240 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2241 // mt discovery |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2242 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2243 // degree of mt discovery |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2244 false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2245 // Reference discovery is not atomic |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2246 &_is_alive_closure_cm, |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2247 // is alive closure |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2248 // (for efficiency/performance) |
4dfb2df418f2
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johnc
parents:
3973
diff
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|
2249 true); |
4dfb2df418f2
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3973
diff
changeset
|
2250 // Setting next fields of discovered |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2251 // lists requires a barrier. |
4dfb2df418f2
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3973
diff
changeset
|
2252 |
4dfb2df418f2
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3973
diff
changeset
|
2253 // STW ref processor |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2254 _ref_processor_stw = |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2255 new ReferenceProcessor(mr, // span |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2256 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2257 // mt processing |
4dfb2df418f2
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3973
diff
changeset
|
2258 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2259 // degree of mt processing |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2260 (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2261 // mt discovery |
4dfb2df418f2
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3973
diff
changeset
|
2262 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2263 // degree of mt discovery |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2264 true, |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2265 // Reference discovery is atomic |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2266 &_is_alive_closure_stw, |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2267 // is alive closure |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2268 // (for efficiency/performance) |
4dfb2df418f2
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3973
diff
changeset
|
2269 false); |
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diff
changeset
|
2270 // Setting next fields of discovered |
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diff
changeset
|
2271 // lists requires a barrier. |
342 | 2272 } |
2273 | |
2274 size_t G1CollectedHeap::capacity() const { | |
2275 return _g1_committed.byte_size(); | |
2276 } | |
2277 | |
6254
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tonyp
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6220
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|
2278 void G1CollectedHeap::reset_gc_time_stamps(HeapRegion* hr) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
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6220
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|
2279 assert(!hr->continuesHumongous(), "pre-condition"); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
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6220
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|
2280 hr->reset_gc_time_stamp(); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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2281 if (hr->startsHumongous()) { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2282 uint first_index = hr->hrs_index() + 1; |
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
2283 uint last_index = hr->last_hc_index(); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2284 for (uint i = first_index; i < last_index; i += 1) { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2285 HeapRegion* chr = region_at(i); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
2286 assert(chr->continuesHumongous(), "sanity"); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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6220
diff
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|
2287 chr->reset_gc_time_stamp(); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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6220
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|
2288 } |
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diff
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|
2289 } |
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diff
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|
2290 } |
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
2291 |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2292 #ifndef PRODUCT |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2293 class CheckGCTimeStampsHRClosure : public HeapRegionClosure { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2294 private: |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2295 unsigned _gc_time_stamp; |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2296 bool _failures; |
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|
2297 |
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
2298 public: |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2299 CheckGCTimeStampsHRClosure(unsigned gc_time_stamp) : |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2300 _gc_time_stamp(gc_time_stamp), _failures(false) { } |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2301 |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2302 virtual bool doHeapRegion(HeapRegion* hr) { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2303 unsigned region_gc_time_stamp = hr->get_gc_time_stamp(); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2304 if (_gc_time_stamp != region_gc_time_stamp) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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|
2305 gclog_or_tty->print_cr("Region "HR_FORMAT" has GC time stamp = %d, " |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
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6220
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|
2306 "expected %d", HR_FORMAT_PARAMS(hr), |
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7114678: G1: various small fixes, code cleanup, and refactoring
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6220
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|
2307 region_gc_time_stamp, _gc_time_stamp); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
2308 _failures = true; |
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
2309 } |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2310 return false; |
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
2311 } |
a2f7274eb6ef
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|
2312 |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2313 bool failures() { return _failures; } |
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7114678: G1: various small fixes, code cleanup, and refactoring
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6220
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|
2314 }; |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2315 |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2316 void G1CollectedHeap::check_gc_time_stamps() { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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6220
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|
2317 CheckGCTimeStampsHRClosure cl(_gc_time_stamp); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2318 heap_region_iterate(&cl); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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6220
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|
2319 guarantee(!cl.failures(), "all GC time stamps should have been reset"); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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6220
diff
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|
2320 } |
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7114678: G1: various small fixes, code cleanup, and refactoring
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6220
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|
2321 #endif // PRODUCT |
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7114678: G1: various small fixes, code cleanup, and refactoring
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6220
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|
2322 |
1705 | 2323 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2324 DirtyCardQueue* into_cset_dcq, | |
2325 bool concurrent, | |
342 | 2326 int worker_i) { |
889 | 2327 // Clean cards in the hot card cache |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
2328 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
2329 hot_card_cache->drain(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2330 |
342 | 2331 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2332 int n_completed_buffers = 0; | |
1705 | 2333 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2334 n_completed_buffers++; |
2335 } | |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2336 g1_policy()->phase_times()->record_update_rs_processed_buffers(worker_i, n_completed_buffers); |
342 | 2337 dcqs.clear_n_completed_buffers(); |
2338 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2339 } | |
2340 | |
2341 | |
2342 // Computes the sum of the storage used by the various regions. | |
2343 | |
2344 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2345 assert(Heap_lock->owner() != NULL, |
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2346 "Should be owned on this thread's behalf."); |
342 | 2347 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2348 // Read only once in case it is set to NULL concurrently |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2349 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
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|
2350 if (hr != NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
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|
2351 result += hr->used(); |
342 | 2352 return result; |
2353 } | |
2354 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2355 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2356 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2357 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2358 } |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2359 |
342 | 2360 class SumUsedClosure: public HeapRegionClosure { |
2361 size_t _used; | |
2362 public: | |
2363 SumUsedClosure() : _used(0) {} | |
2364 bool doHeapRegion(HeapRegion* r) { | |
2365 if (!r->continuesHumongous()) { | |
2366 _used += r->used(); | |
2367 } | |
2368 return false; | |
2369 } | |
2370 size_t result() { return _used; } | |
2371 }; | |
2372 | |
2373 size_t G1CollectedHeap::recalculate_used() const { | |
2374 SumUsedClosure blk; | |
3766 | 2375 heap_region_iterate(&blk); |
342 | 2376 return blk.result(); |
2377 } | |
2378 | |
2379 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2380 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2381 // otherwise, is there space in the current allocation region? |
2382 | |
2383 // We need to store the current allocation region in a local variable | |
2384 // here. The problem is that this method doesn't take any locks and | |
2385 // there may be other threads which overwrite the current allocation | |
2386 // region field. attempt_allocation(), for example, sets it to NULL | |
2387 // and this can happen *after* the NULL check here but before the call | |
2388 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2389 // to be a problem in the optimized build, since the two loads of the | |
2390 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
2391 HeapRegion* hr = _mutator_alloc_region.get(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
2392 if (hr == NULL) { |
342 | 2393 return 0; |
2394 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2395 return hr->free(); |
342 | 2396 } |
2397 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
2398 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2399 switch (cause) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2400 case GCCause::_gc_locker: return GCLockerInvokesConcurrent; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2401 case GCCause::_java_lang_system_gc: return ExplicitGCInvokesConcurrent; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2402 case GCCause::_g1_humongous_allocation: return true; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2403 default: return false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2404 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2405 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2406 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2407 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2408 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2409 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2410 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2411 // And as a result the region we'll allocate will be humongous. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2412 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2413 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2414 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2415 // Let's use the existing mechanism for the allocation |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2416 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2417 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2418 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2419 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2420 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2421 // If we can't allocate once, we probably cannot allocate |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2422 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2423 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2424 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2425 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2426 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2427 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2428 |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2429 void G1CollectedHeap::increment_old_marking_cycles_started() { |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2430 assert(_old_marking_cycles_started == _old_marking_cycles_completed || |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2431 _old_marking_cycles_started == _old_marking_cycles_completed + 1, |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2432 err_msg("Wrong marking cycle count (started: %d, completed: %d)", |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2433 _old_marking_cycles_started, _old_marking_cycles_completed)); |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2434 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2435 _old_marking_cycles_started++; |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2436 } |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2437 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2438 void G1CollectedHeap::increment_old_marking_cycles_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2439 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2440 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2441 // We assume that if concurrent == true, then the caller is a |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2442 // concurrent thread that was joined the Suspendible Thread |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2443 // Set. If there's ever a cheap way to check this, we should add an |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2444 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2445 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2446 // Given that this method is called at the end of a Full GC or of a |
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6944166: G1: explicit GCs are not always handled correctly
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|
2447 // concurrent cycle, and those can be nested (i.e., a Full GC can |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2448 // interrupt a concurrent cycle), the number of full collections |
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6944166: G1: explicit GCs are not always handled correctly
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|
2449 // completed should be either one (in the case where there was no |
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6944166: G1: explicit GCs are not always handled correctly
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|
2450 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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6944166: G1: explicit GCs are not always handled correctly
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|
2451 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2452 |
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|
2453 // This is the case for the inner caller, i.e. a Full GC. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2454 assert(concurrent || |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
2455 (_old_marking_cycles_started == _old_marking_cycles_completed + 1) || |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
2456 (_old_marking_cycles_started == _old_marking_cycles_completed + 2), |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
2457 err_msg("for inner caller (Full GC): _old_marking_cycles_started = %u " |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
2458 "is inconsistent with _old_marking_cycles_completed = %u", |
37552638d24a
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brutisso
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|
2459 _old_marking_cycles_started, _old_marking_cycles_completed)); |
1656
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tonyp
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|
2460 |
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6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2461 // This is the case for the outer caller, i.e. the concurrent cycle. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
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|
2462 assert(!concurrent || |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
2463 (_old_marking_cycles_started == _old_marking_cycles_completed + 1), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
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|
2464 err_msg("for outer caller (concurrent cycle): " |
6120
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brutisso
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|
2465 "_old_marking_cycles_started = %u " |
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7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
2466 "is inconsistent with _old_marking_cycles_completed = %u", |
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brutisso
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|
2467 _old_marking_cycles_started, _old_marking_cycles_completed)); |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
2468 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
2469 _old_marking_cycles_completed += 1; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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|
2470 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2471 // We need to clear the "in_progress" flag in the CM thread before |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2472 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
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diff
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|
2473 // is set) so that if a waiter requests another System.gc() it doesn't |
10405 | 2474 // incorrectly see that a marking cycle is still in progress. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2475 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
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1833
diff
changeset
|
2476 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
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1833
diff
changeset
|
2477 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
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diff
changeset
|
2478 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2479 // This notify_all() will ensure that a thread that called |
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6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2480 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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diff
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|
2481 // and it's waiting for a full GC to finish will be woken up. It is |
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diff
changeset
|
2482 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2483 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2484 } |
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changeset
|
2485 |
13400
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8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
13062
diff
changeset
|
2486 void G1CollectedHeap::register_concurrent_cycle_start(const Ticks& start_time) { |
10405 | 2487 _concurrent_cycle_started = true; |
2488 _gc_timer_cm->register_gc_start(start_time); | |
2489 | |
2490 _gc_tracer_cm->report_gc_start(gc_cause(), _gc_timer_cm->gc_start()); | |
2491 trace_heap_before_gc(_gc_tracer_cm); | |
2492 } | |
2493 | |
2494 void G1CollectedHeap::register_concurrent_cycle_end() { | |
2495 if (_concurrent_cycle_started) { | |
2496 if (_cm->has_aborted()) { | |
2497 _gc_tracer_cm->report_concurrent_mode_failure(); | |
2498 } | |
12179
f175e3678be2
8020692: TestGCEventMixed.java failed because of timestamp in event after end event
ehelin
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12116
diff
changeset
|
2499 |
13400
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mgronlun
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13062
diff
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|
2500 _gc_timer_cm->register_gc_end(); |
10405 | 2501 _gc_tracer_cm->report_gc_end(_gc_timer_cm->gc_end(), _gc_timer_cm->time_partitions()); |
2502 | |
2503 _concurrent_cycle_started = false; | |
2504 } | |
2505 } | |
2506 | |
2507 void G1CollectedHeap::trace_heap_after_concurrent_cycle() { | |
2508 if (_concurrent_cycle_started) { | |
2509 trace_heap_after_gc(_gc_tracer_cm); | |
2510 } | |
2511 } | |
2512 | |
2513 G1YCType G1CollectedHeap::yc_type() { | |
2514 bool is_young = g1_policy()->gcs_are_young(); | |
2515 bool is_initial_mark = g1_policy()->during_initial_mark_pause(); | |
2516 bool is_during_mark = mark_in_progress(); | |
2517 | |
2518 if (is_initial_mark) { | |
2519 return InitialMark; | |
2520 } else if (is_during_mark) { | |
2521 return DuringMark; | |
2522 } else if (is_young) { | |
2523 return Normal; | |
2524 } else { | |
2525 return Mixed; | |
2526 } | |
2527 } | |
2528 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
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1045
diff
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|
2529 void G1CollectedHeap::collect(GCCause::Cause cause) { |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
2530 assert_heap_not_locked(); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
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1045
diff
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|
2531 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2532 unsigned int gc_count_before; |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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6109
diff
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|
2533 unsigned int old_marking_count_before; |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
2534 bool retry_gc; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
2535 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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parents:
4875
diff
changeset
|
2536 do { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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parents:
4875
diff
changeset
|
2537 retry_gc = false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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parents:
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diff
changeset
|
2538 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
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4875
diff
changeset
|
2539 { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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parents:
4875
diff
changeset
|
2540 MutexLocker ml(Heap_lock); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2541 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
2542 // Read the GC count while holding the Heap_lock |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
2543 gc_count_before = total_collections(); |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2544 old_marking_count_before = _old_marking_cycles_started; |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2545 } |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2546 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2547 if (should_do_concurrent_full_gc(cause)) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2548 // Schedule an initial-mark evacuation pause that will start a |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2549 // concurrent cycle. We're setting word_size to 0 which means that |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2550 // we are not requesting a post-GC allocation. |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2551 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2552 0, /* word_size */ |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2553 true, /* should_initiate_conc_mark */ |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2554 g1_policy()->max_pause_time_ms(), |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2555 cause); |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2556 |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2557 VMThread::execute(&op); |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2558 if (!op.pause_succeeded()) { |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2559 if (old_marking_count_before == _old_marking_cycles_started) { |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2560 retry_gc = op.should_retry_gc(); |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2561 } else { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2562 // A Full GC happened while we were trying to schedule the |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2563 // initial-mark GC. No point in starting a new cycle given |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2564 // that the whole heap was collected anyway. |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2565 } |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2566 |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2567 if (retry_gc) { |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2568 if (GC_locker::is_active_and_needs_gc()) { |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2569 GC_locker::stall_until_clear(); |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2570 } |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2571 } |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2572 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2573 } else { |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2574 if (cause == GCCause::_gc_locker |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2575 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2576 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2577 // Schedule a standard evacuation pause. We're setting word_size |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2578 // to 0 which means that we are not requesting a post-GC allocation. |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2579 VM_G1IncCollectionPause op(gc_count_before, |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2580 0, /* word_size */ |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2581 false, /* should_initiate_conc_mark */ |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2582 g1_policy()->max_pause_time_ms(), |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2583 cause); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2584 VMThread::execute(&op); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2585 } else { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2586 // Schedule a Full GC. |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2587 VM_G1CollectFull op(gc_count_before, old_marking_count_before, cause); |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2588 VMThread::execute(&op); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2589 } |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2590 } |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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4875
diff
changeset
|
2591 } while (retry_gc); |
342 | 2592 } |
2593 | |
2594 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2595 if (_g1_committed.contains(p)) { |
2596 // Given that we know that p is in the committed space, | |
2597 // heap_region_containing_raw() should successfully | |
2598 // return the containing region. | |
2599 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2600 return hr->is_in(p); |
2601 } else { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2602 return false; |
342 | 2603 } |
2604 } | |
2605 | |
2606 // Iteration functions. | |
2607 | |
2608 // Iterates an OopClosure over all ref-containing fields of objects | |
2609 // within a HeapRegion. | |
2610 | |
2611 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2612 MemRegion _mr; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2613 ExtendedOopClosure* _cl; |
342 | 2614 public: |
6725
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6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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2615 IterateOopClosureRegionClosure(MemRegion mr, ExtendedOopClosure* cl) |
342 | 2616 : _mr(mr), _cl(cl) {} |
2617 bool doHeapRegion(HeapRegion* r) { | |
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2618 if (!r->continuesHumongous()) { |
342 | 2619 r->oop_iterate(_cl); |
2620 } | |
2621 return false; | |
2622 } | |
2623 }; | |
2624 | |
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2625 void G1CollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
342 | 2626 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2627 heap_region_iterate(&blk); |
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2628 } |
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2629 |
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2630 void G1CollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
342 | 2631 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2632 heap_region_iterate(&blk); |
342 | 2633 } |
2634 | |
2635 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2636 | |
2637 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2638 ObjectClosure* _cl; | |
2639 public: | |
2640 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2641 bool doHeapRegion(HeapRegion* r) { | |
2642 if (! r->continuesHumongous()) { | |
2643 r->object_iterate(_cl); | |
2644 } | |
2645 return false; | |
2646 } | |
2647 }; | |
2648 | |
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2649 void G1CollectedHeap::object_iterate(ObjectClosure* cl) { |
342 | 2650 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2651 heap_region_iterate(&blk); |
342 | 2652 } |
2653 | |
2654 // Calls a SpaceClosure on a HeapRegion. | |
2655 | |
2656 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2657 SpaceClosure* _cl; | |
2658 public: | |
2659 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2660 bool doHeapRegion(HeapRegion* r) { | |
2661 _cl->do_space(r); | |
2662 return false; | |
2663 } | |
2664 }; | |
2665 | |
2666 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2667 SpaceClosureRegionClosure blk(cl); | |
3766 | 2668 heap_region_iterate(&blk); |
342 | 2669 } |
2670 | |
3766 | 2671 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2672 _hrs.iterate(cl); | |
342 | 2673 } |
2674 | |
2675 void | |
2676 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
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2677 uint worker_id, |
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2678 uint no_of_par_workers, |
342 | 2679 jint claim_value) { |
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2680 const uint regions = n_regions(); |
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2681 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2682 no_of_par_workers : |
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2683 1); |
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2684 assert(UseDynamicNumberOfGCThreads || |
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2685 no_of_par_workers == workers()->total_workers(), |
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2686 "Non dynamic should use fixed number of workers"); |
355 | 2687 // try to spread out the starting points of the workers |
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2688 const HeapRegion* start_hr = |
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2689 start_region_for_worker(worker_id, no_of_par_workers); |
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2690 const uint start_index = start_hr->hrs_index(); |
355 | 2691 |
2692 // each worker will actually look at all regions | |
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2693 for (uint count = 0; count < regions; ++count) { |
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2694 const uint index = (start_index + count) % regions; |
355 | 2695 assert(0 <= index && index < regions, "sanity"); |
2696 HeapRegion* r = region_at(index); | |
2697 // we'll ignore "continues humongous" regions (we'll process them | |
2698 // when we come across their corresponding "start humongous" | |
2699 // region) and regions already claimed | |
2700 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2701 continue; | |
2702 } | |
2703 // OK, try to claim it | |
342 | 2704 if (r->claimHeapRegion(claim_value)) { |
355 | 2705 // success! |
2706 assert(!r->continuesHumongous(), "sanity"); | |
2707 if (r->startsHumongous()) { | |
2708 // If the region is "starts humongous" we'll iterate over its | |
2709 // "continues humongous" first; in fact we'll do them | |
2710 // first. The order is important. In on case, calling the | |
2711 // closure on the "starts humongous" region might de-allocate | |
2712 // and clear all its "continues humongous" regions and, as a | |
2713 // result, we might end up processing them twice. So, we'll do | |
2714 // them first (notice: most closures will ignore them anyway) and | |
2715 // then we'll do the "starts humongous" region. | |
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2716 for (uint ch_index = index + 1; ch_index < regions; ++ch_index) { |
355 | 2717 HeapRegion* chr = region_at(ch_index); |
2718 | |
2719 // if the region has already been claimed or it's not | |
2720 // "continues humongous" we're done | |
2721 if (chr->claim_value() == claim_value || | |
2722 !chr->continuesHumongous()) { | |
2723 break; | |
2724 } | |
2725 | |
10405 | 2726 // No one should have claimed it directly. We can given |
355 | 2727 // that we claimed its "starts humongous" region. |
2728 assert(chr->claim_value() != claim_value, "sanity"); | |
2729 assert(chr->humongous_start_region() == r, "sanity"); | |
2730 | |
2731 if (chr->claimHeapRegion(claim_value)) { | |
10405 | 2732 // we should always be able to claim it; no one else should |
355 | 2733 // be trying to claim this region |
2734 | |
2735 bool res2 = cl->doHeapRegion(chr); | |
2736 assert(!res2, "Should not abort"); | |
2737 | |
2738 // Right now, this holds (i.e., no closure that actually | |
2739 // does something with "continues humongous" regions | |
2740 // clears them). We might have to weaken it in the future, | |
2741 // but let's leave these two asserts here for extra safety. | |
2742 assert(chr->continuesHumongous(), "should still be the case"); | |
2743 assert(chr->humongous_start_region() == r, "sanity"); | |
2744 } else { | |
2745 guarantee(false, "we should not reach here"); | |
2746 } | |
2747 } | |
2748 } | |
2749 | |
2750 assert(!r->continuesHumongous(), "sanity"); | |
2751 bool res = cl->doHeapRegion(r); | |
2752 assert(!res, "Should not abort"); | |
2753 } | |
2754 } | |
2755 } | |
2756 | |
390 | 2757 class ResetClaimValuesClosure: public HeapRegionClosure { |
2758 public: | |
2759 bool doHeapRegion(HeapRegion* r) { | |
2760 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2761 return false; | |
2762 } | |
2763 }; | |
2764 | |
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2765 void G1CollectedHeap::reset_heap_region_claim_values() { |
390 | 2766 ResetClaimValuesClosure blk; |
2767 heap_region_iterate(&blk); | |
2768 } | |
2769 | |
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2770 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2771 ResetClaimValuesClosure blk; |
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2772 collection_set_iterate(&blk); |
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2773 } |
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2774 |
355 | 2775 #ifdef ASSERT |
2776 // This checks whether all regions in the heap have the correct claim | |
2777 // value. I also piggy-backed on this a check to ensure that the | |
2778 // humongous_start_region() information on "continues humongous" | |
2779 // regions is correct. | |
2780 | |
2781 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2782 private: | |
2783 jint _claim_value; | |
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2784 uint _failures; |
355 | 2785 HeapRegion* _sh_region; |
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2786 |
355 | 2787 public: |
2788 CheckClaimValuesClosure(jint claim_value) : | |
2789 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2790 bool doHeapRegion(HeapRegion* r) { | |
2791 if (r->claim_value() != _claim_value) { | |
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2792 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2793 "claim value = %d, should be %d", |
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2794 HR_FORMAT_PARAMS(r), |
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2795 r->claim_value(), _claim_value); |
355 | 2796 ++_failures; |
2797 } | |
2798 if (!r->isHumongous()) { | |
2799 _sh_region = NULL; | |
2800 } else if (r->startsHumongous()) { | |
2801 _sh_region = r; | |
2802 } else if (r->continuesHumongous()) { | |
2803 if (r->humongous_start_region() != _sh_region) { | |
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2804 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2805 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2806 HR_FORMAT_PARAMS(r), |
355 | 2807 r->humongous_start_region(), |
2808 _sh_region); | |
2809 ++_failures; | |
342 | 2810 } |
2811 } | |
355 | 2812 return false; |
2813 } | |
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2814 uint failures() { return _failures; } |
355 | 2815 }; |
2816 | |
2817 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2818 CheckClaimValuesClosure cl(claim_value); | |
2819 heap_region_iterate(&cl); | |
2820 return cl.failures() == 0; | |
2821 } | |
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2822 |
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2823 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2824 private: |
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|
2825 jint _claim_value; |
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2826 uint _failures; |
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2827 |
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2828 public: |
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|
2829 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2830 _claim_value(claim_value), _failures(0) { } |
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2831 |
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2832 uint failures() { return _failures; } |
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2833 |
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2834 bool doHeapRegion(HeapRegion* hr) { |
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2835 assert(hr->in_collection_set(), "how?"); |
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2836 assert(!hr->isHumongous(), "H-region in CSet"); |
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2837 if (hr->claim_value() != _claim_value) { |
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2838 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2839 "claim value = %d, should be %d", |
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2840 HR_FORMAT_PARAMS(hr), |
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2841 hr->claim_value(), _claim_value); |
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2842 _failures += 1; |
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|
2843 } |
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2844 return false; |
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|
2845 } |
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2846 }; |
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2847 |
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2848 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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2849 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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2850 collection_set_iterate(&cl); |
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2851 return cl.failures() == 0; |
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2852 } |
355 | 2853 #endif // ASSERT |
342 | 2854 |
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2855 // Clear the cached CSet starting regions and (more importantly) |
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2856 // the time stamps. Called when we reset the GC time stamp. |
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2857 void G1CollectedHeap::clear_cset_start_regions() { |
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2858 assert(_worker_cset_start_region != NULL, "sanity"); |
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2859 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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2860 |
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2861 int n_queues = MAX2((int)ParallelGCThreads, 1); |
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2862 for (int i = 0; i < n_queues; i++) { |
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2863 _worker_cset_start_region[i] = NULL; |
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2864 _worker_cset_start_region_time_stamp[i] = 0; |
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2865 } |
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|
2866 } |
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2867 |
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2868 // Given the id of a worker, obtain or calculate a suitable |
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2869 // starting region for iterating over the current collection set. |
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|
2870 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2871 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2872 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2873 HeapRegion* result = NULL; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2874 unsigned gc_time_stamp = get_gc_time_stamp(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2875 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2876 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2877 // Cached starting region for current worker was set |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2878 // during the current pause - so it's valid. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2879 // Note: the cached starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2880 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2881 result = _worker_cset_start_region[worker_i]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2882 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2883 return result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2884 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2885 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2886 // The cached entry was not valid so let's calculate |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2887 // a suitable starting heap region for this worker. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2888 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2889 // We want the parallel threads to start their collection |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2890 // set iteration at different collection set regions to |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2891 // avoid contention. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2892 // If we have: |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2893 // n collection set regions |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2894 // p threads |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2895 // Then thread t will start at region floor ((t * n) / p) |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2896 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2897 result = g1_policy()->collection_set(); |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2898 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2899 uint cs_size = g1_policy()->cset_region_length(); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2900 uint active_workers = workers()->active_workers(); |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2901 assert(UseDynamicNumberOfGCThreads || |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2902 active_workers == workers()->total_workers(), |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2903 "Unless dynamic should use total workers"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2904 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2905 uint end_ind = (cs_size * worker_i) / active_workers; |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2906 uint start_ind = 0; |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2907 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2908 if (worker_i > 0 && |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2909 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2910 // Previous workers starting region is valid |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2911 // so let's iterate from there |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2912 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2913 result = _worker_cset_start_region[worker_i - 1]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2914 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2915 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2916 for (uint i = start_ind; i < end_ind; i++) { |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2917 result = result->next_in_collection_set(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2918 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2919 } |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2920 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2921 // Note: the calculated starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2922 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2923 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2924 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2925 "should be updated only once per pause"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2926 _worker_cset_start_region[worker_i] = result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2927 OrderAccess::storestore(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2928 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2929 return result; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2930 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2931 |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2932 HeapRegion* G1CollectedHeap::start_region_for_worker(uint worker_i, |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2933 uint no_of_par_workers) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2934 uint worker_num = |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2935 G1CollectedHeap::use_parallel_gc_threads() ? no_of_par_workers : 1U; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2936 assert(UseDynamicNumberOfGCThreads || |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2937 no_of_par_workers == workers()->total_workers(), |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2938 "Non dynamic should use fixed number of workers"); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2939 const uint start_index = n_regions() * worker_i / worker_num; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2940 return region_at(start_index); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2941 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2942 |
342 | 2943 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2944 HeapRegion* r = g1_policy()->collection_set(); | |
2945 while (r != NULL) { | |
2946 HeapRegion* next = r->next_in_collection_set(); | |
2947 if (cl->doHeapRegion(r)) { | |
2948 cl->incomplete(); | |
2949 return; | |
2950 } | |
2951 r = next; | |
2952 } | |
2953 } | |
2954 | |
2955 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2956 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2957 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2958 // The CSet is empty so there's nothing to do. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2959 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2960 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2961 |
342 | 2962 assert(r->in_collection_set(), |
2963 "Start region must be a member of the collection set."); | |
2964 HeapRegion* cur = r; | |
2965 while (cur != NULL) { | |
2966 HeapRegion* next = cur->next_in_collection_set(); | |
2967 if (cl->doHeapRegion(cur) && false) { | |
2968 cl->incomplete(); | |
2969 return; | |
2970 } | |
2971 cur = next; | |
2972 } | |
2973 cur = g1_policy()->collection_set(); | |
2974 while (cur != r) { | |
2975 HeapRegion* next = cur->next_in_collection_set(); | |
2976 if (cl->doHeapRegion(cur) && false) { | |
2977 cl->incomplete(); | |
2978 return; | |
2979 } | |
2980 cur = next; | |
2981 } | |
2982 } | |
2983 | |
2984 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2985 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2986 } |
2987 | |
2988 | |
2989 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2990 Space* res = heap_region_containing(addr); | |
2991 return res; | |
2992 } | |
2993 | |
2994 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2995 Space* sp = space_containing(addr); | |
2996 if (sp != NULL) { | |
2997 return sp->block_start(addr); | |
2998 } | |
2999 return NULL; | |
3000 } | |
3001 | |
3002 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
3003 Space* sp = space_containing(addr); | |
3004 assert(sp != NULL, "block_size of address outside of heap"); | |
3005 return sp->block_size(addr); | |
3006 } | |
3007 | |
3008 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
3009 Space* sp = space_containing(addr); | |
3010 return sp->block_is_obj(addr); | |
3011 } | |
3012 | |
3013 bool G1CollectedHeap::supports_tlab_allocation() const { | |
3014 return true; | |
3015 } | |
3016 | |
3017 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
3018 return HeapRegion::GrainBytes; | |
3019 } | |
3020 | |
3021 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
3022 // Return the remaining space in the cur alloc region, but not less than | |
3023 // the min TLAB size. | |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3024 |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3025 // Also, this value can be at most the humongous object threshold, |
10405 | 3026 // since we can't allow tlabs to grow big enough to accommodate |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3027 // humongous objects. |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3028 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3029 HeapRegion* hr = _mutator_alloc_region.get(); |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3030 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3031 if (hr == NULL) { |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3032 return max_tlab_size; |
342 | 3033 } else { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3034 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 3035 } |
3036 } | |
3037 | |
3038 size_t G1CollectedHeap::max_capacity() const { | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3039 return _g1_reserved.byte_size(); |
342 | 3040 } |
3041 | |
3042 jlong G1CollectedHeap::millis_since_last_gc() { | |
3043 // assert(false, "NYI"); | |
3044 return 0; | |
3045 } | |
3046 | |
3047 void G1CollectedHeap::prepare_for_verify() { | |
3048 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
3049 ensure_parsability(false); | |
3050 } | |
3051 g1_rem_set()->prepare_for_verify(); | |
3052 } | |
3053 | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
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|
3054 bool G1CollectedHeap::allocated_since_marking(oop obj, HeapRegion* hr, |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3055 VerifyOption vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3056 switch (vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3057 case VerifyOption_G1UsePrevMarking: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3058 return hr->obj_allocated_since_prev_marking(obj); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3059 case VerifyOption_G1UseNextMarking: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3060 return hr->obj_allocated_since_next_marking(obj); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3061 case VerifyOption_G1UseMarkWord: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3062 return false; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3063 default: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3064 ShouldNotReachHere(); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3065 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3066 return false; // keep some compilers happy |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3067 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
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3068 |
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3069 HeapWord* G1CollectedHeap::top_at_mark_start(HeapRegion* hr, VerifyOption vo) { |
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3070 switch (vo) { |
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3071 case VerifyOption_G1UsePrevMarking: return hr->prev_top_at_mark_start(); |
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3072 case VerifyOption_G1UseNextMarking: return hr->next_top_at_mark_start(); |
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3073 case VerifyOption_G1UseMarkWord: return NULL; |
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3074 default: ShouldNotReachHere(); |
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3075 } |
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3076 return NULL; // keep some compilers happy |
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3077 } |
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3078 |
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3079 bool G1CollectedHeap::is_marked(oop obj, VerifyOption vo) { |
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3080 switch (vo) { |
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3081 case VerifyOption_G1UsePrevMarking: return isMarkedPrev(obj); |
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3082 case VerifyOption_G1UseNextMarking: return isMarkedNext(obj); |
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3083 case VerifyOption_G1UseMarkWord: return obj->is_gc_marked(); |
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3084 default: ShouldNotReachHere(); |
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3085 } |
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3086 return false; // keep some compilers happy |
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3087 } |
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3088 |
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3089 const char* G1CollectedHeap::top_at_mark_start_str(VerifyOption vo) { |
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3090 switch (vo) { |
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3091 case VerifyOption_G1UsePrevMarking: return "PTAMS"; |
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3092 case VerifyOption_G1UseNextMarking: return "NTAMS"; |
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3093 case VerifyOption_G1UseMarkWord: return "NONE"; |
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3094 default: ShouldNotReachHere(); |
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3095 } |
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3096 return NULL; // keep some compilers happy |
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3097 } |
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3098 |
12080 | 3099 // TODO: VerifyRootsClosure extends OopsInGenClosure so that we can |
3100 // pass it as the perm_blk to SharedHeap::process_strong_roots. | |
3101 // When process_strong_roots stop calling perm_blk->younger_refs_iterate | |
3102 // we can change this closure to extend the simpler OopClosure. | |
3103 class VerifyRootsClosure: public OopsInGenClosure { | |
3104 private: | |
3105 G1CollectedHeap* _g1h; | |
3106 VerifyOption _vo; | |
3107 bool _failures; | |
3108 public: | |
3109 // _vo == UsePrevMarking -> use "prev" marking information, | |
3110 // _vo == UseNextMarking -> use "next" marking information, | |
3111 // _vo == UseMarkWord -> use mark word from object header. | |
3112 VerifyRootsClosure(VerifyOption vo) : | |
3113 _g1h(G1CollectedHeap::heap()), | |
3114 _vo(vo), | |
3115 _failures(false) { } | |
3116 | |
3117 bool failures() { return _failures; } | |
3118 | |
3119 template <class T> void do_oop_nv(T* p) { | |
3120 T heap_oop = oopDesc::load_heap_oop(p); | |
3121 if (!oopDesc::is_null(heap_oop)) { | |
3122 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
3123 if (_g1h->is_obj_dead_cond(obj, _vo)) { | |
3124 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " | |
3125 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
3126 if (_vo == VerifyOption_G1UseMarkWord) { | |
3127 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); | |
3128 } | |
3129 obj->print_on(gclog_or_tty); | |
3130 _failures = true; | |
3131 } | |
3132 } | |
3133 } | |
3134 | |
3135 void do_oop(oop* p) { do_oop_nv(p); } | |
3136 void do_oop(narrowOop* p) { do_oop_nv(p); } | |
3137 }; | |
3138 | |
3139 class G1VerifyCodeRootOopClosure: public OopsInGenClosure { | |
3140 G1CollectedHeap* _g1h; | |
3141 OopClosure* _root_cl; | |
3142 nmethod* _nm; | |
3143 VerifyOption _vo; | |
3144 bool _failures; | |
3145 | |
3146 template <class T> void do_oop_work(T* p) { | |
3147 // First verify that this root is live | |
3148 _root_cl->do_oop(p); | |
3149 | |
3150 if (!G1VerifyHeapRegionCodeRoots) { | |
3151 // We're not verifying the code roots attached to heap region. | |
3152 return; | |
3153 } | |
3154 | |
3155 // Don't check the code roots during marking verification in a full GC | |
3156 if (_vo == VerifyOption_G1UseMarkWord) { | |
3157 return; | |
3158 } | |
3159 | |
3160 // Now verify that the current nmethod (which contains p) is | |
3161 // in the code root list of the heap region containing the | |
3162 // object referenced by p. | |
3163 | |
3164 T heap_oop = oopDesc::load_heap_oop(p); | |
3165 if (!oopDesc::is_null(heap_oop)) { | |
3166 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
3167 | |
3168 // Now fetch the region containing the object | |
3169 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
3170 HeapRegionRemSet* hrrs = hr->rem_set(); | |
3171 // Verify that the strong code root list for this region | |
3172 // contains the nmethod | |
3173 if (!hrrs->strong_code_roots_list_contains(_nm)) { | |
3174 gclog_or_tty->print_cr("Code root location "PTR_FORMAT" " | |
3175 "from nmethod "PTR_FORMAT" not in strong " | |
3176 "code roots for region ["PTR_FORMAT","PTR_FORMAT")", | |
3177 p, _nm, hr->bottom(), hr->end()); | |
3178 _failures = true; | |
3179 } | |
3180 } | |
3181 } | |
3182 | |
3183 public: | |
3184 G1VerifyCodeRootOopClosure(G1CollectedHeap* g1h, OopClosure* root_cl, VerifyOption vo): | |
3185 _g1h(g1h), _root_cl(root_cl), _vo(vo), _nm(NULL), _failures(false) {} | |
3186 | |
3187 void do_oop(oop* p) { do_oop_work(p); } | |
3188 void do_oop(narrowOop* p) { do_oop_work(p); } | |
3189 | |
3190 void set_nmethod(nmethod* nm) { _nm = nm; } | |
3191 bool failures() { return _failures; } | |
3192 }; | |
3193 | |
3194 class G1VerifyCodeRootBlobClosure: public CodeBlobClosure { | |
3195 G1VerifyCodeRootOopClosure* _oop_cl; | |
3196 | |
3197 public: | |
3198 G1VerifyCodeRootBlobClosure(G1VerifyCodeRootOopClosure* oop_cl): | |
3199 _oop_cl(oop_cl) {} | |
3200 | |
3201 void do_code_blob(CodeBlob* cb) { | |
3202 nmethod* nm = cb->as_nmethod_or_null(); | |
3203 if (nm != NULL) { | |
3204 _oop_cl->set_nmethod(nm); | |
3205 nm->oops_do(_oop_cl); | |
3206 } | |
3207 } | |
3208 }; | |
3209 | |
3210 class YoungRefCounterClosure : public OopClosure { | |
3211 G1CollectedHeap* _g1h; | |
3212 int _count; | |
3213 public: | |
3214 YoungRefCounterClosure(G1CollectedHeap* g1h) : _g1h(g1h), _count(0) {} | |
3215 void do_oop(oop* p) { if (_g1h->is_in_young(*p)) { _count++; } } | |
3216 void do_oop(narrowOop* p) { ShouldNotReachHere(); } | |
3217 | |
3218 int count() { return _count; } | |
3219 void reset_count() { _count = 0; }; | |
3220 }; | |
3221 | |
3222 class VerifyKlassClosure: public KlassClosure { | |
3223 YoungRefCounterClosure _young_ref_counter_closure; | |
3224 OopClosure *_oop_closure; | |
3225 public: | |
3226 VerifyKlassClosure(G1CollectedHeap* g1h, OopClosure* cl) : _young_ref_counter_closure(g1h), _oop_closure(cl) {} | |
3227 void do_klass(Klass* k) { | |
3228 k->oops_do(_oop_closure); | |
3229 | |
3230 _young_ref_counter_closure.reset_count(); | |
3231 k->oops_do(&_young_ref_counter_closure); | |
3232 if (_young_ref_counter_closure.count() > 0) { | |
3233 guarantee(k->has_modified_oops(), err_msg("Klass %p, has young refs but is not dirty.", k)); | |
3234 } | |
3235 } | |
3236 }; | |
3237 | |
342 | 3238 class VerifyLivenessOopClosure: public OopClosure { |
3772
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3239 G1CollectedHeap* _g1h; |
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3240 VerifyOption _vo; |
342 | 3241 public: |
3772
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3242 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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3243 _g1h(g1h), _vo(vo) |
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3244 { } |
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3245 void do_oop(narrowOop *p) { do_oop_work(p); } |
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3246 void do_oop( oop *p) { do_oop_work(p); } |
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3247 |
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3248 template <class T> void do_oop_work(T *p) { |
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3249 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
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3250 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
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3251 "Dead object referenced by a not dead object"); |
342 | 3252 } |
3253 }; | |
3254 | |
3255 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 3256 private: |
342 | 3257 G1CollectedHeap* _g1h; |
3258 size_t _live_bytes; | |
3259 HeapRegion *_hr; | |
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3260 VerifyOption _vo; |
342 | 3261 public: |
3772
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3262 // _vo == UsePrevMarking -> use "prev" marking information, |
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3263 // _vo == UseNextMarking -> use "next" marking information, |
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3264 // _vo == UseMarkWord -> use mark word from object header. |
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3265 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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3266 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 3267 _g1h = G1CollectedHeap::heap(); |
3268 } | |
3269 void do_object(oop o) { | |
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3270 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 3271 assert(o != NULL, "Huh?"); |
3772
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3272 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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3273 // If the object is alive according to the mark word, |
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3274 // then verify that the marking information agrees. |
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3275 // Note we can't verify the contra-positive of the |
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3276 // above: if the object is dead (according to the mark |
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3277 // word), it may not be marked, or may have been marked |
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3278 // but has since became dead, or may have been allocated |
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3279 // since the last marking. |
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3280 if (_vo == VerifyOption_G1UseMarkWord) { |
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3281 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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3282 } |
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3283 |
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3284 o->oop_iterate_no_header(&isLive); |
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3285 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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3286 size_t obj_size = o->size(); // Make sure we don't overflow |
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3287 _live_bytes += (obj_size * HeapWordSize); |
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3288 } |
342 | 3289 } |
3290 } | |
3291 size_t live_bytes() { return _live_bytes; } | |
3292 }; | |
3293 | |
3294 class PrintObjsInRegionClosure : public ObjectClosure { | |
3295 HeapRegion *_hr; | |
3296 G1CollectedHeap *_g1; | |
3297 public: | |
3298 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
3299 _g1 = G1CollectedHeap::heap(); | |
3300 }; | |
3301 | |
3302 void do_object(oop o) { | |
3303 if (o != NULL) { | |
3304 HeapWord *start = (HeapWord *) o; | |
3305 size_t word_sz = o->size(); | |
3306 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
3307 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
3308 (void*) o, word_sz, | |
3309 _g1->isMarkedPrev(o), | |
3310 _g1->isMarkedNext(o), | |
3311 _hr->obj_allocated_since_prev_marking(o)); | |
3312 HeapWord *end = start + word_sz; | |
3313 HeapWord *cur; | |
3314 int *val; | |
3315 for (cur = start; cur < end; cur++) { | |
3316 val = (int *) cur; | |
3317 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
3318 } | |
3319 } | |
3320 } | |
3321 }; | |
3322 | |
3323 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 3324 private: |
6254
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3325 bool _par; |
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3326 VerifyOption _vo; |
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3327 bool _failures; |
811 | 3328 public: |
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3329 // _vo == UsePrevMarking -> use "prev" marking information, |
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3330 // _vo == UseNextMarking -> use "next" marking information, |
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3331 // _vo == UseMarkWord -> use mark word from object header. |
6008 | 3332 VerifyRegionClosure(bool par, VerifyOption vo) |
3333 : _par(par), | |
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3334 _vo(vo), |
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3335 _failures(false) {} |
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3336 |
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|
3337 bool failures() { |
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3338 return _failures; |
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|
3339 } |
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|
3340 |
342 | 3341 bool doHeapRegion(HeapRegion* r) { |
637
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3342 if (!r->continuesHumongous()) { |
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|
3343 bool failures = false; |
6008 | 3344 r->verify(_vo, &failures); |
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|
3345 if (failures) { |
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|
3346 _failures = true; |
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|
3347 } else { |
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|
3348 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
1020
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3349 r->object_iterate(¬_dead_yet_cl); |
4787
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|
3350 if (_vo != VerifyOption_G1UseNextMarking) { |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3351 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
2ace1c4ee8da
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|
3352 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3353 "max_live_bytes "SIZE_FORMAT" " |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3354 "< calculated "SIZE_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3355 r->bottom(), r->end(), |
2ace1c4ee8da
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|
3356 r->max_live_bytes(), |
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|
3357 not_dead_yet_cl.live_bytes()); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3358 _failures = true; |
2ace1c4ee8da
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diff
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|
3359 } |
2ace1c4ee8da
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|
3360 } else { |
2ace1c4ee8da
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|
3361 // When vo == UseNextMarking we cannot currently do a sanity |
2ace1c4ee8da
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|
3362 // check on the live bytes as the calculation has not been |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3363 // finalized yet. |
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|
3364 } |
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|
3365 } |
342 | 3366 } |
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|
3367 return false; // stop the region iteration if we hit a failure |
342 | 3368 } |
3369 }; | |
3370 | |
12080 | 3371 // This is the task used for parallel verification of the heap regions |
390 | 3372 |
3373 class G1ParVerifyTask: public AbstractGangTask { | |
3374 private: | |
3375 G1CollectedHeap* _g1h; | |
3772
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3376 VerifyOption _vo; |
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|
3377 bool _failures; |
390 | 3378 |
3379 public: | |
3772
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|
3380 // _vo == UsePrevMarking -> use "prev" marking information, |
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|
3381 // _vo == UseNextMarking -> use "next" marking information, |
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|
3382 // _vo == UseMarkWord -> use mark word from object header. |
6008 | 3383 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) : |
390 | 3384 AbstractGangTask("Parallel verify task"), |
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|
3385 _g1h(g1h), |
3772
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|
3386 _vo(vo), |
1020
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|
3387 _failures(false) { } |
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|
3388 |
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|
3389 bool failures() { |
ff2402f6a50b
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|
3390 return _failures; |
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|
3391 } |
390 | 3392 |
4728
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7121618: Change type of number of GC workers to unsigned int.
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diff
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|
3393 void work(uint worker_id) { |
637
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|
3394 HandleMark hm; |
6008 | 3395 VerifyRegionClosure blk(true, _vo); |
4728
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|
3396 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
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|
3397 _g1h->workers()->active_workers(), |
390 | 3398 HeapRegion::ParVerifyClaimValue); |
1020
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|
3399 if (blk.failures()) { |
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parents:
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|
3400 _failures = true; |
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diff
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|
3401 } |
390 | 3402 } |
3403 }; | |
3404 | |
12080 | 3405 void G1CollectedHeap::verify(bool silent, VerifyOption vo) { |
8855
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8010463: G1: Crashes with -UseTLAB and heap verification
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diff
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|
3406 if (SafepointSynchronize::is_at_safepoint()) { |
12080 | 3407 assert(Thread::current()->is_VM_thread(), |
3408 "Expected to be executed serially by the VM thread at this point"); | |
3409 | |
6725
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|
3410 if (!silent) { gclog_or_tty->print("Roots "); } |
3772
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|
3411 VerifyRootsClosure rootsCl(vo); |
12080 | 3412 G1VerifyCodeRootOopClosure codeRootsCl(this, &rootsCl, vo); |
3413 G1VerifyCodeRootBlobClosure blobsCl(&codeRootsCl); | |
6725
da91efe96a93
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|
3414 VerifyKlassClosure klassCl(this, &rootsCl); |
3772
6747fd0512e0
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diff
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|
3415 |
3293
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
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|
3416 // We apply the relevant closures to all the oops in the |
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
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|
3417 // system dictionary, the string table and the code cache. |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
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diff
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|
3418 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
3772
6747fd0512e0
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|
3419 |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3420 // Need cleared claim bits for the strong roots processing |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
3421 ClassLoaderDataGraph::clear_claimed_marks(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
3422 |
3293
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diff
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|
3423 process_strong_roots(true, // activate StrongRootsScope |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
3424 false, // we set "is scavenging" to false, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
3425 // so we don't reset the dirty cards. |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
3426 ScanningOption(so), // roots scanning options |
342 | 3427 &rootsCl, |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
3428 &blobsCl, |
6725
da91efe96a93
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coleenp
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6629
diff
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|
3429 &klassCl |
da91efe96a93
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diff
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|
3430 ); |
da91efe96a93
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diff
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|
3431 |
12080 | 3432 bool failures = rootsCl.failures() || codeRootsCl.failures(); |
3772
6747fd0512e0
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|
3433 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
3434 if (vo != VerifyOption_G1UseMarkWord) { |
6747fd0512e0
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diff
changeset
|
3435 // If we're verifying during a full GC then the region sets |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
3436 // will have been torn down at the start of the GC. Therefore |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
3437 // verifying the region sets will fail. So we only verify |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3438 // the region sets when not in a full GC. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3439 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3440 verify_region_sets(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3441 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
3442 |
2152 | 3443 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3444 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3445 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3446 "sanity check"); | |
3447 | |
6008 | 3448 G1ParVerifyTask task(this, vo); |
4095
bca17e38de00
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diff
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|
3449 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
3450 workers()->active_workers() == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
3451 "If not dynamic should be using all the workers"); |
bca17e38de00
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diff
changeset
|
3452 int n_workers = workers()->active_workers(); |
390 | 3453 set_par_threads(n_workers); |
3454 workers()->run_task(&task); | |
3455 set_par_threads(0); | |
1020
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diff
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|
3456 if (task.failures()) { |
ff2402f6a50b
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parents:
1019
diff
changeset
|
3457 failures = true; |
ff2402f6a50b
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1019
diff
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|
3458 } |
390 | 3459 |
4095
bca17e38de00
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diff
changeset
|
3460 // Checks that the expected amount of parallel work was done. |
bca17e38de00
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4090
diff
changeset
|
3461 // The implication is that n_workers is > 0. |
390 | 3462 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3463 "sanity check"); | |
3464 | |
3465 reset_heap_region_claim_values(); | |
3466 | |
3467 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3468 "sanity check"); | |
3469 } else { | |
6008 | 3470 VerifyRegionClosure blk(false, vo); |
3766 | 3471 heap_region_iterate(&blk); |
1020
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1019
diff
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|
3472 if (blk.failures()) { |
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1019
diff
changeset
|
3473 failures = true; |
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diff
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|
3474 } |
390 | 3475 } |
2152 | 3476 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3477 rem_set()->verify(); |
1020
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|
3478 |
ff2402f6a50b
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1019
diff
changeset
|
3479 if (failures) { |
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1019
diff
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|
3480 gclog_or_tty->print_cr("Heap:"); |
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3481 // It helps to have the per-region information in the output to |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3482 // help us track down what went wrong. This is why we call |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3483 // print_extended_on() instead of print_on(). |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3484 print_extended_on(gclog_or_tty); |
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|
3485 gclog_or_tty->print_cr(""); |
1547
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jcoomes
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1545
diff
changeset
|
3486 #ifndef PRODUCT |
1044 | 3487 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3488 concurrent_mark()->print_reachable("at-verification-failure", |
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|
3489 vo, false /* all */); |
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diff
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|
3490 } |
1547
fb1a39993f69
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1545
diff
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|
3491 #endif |
1020
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1019
diff
changeset
|
3492 gclog_or_tty->flush(); |
ff2402f6a50b
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1019
diff
changeset
|
3493 } |
ff2402f6a50b
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diff
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|
3494 guarantee(!failures, "there should not have been any failures"); |
342 | 3495 } else { |
8855
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8010463: G1: Crashes with -UseTLAB and heap verification
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diff
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|
3496 if (!silent) |
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diff
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|
3497 gclog_or_tty->print("(SKIPPING roots, heapRegionSets, heapRegions, remset) "); |
342 | 3498 } |
3499 } | |
3500 | |
12080 | 3501 void G1CollectedHeap::verify(bool silent) { |
3502 verify(silent, VerifyOption_G1UsePrevMarking); | |
3503 } | |
3504 | |
3505 double G1CollectedHeap::verify(bool guard, const char* msg) { | |
3506 double verify_time_ms = 0.0; | |
3507 | |
3508 if (guard && total_collections() >= VerifyGCStartAt) { | |
3509 double verify_start = os::elapsedTime(); | |
3510 HandleMark hm; // Discard invalid handles created during verification | |
3511 prepare_for_verify(); | |
3512 Universe::verify(VerifyOption_G1UsePrevMarking, msg); | |
3513 verify_time_ms = (os::elapsedTime() - verify_start) * 1000; | |
3514 } | |
3515 | |
3516 return verify_time_ms; | |
3517 } | |
3518 | |
3519 void G1CollectedHeap::verify_before_gc() { | |
3520 double verify_time_ms = verify(VerifyBeforeGC, " VerifyBeforeGC:"); | |
3521 g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms); | |
3522 } | |
3523 | |
3524 void G1CollectedHeap::verify_after_gc() { | |
3525 double verify_time_ms = verify(VerifyAfterGC, " VerifyAfterGC:"); | |
3526 g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms); | |
3527 } | |
3528 | |
342 | 3529 class PrintRegionClosure: public HeapRegionClosure { |
3530 outputStream* _st; | |
3531 public: | |
3532 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3533 bool doHeapRegion(HeapRegion* r) { | |
3534 r->print_on(_st); | |
3535 return false; | |
3536 } | |
3537 }; | |
3538 | |
3539 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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|
3540 st->print(" %-20s", "garbage-first heap"); |
0316eac49d5a
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|
3541 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
3542 capacity()/K, used_unlocked()/K); |
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
3543 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
0316eac49d5a
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|
3544 _g1_storage.low_boundary(), |
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3545 _g1_storage.high(), |
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3546 _g1_storage.high_boundary()); |
0316eac49d5a
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diff
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|
3547 st->cr(); |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
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|
3548 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
6010
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|
3549 uint young_regions = _young_list->length(); |
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|
3550 st->print("%u young (" SIZE_FORMAT "K), ", young_regions, |
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|
3551 (size_t) young_regions * HeapRegion::GrainBytes / K); |
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3552 uint survivor_regions = g1_policy()->recorded_survivor_regions(); |
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|
3553 st->print("%u survivors (" SIZE_FORMAT "K)", survivor_regions, |
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|
3554 (size_t) survivor_regions * HeapRegion::GrainBytes / K); |
838
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|
3555 st->cr(); |
6863
04155d9c8c76
8000358: G1: metaspace information not printed in PrintHeapAtGC output nor in hs_err file
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|
3556 MetaspaceAux::print_on(st); |
4073
53074c2c4600
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|
3557 } |
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|
3558 |
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|
3559 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3560 print_on(st); |
53074c2c4600
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|
3561 |
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|
3562 // Print the per-region information. |
53074c2c4600
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|
3563 st->cr(); |
6010
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|
3564 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), " |
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|
3565 "HS=humongous(starts), HC=humongous(continues), " |
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|
3566 "CS=collection set, F=free, TS=gc time stamp, " |
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|
3567 "PTAMS=previous top-at-mark-start, " |
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|
3568 "NTAMS=next top-at-mark-start)"); |
342 | 3569 PrintRegionClosure blk(st); |
3766 | 3570 heap_region_iterate(&blk); |
342 | 3571 } |
3572 | |
9076
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8011872: Include Bit Map addresses in the hs_err files
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8855
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|
3573 void G1CollectedHeap::print_on_error(outputStream* st) const { |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
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changeset
|
3574 this->CollectedHeap::print_on_error(st); |
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8011872: Include Bit Map addresses in the hs_err files
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changeset
|
3575 |
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8011872: Include Bit Map addresses in the hs_err files
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diff
changeset
|
3576 if (_cm != NULL) { |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
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diff
changeset
|
3577 st->cr(); |
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|
3578 _cm->print_on_error(st); |
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changeset
|
3579 } |
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diff
changeset
|
3580 } |
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diff
changeset
|
3581 |
342 | 3582 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3583 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3584 workers()->print_worker_threads_on(st); |
3585 } | |
3586 _cmThread->print_on(st); | |
342 | 3587 st->cr(); |
1019 | 3588 _cm->print_worker_threads_on(st); |
3589 _cg1r->print_worker_threads_on(st); | |
342 | 3590 } |
3591 | |
3592 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1833
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jmasa
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|
3593 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3594 workers()->threads_do(tc); |
3595 } | |
3596 tc->do_thread(_cmThread); | |
794 | 3597 _cg1r->threads_do(tc); |
342 | 3598 } |
3599 | |
3600 void G1CollectedHeap::print_tracing_info() const { | |
3601 // We'll overload this to mean "trace GC pause statistics." | |
3602 if (TraceGen0Time || TraceGen1Time) { | |
3603 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3604 // to that. | |
3605 g1_policy()->print_tracing_info(); | |
3606 } | |
751 | 3607 if (G1SummarizeRSetStats) { |
342 | 3608 g1_rem_set()->print_summary_info(); |
3609 } | |
1282 | 3610 if (G1SummarizeConcMark) { |
342 | 3611 concurrent_mark()->print_summary_info(); |
3612 } | |
3613 g1_policy()->print_yg_surv_rate_info(); | |
3614 SpecializationStats::print(); | |
3615 } | |
3616 | |
3777
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7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
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|
3617 #ifndef PRODUCT |
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7046182: G1: remove unnecessary iterations over the collection set
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diff
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|
3618 // Helpful for debugging RSet issues. |
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|
3619 |
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|
3620 class PrintRSetsClosure : public HeapRegionClosure { |
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7046182: G1: remove unnecessary iterations over the collection set
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diff
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|
3621 private: |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
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diff
changeset
|
3622 const char* _msg; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3623 size_t _occupied_sum; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3624 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3625 public: |
e8b0b0392037
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diff
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|
3626 bool doHeapRegion(HeapRegion* r) { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3627 HeapRegionRemSet* hrrs = r->rem_set(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3628 size_t occupied = hrrs->occupied(); |
e8b0b0392037
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parents:
3774
diff
changeset
|
3629 _occupied_sum += occupied; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3630 |
e8b0b0392037
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parents:
3774
diff
changeset
|
3631 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3632 HR_FORMAT_PARAMS(r)); |
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parents:
3774
diff
changeset
|
3633 if (occupied == 0) { |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3634 gclog_or_tty->print_cr(" RSet is empty"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3635 } else { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3636 hrrs->print(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3637 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3638 gclog_or_tty->print_cr("----------"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3639 return false; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3640 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3641 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3642 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3643 gclog_or_tty->cr(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3644 gclog_or_tty->print_cr("========================================"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3645 gclog_or_tty->print_cr(msg); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3646 gclog_or_tty->cr(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3647 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3648 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3649 ~PrintRSetsClosure() { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3650 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3651 gclog_or_tty->print_cr("========================================"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3652 gclog_or_tty->cr(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3653 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3654 }; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3655 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3656 void G1CollectedHeap::print_cset_rsets() { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3657 PrintRSetsClosure cl("Printing CSet RSets"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3658 collection_set_iterate(&cl); |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3659 } |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3660 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3661 void G1CollectedHeap::print_all_rsets() { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3662 PrintRSetsClosure cl("Printing All RSets");; |
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7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3663 heap_region_iterate(&cl); |
e8b0b0392037
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3774
diff
changeset
|
3664 } |
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3774
diff
changeset
|
3665 #endif // PRODUCT |
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diff
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|
3666 |
342 | 3667 G1CollectedHeap* G1CollectedHeap::heap() { |
3668 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3669 "not a garbage-first heap"); | |
3670 return _g1h; | |
3671 } | |
3672 | |
3673 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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parents:
1166
diff
changeset
|
3674 // always_do_update_barrier = false; |
342 | 3675 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3676 // Fill TLAB's and such | |
3677 ensure_parsability(true); | |
12339
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
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12305
diff
changeset
|
3678 |
c319b188c7b2
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12305
diff
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|
3679 if (G1SummarizeRSetStats && (G1SummarizeRSetStatsPeriod > 0) && |
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3680 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3681 g1_rem_set()->print_periodic_summary_info("Before GC RS summary"); |
c319b188c7b2
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tschatzl
parents:
12305
diff
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|
3682 } |
342 | 3683 } |
3684 | |
3685 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
10372
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
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10327
diff
changeset
|
3686 |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
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10327
diff
changeset
|
3687 if (G1SummarizeRSetStats && |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3688 (G1SummarizeRSetStatsPeriod > 0) && |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3689 // we are at the end of the GC. Total collections has already been increased. |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3690 ((total_collections() - 1) % G1SummarizeRSetStatsPeriod == 0)) { |
12339
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3691 g1_rem_set()->print_periodic_summary_info("After GC RS summary"); |
10372
e72f7eecc96d
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tschatzl
parents:
10327
diff
changeset
|
3692 } |
e72f7eecc96d
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diff
changeset
|
3693 |
342 | 3694 // FIXME: what is this about? |
3695 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3696 // is set. | |
3697 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3698 "derived pointer present")); | |
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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parents:
1166
diff
changeset
|
3699 // always_do_update_barrier = true; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3701 // We have just completed a GC. Update the soft reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 // policy with the new heap occupancy |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 Universe::update_heap_info_at_gc(); |
342 | 3704 } |
3705 | |
1973 | 3706 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3707 unsigned int gc_count_before, | |
12113
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12082
diff
changeset
|
3708 bool* succeeded, |
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12082
diff
changeset
|
3709 GCCause::Cause gc_cause) { |
1973 | 3710 assert_heap_not_locked_and_not_at_safepoint(); |
342 | 3711 g1_policy()->record_stop_world_start(); |
1973 | 3712 VM_G1IncCollectionPause op(gc_count_before, |
3713 word_size, | |
3714 false, /* should_initiate_conc_mark */ | |
3715 g1_policy()->max_pause_time_ms(), | |
12113
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12082
diff
changeset
|
3716 gc_cause); |
1973 | 3717 VMThread::execute(&op); |
3718 | |
3719 HeapWord* result = op.result(); | |
3720 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3721 assert(result == NULL || ret_succeeded, | |
3722 "the result should be NULL if the VM did not succeed"); | |
3723 *succeeded = ret_succeeded; | |
3724 | |
3725 assert_heap_not_locked(); | |
3726 return result; | |
342 | 3727 } |
3728 | |
3729 void | |
3730 G1CollectedHeap::doConcurrentMark() { | |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3731 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3732 if (!_cmThread->in_progress()) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3733 _cmThread->set_started(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3734 CGC_lock->notify(); |
342 | 3735 } |
3736 } | |
3737 | |
3738 size_t G1CollectedHeap::pending_card_num() { | |
3739 size_t extra_cards = 0; | |
3740 JavaThread *curr = Threads::first(); | |
3741 while (curr != NULL) { | |
3742 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3743 extra_cards += dcq.size(); | |
3744 curr = curr->next(); | |
3745 } | |
3746 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3747 size_t buffer_size = dcqs.buffer_size(); | |
3748 size_t buffer_num = dcqs.completed_buffers_num(); | |
6611 | 3749 |
3750 // PtrQueueSet::buffer_size() and PtrQueue:size() return sizes | |
3751 // in bytes - not the number of 'entries'. We need to convert | |
3752 // into a number of cards. | |
3753 return (buffer_size * buffer_num + extra_cards) / oopSize; | |
342 | 3754 } |
3755 | |
3756 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3757 return g1_rem_set()->cardsScanned(); |
342 | 3758 } |
3759 | |
3760 void | |
3761 G1CollectedHeap::setup_surviving_young_words() { | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3762 assert(_surviving_young_words == NULL, "pre-condition"); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3763 uint array_length = g1_policy()->young_cset_region_length(); |
6197 | 3764 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, (size_t) array_length, mtGC); |
342 | 3765 if (_surviving_young_words == NULL) { |
10161
746b070f5022
8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
ccheung
parents:
10099
diff
changeset
|
3766 vm_exit_out_of_memory(sizeof(size_t) * array_length, OOM_MALLOC_ERROR, |
342 | 3767 "Not enough space for young surv words summary."); |
3768 } | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3769 memset(_surviving_young_words, 0, (size_t) array_length * sizeof(size_t)); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3770 #ifdef ASSERT |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3771 for (uint i = 0; i < array_length; ++i) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3772 assert( _surviving_young_words[i] == 0, "memset above" ); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3773 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3774 #endif // !ASSERT |
342 | 3775 } |
3776 | |
3777 void | |
3778 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3779 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3780 uint array_length = g1_policy()->young_cset_region_length(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3781 for (uint i = 0; i < array_length; ++i) { |
342 | 3782 _surviving_young_words[i] += surv_young_words[i]; |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3783 } |
342 | 3784 } |
3785 | |
3786 void | |
3787 G1CollectedHeap::cleanup_surviving_young_words() { | |
3788 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
6197 | 3789 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words, mtGC); |
342 | 3790 _surviving_young_words = NULL; |
3791 } | |
3792 | |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3793 #ifdef ASSERT |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3794 class VerifyCSetClosure: public HeapRegionClosure { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3795 public: |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3796 bool doHeapRegion(HeapRegion* hr) { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3797 // Here we check that the CSet region's RSet is ready for parallel |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3798 // iteration. The fields that we'll verify are only manipulated |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3799 // when the region is part of a CSet and is collected. Afterwards, |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3800 // we reset these fields when we clear the region's RSet (when the |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3801 // region is freed) so they are ready when the region is |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3802 // re-allocated. The only exception to this is if there's an |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3803 // evacuation failure and instead of freeing the region we leave |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3804 // it in the heap. In that case, we reset these fields during |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3805 // evacuation failure handling. |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3806 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3807 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3808 // Here's a good place to add any other checks we'd like to |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3809 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3810 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3811 } |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3812 }; |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3813 #endif // ASSERT |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3814 |
1709 | 3815 #if TASKQUEUE_STATS |
3816 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3817 st->print_raw_cr("GC Task Stats"); | |
3818 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3819 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3820 } | |
3821 | |
3822 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3823 print_taskqueue_stats_hdr(st); | |
3824 | |
3825 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3826 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3827 for (int i = 0; i < n; ++i) { |
3828 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3829 totals += task_queue(i)->stats; | |
3830 } | |
3831 st->print_raw("tot "); totals.print(st); st->cr(); | |
3832 | |
3833 DEBUG_ONLY(totals.verify()); | |
3834 } | |
3835 | |
3836 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3837 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3838 for (int i = 0; i < n; ++i) { |
3839 task_queue(i)->stats.reset(); | |
3840 } | |
3841 } | |
3842 #endif // TASKQUEUE_STATS | |
3843 | |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3844 void G1CollectedHeap::log_gc_header() { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3845 if (!G1Log::fine()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3846 return; |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3847 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3848 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3849 gclog_or_tty->date_stamp(PrintGCDateStamps); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3850 gclog_or_tty->stamp(PrintGCTimeStamps); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3851 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3852 GCCauseString gc_cause_str = GCCauseString("GC pause", gc_cause()) |
7455
0b54ffe4c2d3
8005672: Clean up some changes to GC logging with GCCause's
jmasa
parents:
7397
diff
changeset
|
3853 .append(g1_policy()->gcs_are_young() ? "(young)" : "(mixed)") |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3854 .append(g1_policy()->during_initial_mark_pause() ? " (initial-mark)" : ""); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3855 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3856 gclog_or_tty->print("[%s", (const char*)gc_cause_str); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3857 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3858 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3859 void G1CollectedHeap::log_gc_footer(double pause_time_sec) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3860 if (!G1Log::fine()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3861 return; |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3862 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3863 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3864 if (G1Log::finer()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3865 if (evacuation_failed()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3866 gclog_or_tty->print(" (to-space exhausted)"); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3867 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3868 gclog_or_tty->print_cr(", %3.7f secs]", pause_time_sec); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3869 g1_policy()->phase_times()->note_gc_end(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3870 g1_policy()->phase_times()->print(pause_time_sec); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3871 g1_policy()->print_detailed_heap_transition(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3872 } else { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3873 if (evacuation_failed()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3874 gclog_or_tty->print("--"); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3875 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3876 g1_policy()->print_heap_transition(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3877 gclog_or_tty->print_cr(", %3.7f secs]", pause_time_sec); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3878 } |
7207
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
3879 gclog_or_tty->flush(); |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3880 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3881 |
1973 | 3882 bool |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3883 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3884 assert_at_safepoint(true /* should_be_vm_thread */); |
3885 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3886 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3887 if (GC_locker::check_active_before_gc()) { |
1973 | 3888 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3889 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3890 |
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
13062
diff
changeset
|
3891 _gc_timer_stw->register_gc_start(); |
10405 | 3892 |
3893 _gc_tracer_stw->report_gc_start(gc_cause(), _gc_timer_stw->gc_start()); | |
3894 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3895 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3896 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3897 |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3898 print_heap_before_gc(); |
10405 | 3899 trace_heap_before_gc(_gc_tracer_stw); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3900 |
4072 | 3901 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3902 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3903 verify_dirty_young_regions(); |
2152 | 3904 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3905 // This call will decide whether this pause is an initial-mark |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3906 // pause. If it is, during_initial_mark_pause() will return true |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3907 // for the duration of this pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3908 g1_policy()->decide_on_conc_mark_initiation(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3909 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3910 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3911 assert(!g1_policy()->during_initial_mark_pause() || |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3912 g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3913 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3914 // We also do not allow mixed GCs during marking. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3915 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3916 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3917 // Record whether this pause is an initial mark. When the current |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3918 // thread has completed its logging output and it's safe to signal |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3919 // the CM thread, the flag's value in the policy has been reset. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3920 bool should_start_conc_mark = g1_policy()->during_initial_mark_pause(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3921 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3922 // Inner scope for scope based logging, timers, and stats collection |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3923 { |
10405 | 3924 EvacuationInfo evacuation_info; |
3925 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3926 if (g1_policy()->during_initial_mark_pause()) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3927 // We are about to start a marking cycle, so we increment the |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3928 // full collection counter. |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
3929 increment_old_marking_cycles_started(); |
10405 | 3930 register_concurrent_cycle_start(_gc_timer_stw->gc_start()); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3931 } |
10405 | 3932 |
3933 _gc_tracer_stw->report_yc_type(yc_type()); | |
3934 | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3935 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
6030 | 3936 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3937 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3938 workers()->active_workers() : 1); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
3939 double pause_start_sec = os::elapsedTime(); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
3940 g1_policy()->phase_times()->note_gc_start(active_workers); |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3941 log_gc_header(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3942 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3943 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3944 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3945 |
2361 | 3946 // If the secondary_free_list is not empty, append it to the |
3947 // free_list. No need to wait for the cleanup operation to finish; | |
3948 // the region allocation code will check the secondary_free_list | |
3949 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3950 // set, skip this step so that the region allocation code has to | |
3951 // get entries from the secondary_free_list. | |
2152 | 3952 if (!G1StressConcRegionFreeing) { |
2361 | 3953 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3954 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3955 |
12080 | 3956 assert(check_young_list_well_formed(), "young list should be well formed"); |
3957 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3958 "sanity check"); | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3959 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3960 // Don't dynamically change the number of GC threads this early. A value of |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3961 // 0 is used to indicate serial work. When parallel work is done, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3962 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3963 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3964 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3965 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3966 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3967 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3968 increment_total_collections(false /* full gc */); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3969 increment_gc_time_stamp(); |
342 | 3970 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
3971 verify_before_gc(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3972 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3973 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3974 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3975 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3976 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3977 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3978 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3979 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3980 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3981 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3982 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3983 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3984 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3985 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3986 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3987 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3988 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3989 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3990 // Forget the current alloc region (we might even choose it to be part |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3991 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3992 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3993 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3994 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3995 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3996 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3997 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3998 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3999 // This timing is only used by the ergonomics to handle our pause target. |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4000 // It is unclear why this should not include the full pause. We will |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4001 // investigate this in CR 7178365. |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4002 // |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4003 // Preserving the old comment here if that helps the investigation: |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4004 // |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4005 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4006 // the possible verification above. |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4007 double sample_start_time_sec = os::elapsedTime(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4008 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4009 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4010 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4011 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4012 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4013 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4014 |
10098
71013d764f6e
8010780: G1: Eden occupancy/capacity output wrong after a full GC
johnc
parents:
8855
diff
changeset
|
4015 g1_policy()->record_collection_pause_start(sample_start_time_sec); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4016 |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4017 double scan_wait_start = os::elapsedTime(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4018 // We have to wait until the CM threads finish scanning the |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4019 // root regions as it's the only way to ensure that all the |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4020 // objects on them have been correctly scanned before we start |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4021 // moving them during the GC. |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4022 bool waited = _cm->root_regions()->wait_until_scan_finished(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4023 double wait_time_ms = 0.0; |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4024 if (waited) { |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4025 double scan_wait_end = os::elapsedTime(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4026 wait_time_ms = (scan_wait_end - scan_wait_start) * 1000.0; |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4027 } |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4028 g1_policy()->phase_times()->record_root_region_scan_wait_time(wait_time_ms); |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4029 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4030 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4031 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4032 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4033 #endif // YOUNG_LIST_VERBOSE |
342 | 4034 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4035 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4036 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4037 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4038 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
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|
4039 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4040 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4041 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4042 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4043 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4044 |
10405 | 4045 g1_policy()->finalize_cset(target_pause_time_ms, evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4046 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4047 _cm->note_start_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4048 // We should not verify the per-thread SATB buffers given that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4049 // we have not filtered them yet (we'll do so during the |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
4050 // GC). We also call this after finalize_cset() to |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4051 // ensure that the CSet has been finalized. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4052 _cm->verify_no_cset_oops(true /* verify_stacks */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4053 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4054 false /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4055 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4056 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4057 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4058 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4059 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4060 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4061 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4062 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4063 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4064 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4065 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4066 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4067 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4068 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4069 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4070 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4071 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4072 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
4073 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4074 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4075 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
4076 #endif // ASSERT |
1707 | 4077 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4078 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4079 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4080 // Initialize the GC alloc regions. |
10405 | 4081 init_gc_alloc_regions(evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4082 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4083 // Actually do the work... |
10405 | 4084 evacuate_collection_set(evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4085 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4086 // We do this to mainly verify the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4087 // (which have been filtered by now) since we didn't verify |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4088 // them earlier. No point in re-checking the stacks / enqueued |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4089 // buffers given that the CSet has not changed since last time |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4090 // we checked. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4091 _cm->verify_no_cset_oops(false /* verify_stacks */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4092 false /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4093 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4094 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4095 |
10405 | 4096 free_collection_set(g1_policy()->collection_set(), evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4097 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4098 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4099 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4100 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4101 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4102 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4103 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4104 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4105 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4106 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4107 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4108 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4109 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4110 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4111 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4112 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4113 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4114 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4115 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4116 "young list should be empty"); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4117 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4118 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4119 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4120 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4121 #endif // YOUNG_LIST_VERBOSE |
342 | 4122 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4123 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
10405 | 4124 _young_list->first_survivor_region(), |
4125 _young_list->last_survivor_region()); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4126 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4127 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4128 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4129 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4130 _summary_bytes_used = recalculate_used(); |
10405 | 4131 uint n_queues = MAX2((int)ParallelGCThreads, 1); |
4132 for (uint i = 0; i < n_queues; i++) { | |
4133 if (_evacuation_failed_info_array[i].has_failed()) { | |
4134 _gc_tracer_stw->report_evacuation_failed(_evacuation_failed_info_array[i]); | |
4135 } | |
4136 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4137 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4138 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4139 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4140 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4141 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4142 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4143 if (g1_policy()->during_initial_mark_pause()) { |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4144 // We have to do this before we notify the CM threads that |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4145 // they can start working to make sure that all the |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4146 // appropriate initialization is done on the CM object. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4147 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4148 set_marking_started(); |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4149 // Note that we don't actually trigger the CM thread at |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4150 // this point. We do that later when we're sure that |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4151 // the current thread has completed its logging output. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4152 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4153 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4154 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
4155 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4156 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4157 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4158 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4159 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4160 #endif // YOUNG_LIST_VERBOSE |
342 | 4161 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4162 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4163 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4164 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4165 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4166 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4167 size_t bytes_before = capacity(); |
4785 | 4168 // No need for an ergo verbose message here, |
4169 // expansion_amount() does this when it returns a value > 0. | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4170 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4171 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4172 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4173 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4174 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4175 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4176 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4177 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4178 |
10405 | 4179 // We redo the verification but now wrt to the new CSet which |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4180 // has just got initialized after the previous CSet was freed. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4181 _cm->verify_no_cset_oops(true /* verify_stacks */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4182 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4183 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4184 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4185 _cm->note_end_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4186 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4187 // This timing is only used by the ergonomics to handle our pause target. |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4188 // It is unclear why this should not include the full pause. We will |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4189 // investigate this in CR 7178365. |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4190 double sample_end_time_sec = os::elapsedTime(); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4191 double pause_time_ms = (sample_end_time_sec - sample_start_time_sec) * MILLIUNITS; |
10405 | 4192 g1_policy()->record_collection_pause_end(pause_time_ms, evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4193 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4194 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4195 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4196 // In prepare_for_verify() below we'll need to scan the deferred |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4197 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4198 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4199 // the update buffers we'll probably need to scan cards on the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4200 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4201 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4202 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4203 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4204 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4205 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4206 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4207 // on the region is current or not, by incrementing the GC time |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4208 // stamp here we invalidate all the GC time stamps on all the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4209 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4210 // all the regions. This is a nicer way of ensuring this rather |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4211 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4212 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4213 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4214 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4215 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4216 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4217 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4218 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
4219 verify_after_gc(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4220 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4221 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4222 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4223 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4224 // CM reference discovery will be re-enabled if necessary. |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4225 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4226 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4227 // We should do this after we potentially expand the heap so |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4228 // that all the COMMIT events are generated before the end GC |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4229 // event, and after we retire the GC alloc regions so that all |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4230 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4231 _hr_printer.end_gc(false /* full */, (size_t) total_collections()); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4232 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4233 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4234 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4235 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4236 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4237 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4238 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4239 #endif |
342 | 4240 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4241 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4242 } |
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4243 |
7207
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
4244 // Print the remainder of the GC log output. |
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
4245 log_gc_footer(os::elapsedTime() - pause_start_sec); |
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
4246 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4247 // It is not yet to safe to tell the concurrent mark to |
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4248 // start as we have some optional output below. We don't want the |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4249 // output from the concurrent mark thread interfering with this |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4250 // logging output either. |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4251 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4252 _hrs.verify_optional(); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4253 verify_region_sets_optional(); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4254 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4255 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4256 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4257 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4258 print_heap_after_gc(); |
10405 | 4259 trace_heap_after_gc(_gc_tracer_stw); |
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4260 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4261 // We must call G1MonitoringSupport::update_sizes() in the same scoping level |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4262 // as an active TraceMemoryManagerStats object (i.e. before the destructor for the |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4263 // TraceMemoryManagerStats is called) so that the G1 memory pools are updated |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4264 // before any GC notifications are raised. |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4265 g1mm()->update_sizes(); |
10405 | 4266 |
4267 _gc_tracer_stw->report_evacuation_info(&evacuation_info); | |
4268 _gc_tracer_stw->report_tenuring_threshold(_g1_policy->tenuring_threshold()); | |
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
13062
diff
changeset
|
4269 _gc_timer_stw->register_gc_end(); |
10405 | 4270 _gc_tracer_stw->report_gc_end(_gc_timer_stw->gc_end(), _gc_timer_stw->time_partitions()); |
4271 } | |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4272 // It should now be safe to tell the concurrent mark thread to start |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4273 // without its logging output interfering with the logging output |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4274 // that came from the pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4275 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4276 if (should_start_conc_mark) { |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4277 // CAUTION: after the doConcurrentMark() call below, |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4278 // the concurrent marking thread(s) could be running |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4279 // concurrently with us. Make sure that anything after |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4280 // this point does not assume that we are the only GC thread |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4281 // running. Note: of course, the actual marking work will |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4282 // not start until the safepoint itself is released in |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4283 // ConcurrentGCThread::safepoint_desynchronize(). |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4284 doConcurrentMark(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4285 } |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4286 |
1973 | 4287 return true; |
342 | 4288 } |
4289 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4290 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4291 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4292 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4293 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4294 case GCAllocForSurvived: |
6595 | 4295 gclab_word_size = _survivor_plab_stats.desired_plab_sz(); |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4296 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4297 case GCAllocForTenured: |
6595 | 4298 gclab_word_size = _old_plab_stats.desired_plab_sz(); |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4299 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4300 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4301 assert(false, "unknown GCAllocPurpose"); |
6595 | 4302 gclab_word_size = _old_plab_stats.desired_plab_sz(); |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4303 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4304 } |
6595 | 4305 |
4306 // Prevent humongous PLAB sizes for two reasons: | |
4307 // * PLABs are allocated using a similar paths as oops, but should | |
4308 // never be in a humongous region | |
4309 // * Allowing humongous PLABs needlessly churns the region free lists | |
4310 return MIN2(_humongous_object_threshold_in_words, gclab_word_size); | |
1391
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|
4311 } |
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diff
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|
4312 |
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
4313 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
4314 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
4315 _mutator_alloc_region.init(); |
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|
4316 } |
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|
4317 |
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|
4318 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
4319 _mutator_alloc_region.release(); |
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|
4320 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
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|
4321 } |
1391
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4322 |
10405 | 4323 void G1CollectedHeap::init_gc_alloc_regions(EvacuationInfo& evacuation_info) { |
3830
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|
4324 assert_at_safepoint(true /* should_be_vm_thread */); |
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|
4325 |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4326 _survivor_gc_alloc_region.init(); |
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|
4327 _old_gc_alloc_region.init(); |
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|
4328 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4329 _retained_old_gc_alloc_region = NULL; |
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|
4330 |
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|
4331 // We will discard the current GC alloc region if: |
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|
4332 // a) it's in the collection set (it can happen!), |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4333 // b) it's already full (no point in using it), |
f44782f04dd4
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|
4334 // c) it's empty (this means that it was emptied during |
f44782f04dd4
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|
4335 // a cleanup and it should be on the free list now), or |
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|
4336 // d) it's humongous (this means that it was emptied |
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|
4337 // during a cleanup and was added to the free list, but |
10405 | 4338 // has been subsequently used to allocate a humongous |
3830
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|
4339 // object that may be less than the region size). |
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|
4340 if (retained_region != NULL && |
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|
4341 !retained_region->in_collection_set() && |
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|
4342 !(retained_region->top() == retained_region->end()) && |
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|
4343 !retained_region->is_empty() && |
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|
4344 !retained_region->isHumongous()) { |
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|
4345 retained_region->set_saved_mark(); |
4072 | 4346 // The retained region was added to the old region set when it was |
4347 // retired. We have to remove it now, since we don't allow regions | |
4348 // we allocate to in the region sets. We'll re-add it later, when | |
4349 // it's retired again. | |
4350 _old_set.remove(retained_region); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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changeset
|
4351 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4352 retained_region->note_start_of_copying(during_im); |
3830
f44782f04dd4
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|
4353 _old_gc_alloc_region.set(retained_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
4354 _hr_printer.reuse(retained_region); |
10405 | 4355 evacuation_info.set_alloc_regions_used_before(retained_region->used()); |
4356 } | |
4357 } | |
4358 | |
4359 void G1CollectedHeap::release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) { | |
4360 evacuation_info.set_allocation_regions(_survivor_gc_alloc_region.count() + | |
4361 _old_gc_alloc_region.count()); | |
3830
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|
4362 _survivor_gc_alloc_region.release(); |
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|
4363 // If we have an old GC alloc region to release, we'll save it in |
f44782f04dd4
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changeset
|
4364 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4365 // _retained_old_gc_alloc_region will become NULL. This is what we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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changeset
|
4366 // want either way so no reason to check explicitly for either |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
4367 // condition. |
f44782f04dd4
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parents:
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changeset
|
4368 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
6595 | 4369 |
4370 if (ResizePLAB) { | |
6819 | 4371 _survivor_plab_stats.adjust_desired_plab_sz(no_of_gc_workers); |
4372 _old_plab_stats.adjust_desired_plab_sz(no_of_gc_workers); | |
6595 | 4373 } |
342 | 4374 } |
4375 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4376 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4377 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4378 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
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|
4379 _retained_old_gc_alloc_region = NULL; |
342 | 4380 } |
4381 | |
4382 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
4383 _drain_in_progress = false; | |
4384 set_evac_failure_closure(cl); | |
6197 | 4385 _evac_failure_scan_stack = new (ResourceObj::C_HEAP, mtGC) GrowableArray<oop>(40, true); |
342 | 4386 } |
4387 | |
4388 void G1CollectedHeap::finalize_for_evac_failure() { | |
4389 assert(_evac_failure_scan_stack != NULL && | |
4390 _evac_failure_scan_stack->length() == 0, | |
4391 "Postcondition"); | |
4392 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 4393 delete _evac_failure_scan_stack; |
342 | 4394 _evac_failure_scan_stack = NULL; |
4395 } | |
4396 | |
4397 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4398 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4399 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4400 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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parents:
4781
diff
changeset
|
4401 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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parents:
4781
diff
changeset
|
4402 if (G1CollectedHeap::use_parallel_gc_threads()) { |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4403 set_par_threads(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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parents:
4781
diff
changeset
|
4404 workers()->run_task(&rsfp_task); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4405 set_par_threads(0); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4406 } else { |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4407 rsfp_task.work(0); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4408 } |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4409 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4410 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4411 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4412 // Reset the claim values in the regions in the collection set. |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4413 reset_cset_heap_region_claim_values(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4414 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4415 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
342 | 4416 |
4417 // Now restore saved marks, if any. | |
8038
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
parents:
7455
diff
changeset
|
4418 assert(_objs_with_preserved_marks.size() == |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
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7455
diff
changeset
|
4419 _preserved_marks_of_objs.size(), "Both or none."); |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
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7455
diff
changeset
|
4420 while (!_objs_with_preserved_marks.is_empty()) { |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
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diff
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|
4421 oop obj = _objs_with_preserved_marks.pop(); |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
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diff
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|
4422 markOop m = _preserved_marks_of_objs.pop(); |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
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diff
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|
4423 obj->set_mark(m); |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
parents:
7455
diff
changeset
|
4424 } |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
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diff
changeset
|
4425 _objs_with_preserved_marks.clear(true); |
ad747ee9d0b1
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diff
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|
4426 _preserved_marks_of_objs.clear(true); |
342 | 4427 } |
4428 | |
4429 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4430 _evac_failure_scan_stack->push(obj); | |
4431 } | |
4432 | |
4433 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4434 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4435 | |
4436 while (_evac_failure_scan_stack->length() > 0) { | |
4437 oop obj = _evac_failure_scan_stack->pop(); | |
4438 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4439 obj->oop_iterate_backwards(_evac_failure_closure); | |
4440 } | |
4441 } | |
4442 | |
4443 oop | |
10405 | 4444 G1CollectedHeap::handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
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|
4445 oop old) { |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4446 assert(obj_in_cs(old), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4447 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4448 (HeapWord*) old)); |
342 | 4449 markOop m = old->mark(); |
4450 oop forward_ptr = old->forward_to_atomic(old); | |
4451 if (forward_ptr == NULL) { | |
4452 // Forward-to-self succeeded. | |
10405 | 4453 assert(_par_scan_state != NULL, "par scan state"); |
4454 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4455 uint queue_num = _par_scan_state->queue_num(); | |
4456 | |
4457 _evacuation_failed = true; | |
4458 _evacuation_failed_info_array[queue_num].register_copy_failure(old->size()); | |
342 | 4459 if (_evac_failure_closure != cl) { |
4460 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4461 assert(!_drain_in_progress, | |
4462 "Should only be true while someone holds the lock."); | |
4463 // Set the global evac-failure closure to the current thread's. | |
4464 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4465 set_evac_failure_closure(cl); | |
4466 // Now do the common part. | |
4467 handle_evacuation_failure_common(old, m); | |
4468 // Reset to NULL. | |
4469 set_evac_failure_closure(NULL); | |
4470 } else { | |
4471 // The lock is already held, and this is recursive. | |
4472 assert(_drain_in_progress, "This should only be the recursive case."); | |
4473 handle_evacuation_failure_common(old, m); | |
4474 } | |
4475 return old; | |
4476 } else { | |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4477 // Forward-to-self failed. Either someone else managed to allocate |
75af3e8de182
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3317
diff
changeset
|
4478 // space for this object (old != forward_ptr) or they beat us in |
75af3e8de182
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3317
diff
changeset
|
4479 // self-forwarding it (old == forward_ptr). |
75af3e8de182
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3317
diff
changeset
|
4480 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4481 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
75af3e8de182
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3317
diff
changeset
|
4482 "should not be in the CSet", |
75af3e8de182
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3317
diff
changeset
|
4483 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4484 return forward_ptr; |
4485 } | |
4486 } | |
4487 | |
4488 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4489 preserve_mark_if_necessary(old, m); | |
4490 | |
4491 HeapRegion* r = heap_region_containing(old); | |
4492 if (!r->evacuation_failed()) { | |
4493 r->set_evacuation_failed(true); | |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4494 _hr_printer.evac_failure(r); |
342 | 4495 } |
4496 | |
4497 push_on_evac_failure_scan_stack(old); | |
4498 | |
4499 if (!_drain_in_progress) { | |
4500 // prevent recursion in copy_to_survivor_space() | |
4501 _drain_in_progress = true; | |
4502 drain_evac_failure_scan_stack(); | |
4503 _drain_in_progress = false; | |
4504 } | |
4505 } | |
4506 | |
4507 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4508 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4509 // We want to call the "for_promotion_failure" version only in the |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4510 // case of a promotion failure. |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4511 if (m->must_be_preserved_for_promotion_failure(obj)) { |
8038
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
parents:
7455
diff
changeset
|
4512 _objs_with_preserved_marks.push(obj); |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
parents:
7455
diff
changeset
|
4513 _preserved_marks_of_objs.push(m); |
342 | 4514 } |
4515 } | |
4516 | |
4517 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4518 size_t word_size) { | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4519 if (purpose == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4520 HeapWord* result = survivor_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4521 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4522 return result; |
342 | 4523 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4524 // Let's try to allocate in the old gen in case we can fit the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4525 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4526 return old_attempt_allocation(word_size); |
342 | 4527 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4528 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4529 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4530 HeapWord* result = old_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4531 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4532 return result; |
342 | 4533 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4534 // Let's try to allocate in the survivors in case we can fit the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4535 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4536 return survivor_attempt_allocation(word_size); |
342 | 4537 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4538 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4539 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4540 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4541 // Trying to keep some compilers happy. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4542 return NULL; |
342 | 4543 } |
4544 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4545 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4546 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4547 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4548 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4549 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4550 _refs(g1h->task_queue(queue_num)), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4551 _dcq(&g1h->dirty_card_queue_set()), |
12343 | 4552 _ct_bs(g1h->g1_barrier_set()), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4553 _g1_rem(g1h->g1_rem_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4554 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4555 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4556 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4557 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4558 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4559 _strong_roots_time(0), _term_time(0), |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4560 _alloc_buffer_waste(0), _undo_waste(0) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4561 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4562 // we "sacrifice" entry 0 to keep track of surviving bytes for |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4563 // non-young regions (where the age is -1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4564 // We also add a few elements at the beginning and at the end in |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4565 // an attempt to eliminate cache contention |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4566 uint real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4567 uint array_length = PADDING_ELEM_NUM + |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4568 real_length + |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4569 PADDING_ELEM_NUM; |
6197 | 4570 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length, mtGC); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4571 if (_surviving_young_words_base == NULL) |
10161
746b070f5022
8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
ccheung
parents:
10099
diff
changeset
|
4572 vm_exit_out_of_memory(array_length * sizeof(size_t), OOM_MALLOC_ERROR, |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4573 "Not enough space for young surv histo."); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4574 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4575 memset(_surviving_young_words, 0, (size_t) real_length * sizeof(size_t)); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4576 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4577 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4578 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4579 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4580 _start = os::elapsedTime(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4581 } |
342 | 4582 |
1709 | 4583 void |
4584 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4585 { | |
4586 st->print_raw_cr("GC Termination Stats"); | |
4587 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4588 " ------waste (KiB)------"); | |
4589 st->print_raw_cr("thr ms ms % ms % attempts" | |
4590 " total alloc undo"); | |
4591 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4592 " ------- ------- -------"); | |
4593 } | |
4594 | |
4595 void | |
4596 G1ParScanThreadState::print_termination_stats(int i, | |
4597 outputStream* const st) const | |
4598 { | |
4599 const double elapsed_ms = elapsed_time() * 1000.0; | |
4600 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4601 const double term_ms = term_time() * 1000.0; | |
4602 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4603 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4604 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4605 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4606 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4607 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4608 alloc_buffer_waste() * HeapWordSize / K, | |
4609 undo_waste() * HeapWordSize / K); | |
4610 } | |
4611 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4612 #ifdef ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4613 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4614 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4615 assert(UseCompressedOops, "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4616 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4617 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4618 assert(_g1h->is_in_g1_reserved(p), |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
4619 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, (void *)p)); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4620 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4621 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4622 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4623 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4624 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4625 if (has_partial_array_mask(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4626 // Must be in the collection set--it's already been copied. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4627 oop p = clear_partial_array_mask(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4628 assert(_g1h->obj_in_cs(p), |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
4629 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, (void *)p)); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4630 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4631 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4632 assert(_g1h->is_in_g1_reserved(p), |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
4633 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, (void *)p)); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4634 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4635 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4636 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4637 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4638 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4639 if (ref.is_narrow()) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4640 return verify_ref((narrowOop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4641 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4642 return verify_ref((oop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4643 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4644 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4645 #endif // ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4646 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4647 void G1ParScanThreadState::trim_queue() { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4648 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4649 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4650 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4651 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4652 StarTask ref; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4653 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
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|
4654 // Drain the overflow stack first, so other threads can steal. |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4655 while (refs()->pop_overflow(ref)) { |
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4656 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
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|
4657 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4658 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4659 while (refs()->pop_local(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4660 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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|
4661 } |
b14ec34b1e07
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|
4662 } while (!refs()->is_empty()); |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
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|
4663 } |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4664 |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
4665 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
2ace1c4ee8da
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diff
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|
4666 G1ParScanThreadState* par_scan_state) : |
342 | 4667 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4668 _par_scan_state(par_scan_state), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
4669 _worker_id(par_scan_state->queue_num()), |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4670 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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|
4671 _mark_in_progress(_g1->mark_in_progress()) { } |
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|
4672 |
5987 | 4673 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4674 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object>::mark_object(oop obj) { | |
4787
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diff
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|
4675 #ifdef ASSERT |
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|
4676 HeapRegion* hr = _g1->heap_region_containing(obj); |
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|
4677 assert(hr != NULL, "sanity"); |
2ace1c4ee8da
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|
4678 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4679 #endif // ASSERT |
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|
4680 |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4681 // We know that the object is not moving so it's safe to read its size. |
4836
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6484965: G1: piggy-back liveness accounting phase on marking
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|
4682 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
4787
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|
4683 } |
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|
4684 |
5987 | 4685 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4686 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
4687 ::mark_forwarded_object(oop from_obj, oop to_obj) { | |
4787
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parents:
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diff
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|
4688 #ifdef ASSERT |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4689 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
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|
4690 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
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|
4691 assert(from_obj != to_obj, "should not be self-forwarded"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
4692 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4693 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
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|
4694 assert(from_hr != NULL, "sanity"); |
2ace1c4ee8da
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diff
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|
4695 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
4696 |
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|
4697 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
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|
4698 assert(to_hr != NULL, "sanity"); |
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parents:
4785
diff
changeset
|
4699 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
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diff
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|
4700 #endif // ASSERT |
2ace1c4ee8da
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4785
diff
changeset
|
4701 |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
4702 // The object might be in the process of being copied by another |
2ace1c4ee8da
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parents:
4785
diff
changeset
|
4703 // worker so we cannot trust that its to-space image is |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
4704 // well-formed. So we have to read its size from its from-space |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
4705 // image which we know should not be changing. |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4834
diff
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|
4706 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
4787
2ace1c4ee8da
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parents:
4785
diff
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|
4707 } |
2ace1c4ee8da
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diff
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|
4708 |
5987 | 4709 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4710 oop G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
4711 ::copy_to_survivor_space(oop old) { | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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parents:
6008
diff
changeset
|
4712 size_t word_sz = old->size(); |
342 | 4713 HeapRegion* from_region = _g1->heap_region_containing_raw(old); |
4714 // +1 to make the -1 indexes valid... | |
4715 int young_index = from_region->young_index_in_cset()+1; | |
4787
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|
4716 assert( (from_region->is_young() && young_index > 0) || |
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diff
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|
4717 (!from_region->is_young() && young_index == 0), "invariant" ); |
342 | 4718 G1CollectorPolicy* g1p = _g1->g1_policy(); |
4719 markOop m = old->mark(); | |
545 | 4720 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4721 : m->age(); | |
4722 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4723 word_sz); |
4724 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
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7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4725 #ifndef PRODUCT |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4726 // Should this evacuation fail? |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
6628
diff
changeset
|
4727 if (_g1->evacuation_should_fail()) { |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
4728 if (obj_ptr != NULL) { |
c9814fadeb38
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parents:
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diff
changeset
|
4729 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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changeset
|
4730 obj_ptr = NULL; |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
6628
diff
changeset
|
4731 } |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
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diff
changeset
|
4732 } |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4733 #endif // !PRODUCT |
342 | 4734 |
4735 if (obj_ptr == NULL) { | |
4736 // This will either forward-to-self, or detect that someone else has | |
4737 // installed a forwarding pointer. | |
10405 | 4738 return _g1->handle_evacuation_failure_par(_par_scan_state, old); |
342 | 4739 } |
4740 | |
6629
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7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4741 oop obj = oop(obj_ptr); |
c9814fadeb38
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parents:
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diff
changeset
|
4742 |
526 | 4743 // We're going to allocate linearly, so might as well prefetch ahead. |
4744 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4745 | |
342 | 4746 oop forward_ptr = old->forward_to_atomic(obj); |
4747 if (forward_ptr == NULL) { | |
4748 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4749 if (g1p->track_object_age(alloc_purpose)) { |
4750 // We could simply do obj->incr_age(). However, this causes a | |
4751 // performance issue. obj->incr_age() will first check whether | |
4752 // the object has a displaced mark by checking its mark word; | |
4753 // getting the mark word from the new location of the object | |
4754 // stalls. So, given that we already have the mark word and we | |
4755 // are about to install it anyway, it's better to increase the | |
4756 // age on the mark word, when the object does not have a | |
4757 // displaced mark word. We're not expecting many objects to have | |
4758 // a displaced marked word, so that case is not optimized | |
4759 // further (it could be...) and we simply call obj->incr_age(). | |
4760 | |
4761 if (m->has_displaced_mark_helper()) { | |
4762 // in this case, we have to install the mark word first, | |
4763 // otherwise obj looks to be forwarded (the old mark word, | |
4764 // which contains the forward pointer, was copied) | |
4765 obj->set_mark(m); | |
4766 obj->incr_age(); | |
4767 } else { | |
4768 m = m->incr_age(); | |
545 | 4769 obj->set_mark(m); |
526 | 4770 } |
545 | 4771 _par_scan_state->age_table()->add(obj, word_sz); |
4772 } else { | |
4773 obj->set_mark(m); | |
526 | 4774 } |
4775 | |
342 | 4776 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
4777 surv_young_words[young_index] += word_sz; | |
4778 | |
4779 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4780 // We keep track of the next start index in the length field of |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4781 // the to-space object. The actual length can be found in the |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4782 // length field of the from-space object. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4783 arrayOop(obj)->set_length(0); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4784 oop* old_p = set_partial_array_mask(old); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4785 _par_scan_state->push_on_queue(old_p); |
342 | 4786 } else { |
526 | 4787 // No point in using the slower heap_region_containing() method, |
4788 // given that we know obj is in the heap. | |
5987 | 4789 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
4790 obj->oop_iterate_backwards(&_scanner); | |
342 | 4791 } |
4792 } else { | |
4793 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4794 obj = forward_ptr; | |
4795 } | |
4796 return obj; | |
4797 } | |
4798 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
4799 template <class T> |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
4800 void G1ParCopyHelper::do_klass_barrier(T* p, oop new_obj) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
4801 if (_g1->heap_region_containing_raw(new_obj)->is_young()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
4802 _scanned_klass->record_modified_oops(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
4803 } |
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6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
4804 } |
da91efe96a93
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diff
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|
4805 |
3886
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|
4806 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
df6caf649ff7
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|
4807 template <class T> |
3886
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3869
diff
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|
4808 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4809 ::do_oop_work(T* p) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4810 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4811 assert(barrier != G1BarrierRS || obj != NULL, |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
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|
4812 "Precondition: G1BarrierRS implies obj is non-NULL"); |
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eeae91c9baba
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|
4813 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4834
diff
changeset
|
4814 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4834
diff
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|
4815 |
526 | 4816 // here the null check is implicit in the cset_fast_test() test |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4817 if (_g1->in_cset_fast_test(obj)) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4818 oop forwardee; |
526 | 4819 if (obj->is_forwarded()) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4820 forwardee = obj->forwardee(); |
526 | 4821 } else { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4822 forwardee = copy_to_survivor_space(obj); |
342 | 4823 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4824 assert(forwardee != NULL, "forwardee should not be NULL"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4825 oopDesc::encode_store_heap_oop(p, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4826 if (do_mark_object && forwardee != obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4827 // If the object is self-forwarded we don't need to explicitly |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4828 // mark it, the evacuation failure protocol will do so. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4829 mark_forwarded_object(obj, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4830 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4831 |
526 | 4832 // When scanning the RS, we only care about objs in CS. |
4833 if (barrier == G1BarrierRS) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4834 _par_scan_state->update_rs(_from, p, _worker_id); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6629
diff
changeset
|
4835 } else if (barrier == G1BarrierKlass) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4836 do_klass_barrier(p, forwardee); |
342 | 4837 } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4838 } else { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4839 // The object is not in collection set. If we're a root scanning |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4840 // closure during an initial mark pause (i.e. do_mark_object will |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4841 // be true) then attempt to mark the object. |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4842 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4843 mark_object(obj); |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4844 } |
526 | 4845 } |
4846 | |
4847 if (barrier == G1BarrierEvac && obj != NULL) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4848 _par_scan_state->update_rs(_from, p, _worker_id); |
526 | 4849 } |
4850 | |
4851 if (do_gen_barrier && obj != NULL) { | |
4852 par_do_barrier(p); | |
4853 } | |
4854 } | |
4855 | |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4856 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4857 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4858 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4859 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4860 assert(has_partial_array_mask(p), "invariant"); |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4861 oop from_obj = clear_partial_array_mask(p); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4862 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4863 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4864 assert(from_obj->is_objArray(), "must be obj array"); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4865 objArrayOop from_obj_array = objArrayOop(from_obj); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4866 // The from-space object contains the real length. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4867 int length = from_obj_array->length(); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4868 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4869 assert(from_obj->is_forwarded(), "must be forwarded"); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4870 oop to_obj = from_obj->forwardee(); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4871 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4872 objArrayOop to_obj_array = objArrayOop(to_obj); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4873 // We keep track of the next start index in the length field of the |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4874 // to-space object. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4875 int next_index = to_obj_array->length(); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4876 assert(0 <= next_index && next_index < length, |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4877 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4878 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4879 int start = next_index; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4880 int end = length; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4881 int remainder = end - start; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4882 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
342 | 4883 if (remainder > 2 * ParGCArrayScanChunk) { |
4884 end = start + ParGCArrayScanChunk; | |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4885 to_obj_array->set_length(end); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4886 // Push the remainder before we process the range in case another |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4887 // worker has run out of things to do and can steal it. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4888 oop* from_obj_p = set_partial_array_mask(from_obj); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4889 _par_scan_state->push_on_queue(from_obj_p); |
342 | 4890 } else { |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4891 assert(length == end, "sanity"); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4892 // We'll process the final range for this object. Restore the length |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4893 // so that the heap remains parsable in case of evacuation failure. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4894 to_obj_array->set_length(end); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4895 } |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4896 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4897 // Process indexes [start,end). It will also process the header |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4898 // along with the first chunk (i.e., the chunk with start == 0). |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4899 // Note that at this point the length field of to_obj_array is not |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4900 // correct given that we are using it to keep track of the next |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4901 // start index. oop_iterate_range() (thankfully!) ignores the length |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4902 // field and only relies on the start / end parameters. It does |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4903 // however return the size of the object which will be incorrect. So |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4904 // we have to ignore it even if we wanted to use it. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4905 to_obj_array->oop_iterate_range(&_scanner, start, end); |
342 | 4906 } |
4907 | |
4908 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4909 protected: | |
4910 G1CollectedHeap* _g1h; | |
4911 G1ParScanThreadState* _par_scan_state; | |
4912 RefToScanQueueSet* _queues; | |
4913 ParallelTaskTerminator* _terminator; | |
4914 | |
4915 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4916 RefToScanQueueSet* queues() { return _queues; } | |
4917 ParallelTaskTerminator* terminator() { return _terminator; } | |
4918 | |
4919 public: | |
4920 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4921 G1ParScanThreadState* par_scan_state, | |
4922 RefToScanQueueSet* queues, | |
4923 ParallelTaskTerminator* terminator) | |
4924 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4925 _queues(queues), _terminator(terminator) {} | |
4926 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4927 void do_void(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4928 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4929 private: |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4930 inline bool offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4931 }; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4932 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4933 bool G1ParEvacuateFollowersClosure::offer_termination() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4934 G1ParScanThreadState* const pss = par_scan_state(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4935 pss->start_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4936 const bool res = terminator()->offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4937 pss->end_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4938 return res; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4939 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4940 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4941 void G1ParEvacuateFollowersClosure::do_void() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4942 StarTask stolen_task; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4943 G1ParScanThreadState* const pss = par_scan_state(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4944 pss->trim_queue(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4945 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4946 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4947 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4948 assert(pss->verify_task(stolen_task), "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4949 if (stolen_task.is_narrow()) { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4950 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4951 } else { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4952 pss->deal_with_reference((oop*) stolen_task); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4953 } |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4954 |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4955 // We've just processed a reference and we might have made |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4956 // available new entries on the queues. So we have to make sure |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4957 // we drain the queues as necessary. |
342 | 4958 pss->trim_queue(); |
4959 } | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4960 } while (!offer_termination()); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4961 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4962 pss->retire_alloc_buffers(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4963 } |
342 | 4964 |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4965 class G1KlassScanClosure : public KlassClosure { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4966 G1ParCopyHelper* _closure; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4967 bool _process_only_dirty; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4968 int _count; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4969 public: |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4970 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4971 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {} |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4972 void do_klass(Klass* klass) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4973 // If the klass has not been dirtied we know that there's |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4974 // no references into the young gen and we can skip it. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4975 if (!_process_only_dirty || klass->has_modified_oops()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4976 // Clean the klass since we're going to scavenge all the metadata. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4977 klass->clear_modified_oops(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4978 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4979 // Tell the closure that this klass is the Klass to scavenge |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4980 // and is the one to dirty if oops are left pointing into the young gen. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4981 _closure->set_scanned_klass(klass); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4982 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4983 klass->oops_do(_closure); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4984 |
da91efe96a93
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4985 _closure->set_scanned_klass(NULL); |
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4986 } |
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4987 _count++; |
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4988 } |
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4989 }; |
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4990 |
342 | 4991 class G1ParTask : public AbstractGangTask { |
4992 protected: | |
4993 G1CollectedHeap* _g1h; | |
4994 RefToScanQueueSet *_queues; | |
4995 ParallelTaskTerminator _terminator; | |
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4996 uint _n_workers; |
342 | 4997 |
4998 Mutex _stats_lock; | |
4999 Mutex* stats_lock() { return &_stats_lock; } | |
5000 | |
5001 size_t getNCards() { | |
5002 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
5003 / G1BlockOffsetSharedArray::N_bytes; | |
5004 } | |
5005 | |
5006 public: | |
4095
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5007 G1ParTask(G1CollectedHeap* g1h, |
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5008 RefToScanQueueSet *task_queues) |
342 | 5009 : AbstractGangTask("G1 collection"), |
5010 _g1h(g1h), | |
5011 _queues(task_queues), | |
4095
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5012 _terminator(0, _queues), |
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5013 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 5014 {} |
5015 | |
5016 RefToScanQueueSet* queues() { return _queues; } | |
5017 | |
5018 RefToScanQueue *work_queue(int i) { | |
5019 return queues()->queue(i); | |
5020 } | |
5021 | |
4095
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5022 ParallelTaskTerminator* terminator() { return &_terminator; } |
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5023 |
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|
5024 virtual void set_for_termination(int active_workers) { |
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5025 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
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5026 // in the young space (_par_seq_tasks) in the G1 heap |
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5027 // for SequentialSubTasksDone. |
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5028 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
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5029 // both of which need setting by set_n_termination(). |
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5030 _g1h->SharedHeap::set_n_termination(active_workers); |
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5031 _g1h->set_n_termination(active_workers); |
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5032 terminator()->reset_for_reuse(active_workers); |
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5033 _n_workers = active_workers; |
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5034 } |
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|
5035 |
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5036 void work(uint worker_id) { |
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5037 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 5038 |
5039 double start_time_ms = os::elapsedTime() * 1000.0; | |
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5040 _g1h->g1_policy()->phase_times()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 5041 |
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5042 { |
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5043 ResourceMark rm; |
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5044 HandleMark hm; |
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5045 |
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5046 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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5047 |
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5048 G1ParScanThreadState pss(_g1h, worker_id); |
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5049 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
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5050 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
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5051 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
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5052 |
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|
5053 pss.set_evac_closure(&scan_evac_cl); |
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5054 pss.set_evac_failure_closure(&evac_failure_cl); |
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5055 pss.set_partial_scan_closure(&partial_scan_cl); |
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5056 |
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|
5057 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
6725
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5058 G1ParScanMetadataClosure only_scan_metadata_cl(_g1h, &pss, rp); |
5986
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5059 |
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5060 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
6725
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5061 G1ParScanAndMarkMetadataClosure scan_mark_metadata_cl(_g1h, &pss, rp); |
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5062 |
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5063 bool only_young = _g1h->g1_policy()->gcs_are_young(); |
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5064 G1KlassScanClosure scan_mark_klasses_cl_s(&scan_mark_metadata_cl, false); |
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5065 G1KlassScanClosure only_scan_klasses_cl_s(&only_scan_metadata_cl, only_young); |
5986
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|
5066 |
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|
5067 OopClosure* scan_root_cl = &only_scan_root_cl; |
6725
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5068 G1KlassScanClosure* scan_klasses_cl = &only_scan_klasses_cl_s; |
5986
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|
5069 |
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|
5070 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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|
5071 // We also need to mark copied objects. |
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|
5072 scan_root_cl = &scan_mark_root_cl; |
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5073 scan_klasses_cl = &scan_mark_klasses_cl_s; |
5986
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|
5074 } |
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|
5075 |
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|
5076 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
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|
5077 |
12080 | 5078 // Don't scan the scavengable methods in the code cache as part |
5079 // of strong root scanning. The code roots that point into a | |
5080 // region in the collection set are scanned when we scan the | |
5081 // region's RSet. | |
5082 int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings; | |
6725
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|
5083 |
5986
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|
5084 pss.start_strong_roots(); |
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|
5085 _g1h->g1_process_strong_roots(/* is scavenging */ true, |
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|
5086 SharedHeap::ScanningOption(so), |
5986
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diff
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|
5087 scan_root_cl, |
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|
5088 &push_heap_rs_cl, |
6725
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|
5089 scan_klasses_cl, |
5986
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|
5090 worker_id); |
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|
5091 pss.end_strong_roots(); |
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|
5092 |
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|
5093 { |
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|
5094 double start = os::elapsedTime(); |
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|
5095 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); |
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|
5096 evac.do_void(); |
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|
5097 double elapsed_ms = (os::elapsedTime()-start)*1000.0; |
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|
5098 double term_ms = pss.term_time()*1000.0; |
6628
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|
5099 _g1h->g1_policy()->phase_times()->add_obj_copy_time(worker_id, elapsed_ms-term_ms); |
6219
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|
5100 _g1h->g1_policy()->phase_times()->record_termination(worker_id, term_ms, pss.term_attempts()); |
5986
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|
5101 } |
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|
5102 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
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|
5103 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
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|
5104 |
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|
5105 if (ParallelGCVerbose) { |
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|
5106 MutexLocker x(stats_lock()); |
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|
5107 pss.print_termination_stats(worker_id); |
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|
5108 } |
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|
5109 |
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|
5110 assert(pss.refs()->is_empty(), "should be empty"); |
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|
5111 |
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|
5112 // Close the inner scope so that the ResourceMark and HandleMark |
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|
5113 // destructors are executed here and are included as part of the |
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|
5114 // "GC Worker Time". |
342 | 5115 } |
5116 | |
1611 | 5117 double end_time_ms = os::elapsedTime() * 1000.0; |
6219
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|
5118 _g1h->g1_policy()->phase_times()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 5119 } |
5120 }; | |
5121 | |
5122 // *** Common G1 Evacuation Stuff | |
5123 | |
1833
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|
5124 // This method is run in a GC worker. |
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|
5125 |
342 | 5126 void |
5127 G1CollectedHeap:: | |
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5128 g1_process_strong_roots(bool is_scavenging, |
4910
caa4652b4414
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|
5129 ScanningOption so, |
342 | 5130 OopClosure* scan_non_heap_roots, |
5131 OopsInHeapRegionClosure* scan_rs, | |
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|
5132 G1KlassScanClosure* scan_klasses, |
342 | 5133 int worker_i) { |
3979
4dfb2df418f2
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|
5134 |
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|
5135 // First scan the strong roots |
342 | 5136 double ext_roots_start = os::elapsedTime(); |
5137 double closure_app_time_sec = 0.0; | |
5138 | |
5139 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
5140 | |
12080 | 5141 assert(so & SO_CodeCache || scan_rs != NULL, "must scan code roots somehow"); |
5142 // Walk the code cache/strong code roots w/o buffering, because StarTask | |
5143 // cannot handle unaligned oop locations. | |
5144 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, true /* do_marking */); | |
989
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|
5145 |
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|
5146 process_strong_roots(false, // no scoping; this is parallel code |
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|
5147 is_scavenging, so, |
342 | 5148 &buf_scan_non_heap_roots, |
989
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|
5149 &eager_scan_code_roots, |
6725
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|
5150 scan_klasses |
da91efe96a93
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|
5151 ); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5152 |
3979
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6484982: G1: process references during evacuation pauses
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|
5153 // Now the CM ref_processor roots. |
3823
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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changeset
|
5154 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
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|
5155 // We need to treat the discovered reference lists of the |
4dfb2df418f2
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changeset
|
5156 // concurrent mark ref processor as roots and keep entries |
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|
5157 // (which are added by the marking threads) on them live |
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|
5158 // until they can be processed at the end of marking. |
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|
5159 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
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|
5160 } |
14a2fd14c0db
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diff
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|
5161 |
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changeset
|
5162 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 5163 buf_scan_non_heap_roots.done(); |
6725
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|
5164 |
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|
5165 double obj_copy_time_sec = buf_scan_non_heap_roots.closure_app_seconds(); |
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|
5166 |
6219
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7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
5167 g1_policy()->phase_times()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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|
5168 |
342 | 5169 double ext_root_time_ms = |
6628
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7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
5170 ((os::elapsedTime() - ext_roots_start) - obj_copy_time_sec) * 1000.0; |
3823
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|
5171 |
6219
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5172 g1_policy()->phase_times()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
342 | 5173 |
4787
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|
5174 // During conc marking we have to filter the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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5175 // to make sure we remove any oops into the CSet (which will show up |
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|
5176 // as implicitly live). |
6628
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|
5177 double satb_filtering_ms = 0.0; |
4787
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|
5178 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
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|
5179 if (mark_in_progress()) { |
6628
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|
5180 double satb_filter_start = os::elapsedTime(); |
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|
5181 |
4787
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changeset
|
5182 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
6628
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|
5183 |
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|
5184 satb_filtering_ms = (os::elapsedTime() - satb_filter_start) * 1000.0; |
4787
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|
5185 } |
2ace1c4ee8da
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diff
changeset
|
5186 } |
6219
922993931b3d
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brutisso
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diff
changeset
|
5187 g1_policy()->phase_times()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
342 | 5188 |
12080 | 5189 // If this is an initial mark pause, and we're not scanning |
5190 // the entire code cache, we need to mark the oops in the | |
5191 // strong code root lists for the regions that are not in | |
5192 // the collection set. | |
5193 // Note all threads participate in this set of root tasks. | |
5194 double mark_strong_code_roots_ms = 0.0; | |
5195 if (g1_policy()->during_initial_mark_pause() && !(so & SO_CodeCache)) { | |
5196 double mark_strong_roots_start = os::elapsedTime(); | |
5197 mark_strong_code_roots(worker_i); | |
5198 mark_strong_code_roots_ms = (os::elapsedTime() - mark_strong_roots_start) * 1000.0; | |
5199 } | |
5200 g1_policy()->phase_times()->record_strong_code_root_mark_time(worker_i, mark_strong_code_roots_ms); | |
5201 | |
342 | 5202 // Now scan the complement of the collection set. |
5203 if (scan_rs != NULL) { | |
12080 | 5204 g1_rem_set()->oops_into_collection_set_do(scan_rs, &eager_scan_code_roots, worker_i); |
342 | 5205 } |
5206 _process_strong_tasks->all_tasks_completed(); | |
5207 } | |
5208 | |
5209 void | |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
10099
diff
changeset
|
5210 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure) { |
989
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|
5211 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
10179
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stefank
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10099
diff
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|
5212 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs); |
342 | 5213 } |
5214 | |
3979
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|
5215 // Weak Reference Processing support |
4dfb2df418f2
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diff
changeset
|
5216 |
4dfb2df418f2
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changeset
|
5217 // An always "is_alive" closure that is used to preserve referents. |
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changeset
|
5218 // If the object is non-null then it's alive. Used in the preservation |
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diff
changeset
|
5219 // of referent objects that are pointed to by reference objects |
4dfb2df418f2
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diff
changeset
|
5220 // discovered by the CM ref processor. |
4dfb2df418f2
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diff
changeset
|
5221 class G1AlwaysAliveClosure: public BoolObjectClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5222 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5223 public: |
4dfb2df418f2
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diff
changeset
|
5224 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
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diff
changeset
|
5225 bool do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5226 if (p != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5227 return true; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5228 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5229 return false; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5230 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
changeset
|
5231 }; |
4dfb2df418f2
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diff
changeset
|
5232 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5233 bool G1STWIsAliveClosure::do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5234 // An object is reachable if it is outside the collection set, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5235 // or is inside and copied. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5236 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5237 } |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5238 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 // Non Copying Keep Alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 class G1KeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5242 public: |
4dfb2df418f2
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diff
changeset
|
5243 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
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diff
changeset
|
5244 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5245 void do_oop( oop* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 oop obj = *p; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5247 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5248 if (_g1->obj_in_cs(obj)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5249 assert( obj->is_forwarded(), "invariant" ); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 *p = obj->forwardee(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
5252 } |
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5253 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5254 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5255 // Copying Keep Alive closure - can be called from both |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5256 // serial and parallel code as long as different worker |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 // threads utilize different G1ParScanThreadState instances |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 // and different queues. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5259 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5260 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5261 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5262 OopClosure* _copy_non_heap_obj_cl; |
6725
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coleenp
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6629
diff
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|
5263 OopsInHeapRegionClosure* _copy_metadata_obj_cl; |
3979
4dfb2df418f2
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diff
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|
5264 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5265 |
4dfb2df418f2
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diff
changeset
|
5266 public: |
4dfb2df418f2
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diff
changeset
|
5267 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
4dfb2df418f2
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3973
diff
changeset
|
5268 OopClosure* non_heap_obj_cl, |
6725
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coleenp
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6629
diff
changeset
|
5269 OopsInHeapRegionClosure* metadata_obj_cl, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 G1ParScanThreadState* pss): |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5272 _copy_non_heap_obj_cl(non_heap_obj_cl), |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5273 _copy_metadata_obj_cl(metadata_obj_cl), |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5276 |
4dfb2df418f2
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3973
diff
changeset
|
5277 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5278 virtual void do_oop( oop* p) { do_oop_work(p); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5279 |
4dfb2df418f2
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3973
diff
changeset
|
5280 template <class T> void do_oop_work(T* p) { |
4dfb2df418f2
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3973
diff
changeset
|
5281 oop obj = oopDesc::load_decode_heap_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5282 |
4dfb2df418f2
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diff
changeset
|
5283 if (_g1h->obj_in_cs(obj)) { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5284 // If the referent object has been forwarded (either copied |
4dfb2df418f2
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3973
diff
changeset
|
5285 // to a new location or to itself in the event of an |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5286 // evacuation failure) then we need to update the reference |
4dfb2df418f2
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3973
diff
changeset
|
5287 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5288 // heap, update the RSet for the referent. |
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|
5289 // |
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|
5290 // If the referent has not been forwarded then we have to keep |
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|
5291 // it alive by policy. Therefore we have copy the referent. |
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|
5292 // |
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|
5293 // If the reference field is in the G1 heap then we can push |
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|
5294 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
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diff
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|
5295 // phase of reference processing) the object and it's followers |
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|
5296 // will be copied, the reference field set to point to the |
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|
5297 // new location, and the RSet updated. Otherwise we need to |
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|
5298 // use the the non-heap or metadata closures directly to copy |
10405 | 5299 // the referent object and update the pointer, while avoiding |
3979
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|
5300 // updating the RSet. |
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diff
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|
5301 |
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|
5302 if (_g1h->is_in_g1_reserved(p)) { |
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|
5303 _par_scan_state->push_on_queue(p); |
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|
5304 } else { |
6725
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|
5305 assert(!ClassLoaderDataGraph::contains((address)p), |
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5306 err_msg("Otherwise need to call _copy_metadata_obj_cl->do_oop(p) " |
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5307 PTR_FORMAT, p)); |
3979
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|
5308 _copy_non_heap_obj_cl->do_oop(p); |
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|
5309 } |
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|
5310 } |
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|
5311 } |
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|
5312 }; |
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|
5313 |
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|
5314 // Serial drain queue closure. Called as the 'complete_gc' |
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|
5315 // closure for each discovered list in some of the |
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|
5316 // reference processing phases. |
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|
5317 |
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|
5318 class G1STWDrainQueueClosure: public VoidClosure { |
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|
5319 protected: |
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|
5320 G1CollectedHeap* _g1h; |
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|
5321 G1ParScanThreadState* _par_scan_state; |
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|
5322 |
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|
5323 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
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|
5324 |
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|
5325 public: |
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|
5326 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
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|
5327 _g1h(g1h), |
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|
5328 _par_scan_state(pss) |
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|
5329 { } |
4dfb2df418f2
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|
5330 |
4dfb2df418f2
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|
5331 void do_void() { |
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|
5332 G1ParScanThreadState* const pss = par_scan_state(); |
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|
5333 pss->trim_queue(); |
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|
5334 } |
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|
5335 }; |
4dfb2df418f2
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|
5336 |
4dfb2df418f2
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|
5337 // Parallel Reference Processing closures |
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parents:
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|
5338 |
4dfb2df418f2
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|
5339 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
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parents:
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|
5340 // processing during G1 evacuation pauses. |
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parents:
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diff
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|
5341 |
4dfb2df418f2
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|
5342 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
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|
5343 private: |
4dfb2df418f2
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diff
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|
5344 G1CollectedHeap* _g1h; |
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|
5345 RefToScanQueueSet* _queues; |
4095
bca17e38de00
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|
5346 FlexibleWorkGang* _workers; |
3979
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|
5347 int _active_workers; |
4dfb2df418f2
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parents:
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diff
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|
5348 |
4dfb2df418f2
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diff
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|
5349 public: |
4dfb2df418f2
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diff
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|
5350 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
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|
5351 FlexibleWorkGang* workers, |
3979
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diff
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|
5352 RefToScanQueueSet *task_queues, |
4dfb2df418f2
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diff
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|
5353 int n_workers) : |
4dfb2df418f2
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diff
changeset
|
5354 _g1h(g1h), |
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diff
changeset
|
5355 _queues(task_queues), |
4dfb2df418f2
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parents:
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diff
changeset
|
5356 _workers(workers), |
4dfb2df418f2
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parents:
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diff
changeset
|
5357 _active_workers(n_workers) |
4dfb2df418f2
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parents:
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diff
changeset
|
5358 { |
4dfb2df418f2
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parents:
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diff
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|
5359 assert(n_workers > 0, "shouldn't call this otherwise"); |
4dfb2df418f2
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parents:
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diff
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|
5360 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5361 |
4dfb2df418f2
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parents:
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diff
changeset
|
5362 // Executes the given task using concurrent marking worker threads. |
4dfb2df418f2
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parents:
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diff
changeset
|
5363 virtual void execute(ProcessTask& task); |
4dfb2df418f2
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parents:
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diff
changeset
|
5364 virtual void execute(EnqueueTask& task); |
4dfb2df418f2
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parents:
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diff
changeset
|
5365 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
5366 |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5367 // Gang task for possibly parallel reference processing |
4dfb2df418f2
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parents:
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diff
changeset
|
5368 |
4dfb2df418f2
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parents:
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diff
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|
5369 class G1STWRefProcTaskProxy: public AbstractGangTask { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
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|
5370 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5371 ProcessTask& _proc_task; |
4dfb2df418f2
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parents:
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diff
changeset
|
5372 G1CollectedHeap* _g1h; |
4dfb2df418f2
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parents:
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diff
changeset
|
5373 RefToScanQueueSet *_task_queues; |
4dfb2df418f2
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parents:
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diff
changeset
|
5374 ParallelTaskTerminator* _terminator; |
4dfb2df418f2
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parents:
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diff
changeset
|
5375 |
4dfb2df418f2
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parents:
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diff
changeset
|
5376 public: |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5377 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
4dfb2df418f2
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parents:
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diff
changeset
|
5378 G1CollectedHeap* g1h, |
4dfb2df418f2
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parents:
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diff
changeset
|
5379 RefToScanQueueSet *task_queues, |
4dfb2df418f2
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parents:
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diff
changeset
|
5380 ParallelTaskTerminator* terminator) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5381 AbstractGangTask("Process reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5382 _proc_task(proc_task), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5383 _g1h(g1h), |
4dfb2df418f2
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parents:
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diff
changeset
|
5384 _task_queues(task_queues), |
4dfb2df418f2
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parents:
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diff
changeset
|
5385 _terminator(terminator) |
4dfb2df418f2
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parents:
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diff
changeset
|
5386 {} |
4dfb2df418f2
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diff
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|
5387 |
4728
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jmasa
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|
5388 virtual void work(uint worker_id) { |
3979
4dfb2df418f2
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parents:
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diff
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|
5389 // The reference processing task executed by a single worker. |
4dfb2df418f2
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parents:
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diff
changeset
|
5390 ResourceMark rm; |
4dfb2df418f2
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parents:
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diff
changeset
|
5391 HandleMark hm; |
4dfb2df418f2
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diff
changeset
|
5392 |
4dfb2df418f2
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diff
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|
5393 G1STWIsAliveClosure is_alive(_g1h); |
4dfb2df418f2
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diff
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|
5394 |
4728
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jmasa
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diff
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|
5395 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
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diff
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|
5396 |
4dfb2df418f2
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diff
changeset
|
5397 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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diff
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|
5398 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5399 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5400 |
4dfb2df418f2
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diff
changeset
|
5401 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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diff
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|
5402 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
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diff
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|
5403 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
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|
5404 |
4dfb2df418f2
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diff
changeset
|
5405 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
6725
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coleenp
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|
5406 G1ParScanMetadataClosure only_copy_metadata_cl(_g1h, &pss, NULL); |
3979
4dfb2df418f2
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diff
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|
5407 |
4dfb2df418f2
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diff
changeset
|
5408 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
6725
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coleenp
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|
5409 G1ParScanAndMarkMetadataClosure copy_mark_metadata_cl(_g1h, &pss, NULL); |
3979
4dfb2df418f2
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|
5410 |
4dfb2df418f2
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diff
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|
5411 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
6725
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coleenp
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|
5412 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
4dfb2df418f2
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|
5413 |
4dfb2df418f2
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diff
changeset
|
5414 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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parents:
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diff
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|
5415 // We also need to mark copied objects. |
4dfb2df418f2
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3973
diff
changeset
|
5416 copy_non_heap_cl = ©_mark_non_heap_cl; |
6725
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|
5417 copy_metadata_cl = ©_mark_metadata_cl; |
3979
4dfb2df418f2
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parents:
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diff
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|
5418 } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5419 |
4dfb2df418f2
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diff
changeset
|
5420 // Keep alive closure. |
6725
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coleenp
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diff
changeset
|
5421 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_metadata_cl, &pss); |
3979
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|
5422 |
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|
5423 // Complete GC closure |
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|
5424 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
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|
5425 |
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|
5426 // Call the reference processing task's work routine. |
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5427 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
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|
5428 |
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|
5429 // Note we cannot assert that the refs array is empty here as not all |
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|
5430 // of the processing tasks (specifically phase2 - pp2_work) execute |
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|
5431 // the complete_gc closure (which ordinarily would drain the queue) so |
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|
5432 // the queue may not be empty. |
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|
5433 } |
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|
5434 }; |
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|
5435 |
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|
5436 // Driver routine for parallel reference processing. |
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|
5437 // Creates an instance of the ref processing gang |
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|
5438 // task and has the worker threads execute it. |
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|
5439 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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|
5440 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5441 |
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|
5442 ParallelTaskTerminator terminator(_active_workers, _queues); |
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5443 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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|
5444 |
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|
5445 _g1h->set_par_threads(_active_workers); |
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|
5446 _workers->run_task(&proc_task_proxy); |
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|
5447 _g1h->set_par_threads(0); |
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|
5448 } |
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|
5449 |
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|
5450 // Gang task for parallel reference enqueueing. |
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|
5451 |
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|
5452 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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5453 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
5454 EnqueueTask& _enq_task; |
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|
5455 |
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|
5456 public: |
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|
5457 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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|
5458 AbstractGangTask("Enqueue reference objects in parallel"), |
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changeset
|
5459 _enq_task(enq_task) |
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|
5460 { } |
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|
5461 |
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|
5462 virtual void work(uint worker_id) { |
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|
5463 _enq_task.work(worker_id); |
3979
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|
5464 } |
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|
5465 }; |
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|
5466 |
10405 | 5467 // Driver routine for parallel reference enqueueing. |
3979
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|
5468 // Creates an instance of the ref enqueueing gang |
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|
5469 // task and has the worker threads execute it. |
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changeset
|
5470 |
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|
5471 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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|
5472 assert(_workers != NULL, "Need parallel worker threads."); |
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changeset
|
5473 |
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|
5474 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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|
5475 |
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|
5476 _g1h->set_par_threads(_active_workers); |
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|
5477 _workers->run_task(&enq_task_proxy); |
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|
5478 _g1h->set_par_threads(0); |
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|
5479 } |
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diff
changeset
|
5480 |
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diff
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|
5481 // End of weak reference support closures |
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diff
changeset
|
5482 |
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|
5483 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5484 // that are in the collection set and are pointed to by reference |
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|
5485 // objects discovered by the CM ref processor. |
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diff
changeset
|
5486 |
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diff
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|
5487 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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changeset
|
5488 protected: |
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diff
changeset
|
5489 G1CollectedHeap* _g1h; |
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diff
changeset
|
5490 RefToScanQueueSet *_queues; |
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|
5491 ParallelTaskTerminator _terminator; |
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|
5492 uint _n_workers; |
3979
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diff
changeset
|
5493 |
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diff
changeset
|
5494 public: |
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diff
changeset
|
5495 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
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|
5496 AbstractGangTask("ParPreserveCMReferents"), |
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diff
changeset
|
5497 _g1h(g1h), |
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diff
changeset
|
5498 _queues(task_queues), |
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diff
changeset
|
5499 _terminator(workers, _queues), |
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parents:
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diff
changeset
|
5500 _n_workers(workers) |
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diff
changeset
|
5501 { } |
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diff
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|
5502 |
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|
5503 void work(uint worker_id) { |
3979
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changeset
|
5504 ResourceMark rm; |
4dfb2df418f2
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diff
changeset
|
5505 HandleMark hm; |
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diff
changeset
|
5506 |
4728
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diff
changeset
|
5507 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5508 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5509 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5510 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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changeset
|
5511 |
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6484982: G1: process references during evacuation pauses
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diff
changeset
|
5512 pss.set_evac_closure(&scan_evac_cl); |
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diff
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|
5513 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5514 pss.set_partial_scan_closure(&partial_scan_cl); |
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changeset
|
5515 |
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diff
changeset
|
5516 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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changeset
|
5517 |
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diff
changeset
|
5518 |
4dfb2df418f2
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diff
changeset
|
5519 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
6725
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diff
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|
5520 G1ParScanMetadataClosure only_copy_metadata_cl(_g1h, &pss, NULL); |
3979
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|
5521 |
4dfb2df418f2
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diff
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|
5522 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
6725
da91efe96a93
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coleenp
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diff
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|
5523 G1ParScanAndMarkMetadataClosure copy_mark_metadata_cl(_g1h, &pss, NULL); |
3979
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|
5524 |
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diff
changeset
|
5525 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
6725
da91efe96a93
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diff
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|
5526 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
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|
5527 |
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diff
changeset
|
5528 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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diff
changeset
|
5529 // We also need to mark copied objects. |
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diff
changeset
|
5530 copy_non_heap_cl = ©_mark_non_heap_cl; |
6725
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|
5531 copy_metadata_cl = ©_mark_metadata_cl; |
3979
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changeset
|
5532 } |
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diff
changeset
|
5533 |
4dfb2df418f2
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diff
changeset
|
5534 // Is alive closure |
4dfb2df418f2
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diff
changeset
|
5535 G1AlwaysAliveClosure always_alive(_g1h); |
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changeset
|
5536 |
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diff
changeset
|
5537 // Copying keep alive closure. Applied to referent objects that need |
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diff
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|
5538 // to be copied. |
6725
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diff
changeset
|
5539 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_metadata_cl, &pss); |
3979
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|
5540 |
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diff
changeset
|
5541 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
5542 |
4728
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diff
changeset
|
5543 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
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|
5544 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
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changeset
|
5545 |
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diff
changeset
|
5546 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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diff
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|
5547 // So this must be true - but assert just in case someone decides to |
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diff
changeset
|
5548 // change the worker ids. |
4728
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diff
changeset
|
5549 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
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changeset
|
5550 assert(!rp->discovery_is_atomic(), "check this code"); |
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diff
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|
5551 |
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diff
changeset
|
5552 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5553 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
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parents:
4013
diff
changeset
|
5554 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
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diff
changeset
|
5555 |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5556 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5557 while (iter.has_next()) { |
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parents:
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diff
changeset
|
5558 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5559 // can see some null referent objects. |
4dfb2df418f2
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parents:
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diff
changeset
|
5560 iter.load_ptrs(DEBUG_ONLY(true)); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5561 oop ref = iter.obj(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5562 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5563 // This will filter nulls. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5564 if (iter.is_referent_alive()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5565 iter.make_referent_alive(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5566 } |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5567 iter.move_to_next(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5568 } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5569 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5570 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5571 // Drain the queue - which may cause stealing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5572 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
4dfb2df418f2
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parents:
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diff
changeset
|
5573 drain_queue.do_void(); |
4dfb2df418f2
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parents:
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diff
changeset
|
5574 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5575 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5576 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5577 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
5578 |
4dfb2df418f2
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parents:
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diff
changeset
|
5579 // Weak Reference processing during an evacuation pause (part 1). |
6819 | 5580 void G1CollectedHeap::process_discovered_references(uint no_of_gc_workers) { |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5581 double ref_proc_start = os::elapsedTime(); |
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parents:
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diff
changeset
|
5582 |
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parents:
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diff
changeset
|
5583 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
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parents:
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diff
changeset
|
5584 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
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parents:
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diff
changeset
|
5585 |
4dfb2df418f2
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parents:
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diff
changeset
|
5586 // Any reference objects, in the collection set, that were 'discovered' |
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parents:
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diff
changeset
|
5587 // by the CM ref processor should have already been copied (either by |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5588 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5589 // by following an RSet entry). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5590 // |
4dfb2df418f2
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parents:
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diff
changeset
|
5591 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5592 // reference objects point to may not have been copied: the STW ref |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5593 // processor would have seen that the reference object had already |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5594 // been 'discovered' and would have skipped discovering the reference, |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5595 // but would not have treated the reference object as a regular oop. |
10405 | 5596 // As a result the copy closure would not have been applied to the |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5597 // referent object. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5598 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5599 // We need to explicitly copy these referent objects - the references |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5600 // will be processed at the end of remarking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5601 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5602 // We also need to do this copying before we process the reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5603 // objects discovered by the STW ref processor in case one of these |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5604 // referents points to another object which is also referenced by an |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5605 // object discovered by the STW ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5606 |
4711 | 5607 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
6819 | 5608 no_of_gc_workers == workers()->active_workers(), |
5609 "Need to reset active GC workers"); | |
5610 | |
5611 set_par_threads(no_of_gc_workers); | |
5612 G1ParPreserveCMReferentsTask keep_cm_referents(this, | |
5613 no_of_gc_workers, | |
5614 _task_queues); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5615 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5616 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5617 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5618 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5619 keep_cm_referents.work(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5620 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5621 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5622 set_par_threads(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5623 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5624 // Closure to test whether a referent is alive. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5625 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5626 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5627 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5628 // of JNI refs is serial and performed serially by the current thread |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5629 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5630 // JNI refs. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5631 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5632 // Use only a single queue for this PSS. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5633 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5634 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5635 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5636 // closures while we're actually processing the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5637 // reference objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5638 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5639 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5640 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5641 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5642 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5643 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5644 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5645 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5646 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5647 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5648 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5649 G1ParScanMetadataClosure only_copy_metadata_cl(this, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5650 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5651 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5652 G1ParScanAndMarkMetadataClosure copy_mark_metadata_cl(this, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5653 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5654 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5655 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5656 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5657 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5658 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5659 copy_non_heap_cl = ©_mark_non_heap_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5660 copy_metadata_cl = ©_mark_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5661 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5662 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5663 // Keep alive closure. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5664 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_metadata_cl, &pss); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5665 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5666 // Serial Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5667 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5668 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5669 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5670 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5671 |
10405 | 5672 ReferenceProcessorStats stats; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5673 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5674 // Serial reference processing... |
10405 | 5675 stats = rp->process_discovered_references(&is_alive, |
5676 &keep_alive, | |
5677 &drain_queue, | |
5678 NULL, | |
5679 _gc_timer_stw); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5680 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5681 // Parallel reference processing |
6819 | 5682 assert(rp->num_q() == no_of_gc_workers, "sanity"); |
5683 assert(no_of_gc_workers <= rp->max_num_q(), "sanity"); | |
5684 | |
5685 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, no_of_gc_workers); | |
10405 | 5686 stats = rp->process_discovered_references(&is_alive, |
5687 &keep_alive, | |
5688 &drain_queue, | |
5689 &par_task_executor, | |
5690 _gc_timer_stw); | |
5691 } | |
5692 | |
5693 _gc_tracer_stw->report_gc_reference_stats(stats); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5694 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5695 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5696 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5697 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5698 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5699 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5700 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6188
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|
5701 g1_policy()->phase_times()->record_ref_proc_time(ref_proc_time * 1000.0); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5702 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5703 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5704 // Weak Reference processing during an evacuation pause (part 2). |
6819 | 5705 void G1CollectedHeap::enqueue_discovered_references(uint no_of_gc_workers) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5706 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5707 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5708 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5709 assert(!rp->discovery_enabled(), "should have been disabled as part of processing"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5710 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5711 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5712 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5713 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5714 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5715 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5716 } else { |
10405 | 5717 // Parallel reference enqueueing |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5718 |
6819 | 5719 assert(no_of_gc_workers == workers()->active_workers(), |
5720 "Need to reset active workers"); | |
5721 assert(rp->num_q() == no_of_gc_workers, "sanity"); | |
5722 assert(no_of_gc_workers <= rp->max_num_q(), "sanity"); | |
5723 | |
5724 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, no_of_gc_workers); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5725 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5726 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5727 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5728 rp->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5729 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5730 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5731 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5732 // CM's reference processing also cleans up the string and symbol tables. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5733 // Should we do that here also? We could, but it is a serial operation |
10405 | 5734 // and could significantly increase the pause time. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5735 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5736 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5737 g1_policy()->phase_times()->record_ref_enq_time(ref_enq_time * 1000.0); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5738 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5739 |
10405 | 5740 void G1CollectedHeap::evacuate_collection_set(EvacuationInfo& evacuation_info) { |
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5741 _expand_heap_after_alloc_failure = true; |
10405 | 5742 _evacuation_failed = false; |
342 | 5743 |
6629
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5744 // Should G1EvacuationFailureALot be in effect for this GC? |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5745 NOT_PRODUCT(set_evacuation_failure_alot_for_current_gc();) |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5746 |
342 | 5747 g1_rem_set()->prepare_for_oops_into_collection_set_do(); |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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parents:
10242
diff
changeset
|
5748 |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5749 // Disable the hot card cache. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5750 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5751 hot_card_cache->reset_hot_cache_claimed_index(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5752 hot_card_cache->set_use_cache(false); |
889 | 5753 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5754 uint n_workers; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5755 if (G1CollectedHeap::use_parallel_gc_threads()) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5756 n_workers = |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5757 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5758 workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5759 Threads::number_of_non_daemon_threads()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5760 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5761 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5762 "If not dynamic should be using all the workers"); |
4711 | 5763 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5764 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5765 } else { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5766 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5767 "Should be the original non-parallel value"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5768 n_workers = 1; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5769 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5770 |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5771 G1ParTask g1_par_task(this, _task_queues); |
342 | 5772 |
5773 init_for_evac_failure(NULL); | |
5774 | |
5775 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5776 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5777 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5778 double start_par_time_sec = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5779 double end_par_time_sec; |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5780 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5781 { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5782 StrongRootsScope srs(this); |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5783 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5784 if (G1CollectedHeap::use_parallel_gc_threads()) { |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5785 // The individual threads will set their evac-failure closures. |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5786 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5787 // These tasks use ShareHeap::_process_strong_tasks |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5788 assert(UseDynamicNumberOfGCThreads || |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5789 workers()->active_workers() == workers()->total_workers(), |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5790 "If not dynamic should be using all the workers"); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5791 workers()->run_task(&g1_par_task); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5792 } else { |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5793 g1_par_task.set_for_termination(n_workers); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5794 g1_par_task.work(0); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5795 } |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5796 end_par_time_sec = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5797 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5798 // Closing the inner scope will execute the destructor |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5799 // for the StrongRootsScope object. We record the current |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5800 // elapsed time before closing the scope so that time |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5801 // taken for the SRS destructor is NOT included in the |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5802 // reported parallel time. |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5803 } |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5804 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5805 double par_time_ms = (end_par_time_sec - start_par_time_sec) * 1000.0; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5806 g1_policy()->phase_times()->record_par_time(par_time_ms); |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5807 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5808 double code_root_fixup_time_ms = |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5809 (os::elapsedTime() - end_par_time_sec) * 1000.0; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5810 g1_policy()->phase_times()->record_code_root_fixup_time(code_root_fixup_time_ms); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5811 |
342 | 5812 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5813 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5814 // Process any discovered reference objects - we have |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5815 // to do this _before_ we retire the GC alloc regions |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5816 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5817 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5818 // not copied during the pause. |
6819 | 5819 process_discovered_references(n_workers); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5820 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5821 // Weak root processing. |
342 | 5822 { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5823 G1STWIsAliveClosure is_alive(this); |
342 | 5824 G1KeepAliveClosure keep_alive(this); |
5825 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5826 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5827 |
10405 | 5828 release_gc_alloc_regions(n_workers, evacuation_info); |
342 | 5829 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5830 |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5831 // Reset and re-enable the hot card cache. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5832 // Note the counts for the cards in the regions in the |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5833 // collection set are reset when the collection set is freed. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5834 hot_card_cache->reset_hot_cache(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5835 hot_card_cache->set_use_cache(true); |
342 | 5836 |
12080 | 5837 // Migrate the strong code roots attached to each region in |
5838 // the collection set. Ideally we would like to do this | |
5839 // after we have finished the scanning/evacuation of the | |
5840 // strong code roots for a particular heap region. | |
5841 migrate_strong_code_roots(); | |
5842 | |
5843 if (g1_policy()->during_initial_mark_pause()) { | |
5844 // Reset the claim values set during marking the strong code roots | |
5845 reset_heap_region_claim_values(); | |
5846 } | |
5847 | |
342 | 5848 finalize_for_evac_failure(); |
5849 | |
5850 if (evacuation_failed()) { | |
5851 remove_self_forwarding_pointers(); | |
6629
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5852 |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5853 // Reset the G1EvacuationFailureALot counters and flags |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5854 // Note: the values are reset only when an actual |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
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|
5855 // evacuation failure occurs. |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
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6628
diff
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|
5856 NOT_PRODUCT(reset_evacuation_should_fail();) |
342 | 5857 } |
5858 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5859 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5860 // reference processor's discovered lists. We need to do |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5861 // this after the card table is cleaned (and verified) as |
10405 | 5862 // the act of enqueueing entries on to the pending list |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5863 // will log these updates (and dirty their associated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5864 // cards). We need these updates logged to update any |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5865 // RSets. |
6819 | 5866 enqueue_discovered_references(n_workers); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5867 |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5868 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5869 RedirtyLoggedCardTableEntryFastClosure redirty; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
5870 dirty_card_queue_set().set_closure(&redirty); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5871 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5872 |
5873 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5874 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5875 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
5876 } |
342 | 5877 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5878 } | |
5879 | |
2173 | 5880 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5881 size_t* pre_used, |
5882 FreeRegionList* free_list, | |
4072 | 5883 OldRegionSet* old_proxy_set, |
2152 | 5884 HumongousRegionSet* humongous_proxy_set, |
2173 | 5885 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5886 bool par) { |
5887 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5888 if (hr->isHumongous()) { | |
5889 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5890 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5891 } else { | |
4072 | 5892 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5893 free_region(hr, pre_used, free_list, par); |
342 | 5894 } |
2173 | 5895 } else { |
5896 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5897 } |
5898 } | |
5899 | |
2152 | 5900 void G1CollectedHeap::free_region(HeapRegion* hr, |
5901 size_t* pre_used, | |
5902 FreeRegionList* free_list, | |
5903 bool par) { | |
5904 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5905 assert(!hr->is_empty(), "the region should not be empty"); | |
5906 assert(free_list != NULL, "pre-condition"); | |
5907 | |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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diff
changeset
|
5908 // Clear the card counts for this region. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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10242
diff
changeset
|
5909 // Note: we only need to do this if the region is not young |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
5910 // (since we don't refine cards in young regions). |
194f52aa2f23
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|
5911 if (!hr->is_young()) { |
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|
5912 _cg1r->hot_card_cache()->reset_card_counts(hr); |
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johnc
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diff
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|
5913 } |
2152 | 5914 *pre_used += hr->used(); |
5915 hr->hr_clear(par, true /* clear_space */); | |
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
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|
5916 free_list->add_as_head(hr); |
2152 | 5917 } |
5918 | |
5919 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5920 size_t* pre_used, | |
5921 FreeRegionList* free_list, | |
5922 HumongousRegionSet* humongous_proxy_set, | |
5923 bool par) { | |
5924 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5925 assert(free_list != NULL, "pre-condition"); | |
5926 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5927 | |
5928 size_t hr_used = hr->used(); | |
5929 size_t hr_capacity = hr->capacity(); | |
5930 size_t hr_pre_used = 0; | |
5931 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
6254
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
5932 // We need to read this before we make the region non-humongous, |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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|
5933 // otherwise the information will be gone. |
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7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
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diff
changeset
|
5934 uint last_index = hr->last_hc_index(); |
2152 | 5935 hr->set_notHumongous(); |
5936 free_region(hr, &hr_pre_used, free_list, par); | |
5937 | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5938 uint i = hr->hrs_index() + 1; |
6254
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7114678: G1: various small fixes, code cleanup, and refactoring
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diff
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|
5939 while (i < last_index) { |
3766 | 5940 HeapRegion* curr_hr = region_at(i); |
6254
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7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
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diff
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|
5941 assert(curr_hr->continuesHumongous(), "invariant"); |
2152 | 5942 curr_hr->set_notHumongous(); |
5943 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5944 i += 1; | |
5945 } | |
5946 assert(hr_pre_used == hr_used, | |
5947 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5948 "should be the same", hr_pre_used, hr_used)); | |
5949 *pre_used += hr_pre_used; | |
5950 } | |
5951 | |
5952 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5953 FreeRegionList* free_list, | |
4072 | 5954 OldRegionSet* old_proxy_set, |
2152 | 5955 HumongousRegionSet* humongous_proxy_set, |
5956 bool par) { | |
5957 if (pre_used > 0) { | |
5958 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5959 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5960 assert(_summary_bytes_used >= pre_used, |
5961 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5962 "should be >= pre_used: "SIZE_FORMAT, | |
5963 _summary_bytes_used, pre_used)); | |
342 | 5964 _summary_bytes_used -= pre_used; |
2152 | 5965 } |
5966 if (free_list != NULL && !free_list->is_empty()) { | |
5967 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
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2369
diff
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|
5968 _free_list.add_as_head(free_list); |
2152 | 5969 } |
4072 | 5970 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5971 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5972 _old_set.update_from_proxy(old_proxy_set); | |
5973 } | |
2152 | 5974 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5975 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5976 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5977 } |
5978 } | |
5979 | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5980 class G1ParCleanupCTTask : public AbstractGangTask { |
12343 | 5981 G1SATBCardTableModRefBS* _ct_bs; |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
5982 G1CollectedHeap* _g1h; |
940
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6841313: G1: dirty cards of survivor regions in parallel
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diff
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|
5983 HeapRegion* volatile _su_head; |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
5984 public: |
12343 | 5985 G1ParCleanupCTTask(G1SATBCardTableModRefBS* ct_bs, |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5986 G1CollectedHeap* g1h) : |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5987 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5988 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
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diff
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|
5989 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5990 void work(uint worker_id) { |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5991 HeapRegion* r; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
5992 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5993 clear_cards(r); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5994 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5995 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5996 |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5997 void clear_cards(HeapRegion* r) { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5998 // Cards of the survivors should have already been dirtied. |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5999 if (!r->is_survivor()) { |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
6000 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
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|
6001 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
6002 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
6003 }; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
6004 |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6005 #ifndef PRODUCT |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
6006 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
6007 G1CollectedHeap* _g1h; |
12343 | 6008 G1SATBCardTableModRefBS* _ct_bs; |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6009 public: |
12343 | 6010 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, G1SATBCardTableModRefBS* ct_bs) |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
6011 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6012 virtual bool doHeapRegion(HeapRegion* r) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
6013 if (r->is_survivor()) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
6014 _g1h->verify_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
6015 } else { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
6016 _g1h->verify_not_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6017 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6018 return false; |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6019 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6020 }; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
6021 |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
6022 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
6023 // All of the region should be clean. |
12343 | 6024 G1SATBCardTableModRefBS* ct_bs = g1_barrier_set(); |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6025 MemRegion mr(hr->bottom(), hr->end()); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6026 ct_bs->verify_not_dirty_region(mr); |
063382f9b575
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|
6027 } |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6028 |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
6029 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6030 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
063382f9b575
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diff
changeset
|
6031 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
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diff
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|
6032 // retires each region and replaces it with a new one will do a |
063382f9b575
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diff
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|
6033 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
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diff
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|
6034 // not dirty that area (one less thing to have to do while holding |
063382f9b575
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diff
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|
6035 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
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diff
changeset
|
6036 // is dirty. |
12343 | 6037 G1SATBCardTableModRefBS* ct_bs = g1_barrier_set(); |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
6038 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
12835
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
parents:
12345
diff
changeset
|
6039 if (hr->is_young()) { |
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
parents:
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diff
changeset
|
6040 ct_bs->verify_g1_young_region(mr); |
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
parents:
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diff
changeset
|
6041 } else { |
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
parents:
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diff
changeset
|
6042 ct_bs->verify_dirty_region(mr); |
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
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diff
changeset
|
6043 } |
3317
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|
6044 } |
063382f9b575
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|
6045 |
2433
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2432
diff
changeset
|
6046 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
12343 | 6047 G1SATBCardTableModRefBS* ct_bs = g1_barrier_set(); |
2433
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6048 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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6049 verify_dirty_region(hr); |
2433
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6050 } |
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6051 } |
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6052 |
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6053 void G1CollectedHeap::verify_dirty_young_regions() { |
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6054 verify_dirty_young_list(_young_list->first_region()); |
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6055 } |
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|
6056 #endif |
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6057 |
342 | 6058 void G1CollectedHeap::cleanUpCardTable() { |
12343 | 6059 G1SATBCardTableModRefBS* ct_bs = g1_barrier_set(); |
342 | 6060 double start = os::elapsedTime(); |
6061 | |
4023 | 6062 { |
6063 // Iterate over the dirty cards region list. | |
6064 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
6065 | |
4711 | 6066 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6067 set_par_threads(); | |
4023 | 6068 workers()->run_task(&cleanup_task); |
6069 set_par_threads(0); | |
6070 } else { | |
6071 while (_dirty_cards_region_list) { | |
6072 HeapRegion* r = _dirty_cards_region_list; | |
6073 cleanup_task.clear_cards(r); | |
6074 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
6075 if (_dirty_cards_region_list == r) { | |
6076 // The last region. | |
6077 _dirty_cards_region_list = NULL; | |
6078 } | |
6079 r->set_next_dirty_cards_region(NULL); | |
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6080 } |
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6081 } |
4023 | 6082 #ifndef PRODUCT |
6083 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
6084 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
6085 heap_region_iterate(&cleanup_verifier); | |
6086 } | |
6087 #endif | |
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6088 } |
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6089 |
342 | 6090 double elapsed = os::elapsedTime() - start; |
6219
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6091 g1_policy()->phase_times()->record_clear_ct_time(elapsed * 1000.0); |
342 | 6092 } |
6093 | |
10405 | 6094 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info) { |
2152 | 6095 size_t pre_used = 0; |
6096 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
6097 | |
342 | 6098 double young_time_ms = 0.0; |
6099 double non_young_time_ms = 0.0; | |
6100 | |
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6101 // Since the collection set is a superset of the the young list, |
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6102 // all we need to do to clear the young list is clear its |
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6103 // head and length, and unlink any young regions in the code below |
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6104 _young_list->clear(); |
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6105 |
342 | 6106 G1CollectorPolicy* policy = g1_policy(); |
6107 | |
6108 double start_sec = os::elapsedTime(); | |
6109 bool non_young = true; | |
6110 | |
6111 HeapRegion* cur = cs_head; | |
6112 int age_bound = -1; | |
6113 size_t rs_lengths = 0; | |
6114 | |
6115 while (cur != NULL) { | |
2361 | 6116 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 6117 if (non_young) { |
6118 if (cur->is_young()) { | |
6119 double end_sec = os::elapsedTime(); | |
6120 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
6121 non_young_time_ms += elapsed_ms; | |
6122 | |
6123 start_sec = os::elapsedTime(); | |
6124 non_young = false; | |
6125 } | |
6126 } else { | |
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6127 if (!cur->is_young()) { |
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6128 double end_sec = os::elapsedTime(); |
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6129 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
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6130 young_time_ms += elapsed_ms; |
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6131 |
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6132 start_sec = os::elapsedTime(); |
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6133 non_young = true; |
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6134 } |
342 | 6135 } |
6136 | |
6137 rs_lengths += cur->rem_set()->occupied(); | |
6138 | |
6139 HeapRegion* next = cur->next_in_collection_set(); | |
6140 assert(cur->in_collection_set(), "bad CS"); | |
6141 cur->set_next_in_collection_set(NULL); | |
6142 cur->set_in_collection_set(false); | |
6143 | |
6144 if (cur->is_young()) { | |
6145 int index = cur->young_index_in_cset(); | |
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6146 assert(index != -1, "invariant"); |
6010
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6147 assert((uint) index < policy->young_cset_region_length(), "invariant"); |
342 | 6148 size_t words_survived = _surviving_young_words[index]; |
6149 cur->record_surv_words_in_group(words_survived); | |
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6150 |
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6151 // At this point the we have 'popped' cur from the collection set |
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6152 // (linked via next_in_collection_set()) but it is still in the |
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6153 // young list (linked via next_young_region()). Clear the |
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6154 // _next_young_region field. |
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6155 cur->set_next_young_region(NULL); |
342 | 6156 } else { |
6157 int index = cur->young_index_in_cset(); | |
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6158 assert(index == -1, "invariant"); |
342 | 6159 } |
6160 | |
6161 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
6162 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
6163 "invariant" ); | |
6164 | |
6165 if (!cur->evacuation_failed()) { | |
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6166 MemRegion used_mr = cur->used_region(); |
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6167 |
342 | 6168 // And the region is empty. |
4097
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|
6169 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
2152 | 6170 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 6171 } else { |
6172 cur->uninstall_surv_rate_group(); | |
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|
6173 if (cur->is_young()) { |
342 | 6174 cur->set_young_index_in_cset(-1); |
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|
6175 } |
342 | 6176 cur->set_not_young(); |
6177 cur->set_evacuation_failed(false); | |
4072 | 6178 // The region is now considered to be old. |
6179 _old_set.add(cur); | |
10405 | 6180 evacuation_info.increment_collectionset_used_after(cur->used()); |
342 | 6181 } |
6182 cur = next; | |
6183 } | |
6184 | |
10405 | 6185 evacuation_info.set_regions_freed(local_free_list.length()); |
342 | 6186 policy->record_max_rs_lengths(rs_lengths); |
6187 policy->cset_regions_freed(); | |
6188 | |
6189 double end_sec = os::elapsedTime(); | |
6190 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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|
6191 |
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|
6192 if (non_young) { |
342 | 6193 non_young_time_ms += elapsed_ms; |
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6194 } else { |
342 | 6195 young_time_ms += elapsed_ms; |
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|
6196 } |
342 | 6197 |
2152 | 6198 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 6199 NULL /* old_proxy_set */, |
2152 | 6200 NULL /* humongous_proxy_set */, |
6201 false /* par */); | |
6219
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|
6202 policy->phase_times()->record_young_free_cset_time_ms(young_time_ms); |
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|
6203 policy->phase_times()->record_non_young_free_cset_time_ms(non_young_time_ms); |
342 | 6204 } |
6205 | |
1394
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6206 // This routine is similar to the above but does not record |
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|
6207 // any policy statistics or update free lists; we are abandoning |
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|
6208 // the current incremental collection set in preparation of a |
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|
6209 // full collection. After the full GC we will start to build up |
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|
6210 // the incremental collection set again. |
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|
6211 // This is only called when we're doing a full collection |
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|
6212 // and is immediately followed by the tearing down of the young list. |
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|
6213 |
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|
6214 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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6215 HeapRegion* cur = cs_head; |
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|
6216 |
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|
6217 while (cur != NULL) { |
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6218 HeapRegion* next = cur->next_in_collection_set(); |
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|
6219 assert(cur->in_collection_set(), "bad CS"); |
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|
6220 cur->set_next_in_collection_set(NULL); |
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6221 cur->set_in_collection_set(false); |
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|
6222 cur->set_young_index_in_cset(-1); |
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|
6223 cur = next; |
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|
6224 } |
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|
6225 } |
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|
6226 |
2152 | 6227 void G1CollectedHeap::set_free_regions_coming() { |
6228 if (G1ConcRegionFreeingVerbose) { | |
6229 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
6230 "setting free regions coming"); | |
6231 } | |
6232 | |
6233 assert(!free_regions_coming(), "pre-condition"); | |
6234 _free_regions_coming = true; | |
342 | 6235 } |
6236 | |
2152 | 6237 void G1CollectedHeap::reset_free_regions_coming() { |
4837
eff609af17d7
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6238 assert(free_regions_coming(), "pre-condition"); |
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6239 |
2152 | 6240 { |
6241 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6242 _free_regions_coming = false; | |
6243 SecondaryFreeList_lock->notify_all(); | |
6244 } | |
6245 | |
6246 if (G1ConcRegionFreeingVerbose) { | |
6247 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
6248 "reset free regions coming"); | |
342 | 6249 } |
6250 } | |
6251 | |
2152 | 6252 void G1CollectedHeap::wait_while_free_regions_coming() { |
6253 // Most of the time we won't have to wait, so let's do a quick test | |
6254 // first before we take the lock. | |
6255 if (!free_regions_coming()) { | |
6256 return; | |
6257 } | |
6258 | |
6259 if (G1ConcRegionFreeingVerbose) { | |
6260 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
6261 "waiting for free regions"); | |
342 | 6262 } |
6263 | |
6264 { | |
2152 | 6265 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
6266 while (free_regions_coming()) { | |
6267 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 6268 } |
2152 | 6269 } |
6270 | |
6271 if (G1ConcRegionFreeingVerbose) { | |
6272 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
6273 "done waiting for free regions"); | |
6274 } | |
342 | 6275 } |
6276 | |
6277 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
6278 assert(heap_lock_held_for_gc(), | |
6279 "the heap lock should already be held by or for this thread"); | |
6280 _young_list->push_region(hr); | |
6281 } | |
6282 | |
6283 class NoYoungRegionsClosure: public HeapRegionClosure { | |
6284 private: | |
6285 bool _success; | |
6286 public: | |
6287 NoYoungRegionsClosure() : _success(true) { } | |
6288 bool doHeapRegion(HeapRegion* r) { | |
6289 if (r->is_young()) { | |
6290 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
6291 r->bottom(), r->end()); | |
6292 _success = false; | |
6293 } | |
6294 return false; | |
6295 } | |
6296 bool success() { return _success; } | |
6297 }; | |
6298 | |
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6299 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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6300 bool ret = _young_list->check_list_empty(check_sample); |
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6301 |
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|
6302 if (check_heap) { |
342 | 6303 NoYoungRegionsClosure closure; |
6304 heap_region_iterate(&closure); | |
6305 ret = ret && closure.success(); | |
6306 } | |
6307 | |
6308 return ret; | |
6309 } | |
6310 | |
4072 | 6311 class TearDownRegionSetsClosure : public HeapRegionClosure { |
6312 private: | |
6313 OldRegionSet *_old_set; | |
2152 | 6314 |
342 | 6315 public: |
4072 | 6316 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 6317 |
342 | 6318 bool doHeapRegion(HeapRegion* r) { |
4072 | 6319 if (r->is_empty()) { |
6320 // We ignore empty regions, we'll empty the free list afterwards | |
6321 } else if (r->is_young()) { | |
6322 // We ignore young regions, we'll empty the young list afterwards | |
6323 } else if (r->isHumongous()) { | |
6324 // We ignore humongous regions, we're not tearing down the | |
6325 // humongous region set | |
342 | 6326 } else { |
4072 | 6327 // The rest should be old |
6328 _old_set->remove(r); | |
342 | 6329 } |
6330 return false; | |
6331 } | |
6332 | |
4072 | 6333 ~TearDownRegionSetsClosure() { |
6334 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 6335 } |
342 | 6336 }; |
6337 | |
4072 | 6338 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
6339 assert_at_safepoint(true /* should_be_vm_thread */); | |
6340 | |
6341 if (!free_list_only) { | |
6342 TearDownRegionSetsClosure cl(&_old_set); | |
6343 heap_region_iterate(&cl); | |
6344 | |
6345 // Need to do this after the heap iteration to be able to | |
6346 // recognize the young regions and ignore them during the iteration. | |
6347 _young_list->empty_list(); | |
6348 } | |
6349 _free_list.remove_all(); | |
6350 } | |
6351 | |
6352 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
6353 private: | |
6354 bool _free_list_only; | |
6355 OldRegionSet* _old_set; | |
6356 FreeRegionList* _free_list; | |
6357 size_t _total_used; | |
6358 | |
6359 public: | |
6360 RebuildRegionSetsClosure(bool free_list_only, | |
6361 OldRegionSet* old_set, FreeRegionList* free_list) : | |
6362 _free_list_only(free_list_only), | |
6363 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
6364 assert(_free_list->is_empty(), "pre-condition"); | |
6365 if (!free_list_only) { | |
6366 assert(_old_set->is_empty(), "pre-condition"); | |
6367 } | |
6368 } | |
6369 | |
6370 bool doHeapRegion(HeapRegion* r) { | |
6371 if (r->continuesHumongous()) { | |
6372 return false; | |
6373 } | |
6374 | |
6375 if (r->is_empty()) { | |
6376 // Add free regions to the free list | |
6377 _free_list->add_as_tail(r); | |
6378 } else if (!_free_list_only) { | |
6379 assert(!r->is_young(), "we should not come across young regions"); | |
6380 | |
6381 if (r->isHumongous()) { | |
6382 // We ignore humongous regions, we left the humongous set unchanged | |
6383 } else { | |
6384 // The rest should be old, add them to the old set | |
6385 _old_set->add(r); | |
6386 } | |
6387 _total_used += r->used(); | |
6388 } | |
6389 | |
6390 return false; | |
6391 } | |
6392 | |
6393 size_t total_used() { | |
6394 return _total_used; | |
6395 } | |
6396 }; | |
6397 | |
6398 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
6399 assert_at_safepoint(true /* should_be_vm_thread */); | |
6400 | |
6401 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
6402 heap_region_iterate(&cl); | |
6403 | |
6404 if (!free_list_only) { | |
6405 _summary_bytes_used = cl.total_used(); | |
6406 } | |
6407 assert(_summary_bytes_used == recalculate_used(), | |
6408 err_msg("inconsistent _summary_bytes_used, " | |
6409 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
6410 _summary_bytes_used, recalculate_used())); | |
342 | 6411 } |
6412 | |
6413 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
6414 _refine_cte_cl->set_concurrent(concurrent); | |
6415 } | |
6416 | |
6417 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
6418 HeapRegion* hr = heap_region_containing(p); | |
6419 if (hr == NULL) { | |
6725
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6964458: Reimplement class meta-data storage to use native memory
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6420 return false; |
342 | 6421 } else { |
6422 return hr->is_in(p); | |
6423 } | |
6424 } | |
2152 | 6425 |
3830
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|
6426 // Methods for the mutator alloc region |
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6427 |
2433
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|
6428 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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|
6429 bool force) { |
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|
6430 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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6431 assert(!force || g1_policy()->can_expand_young_list(), |
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|
6432 "if force is true we should be able to expand the young list"); |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
6433 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
6434 if (force || !young_list_full) { |
2433
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6435 HeapRegion* new_alloc_region = new_region(word_size, |
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|
6436 false /* do_expand */); |
abdfc822206f
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|
6437 if (new_alloc_region != NULL) { |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6438 set_region_short_lived_locked(new_alloc_region); |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
6439 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6440 return new_alloc_region; |
abdfc822206f
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|
6441 } |
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|
6442 } |
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|
6443 return NULL; |
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|
6444 } |
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|
6445 |
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|
6446 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
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|
6447 size_t allocated_bytes) { |
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|
6448 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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|
6449 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
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|
6450 |
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|
6451 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
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|
6452 _summary_bytes_used += allocated_bytes; |
3778
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diff
changeset
|
6453 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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3979
diff
changeset
|
6454 // We update the eden sizes here, when the region is retired, |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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diff
changeset
|
6455 // instead of when it's allocated, since this is the point that its |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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diff
changeset
|
6456 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
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diff
changeset
|
6457 g1mm()->update_eden_size(); |
2433
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diff
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|
6458 } |
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|
6459 |
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|
6460 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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|
6461 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
6462 return _g1h->new_mutator_alloc_region(word_size, force); |
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|
6463 } |
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|
6464 |
4095
bca17e38de00
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|
6465 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6466 // Don't change the number of workers. Use the value previously set |
bca17e38de00
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diff
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|
6467 // in the workgroup. |
4711 | 6468 assert(G1CollectedHeap::use_parallel_gc_threads(), "shouldn't be here otherwise"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
6469 uint n_workers = workers()->active_workers(); |
4711 | 6470 assert(UseDynamicNumberOfGCThreads || |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
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diff
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|
6471 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6472 "Otherwise should be using the total number of workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6473 if (n_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6474 assert(false, "Should have been set in prior evacuation pause."); |
bca17e38de00
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jmasa
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|
6475 n_workers = ParallelGCThreads; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6476 workers()->set_active_workers(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
6477 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6478 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6479 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
6480 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6481 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6482 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
6483 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6484 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6485 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6486 // Methods for the GC alloc regions |
f44782f04dd4
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|
6487 |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6488 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
changeset
|
6489 uint count, |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6490 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6491 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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|
6492 |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6493 if (count < g1_policy()->max_regions(ap)) { |
f44782f04dd4
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diff
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|
6494 HeapRegion* new_alloc_region = new_region(word_size, |
f44782f04dd4
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diff
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|
6495 true /* do_expand */); |
f44782f04dd4
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diff
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|
6496 if (new_alloc_region != NULL) { |
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diff
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|
6497 // We really only need to do this for old regions given that we |
f44782f04dd4
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diff
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|
6498 // should never scan survivors. But it doesn't hurt to do it |
f44782f04dd4
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diff
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|
6499 // for survivors too. |
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|
6500 new_alloc_region->set_saved_mark(); |
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|
6501 if (ap == GCAllocForSurvived) { |
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|
6502 new_alloc_region->set_survivor(); |
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|
6503 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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|
6504 } else { |
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|
6505 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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|
6506 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
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|
6507 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
6508 new_alloc_region->note_start_of_copying(during_im); |
3830
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|
6509 return new_alloc_region; |
f44782f04dd4
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diff
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|
6510 } else { |
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|
6511 g1_policy()->note_alloc_region_limit_reached(ap); |
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|
6512 } |
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|
6513 } |
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|
6514 return NULL; |
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|
6515 } |
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|
6516 |
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|
6517 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
f44782f04dd4
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|
6518 size_t allocated_bytes, |
f44782f04dd4
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|
6519 GCAllocPurpose ap) { |
4787
2ace1c4ee8da
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4785
diff
changeset
|
6520 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
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4785
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changeset
|
6521 alloc_region->note_end_of_copying(during_im); |
3830
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|
6522 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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|
6523 if (ap == GCAllocForSurvived) { |
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6524 young_list()->add_survivor_region(alloc_region); |
4072 | 6525 } else { |
6526 _old_set.add(alloc_region); | |
3830
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|
6527 } |
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|
6528 _hr_printer.retire(alloc_region); |
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|
6529 } |
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|
6530 |
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6531 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6532 bool force) { |
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|
6533 assert(!force, "not supported for GC alloc regions"); |
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6534 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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|
6535 } |
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6536 |
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6537 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6538 size_t allocated_bytes) { |
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6539 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6540 GCAllocForSurvived); |
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6541 } |
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6542 |
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6543 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6544 bool force) { |
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6545 assert(!force, "not supported for GC alloc regions"); |
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6546 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6547 } |
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6548 |
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6549 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6550 size_t allocated_bytes) { |
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6551 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6552 GCAllocForTenured); |
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6553 } |
2433
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6554 // Heap region set verification |
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6555 |
2152 | 6556 class VerifyRegionListsClosure : public HeapRegionClosure { |
6557 private: | |
4072 | 6558 FreeRegionList* _free_list; |
6559 OldRegionSet* _old_set; | |
2152 | 6560 HumongousRegionSet* _humongous_set; |
6010
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6561 uint _region_count; |
2152 | 6562 |
6563 public: | |
4072 | 6564 VerifyRegionListsClosure(OldRegionSet* old_set, |
6565 HumongousRegionSet* humongous_set, | |
2152 | 6566 FreeRegionList* free_list) : |
4072 | 6567 _old_set(old_set), _humongous_set(humongous_set), |
6568 _free_list(free_list), _region_count(0) { } | |
2152 | 6569 |
6010
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6570 uint region_count() { return _region_count; } |
2152 | 6571 |
6572 bool doHeapRegion(HeapRegion* hr) { | |
6573 _region_count += 1; | |
6574 | |
6575 if (hr->continuesHumongous()) { | |
6576 return false; | |
6577 } | |
6578 | |
6579 if (hr->is_young()) { | |
6580 // TODO | |
6581 } else if (hr->startsHumongous()) { | |
6582 _humongous_set->verify_next_region(hr); | |
6583 } else if (hr->is_empty()) { | |
6584 _free_list->verify_next_region(hr); | |
4072 | 6585 } else { |
6586 _old_set->verify_next_region(hr); | |
2152 | 6587 } |
6588 return false; | |
6589 } | |
6590 }; | |
6591 | |
6010
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6592 HeapRegion* G1CollectedHeap::new_heap_region(uint hrs_index, |
3766 | 6593 HeapWord* bottom) { |
6594 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6595 MemRegion mr(bottom, end); | |
6596 assert(_g1_reserved.contains(mr), "invariant"); | |
6597 // This might return NULL if the allocation fails | |
6754
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6598 return new HeapRegion(hrs_index, _bot_shared, mr); |
3766 | 6599 } |
6600 | |
2152 | 6601 void G1CollectedHeap::verify_region_sets() { |
6602 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6603 | |
6604 // First, check the explicit lists. | |
6605 _free_list.verify(); | |
6606 { | |
6607 // Given that a concurrent operation might be adding regions to | |
6608 // the secondary free list we have to take the lock before | |
6609 // verifying it. | |
6610 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6611 _secondary_free_list.verify(); | |
6612 } | |
4072 | 6613 _old_set.verify(); |
2152 | 6614 _humongous_set.verify(); |
6615 | |
6616 // If a concurrent region freeing operation is in progress it will | |
6617 // be difficult to correctly attributed any free regions we come | |
6618 // across to the correct free list given that they might belong to | |
6619 // one of several (free_list, secondary_free_list, any local lists, | |
6620 // etc.). So, if that's the case we will skip the rest of the | |
6621 // verification operation. Alternatively, waiting for the concurrent | |
6622 // operation to complete will have a non-trivial effect on the GC's | |
6623 // operation (no concurrent operation will last longer than the | |
6624 // interval between two calls to verification) and it might hide | |
6625 // any issues that we would like to catch during testing. | |
6626 if (free_regions_coming()) { | |
6627 return; | |
6628 } | |
6629 | |
2361 | 6630 // Make sure we append the secondary_free_list on the free_list so |
6631 // that all free regions we will come across can be safely | |
6632 // attributed to the free_list. | |
6633 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6634 |
6635 // Finally, make sure that the region accounting in the lists is | |
6636 // consistent with what we see in the heap. | |
4072 | 6637 _old_set.verify_start(); |
2152 | 6638 _humongous_set.verify_start(); |
6639 _free_list.verify_start(); | |
6640 | |
4072 | 6641 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6642 heap_region_iterate(&cl); |
6643 | |
4072 | 6644 _old_set.verify_end(); |
2152 | 6645 _humongous_set.verify_end(); |
6646 _free_list.verify_end(); | |
342 | 6647 } |
12080 | 6648 |
6649 // Optimized nmethod scanning | |
6650 | |
6651 class RegisterNMethodOopClosure: public OopClosure { | |
6652 G1CollectedHeap* _g1h; | |
6653 nmethod* _nm; | |
6654 | |
6655 template <class T> void do_oop_work(T* p) { | |
6656 T heap_oop = oopDesc::load_heap_oop(p); | |
6657 if (!oopDesc::is_null(heap_oop)) { | |
6658 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6659 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
13062
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6660 assert(!hr->continuesHumongous(), |
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6661 err_msg("trying to add code root "PTR_FORMAT" in continuation of humongous region "HR_FORMAT |
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6662 " starting at "HR_FORMAT, |
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6663 _nm, HR_FORMAT_PARAMS(hr), HR_FORMAT_PARAMS(hr->humongous_start_region()))); |
12080 | 6664 |
6665 // HeapRegion::add_strong_code_root() avoids adding duplicate | |
6666 // entries but having duplicates is OK since we "mark" nmethods | |
6667 // as visited when we scan the strong code root lists during the GC. | |
6668 hr->add_strong_code_root(_nm); | |
13062
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6669 assert(hr->rem_set()->strong_code_roots_list_contains(_nm), |
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6670 err_msg("failed to add code root "PTR_FORMAT" to remembered set of region "HR_FORMAT, |
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6671 _nm, HR_FORMAT_PARAMS(hr))); |
12080 | 6672 } |
6673 } | |
6674 | |
6675 public: | |
6676 RegisterNMethodOopClosure(G1CollectedHeap* g1h, nmethod* nm) : | |
6677 _g1h(g1h), _nm(nm) {} | |
6678 | |
6679 void do_oop(oop* p) { do_oop_work(p); } | |
6680 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6681 }; | |
6682 | |
6683 class UnregisterNMethodOopClosure: public OopClosure { | |
6684 G1CollectedHeap* _g1h; | |
6685 nmethod* _nm; | |
6686 | |
6687 template <class T> void do_oop_work(T* p) { | |
6688 T heap_oop = oopDesc::load_heap_oop(p); | |
6689 if (!oopDesc::is_null(heap_oop)) { | |
6690 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6691 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
13062
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6692 assert(!hr->continuesHumongous(), |
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6693 err_msg("trying to remove code root "PTR_FORMAT" in continuation of humongous region "HR_FORMAT |
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|
6694 " starting at "HR_FORMAT, |
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|
6695 _nm, HR_FORMAT_PARAMS(hr), HR_FORMAT_PARAMS(hr->humongous_start_region()))); |
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|
6696 |
12080 | 6697 hr->remove_strong_code_root(_nm); |
13062
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6698 assert(!hr->rem_set()->strong_code_roots_list_contains(_nm), |
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6699 err_msg("failed to remove code root "PTR_FORMAT" of region "HR_FORMAT, |
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6700 _nm, HR_FORMAT_PARAMS(hr))); |
12080 | 6701 } |
6702 } | |
6703 | |
6704 public: | |
6705 UnregisterNMethodOopClosure(G1CollectedHeap* g1h, nmethod* nm) : | |
6706 _g1h(g1h), _nm(nm) {} | |
6707 | |
6708 void do_oop(oop* p) { do_oop_work(p); } | |
6709 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6710 }; | |
6711 | |
6712 void G1CollectedHeap::register_nmethod(nmethod* nm) { | |
6713 CollectedHeap::register_nmethod(nm); | |
6714 | |
6715 guarantee(nm != NULL, "sanity"); | |
6716 RegisterNMethodOopClosure reg_cl(this, nm); | |
6717 nm->oops_do(®_cl); | |
6718 } | |
6719 | |
6720 void G1CollectedHeap::unregister_nmethod(nmethod* nm) { | |
6721 CollectedHeap::unregister_nmethod(nm); | |
6722 | |
6723 guarantee(nm != NULL, "sanity"); | |
6724 UnregisterNMethodOopClosure reg_cl(this, nm); | |
6725 nm->oops_do(®_cl, true); | |
6726 } | |
6727 | |
6728 class MigrateCodeRootsHeapRegionClosure: public HeapRegionClosure { | |
6729 public: | |
6730 bool doHeapRegion(HeapRegion *hr) { | |
13062
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6731 assert(!hr->isHumongous(), |
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|
6732 err_msg("humongous region "HR_FORMAT" should not have been added to collection set", |
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|
6733 HR_FORMAT_PARAMS(hr))); |
12080 | 6734 hr->migrate_strong_code_roots(); |
6735 return false; | |
6736 } | |
6737 }; | |
6738 | |
6739 void G1CollectedHeap::migrate_strong_code_roots() { | |
6740 MigrateCodeRootsHeapRegionClosure cl; | |
6741 double migrate_start = os::elapsedTime(); | |
6742 collection_set_iterate(&cl); | |
6743 double migration_time_ms = (os::elapsedTime() - migrate_start) * 1000.0; | |
6744 g1_policy()->phase_times()->record_strong_code_root_migration_time(migration_time_ms); | |
6745 } | |
6746 | |
6747 // Mark all the code roots that point into regions *not* in the | |
6748 // collection set. | |
6749 // | |
6750 // Note we do not want to use a "marking" CodeBlobToOopClosure while | |
6751 // walking the the code roots lists of regions not in the collection | |
6752 // set. Suppose we have an nmethod (M) that points to objects in two | |
6753 // separate regions - one in the collection set (R1) and one not (R2). | |
6754 // Using a "marking" CodeBlobToOopClosure here would result in "marking" | |
6755 // nmethod M when walking the code roots for R1. When we come to scan | |
6756 // the code roots for R2, we would see that M is already marked and it | |
6757 // would be skipped and the objects in R2 that are referenced from M | |
6758 // would not be evacuated. | |
6759 | |
6760 class MarkStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
6761 | |
6762 class MarkStrongCodeRootOopClosure: public OopClosure { | |
6763 ConcurrentMark* _cm; | |
6764 HeapRegion* _hr; | |
6765 uint _worker_id; | |
6766 | |
6767 template <class T> void do_oop_work(T* p) { | |
6768 T heap_oop = oopDesc::load_heap_oop(p); | |
6769 if (!oopDesc::is_null(heap_oop)) { | |
6770 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6771 // Only mark objects in the region (which is assumed | |
6772 // to be not in the collection set). | |
6773 if (_hr->is_in(obj)) { | |
6774 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); | |
6775 } | |
6776 } | |
6777 } | |
6778 | |
6779 public: | |
6780 MarkStrongCodeRootOopClosure(ConcurrentMark* cm, HeapRegion* hr, uint worker_id) : | |
6781 _cm(cm), _hr(hr), _worker_id(worker_id) { | |
6782 assert(!_hr->in_collection_set(), "sanity"); | |
6783 } | |
6784 | |
6785 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6786 void do_oop(oop* p) { do_oop_work(p); } | |
6787 }; | |
6788 | |
6789 MarkStrongCodeRootOopClosure _oop_cl; | |
6790 | |
6791 public: | |
6792 MarkStrongCodeRootCodeBlobClosure(ConcurrentMark* cm, HeapRegion* hr, uint worker_id): | |
6793 _oop_cl(cm, hr, worker_id) {} | |
6794 | |
6795 void do_code_blob(CodeBlob* cb) { | |
6796 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
6797 if (nm != NULL) { | |
6798 nm->oops_do(&_oop_cl); | |
6799 } | |
6800 } | |
6801 }; | |
6802 | |
6803 class MarkStrongCodeRootsHRClosure: public HeapRegionClosure { | |
6804 G1CollectedHeap* _g1h; | |
6805 uint _worker_id; | |
6806 | |
6807 public: | |
6808 MarkStrongCodeRootsHRClosure(G1CollectedHeap* g1h, uint worker_id) : | |
6809 _g1h(g1h), _worker_id(worker_id) {} | |
6810 | |
6811 bool doHeapRegion(HeapRegion *hr) { | |
6812 HeapRegionRemSet* hrrs = hr->rem_set(); | |
13062
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6813 if (hr->continuesHumongous()) { |
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6814 // Code roots should never be attached to a continuation of a humongous region |
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6815 assert(hrrs->strong_code_roots_list_length() == 0, |
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|
6816 err_msg("code roots should never be attached to continuations of humongous region "HR_FORMAT |
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6817 " starting at "HR_FORMAT", but has "INT32_FORMAT, |
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6818 HR_FORMAT_PARAMS(hr), HR_FORMAT_PARAMS(hr->humongous_start_region()), |
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|
6819 hrrs->strong_code_roots_list_length())); |
12080 | 6820 return false; |
6821 } | |
6822 | |
6823 if (hr->in_collection_set()) { | |
6824 // Don't mark code roots into regions in the collection set here. | |
6825 // They will be marked when we scan them. | |
6826 return false; | |
6827 } | |
6828 | |
6829 MarkStrongCodeRootCodeBlobClosure cb_cl(_g1h->concurrent_mark(), hr, _worker_id); | |
6830 hr->strong_code_roots_do(&cb_cl); | |
6831 return false; | |
6832 } | |
6833 }; | |
6834 | |
6835 void G1CollectedHeap::mark_strong_code_roots(uint worker_id) { | |
6836 MarkStrongCodeRootsHRClosure cl(this, worker_id); | |
12082
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6837 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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6838 heap_region_par_iterate_chunked(&cl, |
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6839 worker_id, |
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6840 workers()->active_workers(), |
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6841 HeapRegion::ParMarkRootClaimValue); |
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6842 } else { |
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6843 heap_region_iterate(&cl); |
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6844 } |
12080 | 6845 } |
6846 | |
6847 class RebuildStrongCodeRootClosure: public CodeBlobClosure { | |
6848 G1CollectedHeap* _g1h; | |
6849 | |
6850 public: | |
6851 RebuildStrongCodeRootClosure(G1CollectedHeap* g1h) : | |
6852 _g1h(g1h) {} | |
6853 | |
6854 void do_code_blob(CodeBlob* cb) { | |
6855 nmethod* nm = (cb != NULL) ? cb->as_nmethod_or_null() : NULL; | |
6856 if (nm == NULL) { | |
6857 return; | |
6858 } | |
6859 | |
6860 if (ScavengeRootsInCode && nm->detect_scavenge_root_oops()) { | |
6861 _g1h->register_nmethod(nm); | |
6862 } | |
6863 } | |
6864 }; | |
6865 | |
6866 void G1CollectedHeap::rebuild_strong_code_roots() { | |
6867 RebuildStrongCodeRootClosure blob_cl(this); | |
6868 CodeCache::blobs_do(&blob_cl); | |
6869 } |