Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 6030:48fac5d60c3c
7163848: G1: Log GC Cause for a GC
Reviewed-by: johnc, jwilhelm, jmasa
author | brutisso |
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date | Wed, 25 Apr 2012 12:36:37 +0200 |
parents | 8a2e5a6a19a4 |
children | 3a22b77e755a |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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35 #include "gc_implementation/g1/g1EvacFailure.hpp" |
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36 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 37 #include "gc_implementation/g1/g1MarkSweep.hpp" |
38 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
39 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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40 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 41 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
42 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
43 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
44 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
45 #include "memory/gcLocker.inline.hpp" | |
46 #include "memory/genOopClosures.inline.hpp" | |
47 #include "memory/generationSpec.hpp" | |
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48 #include "memory/referenceProcessor.hpp" |
1972 | 49 #include "oops/oop.inline.hpp" |
50 #include "oops/oop.pcgc.inline.hpp" | |
51 #include "runtime/aprofiler.hpp" | |
52 #include "runtime/vmThread.hpp" | |
342 | 53 |
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54 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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55 |
342 | 56 // turn it on so that the contents of the young list (scan-only / |
57 // to-be-collected) are printed at "strategic" points before / during | |
58 // / after the collection --- this is useful for debugging | |
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59 #define YOUNG_LIST_VERBOSE 0 |
342 | 60 // CURRENT STATUS |
61 // This file is under construction. Search for "FIXME". | |
62 | |
63 // INVARIANTS/NOTES | |
64 // | |
65 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 66 // serialized by acquiring the HeapLock. This happens in mem_allocate |
67 // and allocate_new_tlab, which are the "entry" points to the | |
68 // allocation code from the rest of the JVM. (Note that this does not | |
69 // apply to TLAB allocation, which is not part of this interface: it | |
70 // is done by clients of this interface.) | |
342 | 71 |
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72 // Notes on implementation of parallelism in different tasks. |
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73 // |
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74 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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75 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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76 // It does use run_task() which sets _n_workers in the task. |
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77 // G1ParTask executes g1_process_strong_roots() -> |
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78 // SharedHeap::process_strong_roots() which calls eventuall to |
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79 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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80 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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81 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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82 // |
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83 |
342 | 84 // Local to this file. |
85 | |
86 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
87 SuspendibleThreadSet* _sts; | |
88 G1RemSet* _g1rs; | |
89 ConcurrentG1Refine* _cg1r; | |
90 bool _concurrent; | |
91 public: | |
92 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
93 G1RemSet* g1rs, | |
94 ConcurrentG1Refine* cg1r) : | |
95 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
96 {} | |
97 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 98 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
99 // This path is executed by the concurrent refine or mutator threads, | |
100 // concurrently, and so we do not care if card_ptr contains references | |
101 // that point into the collection set. | |
102 assert(!oops_into_cset, "should be"); | |
103 | |
342 | 104 if (_concurrent && _sts->should_yield()) { |
105 // Caller will actually yield. | |
106 return false; | |
107 } | |
108 // Otherwise, we finished successfully; return true. | |
109 return true; | |
110 } | |
111 void set_concurrent(bool b) { _concurrent = b; } | |
112 }; | |
113 | |
114 | |
115 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
116 int _calls; | |
117 G1CollectedHeap* _g1h; | |
118 CardTableModRefBS* _ctbs; | |
119 int _histo[256]; | |
120 public: | |
121 ClearLoggedCardTableEntryClosure() : | |
122 _calls(0) | |
123 { | |
124 _g1h = G1CollectedHeap::heap(); | |
125 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
126 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
127 } | |
128 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
129 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
130 _calls++; | |
131 unsigned char* ujb = (unsigned char*)card_ptr; | |
132 int ind = (int)(*ujb); | |
133 _histo[ind]++; | |
134 *card_ptr = -1; | |
135 } | |
136 return true; | |
137 } | |
138 int calls() { return _calls; } | |
139 void print_histo() { | |
140 gclog_or_tty->print_cr("Card table value histogram:"); | |
141 for (int i = 0; i < 256; i++) { | |
142 if (_histo[i] != 0) { | |
143 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
144 } | |
145 } | |
146 } | |
147 }; | |
148 | |
149 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
150 int _calls; | |
151 G1CollectedHeap* _g1h; | |
152 CardTableModRefBS* _ctbs; | |
153 public: | |
154 RedirtyLoggedCardTableEntryClosure() : | |
155 _calls(0) | |
156 { | |
157 _g1h = G1CollectedHeap::heap(); | |
158 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
159 } | |
160 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
161 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
162 _calls++; | |
163 *card_ptr = 0; | |
164 } | |
165 return true; | |
166 } | |
167 int calls() { return _calls; } | |
168 }; | |
169 | |
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170 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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171 public: |
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172 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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173 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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174 return true; |
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175 } |
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176 }; |
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177 |
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178 YoungList::YoungList(G1CollectedHeap* g1h) : |
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179 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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180 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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181 guarantee(check_list_empty(false), "just making sure..."); |
342 | 182 } |
183 | |
184 void YoungList::push_region(HeapRegion *hr) { | |
185 assert(!hr->is_young(), "should not already be young"); | |
186 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
187 | |
188 hr->set_next_young_region(_head); | |
189 _head = hr; | |
190 | |
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191 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 192 ++_length; |
193 } | |
194 | |
195 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 196 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 197 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
198 | |
199 hr->set_next_young_region(_survivor_head); | |
200 if (_survivor_head == NULL) { | |
545 | 201 _survivor_tail = hr; |
342 | 202 } |
203 _survivor_head = hr; | |
204 ++_survivor_length; | |
205 } | |
206 | |
207 void YoungList::empty_list(HeapRegion* list) { | |
208 while (list != NULL) { | |
209 HeapRegion* next = list->get_next_young_region(); | |
210 list->set_next_young_region(NULL); | |
211 list->uninstall_surv_rate_group(); | |
212 list->set_not_young(); | |
213 list = next; | |
214 } | |
215 } | |
216 | |
217 void YoungList::empty_list() { | |
218 assert(check_list_well_formed(), "young list should be well formed"); | |
219 | |
220 empty_list(_head); | |
221 _head = NULL; | |
222 _length = 0; | |
223 | |
224 empty_list(_survivor_head); | |
225 _survivor_head = NULL; | |
545 | 226 _survivor_tail = NULL; |
342 | 227 _survivor_length = 0; |
228 | |
229 _last_sampled_rs_lengths = 0; | |
230 | |
231 assert(check_list_empty(false), "just making sure..."); | |
232 } | |
233 | |
234 bool YoungList::check_list_well_formed() { | |
235 bool ret = true; | |
236 | |
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237 uint length = 0; |
342 | 238 HeapRegion* curr = _head; |
239 HeapRegion* last = NULL; | |
240 while (curr != NULL) { | |
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241 if (!curr->is_young()) { |
342 | 242 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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243 "incorrectly tagged (y: %d, surv: %d)", |
342 | 244 curr->bottom(), curr->end(), |
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245 curr->is_young(), curr->is_survivor()); |
342 | 246 ret = false; |
247 } | |
248 ++length; | |
249 last = curr; | |
250 curr = curr->get_next_young_region(); | |
251 } | |
252 ret = ret && (length == _length); | |
253 | |
254 if (!ret) { | |
255 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
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256 gclog_or_tty->print_cr("### list has %u entries, _length is %u", |
342 | 257 length, _length); |
258 } | |
259 | |
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260 return ret; |
342 | 261 } |
262 | |
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263 bool YoungList::check_list_empty(bool check_sample) { |
342 | 264 bool ret = true; |
265 | |
266 if (_length != 0) { | |
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267 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %u", |
342 | 268 _length); |
269 ret = false; | |
270 } | |
271 if (check_sample && _last_sampled_rs_lengths != 0) { | |
272 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
273 ret = false; | |
274 } | |
275 if (_head != NULL) { | |
276 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
277 ret = false; | |
278 } | |
279 if (!ret) { | |
280 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
281 } | |
282 | |
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283 return ret; |
342 | 284 } |
285 | |
286 void | |
287 YoungList::rs_length_sampling_init() { | |
288 _sampled_rs_lengths = 0; | |
289 _curr = _head; | |
290 } | |
291 | |
292 bool | |
293 YoungList::rs_length_sampling_more() { | |
294 return _curr != NULL; | |
295 } | |
296 | |
297 void | |
298 YoungList::rs_length_sampling_next() { | |
299 assert( _curr != NULL, "invariant" ); | |
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300 size_t rs_length = _curr->rem_set()->occupied(); |
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301 |
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302 _sampled_rs_lengths += rs_length; |
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303 |
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304 // The current region may not yet have been added to the |
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305 // incremental collection set (it gets added when it is |
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306 // retired as the current allocation region). |
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307 if (_curr->in_collection_set()) { |
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308 // Update the collection set policy information for this region |
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309 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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310 } |
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311 |
342 | 312 _curr = _curr->get_next_young_region(); |
313 if (_curr == NULL) { | |
314 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
315 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
316 } | |
317 } | |
318 | |
319 void | |
320 YoungList::reset_auxilary_lists() { | |
321 guarantee( is_empty(), "young list should be empty" ); | |
322 assert(check_list_well_formed(), "young list should be well formed"); | |
323 | |
324 // Add survivor regions to SurvRateGroup. | |
325 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 326 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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327 |
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328 int young_index_in_cset = 0; |
342 | 329 for (HeapRegion* curr = _survivor_head; |
330 curr != NULL; | |
331 curr = curr->get_next_young_region()) { | |
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332 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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333 |
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334 // The region is a non-empty survivor so let's add it to |
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335 // the incremental collection set for the next evacuation |
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336 // pause. |
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337 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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338 young_index_in_cset += 1; |
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339 } |
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340 assert((uint) young_index_in_cset == _survivor_length, "post-condition"); |
342 | 341 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
342 | |
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343 _head = _survivor_head; |
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344 _length = _survivor_length; |
342 | 345 if (_survivor_head != NULL) { |
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346 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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347 assert(_survivor_length > 0, "invariant"); |
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348 _survivor_tail->set_next_young_region(NULL); |
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349 } |
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350 |
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351 // Don't clear the survivor list handles until the start of |
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352 // the next evacuation pause - we need it in order to re-tag |
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353 // the survivor regions from this evacuation pause as 'young' |
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354 // at the start of the next. |
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355 |
545 | 356 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 357 |
358 assert(check_list_well_formed(), "young list should be well formed"); | |
359 } | |
360 | |
361 void YoungList::print() { | |
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362 HeapRegion* lists[] = {_head, _survivor_head}; |
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363 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 364 |
365 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
366 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
367 HeapRegion *curr = lists[list]; | |
368 if (curr == NULL) | |
369 gclog_or_tty->print_cr(" empty"); | |
370 while (curr != NULL) { | |
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371 gclog_or_tty->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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372 HR_FORMAT_PARAMS(curr), |
342 | 373 curr->prev_top_at_mark_start(), |
374 curr->next_top_at_mark_start(), | |
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375 curr->age_in_surv_rate_group_cond()); |
342 | 376 curr = curr->get_next_young_region(); |
377 } | |
378 } | |
379 | |
380 gclog_or_tty->print_cr(""); | |
381 } | |
382 | |
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383 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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384 { |
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385 // Claim the right to put the region on the dirty cards region list |
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386 // by installing a self pointer. |
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387 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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388 if (next == NULL) { |
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389 HeapRegion* res = (HeapRegion*) |
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390 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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391 NULL); |
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392 if (res == NULL) { |
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393 HeapRegion* head; |
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394 do { |
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395 // Put the region to the dirty cards region list. |
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396 head = _dirty_cards_region_list; |
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397 next = (HeapRegion*) |
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398 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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399 if (next == head) { |
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400 assert(hr->get_next_dirty_cards_region() == hr, |
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401 "hr->get_next_dirty_cards_region() != hr"); |
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402 if (next == NULL) { |
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403 // The last region in the list points to itself. |
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404 hr->set_next_dirty_cards_region(hr); |
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405 } else { |
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406 hr->set_next_dirty_cards_region(next); |
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407 } |
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408 } |
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409 } while (next != head); |
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410 } |
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411 } |
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412 } |
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413 |
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414 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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415 { |
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416 HeapRegion* head; |
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417 HeapRegion* hr; |
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418 do { |
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419 head = _dirty_cards_region_list; |
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420 if (head == NULL) { |
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421 return NULL; |
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422 } |
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423 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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424 if (head == new_head) { |
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425 // The last region. |
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426 new_head = NULL; |
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427 } |
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428 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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429 head); |
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430 } while (hr != head); |
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431 assert(hr != NULL, "invariant"); |
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432 hr->set_next_dirty_cards_region(NULL); |
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433 return hr; |
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434 } |
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435 |
342 | 436 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 437 _cg1r->stop(); |
342 | 438 _cmThread->stop(); |
439 } | |
440 | |
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441 #ifdef ASSERT |
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442 // A region is added to the collection set as it is retired |
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443 // so an address p can point to a region which will be in the |
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444 // collection set but has not yet been retired. This method |
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445 // therefore is only accurate during a GC pause after all |
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446 // regions have been retired. It is used for debugging |
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447 // to check if an nmethod has references to objects that can |
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448 // be move during a partial collection. Though it can be |
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449 // inaccurate, it is sufficient for G1 because the conservative |
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450 // implementation of is_scavengable() for G1 will indicate that |
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451 // all nmethods must be scanned during a partial collection. |
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452 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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453 HeapRegion* hr = heap_region_containing(p); |
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454 return hr != NULL && hr->in_collection_set(); |
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455 } |
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456 #endif |
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457 |
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458 // Returns true if the reference points to an object that |
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459 // can move in an incremental collecction. |
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460 bool G1CollectedHeap::is_scavengable(const void* p) { |
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461 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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462 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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463 HeapRegion* hr = heap_region_containing(p); |
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464 if (hr == NULL) { |
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465 // perm gen (or null) |
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466 return false; |
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467 } else { |
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468 return !hr->isHumongous(); |
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469 } |
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470 } |
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471 |
342 | 472 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
473 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
474 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
475 | |
476 // Count the dirty cards at the start. | |
477 CountNonCleanMemRegionClosure count1(this); | |
478 ct_bs->mod_card_iterate(&count1); | |
479 int orig_count = count1.n(); | |
480 | |
481 // First clear the logged cards. | |
482 ClearLoggedCardTableEntryClosure clear; | |
483 dcqs.set_closure(&clear); | |
484 dcqs.apply_closure_to_all_completed_buffers(); | |
485 dcqs.iterate_closure_all_threads(false); | |
486 clear.print_histo(); | |
487 | |
488 // Now ensure that there's no dirty cards. | |
489 CountNonCleanMemRegionClosure count2(this); | |
490 ct_bs->mod_card_iterate(&count2); | |
491 if (count2.n() != 0) { | |
492 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
493 count2.n(), orig_count); | |
494 } | |
495 guarantee(count2.n() == 0, "Card table should be clean."); | |
496 | |
497 RedirtyLoggedCardTableEntryClosure redirty; | |
498 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
499 dcqs.apply_closure_to_all_completed_buffers(); | |
500 dcqs.iterate_closure_all_threads(false); | |
501 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
502 clear.calls(), orig_count); | |
503 guarantee(redirty.calls() == clear.calls(), | |
504 "Or else mechanism is broken."); | |
505 | |
506 CountNonCleanMemRegionClosure count3(this); | |
507 ct_bs->mod_card_iterate(&count3); | |
508 if (count3.n() != orig_count) { | |
509 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
510 orig_count, count3.n()); | |
511 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
512 } | |
513 | |
514 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
515 } | |
516 | |
517 // Private class members. | |
518 | |
519 G1CollectedHeap* G1CollectedHeap::_g1h; | |
520 | |
521 // Private methods. | |
522 | |
2152 | 523 HeapRegion* |
2361 | 524 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 525 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
526 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
527 if (!_secondary_free_list.is_empty()) { | |
528 if (G1ConcRegionFreeingVerbose) { | |
529 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
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530 "secondary_free_list has %u entries", |
2152 | 531 _secondary_free_list.length()); |
532 } | |
533 // It looks as if there are free regions available on the | |
534 // secondary_free_list. Let's move them to the free_list and try | |
535 // again to allocate from it. | |
536 append_secondary_free_list(); | |
537 | |
538 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
539 "empty we should have moved at least one entry to the free_list"); | |
540 HeapRegion* res = _free_list.remove_head(); | |
541 if (G1ConcRegionFreeingVerbose) { | |
542 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
543 "allocated "HR_FORMAT" from secondary_free_list", | |
544 HR_FORMAT_PARAMS(res)); | |
545 } | |
546 return res; | |
547 } | |
548 | |
549 // Wait here until we get notifed either when (a) there are no | |
550 // more free regions coming or (b) some regions have been moved on | |
551 // the secondary_free_list. | |
552 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
553 } | |
554 | |
555 if (G1ConcRegionFreeingVerbose) { | |
556 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
557 "could not allocate from secondary_free_list"); | |
558 } | |
559 return NULL; | |
560 } | |
561 | |
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562 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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563 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 564 "the only time we use this to allocate a humongous region is " |
565 "when we are allocating a single humongous region"); | |
566 | |
567 HeapRegion* res; | |
568 if (G1StressConcRegionFreeing) { | |
569 if (!_secondary_free_list.is_empty()) { | |
570 if (G1ConcRegionFreeingVerbose) { | |
571 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
572 "forced to look at the secondary_free_list"); | |
573 } | |
2361 | 574 res = new_region_try_secondary_free_list(); |
2152 | 575 if (res != NULL) { |
576 return res; | |
577 } | |
578 } | |
579 } | |
580 res = _free_list.remove_head_or_null(); | |
581 if (res == NULL) { | |
582 if (G1ConcRegionFreeingVerbose) { | |
583 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
584 "res == NULL, trying the secondary_free_list"); | |
585 } | |
2361 | 586 res = new_region_try_secondary_free_list(); |
2152 | 587 } |
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588 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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589 // Currently, only attempts to allocate GC alloc regions set |
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590 // do_expand to true. So, we should only reach here during a |
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591 // safepoint. If this assumption changes we might have to |
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592 // reconsider the use of _expand_heap_after_alloc_failure. |
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593 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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594 |
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595 ergo_verbose1(ErgoHeapSizing, |
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596 "attempt heap expansion", |
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597 ergo_format_reason("region allocation request failed") |
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598 ergo_format_byte("allocation request"), |
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599 word_size * HeapWordSize); |
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600 if (expand(word_size * HeapWordSize)) { |
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601 // Given that expand() succeeded in expanding the heap, and we |
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602 // always expand the heap by an amount aligned to the heap |
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603 // region size, the free list should in theory not be empty. So |
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604 // it would probably be OK to use remove_head(). But the extra |
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605 // check for NULL is unlikely to be a performance issue here (we |
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606 // just expanded the heap!) so let's just be conservative and |
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607 // use remove_head_or_null(). |
3766 | 608 res = _free_list.remove_head_or_null(); |
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609 } else { |
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610 _expand_heap_after_alloc_failure = false; |
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611 } |
342 | 612 } |
613 return res; | |
614 } | |
615 | |
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616 uint G1CollectedHeap::humongous_obj_allocate_find_first(uint num_regions, |
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617 size_t word_size) { |
2361 | 618 assert(isHumongous(word_size), "word_size should be humongous"); |
619 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
620 | |
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621 uint first = G1_NULL_HRS_INDEX; |
2152 | 622 if (num_regions == 1) { |
623 // Only one region to allocate, no need to go through the slower | |
624 // path. The caller will attempt the expasion if this fails, so | |
625 // let's not try to expand here too. | |
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626 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 627 if (hr != NULL) { |
628 first = hr->hrs_index(); | |
629 } else { | |
3766 | 630 first = G1_NULL_HRS_INDEX; |
2152 | 631 } |
632 } else { | |
633 // We can't allocate humongous regions while cleanupComplete() is | |
634 // running, since some of the regions we find to be empty might not | |
635 // yet be added to the free list and it is not straightforward to | |
636 // know which list they are on so that we can remove them. Note | |
637 // that we only need to do this if we need to allocate more than | |
638 // one region to satisfy the current humongous allocation | |
639 // request. If we are only allocating one region we use the common | |
640 // region allocation code (see above). | |
641 wait_while_free_regions_coming(); | |
2361 | 642 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 643 |
644 if (free_regions() >= num_regions) { | |
3766 | 645 first = _hrs.find_contiguous(num_regions); |
646 if (first != G1_NULL_HRS_INDEX) { | |
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647 for (uint i = first; i < first + num_regions; ++i) { |
3766 | 648 HeapRegion* hr = region_at(i); |
2152 | 649 assert(hr->is_empty(), "sanity"); |
2361 | 650 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 651 hr->set_pending_removal(true); |
652 } | |
653 _free_list.remove_all_pending(num_regions); | |
654 } | |
655 } | |
656 } | |
657 return first; | |
658 } | |
659 | |
2361 | 660 HeapWord* |
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661 G1CollectedHeap::humongous_obj_allocate_initialize_regions(uint first, |
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662 uint num_regions, |
2361 | 663 size_t word_size) { |
3766 | 664 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 665 assert(isHumongous(word_size), "word_size should be humongous"); |
666 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
667 | |
668 // Index of last region in the series + 1. | |
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669 uint last = first + num_regions; |
2361 | 670 |
671 // We need to initialize the region(s) we just discovered. This is | |
672 // a bit tricky given that it can happen concurrently with | |
673 // refinement threads refining cards on these regions and | |
674 // potentially wanting to refine the BOT as they are scanning | |
675 // those cards (this can happen shortly after a cleanup; see CR | |
676 // 6991377). So we have to set up the region(s) carefully and in | |
677 // a specific order. | |
678 | |
679 // The word size sum of all the regions we will allocate. | |
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680 size_t word_size_sum = (size_t) num_regions * HeapRegion::GrainWords; |
2361 | 681 assert(word_size <= word_size_sum, "sanity"); |
682 | |
683 // This will be the "starts humongous" region. | |
3766 | 684 HeapRegion* first_hr = region_at(first); |
2361 | 685 // The header of the new object will be placed at the bottom of |
686 // the first region. | |
687 HeapWord* new_obj = first_hr->bottom(); | |
688 // This will be the new end of the first region in the series that | |
689 // should also match the end of the last region in the seriers. | |
690 HeapWord* new_end = new_obj + word_size_sum; | |
691 // This will be the new top of the first region that will reflect | |
692 // this allocation. | |
693 HeapWord* new_top = new_obj + word_size; | |
694 | |
695 // First, we need to zero the header of the space that we will be | |
696 // allocating. When we update top further down, some refinement | |
697 // threads might try to scan the region. By zeroing the header we | |
698 // ensure that any thread that will try to scan the region will | |
699 // come across the zero klass word and bail out. | |
700 // | |
701 // NOTE: It would not have been correct to have used | |
702 // CollectedHeap::fill_with_object() and make the space look like | |
703 // an int array. The thread that is doing the allocation will | |
704 // later update the object header to a potentially different array | |
705 // type and, for a very short period of time, the klass and length | |
706 // fields will be inconsistent. This could cause a refinement | |
707 // thread to calculate the object size incorrectly. | |
708 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
709 | |
710 // We will set up the first region as "starts humongous". This | |
711 // will also update the BOT covering all the regions to reflect | |
712 // that there is a single object that starts at the bottom of the | |
713 // first region. | |
714 first_hr->set_startsHumongous(new_top, new_end); | |
715 | |
716 // Then, if there are any, we will set up the "continues | |
717 // humongous" regions. | |
718 HeapRegion* hr = NULL; | |
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719 for (uint i = first + 1; i < last; ++i) { |
3766 | 720 hr = region_at(i); |
2361 | 721 hr->set_continuesHumongous(first_hr); |
722 } | |
723 // If we have "continues humongous" regions (hr != NULL), then the | |
724 // end of the last one should match new_end. | |
725 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
726 | |
727 // Up to this point no concurrent thread would have been able to | |
728 // do any scanning on any region in this series. All the top | |
729 // fields still point to bottom, so the intersection between | |
730 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
731 // update the top fields, we'll do a storestore to make sure that | |
732 // no thread sees the update to top before the zeroing of the | |
733 // object header and the BOT initialization. | |
734 OrderAccess::storestore(); | |
735 | |
736 // Now that the BOT and the object header have been initialized, | |
737 // we can update top of the "starts humongous" region. | |
738 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
739 "new_top should be in this region"); | |
740 first_hr->set_top(new_top); | |
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741 if (_hr_printer.is_active()) { |
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742 HeapWord* bottom = first_hr->bottom(); |
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743 HeapWord* end = first_hr->orig_end(); |
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744 if ((first + 1) == last) { |
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745 // the series has a single humongous region |
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746 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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747 } else { |
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748 // the series has more than one humongous regions |
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749 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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750 } |
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751 } |
2361 | 752 |
753 // Now, we will update the top fields of the "continues humongous" | |
754 // regions. The reason we need to do this is that, otherwise, | |
755 // these regions would look empty and this will confuse parts of | |
756 // G1. For example, the code that looks for a consecutive number | |
757 // of empty regions will consider them empty and try to | |
758 // re-allocate them. We can extend is_empty() to also include | |
759 // !continuesHumongous(), but it is easier to just update the top | |
760 // fields here. The way we set top for all regions (i.e., top == | |
761 // end for all regions but the last one, top == new_top for the | |
762 // last one) is actually used when we will free up the humongous | |
763 // region in free_humongous_region(). | |
764 hr = NULL; | |
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765 for (uint i = first + 1; i < last; ++i) { |
3766 | 766 hr = region_at(i); |
2361 | 767 if ((i + 1) == last) { |
768 // last continues humongous region | |
769 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
770 "new_top should fall on this region"); | |
771 hr->set_top(new_top); | |
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772 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 773 } else { |
774 // not last one | |
775 assert(new_top > hr->end(), "new_top should be above this region"); | |
776 hr->set_top(hr->end()); | |
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777 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 778 } |
779 } | |
780 // If we have continues humongous regions (hr != NULL), then the | |
781 // end of the last one should match new_end and its top should | |
782 // match new_top. | |
783 assert(hr == NULL || | |
784 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
785 | |
786 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
787 _summary_bytes_used += first_hr->used(); | |
788 _humongous_set.add(first_hr); | |
789 | |
790 return new_obj; | |
791 } | |
792 | |
342 | 793 // If could fit into free regions w/o expansion, try. |
794 // Otherwise, if can expand, do so. | |
795 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 796 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 797 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
798 | |
799 verify_region_sets_optional(); | |
342 | 800 |
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801 size_t word_size_rounded = round_to(word_size, HeapRegion::GrainWords); |
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802 uint num_regions = (uint) (word_size_rounded / HeapRegion::GrainWords); |
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803 uint x_num = expansion_regions(); |
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804 uint fs = _hrs.free_suffix(); |
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805 uint first = humongous_obj_allocate_find_first(num_regions, word_size); |
3766 | 806 if (first == G1_NULL_HRS_INDEX) { |
2152 | 807 // The only thing we can do now is attempt expansion. |
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808 if (fs + x_num >= num_regions) { |
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809 // If the number of regions we're trying to allocate for this |
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810 // object is at most the number of regions in the free suffix, |
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811 // then the call to humongous_obj_allocate_find_first() above |
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812 // should have succeeded and we wouldn't be here. |
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813 // |
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814 // We should only be trying to expand when the free suffix is |
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815 // not sufficient for the object _and_ we have some expansion |
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816 // room available. |
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817 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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818 |
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819 ergo_verbose1(ErgoHeapSizing, |
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820 "attempt heap expansion", |
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821 ergo_format_reason("humongous allocation request failed") |
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822 ergo_format_byte("allocation request"), |
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823 word_size * HeapWordSize); |
2188
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824 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 825 // Even though the heap was expanded, it might not have |
826 // reached the desired size. So, we cannot assume that the | |
827 // allocation will succeed. | |
2188
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828 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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829 } |
2152 | 830 } |
831 } | |
832 | |
2361 | 833 HeapWord* result = NULL; |
3766 | 834 if (first != G1_NULL_HRS_INDEX) { |
2361 | 835 result = |
836 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
837 assert(result != NULL, "it should always return a valid result"); | |
3980
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838 |
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|
839 // A successful humongous object allocation changes the used space |
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|
840 // information of the old generation so we need to recalculate the |
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|
841 // sizes and update the jstat counters here. |
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|
842 g1mm()->update_sizes(); |
2152 | 843 } |
844 | |
845 verify_region_sets_optional(); | |
2361 | 846 |
847 return result; | |
342 | 848 } |
849 | |
1973 | 850 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
851 assert_heap_not_locked_and_not_at_safepoint(); | |
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852 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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|
853 |
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854 unsigned int dummy_gc_count_before; |
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855 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 856 } |
857 | |
858 HeapWord* | |
859 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 860 bool* gc_overhead_limit_was_exceeded) { |
861 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 862 |
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863 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 864 for (int try_count = 1; /* we'll return */; try_count += 1) { |
865 unsigned int gc_count_before; | |
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|
866 |
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|
867 HeapWord* result = NULL; |
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868 if (!isHumongous(word_size)) { |
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869 result = attempt_allocation(word_size, &gc_count_before); |
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|
870 } else { |
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|
871 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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|
872 } |
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|
873 if (result != NULL) { |
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|
874 return result; |
342 | 875 } |
876 | |
877 // Create the garbage collection operation... | |
1973 | 878 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 879 // ...and get the VM thread to execute it. |
880 VMThread::execute(&op); | |
1973 | 881 |
882 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
883 // If the operation was successful we'll return the result even | |
884 // if it is NULL. If the allocation attempt failed immediately | |
885 // after a Full GC, it's unlikely we'll be able to allocate now. | |
886 HeapWord* result = op.result(); | |
887 if (result != NULL && !isHumongous(word_size)) { | |
888 // Allocations that take place on VM operations do not do any | |
889 // card dirtying and we have to do it here. We only have to do | |
890 // this for non-humongous allocations, though. | |
891 dirty_young_block(result, word_size); | |
892 } | |
342 | 893 return result; |
1973 | 894 } else { |
895 assert(op.result() == NULL, | |
896 "the result should be NULL if the VM op did not succeed"); | |
342 | 897 } |
898 | |
899 // Give a warning if we seem to be looping forever. | |
900 if ((QueuedAllocationWarningCount > 0) && | |
901 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 902 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 903 } |
904 } | |
1973 | 905 |
906 ShouldNotReachHere(); | |
2433
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|
907 return NULL; |
342 | 908 } |
909 | |
2433
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|
910 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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|
911 unsigned int *gc_count_before_ret) { |
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|
912 // Make sure you read the note in attempt_allocation_humongous(). |
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|
913 |
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|
914 assert_heap_not_locked_and_not_at_safepoint(); |
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915 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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|
916 "be called for humongous allocation requests"); |
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|
917 |
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|
918 // We should only get here after the first-level allocation attempt |
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|
919 // (attempt_allocation()) failed to allocate. |
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|
920 |
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|
921 // We will loop until a) we manage to successfully perform the |
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|
922 // allocation or b) we successfully schedule a collection which |
abdfc822206f
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|
923 // fails to perform the allocation. b) is the only case when we'll |
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|
924 // return NULL. |
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|
925 HeapWord* result = NULL; |
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|
926 for (int try_count = 1; /* we'll return */; try_count += 1) { |
abdfc822206f
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|
927 bool should_try_gc; |
abdfc822206f
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|
928 unsigned int gc_count_before; |
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|
929 |
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|
930 { |
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|
931 MutexLockerEx x(Heap_lock); |
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|
932 |
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|
933 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
abdfc822206f
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|
934 false /* bot_updates */); |
abdfc822206f
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|
935 if (result != NULL) { |
abdfc822206f
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|
936 return result; |
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|
937 } |
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|
938 |
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|
939 // If we reach here, attempt_allocation_locked() above failed to |
abdfc822206f
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|
940 // allocate a new region. So the mutator alloc region should be NULL. |
abdfc822206f
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|
941 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
abdfc822206f
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|
942 |
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|
943 if (GC_locker::is_active_and_needs_gc()) { |
abdfc822206f
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|
944 if (g1_policy()->can_expand_young_list()) { |
3914
20213c8a3c40
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|
945 // No need for an ergo verbose message here, |
20213c8a3c40
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|
946 // can_expand_young_list() does this when it returns true. |
2433
abdfc822206f
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|
947 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
abdfc822206f
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|
948 false /* bot_updates */); |
abdfc822206f
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diff
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|
949 if (result != NULL) { |
abdfc822206f
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|
950 return result; |
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|
951 } |
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|
952 } |
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|
953 should_try_gc = false; |
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|
954 } else { |
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|
955 // Read the GC count while still holding the Heap_lock. |
4910
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|
956 gc_count_before = total_collections(); |
2433
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|
957 should_try_gc = true; |
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|
958 } |
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|
959 } |
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|
960 |
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|
961 if (should_try_gc) { |
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|
962 bool succeeded; |
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|
963 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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|
964 if (result != NULL) { |
abdfc822206f
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|
965 assert(succeeded, "only way to get back a non-NULL result"); |
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|
966 return result; |
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|
967 } |
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|
968 |
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|
969 if (succeeded) { |
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|
970 // If we get here we successfully scheduled a collection which |
abdfc822206f
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|
971 // failed to allocate. No point in trying to allocate |
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|
972 // further. We'll just return NULL. |
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|
973 MutexLockerEx x(Heap_lock); |
4910
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|
974 *gc_count_before_ret = total_collections(); |
2433
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|
975 return NULL; |
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|
976 } |
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|
977 } else { |
abdfc822206f
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|
978 GC_locker::stall_until_clear(); |
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|
979 } |
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|
980 |
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|
981 // We can reach here if we were unsuccessul in scheduling a |
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|
982 // collection (because another thread beat us to it) or if we were |
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|
983 // stalled due to the GC locker. In either can we should retry the |
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|
984 // allocation attempt in case another thread successfully |
abdfc822206f
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|
985 // performed a collection and reclaimed enough space. We do the |
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986 // first attempt (without holding the Heap_lock) here and the |
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987 // follow-on attempt will be at the start of the next loop |
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988 // iteration (after taking the Heap_lock). |
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989 result = _mutator_alloc_region.attempt_allocation(word_size, |
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990 false /* bot_updates */); |
5963
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991 if (result != NULL) { |
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992 return result; |
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993 } |
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994 |
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995 // Give a warning if we seem to be looping forever. |
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996 if ((QueuedAllocationWarningCount > 0) && |
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997 (try_count % QueuedAllocationWarningCount == 0)) { |
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998 warning("G1CollectedHeap::attempt_allocation_slow() " |
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999 "retries %d times", try_count); |
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1000 } |
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1001 } |
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1002 |
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1003 ShouldNotReachHere(); |
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1004 return NULL; |
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1005 } |
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1006 |
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1007 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1008 unsigned int * gc_count_before_ret) { |
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1009 // The structure of this method has a lot of similarities to |
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1010 // attempt_allocation_slow(). The reason these two were not merged |
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1011 // into a single one is that such a method would require several "if |
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1012 // allocation is not humongous do this, otherwise do that" |
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1013 // conditional paths which would obscure its flow. In fact, an early |
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1014 // version of this code did use a unified method which was harder to |
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1015 // follow and, as a result, it had subtle bugs that were hard to |
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1016 // track down. So keeping these two methods separate allows each to |
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1017 // be more readable. It will be good to keep these two in sync as |
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1018 // much as possible. |
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1019 |
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1020 assert_heap_not_locked_and_not_at_safepoint(); |
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1021 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1022 "should only be called for humongous allocations"); |
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1023 |
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1024 // Humongous objects can exhaust the heap quickly, so we should check if we |
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1025 // need to start a marking cycle at each humongous object allocation. We do |
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1026 // the check before we do the actual allocation. The reason for doing it |
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1027 // before the allocation is that we avoid having to keep track of the newly |
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1028 // allocated memory while we do a GC. |
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1029 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
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1030 word_size)) { |
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1031 collect(GCCause::_g1_humongous_allocation); |
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1032 } |
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1033 |
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1034 // We will loop until a) we manage to successfully perform the |
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1035 // allocation or b) we successfully schedule a collection which |
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1036 // fails to perform the allocation. b) is the only case when we'll |
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1037 // return NULL. |
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1038 HeapWord* result = NULL; |
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1039 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1040 bool should_try_gc; |
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1041 unsigned int gc_count_before; |
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1042 |
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1043 { |
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1044 MutexLockerEx x(Heap_lock); |
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1045 |
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1046 // Given that humongous objects are not allocated in young |
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1047 // regions, we'll first try to do the allocation without doing a |
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1048 // collection hoping that there's enough space in the heap. |
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1049 result = humongous_obj_allocate(word_size); |
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1050 if (result != NULL) { |
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1051 return result; |
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1052 } |
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1053 |
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1054 if (GC_locker::is_active_and_needs_gc()) { |
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1055 should_try_gc = false; |
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1056 } else { |
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1057 // Read the GC count while still holding the Heap_lock. |
4910
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1058 gc_count_before = total_collections(); |
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1059 should_try_gc = true; |
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1060 } |
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1061 } |
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1062 |
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1063 if (should_try_gc) { |
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1064 // If we failed to allocate the humongous object, we should try to |
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1065 // do a collection pause (if we're allowed) in case it reclaims |
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1066 // enough space for the allocation to succeed after the pause. |
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1067 |
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1068 bool succeeded; |
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1069 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1070 if (result != NULL) { |
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1071 assert(succeeded, "only way to get back a non-NULL result"); |
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1072 return result; |
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1073 } |
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1074 |
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1075 if (succeeded) { |
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1076 // If we get here we successfully scheduled a collection which |
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1077 // failed to allocate. No point in trying to allocate |
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1078 // further. We'll just return NULL. |
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1079 MutexLockerEx x(Heap_lock); |
4910
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1080 *gc_count_before_ret = total_collections(); |
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1081 return NULL; |
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1082 } |
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1083 } else { |
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1084 GC_locker::stall_until_clear(); |
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1085 } |
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1086 |
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1087 // We can reach here if we were unsuccessul in scheduling a |
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1088 // collection (because another thread beat us to it) or if we were |
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1089 // stalled due to the GC locker. In either can we should retry the |
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1090 // allocation attempt in case another thread successfully |
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1091 // performed a collection and reclaimed enough space. Give a |
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1092 // warning if we seem to be looping forever. |
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1093 |
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1094 if ((QueuedAllocationWarningCount > 0) && |
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1095 (try_count % QueuedAllocationWarningCount == 0)) { |
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1096 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1097 "retries %d times", try_count); |
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1098 } |
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1099 } |
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1100 |
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1101 ShouldNotReachHere(); |
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1102 return NULL; |
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1103 } |
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1104 |
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1105 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1106 bool expect_null_mutator_alloc_region) { |
2152 | 1107 assert_at_safepoint(true /* should_be_vm_thread */); |
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1108 assert(_mutator_alloc_region.get() == NULL || |
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1109 !expect_null_mutator_alloc_region, |
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1110 "the current alloc region was unexpectedly found to be non-NULL"); |
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1111 |
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1112 if (!isHumongous(word_size)) { |
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1113 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1114 false /* bot_updates */); |
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1115 } else { |
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1116 HeapWord* result = humongous_obj_allocate(word_size); |
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1117 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
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1118 g1_policy()->set_initiate_conc_mark_if_possible(); |
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1119 } |
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1120 return result; |
2433
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1121 } |
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1122 |
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1123 ShouldNotReachHere(); |
342 | 1124 } |
1125 | |
1126 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1127 ModRefBarrierSet* _mr_bs; | |
1128 public: | |
1129 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1130 bool doHeapRegion(HeapRegion* r) { | |
1131 r->reset_gc_time_stamp(); | |
1132 if (r->continuesHumongous()) | |
1133 return false; | |
1134 HeapRegionRemSet* hrrs = r->rem_set(); | |
1135 if (hrrs != NULL) hrrs->clear(); | |
1136 // You might think here that we could clear just the cards | |
1137 // corresponding to the used region. But no: if we leave a dirty card | |
1138 // in a region we might allocate into, then it would prevent that card | |
1139 // from being enqueued, and cause it to be missed. | |
1140 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1141 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1142 return false; | |
1143 } | |
1144 }; | |
1145 | |
1146 | |
1147 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1148 ModRefBarrierSet* _mr_bs; | |
1149 public: | |
1150 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1151 bool doHeapRegion(HeapRegion* r) { | |
1152 if (r->continuesHumongous()) return false; | |
1153 if (r->used_region().word_size() != 0) { | |
1154 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1155 } | |
1156 return false; | |
1157 } | |
1158 }; | |
1159 | |
626
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1160 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1161 G1CollectedHeap* _g1h; |
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1162 UpdateRSOopClosure _cl; |
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1163 int _worker_i; |
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1164 public: |
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1165 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1166 _cl(g1->g1_rem_set(), worker_i), |
626
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1167 _worker_i(worker_i), |
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1168 _g1h(g1) |
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1169 { } |
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1170 |
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1171 bool doHeapRegion(HeapRegion* r) { |
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1172 if (!r->continuesHumongous()) { |
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1173 _cl.set_from(r); |
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1174 r->oop_iterate(&_cl); |
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1175 } |
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1176 return false; |
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1177 } |
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1178 }; |
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1179 |
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1180 class ParRebuildRSTask: public AbstractGangTask { |
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1181 G1CollectedHeap* _g1; |
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1182 public: |
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1183 ParRebuildRSTask(G1CollectedHeap* g1) |
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1184 : AbstractGangTask("ParRebuildRSTask"), |
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1185 _g1(g1) |
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1186 { } |
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1187 |
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1188 void work(uint worker_id) { |
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1189 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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1190 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
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1191 _g1->workers()->active_workers(), |
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1192 HeapRegion::RebuildRSClaimValue); |
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1193 } |
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1194 }; |
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1195 |
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1196 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1197 private: |
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1198 G1HRPrinter* _hr_printer; |
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1199 public: |
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1200 bool doHeapRegion(HeapRegion* hr) { |
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1201 assert(!hr->is_young(), "not expecting to find young regions"); |
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1202 // We only generate output for non-empty regions. |
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1203 if (!hr->is_empty()) { |
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1204 if (!hr->isHumongous()) { |
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1205 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1206 } else if (hr->startsHumongous()) { |
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1207 if (hr->capacity() == HeapRegion::GrainBytes) { |
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1208 // single humongous region |
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1209 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1210 } else { |
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1211 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1212 } |
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1213 } else { |
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1214 assert(hr->continuesHumongous(), "only way to get here"); |
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1215 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1216 } |
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1217 } |
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1218 return false; |
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1219 } |
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1220 |
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1221 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1222 : _hr_printer(hr_printer) { } |
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1223 }; |
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1224 |
1973 | 1225 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1226 bool clear_all_soft_refs, |
342 | 1227 size_t word_size) { |
2152 | 1228 assert_at_safepoint(true /* should_be_vm_thread */); |
1229 | |
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1230 if (GC_locker::check_active_before_gc()) { |
1973 | 1231 return false; |
1359
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1232 } |
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1233 |
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1234 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1235 ResourceMark rm; |
1236 | |
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1237 print_heap_before_gc(); |
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1238 |
4072 | 1239 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1240 verify_region_sets_optional(); |
342 | 1241 |
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1242 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1243 collector_policy()->should_clear_all_soft_refs(); |
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1244 |
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1245 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1246 |
342 | 1247 { |
1248 IsGCActiveMark x; | |
1249 | |
1250 // Timing | |
6030 | 1251 assert(gc_cause() != GCCause::_java_lang_system_gc || explicit_gc, "invariant"); |
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1252 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
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1253 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
6030 | 1254 |
1255 char verbose_str[128]; | |
1256 sprintf(verbose_str, "Full GC (%s)", GCCause::to_string(gc_cause())); | |
1257 TraceTime t(verbose_str, G1Log::fine(), true, gclog_or_tty); | |
342 | 1258 |
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1259 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
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1260 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1261 |
342 | 1262 double start = os::elapsedTime(); |
1263 g1_policy()->record_full_collection_start(); | |
1264 | |
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1265 // Note: When we have a more flexible GC logging framework that |
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1266 // allows us to add optional attributes to a GC log record we |
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1267 // could consider timing and reporting how long we wait in the |
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1268 // following two methods. |
2152 | 1269 wait_while_free_regions_coming(); |
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1270 // If we start the compaction before the CM threads finish |
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1271 // scanning the root regions we might trip them over as we'll |
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1272 // be moving objects / updating references. So let's wait until |
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1273 // they are done. By telling them to abort, they should complete |
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1274 // early. |
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1275 _cm->root_regions()->abort(); |
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1276 _cm->root_regions()->wait_until_scan_finished(); |
2361 | 1277 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1278 |
342 | 1279 gc_prologue(true); |
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1280 increment_total_collections(true /* full gc */); |
342 | 1281 |
1282 size_t g1h_prev_used = used(); | |
1283 assert(used() == recalculate_used(), "Should be equal"); | |
1284 | |
1285 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1286 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1287 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1288 prepare_for_verify(); |
6008 | 1289 Universe::verify(/* silent */ false, |
3772
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1290 /* option */ VerifyOption_G1UsePrevMarking); |
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1291 |
342 | 1292 } |
3869
7f776886a215
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|
1293 pre_full_gc_dump(); |
342 | 1294 |
1295 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1296 | |
3979
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1297 // Disable discovery and empty the discovered lists |
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|
1298 // for the CM ref processor. |
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1299 ref_processor_cm()->disable_discovery(); |
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1300 ref_processor_cm()->abandon_partial_discovery(); |
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1301 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1302 |
1303 // Abandon current iterations of concurrent marking and concurrent | |
4837
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1304 // refinement, if any are in progress. We have to do this before |
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1305 // wait_until_scan_finished() below. |
342 | 1306 concurrent_mark()->abort(); |
1307 | |
1308 // Make sure we'll choose a new allocation region afterwards. | |
2433
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|
1309 release_mutator_alloc_region(); |
636 | 1310 abandon_gc_alloc_regions(); |
1861 | 1311 g1_rem_set()->cleanupHRRS(); |
1394
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1312 |
3778
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1313 // We should call this after we retire any currently active alloc |
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1314 // regions so that all the ALLOC / RETIRE events are generated |
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1315 // before the start GC event. |
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1316 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1317 |
1394
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1318 // We may have added regions to the current incremental collection |
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1319 // set between the last GC or pause and now. We need to clear the |
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1320 // incremental collection set and then start rebuilding it afresh |
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1321 // after this full GC. |
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1322 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1323 g1_policy()->clear_incremental_cset(); |
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1324 g1_policy()->stop_incremental_cset_building(); |
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1325 |
4072 | 1326 tear_down_region_sets(false /* free_list_only */); |
4710 | 1327 g1_policy()->set_gcs_are_young(true); |
342 | 1328 |
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1329 // See the comments in g1CollectedHeap.hpp and |
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1330 // G1CollectedHeap::ref_processing_init() about |
1974
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1331 // how reference processing currently works in G1. |
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1332 |
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1333 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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1334 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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1335 |
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1336 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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1337 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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1338 |
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1339 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1340 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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1341 |
342 | 1342 // Do collection work |
1343 { | |
1344 HandleMark hm; // Discard invalid handles created during gc | |
3979
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1345 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1346 } |
3979
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|
1347 |
2152 | 1348 assert(free_regions() == 0, "we should not have added any free regions"); |
4072 | 1349 rebuild_region_sets(false /* free_list_only */); |
342 | 1350 |
3979
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|
1351 // Enqueue any discovered reference objects that have |
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|
1352 // not been removed from the discovered lists. |
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|
1353 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1354 |
1355 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1356 | |
1089
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|
1357 MemoryService::track_memory_usage(); |
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|
1358 |
342 | 1359 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1360 HandleMark hm; // Discard invalid handles created during verification | |
1361 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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diff
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|
1362 prepare_for_verify(); |
6008 | 1363 Universe::verify(/* silent */ false, |
3772
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|
1364 /* option */ VerifyOption_G1UsePrevMarking); |
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1365 |
342 | 1366 } |
3979
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|
1367 |
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|
1368 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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|
1369 ref_processor_stw()->verify_no_references_recorded(); |
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|
1370 |
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|
1371 // Note: since we've just done a full GC, concurrent |
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|
1372 // marking is no longer active. Therefore we need not |
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|
1373 // re-enable reference discovery for the CM ref processor. |
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|
1374 // That will be done at the start of the next marking cycle. |
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|
1375 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1376 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1377 |
1378 reset_gc_time_stamp(); | |
1379 // Since everything potentially moved, we will clear all remembered | |
626
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1380 // sets, and clear all cards. Later we will rebuild remebered |
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1381 // sets. We will also reset the GC time stamps of the regions. |
342 | 1382 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1383 heap_region_iterate(&rs_clear); | |
1384 | |
1385 // Resize the heap if necessary. | |
1656
4e5661ba9d98
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|
1386 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1387 |
3778
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1388 if (_hr_printer.is_active()) { |
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1389 // We should do this after we potentially resize the heap so |
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|
1390 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1391 // the end GC event. |
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|
1392 |
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|
1393 PostCompactionPrinterClosure cl(hr_printer()); |
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|
1394 heap_region_iterate(&cl); |
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|
1395 |
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|
1396 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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|
1397 } |
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|
1398 |
342 | 1399 if (_cg1r->use_cache()) { |
1400 _cg1r->clear_and_record_card_counts(); | |
1401 _cg1r->clear_hot_cache(); | |
1402 } | |
1403 | |
626
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|
1404 // Rebuild remembered sets of all regions. |
1833
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diff
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|
1405 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4728
441e946dc1af
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diff
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|
1406 uint n_workers = |
4095
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|
1407 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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1408 workers()->active_workers(), |
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|
1409 Threads::number_of_non_daemon_threads()); |
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|
1410 assert(UseDynamicNumberOfGCThreads || |
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|
1411 n_workers == workers()->total_workers(), |
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1412 "If not dynamic should be using all the workers"); |
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|
1413 workers()->set_active_workers(n_workers); |
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|
1414 // Set parallel threads in the heap (_n_par_threads) only |
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|
1415 // before a parallel phase and always reset it to 0 after |
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1416 // the phase so that the number of parallel threads does |
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1417 // no get carried forward to a serial phase where there |
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|
1418 // may be code that is "possibly_parallel". |
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|
1419 set_par_threads(n_workers); |
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|
1420 |
626
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1421 ParRebuildRSTask rebuild_rs_task(this); |
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1422 assert(check_heap_region_claim_values( |
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|
1423 HeapRegion::InitialClaimValue), "sanity check"); |
4095
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1424 assert(UseDynamicNumberOfGCThreads || |
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|
1425 workers()->active_workers() == workers()->total_workers(), |
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|
1426 "Unless dynamic should use total workers"); |
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|
1427 // Use the most recent number of active workers |
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|
1428 assert(workers()->active_workers() > 0, |
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|
1429 "Active workers not properly set"); |
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|
1430 set_par_threads(workers()->active_workers()); |
626
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1431 workers()->run_task(&rebuild_rs_task); |
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|
1432 set_par_threads(0); |
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|
1433 assert(check_heap_region_claim_values( |
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|
1434 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1435 reset_heap_region_claim_values(); |
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|
1436 } else { |
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|
1437 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1438 heap_region_iterate(&rebuild_rs); |
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|
1439 } |
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|
1440 |
6007
5c86f8211d1e
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diff
changeset
|
1441 if (G1Log::fine()) { |
342 | 1442 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); |
1443 } | |
1444 | |
1445 if (true) { // FIXME | |
1446 // Ask the permanent generation to adjust size for full collections | |
1447 perm()->compute_new_size(); | |
1448 } | |
1449 | |
1394
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1450 // Start a new incremental collection set for the next pause |
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1451 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1452 g1_policy()->start_incremental_cset_building(); |
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1453 |
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1454 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1455 // regions to the incremental collection set for the next |
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1456 // evacuation pause. |
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1457 clear_cset_fast_test(); |
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|
1458 |
2433
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|
1459 init_mutator_alloc_region(); |
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1460 |
342 | 1461 double end = os::elapsedTime(); |
1462 g1_policy()->record_full_collection_end(); | |
1463 | |
546
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|
1464 #ifdef TRACESPINNING |
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1465 ParallelTaskTerminator::print_termination_counts(); |
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1466 #endif |
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1467 |
342 | 1468 gc_epilogue(true); |
1469 | |
794 | 1470 // Discard all rset updates |
1471 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1472 assert(!G1DeferredRSUpdate |
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1473 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1474 } |
1475 | |
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1476 _young_list->reset_sampled_info(); |
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1477 // At this point there should be no regions in the |
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1478 // entire heap tagged as young. |
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1479 assert( check_young_list_empty(true /* check_heap */), |
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1480 "young list should be empty at this point"); |
838
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1481 |
1656
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1482 // Update the number of full collections that have been completed. |
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1483 increment_full_collections_completed(false /* concurrent */); |
1656
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1484 |
3766 | 1485 _hrs.verify_optional(); |
2152 | 1486 verify_region_sets_optional(); |
1487 | |
4872
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1488 print_heap_after_gc(); |
3980
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1489 g1mm()->update_sizes(); |
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1490 post_full_gc_dump(); |
1973 | 1491 |
1492 return true; | |
342 | 1493 } |
1494 | |
1495 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1496 // do_collection() will return whether it succeeded in performing |
1497 // the GC. Currently, there is no facility on the | |
1498 // do_full_collection() API to notify the caller than the collection | |
1499 // did not succeed (e.g., because it was locked out by the GC | |
1500 // locker). So, right now, we'll ignore the return value. | |
1501 bool dummy = do_collection(true, /* explicit_gc */ | |
1502 clear_all_soft_refs, | |
1503 0 /* word_size */); | |
342 | 1504 } |
1505 | |
1506 // This code is mostly copied from TenuredGeneration. | |
1507 void | |
1508 G1CollectedHeap:: | |
1509 resize_if_necessary_after_full_collection(size_t word_size) { | |
1510 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1511 | |
1512 // Include the current allocation, if any, and bytes that will be | |
1513 // pre-allocated to support collections, as "used". | |
1514 const size_t used_after_gc = used(); | |
1515 const size_t capacity_after_gc = capacity(); | |
1516 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1517 | |
1717
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1518 // This is enforced in arguments.cpp. |
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1519 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1520 "otherwise the code below doesn't make sense"); |
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1521 |
342 | 1522 // We don't have floating point command-line arguments |
1717
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1523 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1524 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1525 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1526 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1527 | |
1717
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1528 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1529 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1530 |
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1531 // We have to be careful here as these two calculations can overflow |
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1532 // 32-bit size_t's. |
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1533 double used_after_gc_d = (double) used_after_gc; |
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1534 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1535 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1536 |
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1537 // Let's make sure that they are both under the max heap size, which |
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1538 // by default will make them fit into a size_t. |
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1539 double desired_capacity_upper_bound = (double) max_heap_size; |
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1540 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1541 desired_capacity_upper_bound); |
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1542 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1543 desired_capacity_upper_bound); |
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1544 |
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1545 // We can now safely turn them into size_t's. |
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1546 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1547 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1548 |
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1549 // This assert only makes sense here, before we adjust them |
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1550 // with respect to the min and max heap size. |
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1551 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1552 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1553 "maximum_desired_capacity = "SIZE_FORMAT, |
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1554 minimum_desired_capacity, maximum_desired_capacity)); |
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1555 |
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|
1556 // Should not be greater than the heap max size. No need to adjust |
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1557 // it with respect to the heap min size as it's a lower bound (i.e., |
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|
1558 // we'll try to make the capacity larger than it, not smaller). |
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|
1559 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1560 // Should not be less than the heap min size. No need to adjust it |
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1561 // with respect to the heap max size as it's an upper bound (i.e., |
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|
1562 // we'll try to make the capacity smaller than it, not greater). |
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|
1563 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1564 |
1717
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1565 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1566 // Don't expand unless it's significant |
1567 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
3914
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1568 ergo_verbose4(ErgoHeapSizing, |
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1569 "attempt heap expansion", |
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1570 ergo_format_reason("capacity lower than " |
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1571 "min desired capacity after Full GC") |
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|
1572 ergo_format_byte("capacity") |
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|
1573 ergo_format_byte("occupancy") |
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|
1574 ergo_format_byte_perc("min desired capacity"), |
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1575 capacity_after_gc, used_after_gc, |
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1576 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1577 expand(expand_bytes); |
342 | 1578 |
1579 // No expansion, now see if we want to shrink | |
1717
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1580 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1581 // Capacity too large, compute shrinking size |
1582 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
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1583 ergo_verbose4(ErgoHeapSizing, |
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1584 "attempt heap shrinking", |
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1585 ergo_format_reason("capacity higher than " |
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1586 "max desired capacity after Full GC") |
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1587 ergo_format_byte("capacity") |
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1588 ergo_format_byte("occupancy") |
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1589 ergo_format_byte_perc("max desired capacity"), |
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1590 capacity_after_gc, used_after_gc, |
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|
1591 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1592 shrink(shrink_bytes); |
1593 } | |
1594 } | |
1595 | |
1596 | |
1597 HeapWord* | |
1973 | 1598 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1599 bool* succeeded) { | |
2152 | 1600 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1601 |
1602 *succeeded = true; | |
1603 // Let's attempt the allocation first. | |
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|
1604 HeapWord* result = |
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1605 attempt_allocation_at_safepoint(word_size, |
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1606 false /* expect_null_mutator_alloc_region */); |
1973 | 1607 if (result != NULL) { |
1608 assert(*succeeded, "sanity"); | |
1609 return result; | |
1610 } | |
342 | 1611 |
1612 // In a G1 heap, we're supposed to keep allocation from failing by | |
1613 // incremental pauses. Therefore, at least for now, we'll favor | |
1614 // expansion over collection. (This might change in the future if we can | |
1615 // do something smarter than full collection to satisfy a failed alloc.) | |
1616 result = expand_and_allocate(word_size); | |
1617 if (result != NULL) { | |
1973 | 1618 assert(*succeeded, "sanity"); |
342 | 1619 return result; |
1620 } | |
1621 | |
1973 | 1622 // Expansion didn't work, we'll try to do a Full GC. |
1623 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1624 false, /* clear_all_soft_refs */ | |
1625 word_size); | |
1626 if (!gc_succeeded) { | |
1627 *succeeded = false; | |
1628 return NULL; | |
1629 } | |
1630 | |
1631 // Retry the allocation | |
1632 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1633 true /* expect_null_mutator_alloc_region */); |
342 | 1634 if (result != NULL) { |
1973 | 1635 assert(*succeeded, "sanity"); |
342 | 1636 return result; |
1637 } | |
1638 | |
1973 | 1639 // Then, try a Full GC that will collect all soft references. |
1640 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1641 true, /* clear_all_soft_refs */ | |
1642 word_size); | |
1643 if (!gc_succeeded) { | |
1644 *succeeded = false; | |
1645 return NULL; | |
1646 } | |
1647 | |
1648 // Retry the allocation once more | |
1649 result = attempt_allocation_at_safepoint(word_size, | |
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1650 true /* expect_null_mutator_alloc_region */); |
342 | 1651 if (result != NULL) { |
1973 | 1652 assert(*succeeded, "sanity"); |
342 | 1653 return result; |
1654 } | |
1655 | |
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1656 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1657 "Flag should have been handled and cleared prior to this point"); |
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1658 |
342 | 1659 // What else? We might try synchronous finalization later. If the total |
1660 // space available is large enough for the allocation, then a more | |
1661 // complete compaction phase than we've tried so far might be | |
1662 // appropriate. | |
1973 | 1663 assert(*succeeded, "sanity"); |
342 | 1664 return NULL; |
1665 } | |
1666 | |
1667 // Attempting to expand the heap sufficiently | |
1668 // to support an allocation of the given "word_size". If | |
1669 // successful, perform the allocation and return the address of the | |
1670 // allocated block, or else "NULL". | |
1671 | |
1672 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1673 assert_at_safepoint(true /* should_be_vm_thread */); |
1674 | |
1675 verify_region_sets_optional(); | |
1973 | 1676 |
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1677 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1678 ergo_verbose1(ErgoHeapSizing, |
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1679 "attempt heap expansion", |
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1680 ergo_format_reason("allocation request failed") |
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1681 ergo_format_byte("allocation request"), |
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1682 word_size * HeapWordSize); |
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1683 if (expand(expand_bytes)) { |
3766 | 1684 _hrs.verify_optional(); |
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1685 verify_region_sets_optional(); |
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1686 return attempt_allocation_at_safepoint(word_size, |
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1687 false /* expect_null_mutator_alloc_region */); |
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1688 } |
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1689 return NULL; |
342 | 1690 } |
1691 | |
3766 | 1692 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1693 HeapWord* new_end) { | |
1694 assert(old_end != new_end, "don't call this otherwise"); | |
1695 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1696 | |
1697 // Update the committed mem region. | |
1698 _g1_committed.set_end(new_end); | |
1699 // Tell the card table about the update. | |
1700 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1701 // Tell the BOT about the update. | |
1702 _bot_shared->resize(_g1_committed.word_size()); | |
1703 } | |
1704 | |
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1705 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1706 size_t old_mem_size = _g1_storage.committed_size(); |
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1707 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1708 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1709 HeapRegion::GrainBytes); | |
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1710 ergo_verbose2(ErgoHeapSizing, |
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1711 "expand the heap", |
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1712 ergo_format_byte("requested expansion amount") |
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1713 ergo_format_byte("attempted expansion amount"), |
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1714 expand_bytes, aligned_expand_bytes); |
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1715 |
3766 | 1716 // First commit the memory. |
1717 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1718 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1719 if (successful) { |
3766 | 1720 // Then propagate this update to the necessary data structures. |
1721 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1722 update_committed_space(old_end, new_end); | |
1723 | |
1724 FreeRegionList expansion_list("Local Expansion List"); | |
1725 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1726 assert(mr.start() == old_end, "post-condition"); | |
1727 // mr might be a smaller region than what was requested if | |
1728 // expand_by() was unable to allocate the HeapRegion instances | |
1729 assert(mr.end() <= new_end, "post-condition"); | |
1730 | |
1731 size_t actual_expand_bytes = mr.byte_size(); | |
1732 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1733 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1734 "post-condition"); | |
1735 if (actual_expand_bytes < aligned_expand_bytes) { | |
1736 // We could not expand _hrs to the desired size. In this case we | |
1737 // need to shrink the committed space accordingly. | |
1738 assert(mr.end() < new_end, "invariant"); | |
1739 | |
1740 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1741 // First uncommit the memory. | |
1742 _g1_storage.shrink_by(diff_bytes); | |
1743 // Then propagate this update to the necessary data structures. | |
1744 update_committed_space(new_end, mr.end()); | |
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1745 } |
3766 | 1746 _free_list.add_as_tail(&expansion_list); |
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1747 |
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1748 if (_hr_printer.is_active()) { |
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1749 HeapWord* curr = mr.start(); |
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1750 while (curr < mr.end()) { |
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1751 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1752 _hr_printer.commit(curr, curr_end); |
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1753 curr = curr_end; |
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1754 } |
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1755 assert(curr == mr.end(), "post-condition"); |
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1756 } |
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1757 g1_policy()->record_new_heap_size(n_regions()); |
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1758 } else { |
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1759 ergo_verbose0(ErgoHeapSizing, |
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1760 "did not expand the heap", |
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1761 ergo_format_reason("heap expansion operation failed")); |
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1762 // The expansion of the virtual storage space was unsuccessful. |
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1763 // Let's see if it was because we ran out of swap. |
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1764 if (G1ExitOnExpansionFailure && |
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1765 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1766 // We had head room... |
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1767 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1768 } |
1769 } | |
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1770 return successful; |
342 | 1771 } |
1772 | |
3766 | 1773 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1774 size_t old_mem_size = _g1_storage.committed_size(); |
1775 size_t aligned_shrink_bytes = | |
1776 ReservedSpace::page_align_size_down(shrink_bytes); | |
1777 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1778 HeapRegion::GrainBytes); | |
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1779 uint num_regions_deleted = 0; |
3766 | 1780 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1781 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1782 assert(mr.end() == old_end, "post-condition"); | |
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1783 |
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1784 ergo_verbose3(ErgoHeapSizing, |
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1785 "shrink the heap", |
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1786 ergo_format_byte("requested shrinking amount") |
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1787 ergo_format_byte("aligned shrinking amount") |
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1788 ergo_format_byte("attempted shrinking amount"), |
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1789 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1790 if (mr.byte_size() > 0) { |
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1791 if (_hr_printer.is_active()) { |
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1792 HeapWord* curr = mr.end(); |
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1793 while (curr > mr.start()) { |
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1794 HeapWord* curr_end = curr; |
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1795 curr -= HeapRegion::GrainWords; |
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1796 _hr_printer.uncommit(curr, curr_end); |
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1797 } |
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1798 assert(curr == mr.start(), "post-condition"); |
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1799 } |
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1800 |
342 | 1801 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1802 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1803 assert(mr.start() == new_end, "post-condition"); | |
1804 | |
1805 _expansion_regions += num_regions_deleted; | |
1806 update_committed_space(old_end, new_end); | |
1807 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1808 g1_policy()->record_new_heap_size(n_regions()); |
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1809 } else { |
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1810 ergo_verbose0(ErgoHeapSizing, |
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1811 "did not shrink the heap", |
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1812 ergo_format_reason("heap shrinking operation failed")); |
342 | 1813 } |
1814 } | |
1815 | |
1816 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1817 verify_region_sets_optional(); |
1818 | |
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1819 // We should only reach here at the end of a Full GC which means we |
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1820 // should not not be holding to any GC alloc regions. The method |
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1821 // below will make sure of that and do any remaining clean up. |
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1822 abandon_gc_alloc_regions(); |
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1823 |
2152 | 1824 // Instead of tearing down / rebuilding the free lists here, we |
1825 // could instead use the remove_all_pending() method on free_list to | |
1826 // remove only the ones that we need to remove. | |
4072 | 1827 tear_down_region_sets(true /* free_list_only */); |
342 | 1828 shrink_helper(shrink_bytes); |
4072 | 1829 rebuild_region_sets(true /* free_list_only */); |
2152 | 1830 |
3766 | 1831 _hrs.verify_optional(); |
2152 | 1832 verify_region_sets_optional(); |
342 | 1833 } |
1834 | |
1835 // Public methods. | |
1836 | |
1837 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1838 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1839 #endif // _MSC_VER | |
1840 | |
1841 | |
1842 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1843 SharedHeap(policy_), | |
1844 _g1_policy(policy_), | |
1111 | 1845 _dirty_card_queue_set(false), |
1705 | 1846 _into_cset_dirty_card_queue_set(false), |
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1847 _is_alive_closure_cm(this), |
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1848 _is_alive_closure_stw(this), |
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1849 _ref_processor_cm(NULL), |
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1850 _ref_processor_stw(NULL), |
342 | 1851 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1852 _bot_shared(NULL), | |
1853 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1854 _evac_failure_scan_stack(NULL) , | |
1855 _mark_in_progress(false), | |
2152 | 1856 _cg1r(NULL), _summary_bytes_used(0), |
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1857 _g1mm(NULL), |
342 | 1858 _refine_cte_cl(NULL), |
1859 _full_collection(false), | |
2152 | 1860 _free_list("Master Free List"), |
1861 _secondary_free_list("Secondary Free List"), | |
4072 | 1862 _old_set("Old Set"), |
2152 | 1863 _humongous_set("Master Humongous Set"), |
1864 _free_regions_coming(false), | |
342 | 1865 _young_list(new YoungList(this)), |
1866 _gc_time_stamp(0), | |
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1867 _retained_old_gc_alloc_region(NULL), |
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1868 _expand_heap_after_alloc_failure(true), |
526 | 1869 _surviving_young_words(NULL), |
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1870 _full_collections_completed(0), |
526 | 1871 _in_cset_fast_test(NULL), |
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1872 _in_cset_fast_test_base(NULL), |
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1873 _dirty_cards_region_list(NULL), |
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1874 _worker_cset_start_region(NULL), |
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1875 _worker_cset_start_region_time_stamp(NULL) { |
342 | 1876 _g1h = this; // To catch bugs. |
1877 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1878 vm_exit_during_initialization("Failed necessary allocation."); | |
1879 } | |
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1880 |
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1881 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1882 |
342 | 1883 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1884 _task_queues = new RefToScanQueueSet(n_queues); | |
1885 | |
1886 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1887 assert(n_rem_sets > 0, "Invariant."); | |
1888 | |
1889 HeapRegionRemSetIterator** iter_arr = | |
1890 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1891 for (int i = 0; i < n_queues; i++) { | |
1892 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1893 } | |
1894 _rem_set_iterator = iter_arr; | |
1895 | |
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1896 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1897 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1898 |
342 | 1899 for (int i = 0; i < n_queues; i++) { |
1900 RefToScanQueue* q = new RefToScanQueue(); | |
1901 q->initialize(); | |
1902 _task_queues->register_queue(i, q); | |
1903 } | |
1904 | |
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1905 clear_cset_start_regions(); |
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1906 |
342 | 1907 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1908 } | |
1909 | |
1910 jint G1CollectedHeap::initialize() { | |
1166 | 1911 CollectedHeap::pre_initialize(); |
342 | 1912 os::enable_vtime(); |
1913 | |
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1914 G1Log::init(); |
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1915 |
342 | 1916 // Necessary to satisfy locking discipline assertions. |
1917 | |
1918 MutexLocker x(Heap_lock); | |
1919 | |
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1920 // We have to initialize the printer before committing the heap, as |
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1921 // it will be used then. |
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1922 _hr_printer.set_active(G1PrintHeapRegions); |
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1923 |
342 | 1924 // While there are no constraints in the GC code that HeapWordSize |
1925 // be any particular value, there are multiple other areas in the | |
1926 // system which believe this to be true (e.g. oop->object_size in some | |
1927 // cases incorrectly returns the size in wordSize units rather than | |
1928 // HeapWordSize). | |
1929 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1930 | |
1931 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1932 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1933 | |
1934 // Ensure that the sizes are properly aligned. | |
1935 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1936 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1937 | |
1938 _cg1r = new ConcurrentG1Refine(); | |
1939 | |
1940 // Reserve the maximum. | |
1941 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1942 // Includes the perm-gen. | |
642
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1943 |
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1944 // When compressed oops are enabled, the preferred heap base |
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1945 // is calculated by subtracting the requested size from the |
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1946 // 32Gb boundary and using the result as the base address for |
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1947 // heap reservation. If the requested size is not aligned to |
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1948 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1949 // into the ReservedHeapSpace constructor) then the actual |
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1950 // base of the reserved heap may end up differing from the |
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1951 // address that was requested (i.e. the preferred heap base). |
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1952 // If this happens then we could end up using a non-optimal |
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1953 // compressed oops mode. |
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1954 |
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1955 // Since max_byte_size is aligned to the size of a heap region (checked |
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1956 // above), we also need to align the perm gen size as it might not be. |
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1957 const size_t total_reserved = max_byte_size + |
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1958 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1959 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1960 |
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1961 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1962 |
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1963 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1964 UseLargePages, addr); |
642
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1965 |
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1966 if (UseCompressedOops) { |
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1967 if (addr != NULL && !heap_rs.is_reserved()) { |
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1968 // Failed to reserve at specified address - the requested memory |
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1969 // region is taken already, for example, by 'java' launcher. |
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1970 // Try again to reserver heap higher. |
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1971 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1972 |
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1973 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1974 UseLargePages, addr); |
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1975 |
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1976 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1977 // Failed to reserve at specified address again - give up. |
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1978 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1979 assert(addr == NULL, ""); |
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1980 |
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1981 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1982 UseLargePages, addr); |
642
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1983 heap_rs = heap_rs1; |
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1984 } else { |
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1985 heap_rs = heap_rs0; |
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1986 } |
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1987 } |
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1988 } |
342 | 1989 |
1990 if (!heap_rs.is_reserved()) { | |
1991 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1992 return JNI_ENOMEM; | |
1993 } | |
1994 | |
1995 // It is important to do this in a way such that concurrent readers can't | |
1996 // temporarily think somethings in the heap. (I've actually seen this | |
1997 // happen in asserts: DLD.) | |
1998 _reserved.set_word_size(0); | |
1999 _reserved.set_start((HeapWord*)heap_rs.base()); | |
2000 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
2001 | |
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2002 _expansion_regions = (uint) (max_byte_size / HeapRegion::GrainBytes); |
342 | 2003 |
2004 // Create the gen rem set (and barrier set) for the entire reserved region. | |
2005 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
2006 set_barrier_set(rem_set()->bs()); | |
2007 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
2008 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
2009 } else { | |
2010 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
2011 return JNI_ENOMEM; | |
2012 } | |
2013 | |
2014 // Also create a G1 rem set. | |
1861 | 2015 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
2016 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 2017 } else { |
1861 | 2018 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
2019 return JNI_ENOMEM; | |
342 | 2020 } |
2021 | |
2022 // Carve out the G1 part of the heap. | |
2023 | |
2024 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2025 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2026 g1_rs.size()/HeapWordSize); | |
2027 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
2028 | |
2029 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
2030 | |
2031 _g1_storage.initialize(g1_rs, 0); | |
2032 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2033 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
2034 (HeapWord*) _g1_reserved.end(), | |
2035 _expansion_regions); | |
342 | 2036 |
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2037 // 6843694 - ensure that the maximum region index can fit |
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2038 // in the remembered set structures. |
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2039 const uint max_region_idx = (1U << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
807
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2040 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2041 |
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2042 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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2043 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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2044 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2045 "too many cards per region"); |
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2046 |
2152 | 2047 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2048 | |
342 | 2049 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2050 heap_word_size(init_byte_size)); | |
2051 | |
2052 _g1h = this; | |
2053 | |
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2054 _in_cset_fast_test_length = max_regions(); |
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2055 _in_cset_fast_test_base = |
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2056 NEW_C_HEAP_ARRAY(bool, (size_t) _in_cset_fast_test_length); |
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2057 |
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2058 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2059 // beginning of the heap every time we want to index; basically |
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2060 // it's the same with what we do with the card table. |
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2061 _in_cset_fast_test = _in_cset_fast_test_base - |
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2062 ((uintx) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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1391
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|
2063 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2064 // Clear the _cset_fast_test bitmap in anticipation of adding |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
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|
2065 // regions to the incremental collection set for the first |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
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|
2066 // evacuation pause. |
1316cec51b4d
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diff
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|
2067 clear_cset_fast_test(); |
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|
2068 |
342 | 2069 // Create the ConcurrentMark data structure and thread. |
2070 // (Must do this late, so that "max_regions" is defined.) | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
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|
2071 _cm = new ConcurrentMark(heap_rs, max_regions()); |
342 | 2072 _cmThread = _cm->cmThread(); |
2073 | |
2074 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2075 HeapRegionRemSet::init_heap(max_regions()); | |
2076 | |
677 | 2077 // Now expand into the initial heap size. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
2078 if (!expand(init_byte_size)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
2079 vm_exit_during_initialization("Failed to allocate initial heap."); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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diff
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|
2080 return JNI_ENOMEM; |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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2173
diff
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|
2081 } |
342 | 2082 |
2083 // Perform any initialization actions delegated to the policy. | |
2084 g1_policy()->init(); | |
2085 | |
2086 _refine_cte_cl = | |
2087 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2088 g1_rem_set(), | |
2089 concurrent_g1_refine()); | |
2090 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2091 | |
2092 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2093 SATB_Q_FL_lock, | |
1111 | 2094 G1SATBProcessCompletedThreshold, |
342 | 2095 Shared_SATB_Q_lock); |
794 | 2096 |
2097 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2098 DirtyCardQ_FL_lock, | |
1111 | 2099 concurrent_g1_refine()->yellow_zone(), |
2100 concurrent_g1_refine()->red_zone(), | |
794 | 2101 Shared_DirtyCardQ_lock); |
2102 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
2103 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
2104 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
2105 DirtyCardQ_FL_lock, |
1111 | 2106 -1, // never trigger processing |
2107 -1, // no limit on length | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
2108 Shared_DirtyCardQ_lock, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
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|
2109 &JavaThread::dirty_card_queue_set()); |
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|
2110 } |
1705 | 2111 |
2112 // Initialize the card queue set used to hold cards containing | |
2113 // references into the collection set. | |
2114 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2115 DirtyCardQ_FL_lock, | |
2116 -1, // never trigger processing | |
2117 -1, // no limit on length | |
2118 Shared_DirtyCardQ_lock, | |
2119 &JavaThread::dirty_card_queue_set()); | |
2120 | |
342 | 2121 // In case we're keeping closure specialization stats, initialize those |
2122 // counts and that mechanism. | |
2123 SpecializationStats::clear(); | |
2124 | |
2125 // Do later initialization work for concurrent refinement. | |
2126 _cg1r->init(); | |
2127 | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
2128 // Here we allocate the dummy full region that is required by the |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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diff
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|
2129 // G1AllocRegion class. If we don't pass an address in the reserved |
abdfc822206f
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tonyp
parents:
2432
diff
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|
2130 // space here, lots of asserts fire. |
3766 | 2131 |
2132 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2133 _g1_reserved.start()); | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2134 // We'll re-use the same region whether the alloc region will |
abdfc822206f
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tonyp
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diff
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|
2135 // require BOT updates or not and, if it doesn't, then a non-young |
abdfc822206f
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tonyp
parents:
2432
diff
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|
2136 // region will complain that it cannot support allocations without |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2137 // BOT updates. So we'll tag the dummy region as young to avoid that. |
abdfc822206f
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tonyp
parents:
2432
diff
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|
2138 dummy_region->set_young(); |
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
2139 // Make sure it's full. |
abdfc822206f
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parents:
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diff
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|
2140 dummy_region->set_top(dummy_region->end()); |
abdfc822206f
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parents:
2432
diff
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|
2141 G1AllocRegion::setup(this, dummy_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
2142 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2143 init_mutator_alloc_region(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
2144 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
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|
2145 // 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
|
2146 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
2147 _g1mm = new G1MonitoringSupport(this); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
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|
2148 |
342 | 2149 return JNI_OK; |
2150 } | |
2151 | |
2152 void G1CollectedHeap::ref_processing_init() { | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1973
diff
changeset
|
2153 // 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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|
2154 // |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
2155 // * There are two reference processor instances. One is |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2156 // used to record and process discovered references |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2157 // during concurrent marking; the other is used to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2158 // record and process references during STW pauses |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2159 // (both full and incremental). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2160 // * Both ref processors need to 'span' the entire heap as |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2161 // the regions in the collection set may be dotted around. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2162 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2163 // * For the concurrent marking ref processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2164 // * Reference discovery is enabled at initial marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2165 // * Reference discovery is disabled and the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2166 // references processed etc during remarking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2167 // * Reference discovery is MT (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2168 // * Reference discovery requires a barrier (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2169 // * Reference processing may or may not be MT |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2170 // (depending on the value of ParallelRefProcEnabled |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2171 // and ParallelGCThreads). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2172 // * A full GC disables reference discovery by the CM |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2173 // ref processor and abandons any entries on it's |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2174 // discovered lists. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2175 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2176 // * For the STW processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2177 // * 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
|
2178 // * Processing and enqueueing during a full GC is non-MT. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2179 // * During a full GC, references are processed after marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2180 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2181 // * 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
|
2182 // of an incremental evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2183 // * References are processed near the end of a STW evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2184 // * For both types of GC: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2185 // * Discovery is atomic - i.e. not concurrent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2186 // * Reference discovery will not need a barrier. |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2187 |
342 | 2188 SharedHeap::ref_processing_init(); |
2189 MemRegion mr = reserved_region(); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2190 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2191 // Concurrent Mark ref processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2192 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2193 new ReferenceProcessor(mr, // span |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2194 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2195 // mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2196 (int) ParallelGCThreads, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2197 // degree of mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2198 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2199 // mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2200 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2201 // degree of mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2202 false, |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2203 // Reference discovery is not atomic |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2204 &_is_alive_closure_cm, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2205 // is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2206 // (for efficiency/performance) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2207 true); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2208 // Setting next fields of discovered |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2209 // lists requires a barrier. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2210 |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2211 // STW ref processor |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2212 _ref_processor_stw = |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2213 new ReferenceProcessor(mr, // span |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2214 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2215 // mt processing |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2216 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2217 // degree of mt processing |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2218 (ParallelGCThreads > 1), |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2219 // mt discovery |
4dfb2df418f2
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3973
diff
changeset
|
2220 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2221 // degree of mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2222 true, |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2223 // Reference discovery is atomic |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2224 &_is_alive_closure_stw, |
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parents:
3973
diff
changeset
|
2225 // is alive closure |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2226 // (for efficiency/performance) |
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parents:
3973
diff
changeset
|
2227 false); |
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diff
changeset
|
2228 // Setting next fields of discovered |
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|
2229 // lists requires a barrier. |
342 | 2230 } |
2231 | |
2232 size_t G1CollectedHeap::capacity() const { | |
2233 return _g1_committed.byte_size(); | |
2234 } | |
2235 | |
1705 | 2236 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2237 DirtyCardQueue* into_cset_dcq, | |
2238 bool concurrent, | |
342 | 2239 int worker_i) { |
889 | 2240 // Clean cards in the hot card cache |
1705 | 2241 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2242 |
342 | 2243 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2244 int n_completed_buffers = 0; | |
1705 | 2245 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2246 n_completed_buffers++; |
2247 } | |
2248 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2249 (double) n_completed_buffers); | |
2250 dcqs.clear_n_completed_buffers(); | |
2251 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2252 } | |
2253 | |
2254 | |
2255 // Computes the sum of the storage used by the various regions. | |
2256 | |
2257 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2258 assert(Heap_lock->owner() != NULL, |
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2259 "Should be owned on this thread's behalf."); |
342 | 2260 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2261 // 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
|
2262 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2263 if (hr != NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2264 result += hr->used(); |
342 | 2265 return result; |
2266 } | |
2267 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2268 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
|
2269 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
|
2270 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2271 } |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2272 |
342 | 2273 class SumUsedClosure: public HeapRegionClosure { |
2274 size_t _used; | |
2275 public: | |
2276 SumUsedClosure() : _used(0) {} | |
2277 bool doHeapRegion(HeapRegion* r) { | |
2278 if (!r->continuesHumongous()) { | |
2279 _used += r->used(); | |
2280 } | |
2281 return false; | |
2282 } | |
2283 size_t result() { return _used; } | |
2284 }; | |
2285 | |
2286 size_t G1CollectedHeap::recalculate_used() const { | |
2287 SumUsedClosure blk; | |
3766 | 2288 heap_region_iterate(&blk); |
342 | 2289 return blk.result(); |
2290 } | |
2291 | |
2292 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2293 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2294 // otherwise, is there space in the current allocation region? |
2295 | |
2296 // We need to store the current allocation region in a local variable | |
2297 // here. The problem is that this method doesn't take any locks and | |
2298 // there may be other threads which overwrite the current allocation | |
2299 // region field. attempt_allocation(), for example, sets it to NULL | |
2300 // and this can happen *after* the NULL check here but before the call | |
2301 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2302 // to be a problem in the optimized build, since the two loads of the | |
2303 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2304 HeapRegion* hr = _mutator_alloc_region.get(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2305 if (hr == NULL) { |
342 | 2306 return 0; |
2307 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2308 return hr->free(); |
342 | 2309 } |
2310 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2311 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
|
2312 switch (cause) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2313 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
|
2314 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
|
2315 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
|
2316 default: return false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2317 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2318 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2319 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2320 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2321 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2322 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2323 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2324 // 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
|
2325 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2326 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2327 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2328 // 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
|
2329 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2330 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2331 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2332 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2333 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2334 // 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
|
2335 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2336 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2337 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2338 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2339 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2340 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2341 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2342 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2343 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2344 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2345 // 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
|
2346 // 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
|
2347 // 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
|
2348 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2349 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2350 // We have already incremented _total_full_collections at the start |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2351 // of the GC, so total_full_collections() represents how many full |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2352 // collections have been started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2353 unsigned int full_collections_started = total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2354 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2355 // Given that this method is called at the end of a Full GC or of a |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2356 // concurrent cycle, and those can be nested (i.e., a Full GC can |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2357 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2358 // completed should be either one (in the case where there was no |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2359 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2360 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2361 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2362 // 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
parents:
1995
diff
changeset
|
2363 assert(concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2364 (full_collections_started == _full_collections_completed + 1) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2365 (full_collections_started == _full_collections_completed + 2), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2366 err_msg("for inner caller (Full GC): full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2367 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2368 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2369 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2370 // 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
parents:
1995
diff
changeset
|
2371 assert(!concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2372 (full_collections_started == _full_collections_completed + 1), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2373 err_msg("for outer caller (concurrent cycle): " |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2374 "full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2375 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2376 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2377 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2378 _full_collections_completed += 1; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2379 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2380 // 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
|
2381 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2382 // is set) so that if a waiter requests another System.gc() it doesn't |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2383 // incorrectly see that a marking cyle is still in progress. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2384 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2385 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2386 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2387 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2388 // This notify_all() will ensure that a thread that called |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2389 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2390 // and it's waiting for a full GC to finish will be woken up. It is |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2391 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2392 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2393 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2394 |
342 | 2395 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2396 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2397 GCCauseSetter gcs(this, cause); |
2398 switch (cause) { | |
2399 case GCCause::_heap_inspection: | |
2400 case GCCause::_heap_dump: { | |
2401 HandleMark hm; | |
2402 do_full_collection(false); // don't clear all soft refs | |
2403 break; | |
2404 } | |
2405 default: // XXX FIX ME | |
2406 ShouldNotReachHere(); // Unexpected use of this function | |
2407 } | |
2408 } | |
2409 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2410 void G1CollectedHeap::collect(GCCause::Cause cause) { |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2411 assert_heap_not_locked(); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2412 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2413 unsigned int gc_count_before; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2414 unsigned int full_gc_count_before; |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2415 bool retry_gc; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2416 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2417 do { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2418 retry_gc = false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2419 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2420 { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2421 MutexLocker ml(Heap_lock); |
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2422 |
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2423 // Read the GC count while holding the Heap_lock |
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2424 gc_count_before = total_collections(); |
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2425 full_gc_count_before = total_full_collections(); |
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2426 } |
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2427 |
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2428 if (should_do_concurrent_full_gc(cause)) { |
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2429 // Schedule an initial-mark evacuation pause that will start a |
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2430 // concurrent cycle. We're setting word_size to 0 which means that |
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2431 // we are not requesting a post-GC allocation. |
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2432 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2433 0, /* word_size */ |
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2434 true, /* should_initiate_conc_mark */ |
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2435 g1_policy()->max_pause_time_ms(), |
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2436 cause); |
5963
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2437 |
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2438 VMThread::execute(&op); |
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2439 if (!op.pause_succeeded()) { |
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2440 if (full_gc_count_before == total_full_collections()) { |
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2441 retry_gc = op.should_retry_gc(); |
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2442 } else { |
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2443 // A Full GC happened while we were trying to schedule the |
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2444 // initial-mark GC. No point in starting a new cycle given |
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2445 // that the whole heap was collected anyway. |
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2446 } |
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2447 |
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2448 if (retry_gc) { |
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2449 if (GC_locker::is_active_and_needs_gc()) { |
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2450 GC_locker::stall_until_clear(); |
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2451 } |
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2452 } |
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2453 } |
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2454 } else { |
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2455 if (cause == GCCause::_gc_locker |
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2456 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2457 |
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2458 // Schedule a standard evacuation pause. We're setting word_size |
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2459 // to 0 which means that we are not requesting a post-GC allocation. |
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2460 VM_G1IncCollectionPause op(gc_count_before, |
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2461 0, /* word_size */ |
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2462 false, /* should_initiate_conc_mark */ |
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2463 g1_policy()->max_pause_time_ms(), |
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2464 cause); |
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2465 VMThread::execute(&op); |
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2466 } else { |
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2467 // Schedule a Full GC. |
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2468 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2469 VMThread::execute(&op); |
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2470 } |
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2471 } |
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2472 } while (retry_gc); |
342 | 2473 } |
2474 | |
2475 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2476 if (_g1_committed.contains(p)) { |
2477 // Given that we know that p is in the committed space, | |
2478 // heap_region_containing_raw() should successfully | |
2479 // return the containing region. | |
2480 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2481 return hr->is_in(p); |
2482 } else { | |
2483 return _perm_gen->as_gen()->is_in(p); | |
2484 } | |
2485 } | |
2486 | |
2487 // Iteration functions. | |
2488 | |
2489 // Iterates an OopClosure over all ref-containing fields of objects | |
2490 // within a HeapRegion. | |
2491 | |
2492 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2493 MemRegion _mr; | |
2494 OopClosure* _cl; | |
2495 public: | |
2496 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2497 : _mr(mr), _cl(cl) {} | |
2498 bool doHeapRegion(HeapRegion* r) { | |
2499 if (! r->continuesHumongous()) { | |
2500 r->oop_iterate(_cl); | |
2501 } | |
2502 return false; | |
2503 } | |
2504 }; | |
2505 | |
678 | 2506 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2507 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2508 heap_region_iterate(&blk); |
678 | 2509 if (do_perm) { |
2510 perm_gen()->oop_iterate(cl); | |
2511 } | |
342 | 2512 } |
2513 | |
678 | 2514 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2515 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2516 heap_region_iterate(&blk); |
678 | 2517 if (do_perm) { |
2518 perm_gen()->oop_iterate(cl); | |
2519 } | |
342 | 2520 } |
2521 | |
2522 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2523 | |
2524 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2525 ObjectClosure* _cl; | |
2526 public: | |
2527 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2528 bool doHeapRegion(HeapRegion* r) { | |
2529 if (! r->continuesHumongous()) { | |
2530 r->object_iterate(_cl); | |
2531 } | |
2532 return false; | |
2533 } | |
2534 }; | |
2535 | |
678 | 2536 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2537 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2538 heap_region_iterate(&blk); |
678 | 2539 if (do_perm) { |
2540 perm_gen()->object_iterate(cl); | |
2541 } | |
342 | 2542 } |
2543 | |
2544 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2545 // FIXME: is this right? | |
2546 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2547 } | |
2548 | |
2549 // Calls a SpaceClosure on a HeapRegion. | |
2550 | |
2551 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2552 SpaceClosure* _cl; | |
2553 public: | |
2554 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2555 bool doHeapRegion(HeapRegion* r) { | |
2556 _cl->do_space(r); | |
2557 return false; | |
2558 } | |
2559 }; | |
2560 | |
2561 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2562 SpaceClosureRegionClosure blk(cl); | |
3766 | 2563 heap_region_iterate(&blk); |
342 | 2564 } |
2565 | |
3766 | 2566 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2567 _hrs.iterate(cl); | |
342 | 2568 } |
2569 | |
2570 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2571 HeapRegionClosure* cl) const { |
2572 _hrs.iterate_from(r, cl); | |
342 | 2573 } |
2574 | |
2575 void | |
2576 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
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2577 uint worker, |
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2578 uint no_of_par_workers, |
342 | 2579 jint claim_value) { |
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2580 const uint regions = n_regions(); |
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2581 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2582 no_of_par_workers : |
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2583 1); |
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2584 assert(UseDynamicNumberOfGCThreads || |
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2585 no_of_par_workers == workers()->total_workers(), |
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2586 "Non dynamic should use fixed number of workers"); |
355 | 2587 // try to spread out the starting points of the workers |
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2588 const uint start_index = regions / max_workers * worker; |
355 | 2589 |
2590 // each worker will actually look at all regions | |
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2591 for (uint count = 0; count < regions; ++count) { |
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2592 const uint index = (start_index + count) % regions; |
355 | 2593 assert(0 <= index && index < regions, "sanity"); |
2594 HeapRegion* r = region_at(index); | |
2595 // we'll ignore "continues humongous" regions (we'll process them | |
2596 // when we come across their corresponding "start humongous" | |
2597 // region) and regions already claimed | |
2598 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2599 continue; | |
2600 } | |
2601 // OK, try to claim it | |
342 | 2602 if (r->claimHeapRegion(claim_value)) { |
355 | 2603 // success! |
2604 assert(!r->continuesHumongous(), "sanity"); | |
2605 if (r->startsHumongous()) { | |
2606 // If the region is "starts humongous" we'll iterate over its | |
2607 // "continues humongous" first; in fact we'll do them | |
2608 // first. The order is important. In on case, calling the | |
2609 // closure on the "starts humongous" region might de-allocate | |
2610 // and clear all its "continues humongous" regions and, as a | |
2611 // result, we might end up processing them twice. So, we'll do | |
2612 // them first (notice: most closures will ignore them anyway) and | |
2613 // then we'll do the "starts humongous" region. | |
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2614 for (uint ch_index = index + 1; ch_index < regions; ++ch_index) { |
355 | 2615 HeapRegion* chr = region_at(ch_index); |
2616 | |
2617 // if the region has already been claimed or it's not | |
2618 // "continues humongous" we're done | |
2619 if (chr->claim_value() == claim_value || | |
2620 !chr->continuesHumongous()) { | |
2621 break; | |
2622 } | |
2623 | |
2624 // Noone should have claimed it directly. We can given | |
2625 // that we claimed its "starts humongous" region. | |
2626 assert(chr->claim_value() != claim_value, "sanity"); | |
2627 assert(chr->humongous_start_region() == r, "sanity"); | |
2628 | |
2629 if (chr->claimHeapRegion(claim_value)) { | |
2630 // we should always be able to claim it; noone else should | |
2631 // be trying to claim this region | |
2632 | |
2633 bool res2 = cl->doHeapRegion(chr); | |
2634 assert(!res2, "Should not abort"); | |
2635 | |
2636 // Right now, this holds (i.e., no closure that actually | |
2637 // does something with "continues humongous" regions | |
2638 // clears them). We might have to weaken it in the future, | |
2639 // but let's leave these two asserts here for extra safety. | |
2640 assert(chr->continuesHumongous(), "should still be the case"); | |
2641 assert(chr->humongous_start_region() == r, "sanity"); | |
2642 } else { | |
2643 guarantee(false, "we should not reach here"); | |
2644 } | |
2645 } | |
2646 } | |
2647 | |
2648 assert(!r->continuesHumongous(), "sanity"); | |
2649 bool res = cl->doHeapRegion(r); | |
2650 assert(!res, "Should not abort"); | |
2651 } | |
2652 } | |
2653 } | |
2654 | |
390 | 2655 class ResetClaimValuesClosure: public HeapRegionClosure { |
2656 public: | |
2657 bool doHeapRegion(HeapRegion* r) { | |
2658 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2659 return false; | |
2660 } | |
2661 }; | |
2662 | |
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2663 void G1CollectedHeap::reset_heap_region_claim_values() { |
390 | 2664 ResetClaimValuesClosure blk; |
2665 heap_region_iterate(&blk); | |
2666 } | |
2667 | |
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2668 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2669 ResetClaimValuesClosure blk; |
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2670 collection_set_iterate(&blk); |
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2671 } |
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2672 |
355 | 2673 #ifdef ASSERT |
2674 // This checks whether all regions in the heap have the correct claim | |
2675 // value. I also piggy-backed on this a check to ensure that the | |
2676 // humongous_start_region() information on "continues humongous" | |
2677 // regions is correct. | |
2678 | |
2679 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2680 private: | |
2681 jint _claim_value; | |
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2682 uint _failures; |
355 | 2683 HeapRegion* _sh_region; |
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2684 |
355 | 2685 public: |
2686 CheckClaimValuesClosure(jint claim_value) : | |
2687 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2688 bool doHeapRegion(HeapRegion* r) { | |
2689 if (r->claim_value() != _claim_value) { | |
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2690 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2691 "claim value = %d, should be %d", |
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2692 HR_FORMAT_PARAMS(r), |
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2693 r->claim_value(), _claim_value); |
355 | 2694 ++_failures; |
2695 } | |
2696 if (!r->isHumongous()) { | |
2697 _sh_region = NULL; | |
2698 } else if (r->startsHumongous()) { | |
2699 _sh_region = r; | |
2700 } else if (r->continuesHumongous()) { | |
2701 if (r->humongous_start_region() != _sh_region) { | |
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2702 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2703 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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|
2704 HR_FORMAT_PARAMS(r), |
355 | 2705 r->humongous_start_region(), |
2706 _sh_region); | |
2707 ++_failures; | |
342 | 2708 } |
2709 } | |
355 | 2710 return false; |
2711 } | |
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|
2712 uint failures() { return _failures; } |
355 | 2713 }; |
2714 | |
2715 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2716 CheckClaimValuesClosure cl(claim_value); | |
2717 heap_region_iterate(&cl); | |
2718 return cl.failures() == 0; | |
2719 } | |
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|
2720 |
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|
2721 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
6010
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|
2722 private: |
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|
2723 jint _claim_value; |
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|
2724 uint _failures; |
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|
2725 |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2726 public: |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2727 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
6010
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2728 _claim_value(claim_value), _failures(0) { } |
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|
2729 |
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|
2730 uint failures() { return _failures; } |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2731 |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2732 bool doHeapRegion(HeapRegion* hr) { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2733 assert(hr->in_collection_set(), "how?"); |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2734 assert(!hr->isHumongous(), "H-region in CSet"); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2735 if (hr->claim_value() != _claim_value) { |
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|
2736 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2737 "claim value = %d, should be %d", |
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|
2738 HR_FORMAT_PARAMS(hr), |
dc467e8b2c5e
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|
2739 hr->claim_value(), _claim_value); |
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|
2740 _failures += 1; |
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|
2741 } |
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|
2742 return false; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2743 } |
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|
2744 }; |
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|
2745 |
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|
2746 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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2747 CheckClaimValuesInCSetHRClosure cl(claim_value); |
dc467e8b2c5e
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|
2748 collection_set_iterate(&cl); |
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|
2749 return cl.failures() == 0; |
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|
2750 } |
355 | 2751 #endif // ASSERT |
342 | 2752 |
4709
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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2753 // Clear the cached CSet starting regions and (more importantly) |
fd2b426c30db
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|
2754 // the time stamps. Called when we reset the GC time stamp. |
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|
2755 void G1CollectedHeap::clear_cset_start_regions() { |
fd2b426c30db
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|
2756 assert(_worker_cset_start_region != NULL, "sanity"); |
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|
2757 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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|
2758 |
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|
2759 int n_queues = MAX2((int)ParallelGCThreads, 1); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2760 for (int i = 0; i < n_queues; i++) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2761 _worker_cset_start_region[i] = NULL; |
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|
2762 _worker_cset_start_region_time_stamp[i] = 0; |
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|
2763 } |
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changeset
|
2764 } |
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|
2765 |
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changeset
|
2766 // Given the id of a worker, obtain or calculate a suitable |
fd2b426c30db
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|
2767 // starting region for iterating over the current collection set. |
4097
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|
2768 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2769 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
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|
2770 |
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|
2771 HeapRegion* result = NULL; |
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2772 unsigned gc_time_stamp = get_gc_time_stamp(); |
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2773 |
fd2b426c30db
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|
2774 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
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|
2775 // Cached starting region for current worker was set |
fd2b426c30db
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changeset
|
2776 // during the current pause - so it's valid. |
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2777 // Note: the cached starting heap region may be NULL |
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parents:
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diff
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|
2778 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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changeset
|
2779 result = _worker_cset_start_region[worker_i]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2780 assert(result == NULL || result->in_collection_set(), "sanity"); |
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2781 return result; |
fd2b426c30db
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4708
diff
changeset
|
2782 } |
fd2b426c30db
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diff
changeset
|
2783 |
fd2b426c30db
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diff
changeset
|
2784 // The cached entry was not valid so let's calculate |
fd2b426c30db
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diff
changeset
|
2785 // a suitable starting heap region for this worker. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2786 |
fd2b426c30db
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diff
changeset
|
2787 // We want the parallel threads to start their collection |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2788 // set iteration at different collection set regions to |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2789 // avoid contention. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2790 // If we have: |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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diff
changeset
|
2791 // n collection set regions |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2792 // p threads |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2793 // Then thread t will start at region floor ((t * n) / p) |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2794 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
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diff
changeset
|
2795 result = g1_policy()->collection_set(); |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2796 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6010
720b6a76dd9d
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|
2797 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
|
2798 uint active_workers = workers()->active_workers(); |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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4708
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changeset
|
2799 assert(UseDynamicNumberOfGCThreads || |
fd2b426c30db
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diff
changeset
|
2800 active_workers == workers()->total_workers(), |
fd2b426c30db
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diff
changeset
|
2801 "Unless dynamic should use total workers"); |
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|
2802 |
6010
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|
2803 uint end_ind = (cs_size * worker_i) / active_workers; |
720b6a76dd9d
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|
2804 uint start_ind = 0; |
4709
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2805 |
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diff
changeset
|
2806 if (worker_i > 0 && |
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2807 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
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diff
changeset
|
2808 // Previous workers starting region is valid |
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diff
changeset
|
2809 // so let's iterate from there |
fd2b426c30db
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changeset
|
2810 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
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changeset
|
2811 result = _worker_cset_start_region[worker_i - 1]; |
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diff
changeset
|
2812 } |
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|
2813 |
6010
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|
2814 for (uint i = start_ind; i < end_ind; i++) { |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2815 result = result->next_in_collection_set(); |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2816 } |
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4095
diff
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|
2817 } |
4709
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changeset
|
2818 |
fd2b426c30db
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diff
changeset
|
2819 // Note: the calculated starting heap region may be NULL |
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diff
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|
2820 // (when the collection set is empty). |
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changeset
|
2821 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
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changeset
|
2822 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
fd2b426c30db
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|
2823 "should be updated only once per pause"); |
fd2b426c30db
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changeset
|
2824 _worker_cset_start_region[worker_i] = result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2825 OrderAccess::storestore(); |
fd2b426c30db
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parents:
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diff
changeset
|
2826 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
2827 return result; |
dc467e8b2c5e
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4095
diff
changeset
|
2828 } |
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|
2829 |
342 | 2830 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2831 HeapRegion* r = g1_policy()->collection_set(); | |
2832 while (r != NULL) { | |
2833 HeapRegion* next = r->next_in_collection_set(); | |
2834 if (cl->doHeapRegion(r)) { | |
2835 cl->incomplete(); | |
2836 return; | |
2837 } | |
2838 r = next; | |
2839 } | |
2840 } | |
2841 | |
2842 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2843 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2844 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2845 // The CSet is empty so there's nothing to do. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2846 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2847 } |
4e5661ba9d98
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diff
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|
2848 |
342 | 2849 assert(r->in_collection_set(), |
2850 "Start region must be a member of the collection set."); | |
2851 HeapRegion* cur = r; | |
2852 while (cur != NULL) { | |
2853 HeapRegion* next = cur->next_in_collection_set(); | |
2854 if (cl->doHeapRegion(cur) && false) { | |
2855 cl->incomplete(); | |
2856 return; | |
2857 } | |
2858 cur = next; | |
2859 } | |
2860 cur = g1_policy()->collection_set(); | |
2861 while (cur != r) { | |
2862 HeapRegion* next = cur->next_in_collection_set(); | |
2863 if (cl->doHeapRegion(cur) && false) { | |
2864 cl->incomplete(); | |
2865 return; | |
2866 } | |
2867 cur = next; | |
2868 } | |
2869 } | |
2870 | |
2871 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2872 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2873 } |
2874 | |
2875 | |
2876 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2877 Space* res = heap_region_containing(addr); | |
2878 if (res == NULL) | |
2879 res = perm_gen()->space_containing(addr); | |
2880 return res; | |
2881 } | |
2882 | |
2883 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2884 Space* sp = space_containing(addr); | |
2885 if (sp != NULL) { | |
2886 return sp->block_start(addr); | |
2887 } | |
2888 return NULL; | |
2889 } | |
2890 | |
2891 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2892 Space* sp = space_containing(addr); | |
2893 assert(sp != NULL, "block_size of address outside of heap"); | |
2894 return sp->block_size(addr); | |
2895 } | |
2896 | |
2897 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2898 Space* sp = space_containing(addr); | |
2899 return sp->block_is_obj(addr); | |
2900 } | |
2901 | |
2902 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2903 return true; | |
2904 } | |
2905 | |
2906 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2907 return HeapRegion::GrainBytes; | |
2908 } | |
2909 | |
2910 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2911 // Return the remaining space in the cur alloc region, but not less than | |
2912 // the min TLAB size. | |
1313
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2913 |
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2914 // Also, this value can be at most the humongous object threshold, |
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2915 // since we can't allow tlabs to grow big enough to accomodate |
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2916 // humongous objects. |
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|
2917 |
2433
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|
2918 HeapRegion* hr = _mutator_alloc_region.get(); |
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2919 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
2433
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2920 if (hr == NULL) { |
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2921 return max_tlab_size; |
342 | 2922 } else { |
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2923 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2924 } |
2925 } | |
2926 | |
2927 size_t G1CollectedHeap::max_capacity() const { | |
2188
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6923430: G1: assert(res != 0,"This should have worked.")
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2928 return _g1_reserved.byte_size(); |
342 | 2929 } |
2930 | |
2931 jlong G1CollectedHeap::millis_since_last_gc() { | |
2932 // assert(false, "NYI"); | |
2933 return 0; | |
2934 } | |
2935 | |
2936 void G1CollectedHeap::prepare_for_verify() { | |
2937 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2938 ensure_parsability(false); | |
2939 } | |
2940 g1_rem_set()->prepare_for_verify(); | |
2941 } | |
2942 | |
2943 class VerifyLivenessOopClosure: public OopClosure { | |
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2944 G1CollectedHeap* _g1h; |
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2945 VerifyOption _vo; |
342 | 2946 public: |
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2947 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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2948 _g1h(g1h), _vo(vo) |
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2949 { } |
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2950 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2951 void do_oop( oop *p) { do_oop_work(p); } |
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2952 |
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2953 template <class T> void do_oop_work(T *p) { |
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2954 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
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2955 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
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2956 "Dead object referenced by a not dead object"); |
342 | 2957 } |
2958 }; | |
2959 | |
2960 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2961 private: |
342 | 2962 G1CollectedHeap* _g1h; |
2963 size_t _live_bytes; | |
2964 HeapRegion *_hr; | |
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|
2965 VerifyOption _vo; |
342 | 2966 public: |
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|
2967 // _vo == UsePrevMarking -> use "prev" marking information, |
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2968 // _vo == UseNextMarking -> use "next" marking information, |
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2969 // _vo == UseMarkWord -> use mark word from object header. |
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2970 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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2971 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2972 _g1h = G1CollectedHeap::heap(); |
2973 } | |
2974 void do_object(oop o) { | |
3772
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2975 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2976 assert(o != NULL, "Huh?"); |
3772
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2977 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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2978 // If the object is alive according to the mark word, |
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|
2979 // then verify that the marking information agrees. |
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|
2980 // Note we can't verify the contra-positive of the |
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2981 // above: if the object is dead (according to the mark |
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2982 // word), it may not be marked, or may have been marked |
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2983 // but has since became dead, or may have been allocated |
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|
2984 // since the last marking. |
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|
2985 if (_vo == VerifyOption_G1UseMarkWord) { |
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|
2986 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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|
2987 } |
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|
2988 |
342 | 2989 o->oop_iterate(&isLive); |
1389
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6943926: G1: Integer overflow during heap region verification
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1388
diff
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|
2990 if (!_hr->obj_allocated_since_prev_marking(o)) { |
5dbd9300cf9c
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|
2991 size_t obj_size = o->size(); // Make sure we don't overflow |
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|
2992 _live_bytes += (obj_size * HeapWordSize); |
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|
2993 } |
342 | 2994 } |
2995 } | |
2996 size_t live_bytes() { return _live_bytes; } | |
2997 }; | |
2998 | |
2999 class PrintObjsInRegionClosure : public ObjectClosure { | |
3000 HeapRegion *_hr; | |
3001 G1CollectedHeap *_g1; | |
3002 public: | |
3003 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
3004 _g1 = G1CollectedHeap::heap(); | |
3005 }; | |
3006 | |
3007 void do_object(oop o) { | |
3008 if (o != NULL) { | |
3009 HeapWord *start = (HeapWord *) o; | |
3010 size_t word_sz = o->size(); | |
3011 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
3012 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
3013 (void*) o, word_sz, | |
3014 _g1->isMarkedPrev(o), | |
3015 _g1->isMarkedNext(o), | |
3016 _hr->obj_allocated_since_prev_marking(o)); | |
3017 HeapWord *end = start + word_sz; | |
3018 HeapWord *cur; | |
3019 int *val; | |
3020 for (cur = start; cur < end; cur++) { | |
3021 val = (int *) cur; | |
3022 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
3023 } | |
3024 } | |
3025 } | |
3026 }; | |
3027 | |
3028 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 3029 private: |
3772
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|
3030 bool _par; |
6747fd0512e0
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|
3031 VerifyOption _vo; |
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|
3032 bool _failures; |
811 | 3033 public: |
3772
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|
3034 // _vo == UsePrevMarking -> use "prev" marking information, |
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|
3035 // _vo == UseNextMarking -> use "next" marking information, |
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|
3036 // _vo == UseMarkWord -> use mark word from object header. |
6008 | 3037 VerifyRegionClosure(bool par, VerifyOption vo) |
3038 : _par(par), | |
3772
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|
3039 _vo(vo), |
1020
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|
3040 _failures(false) {} |
ff2402f6a50b
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|
3041 |
ff2402f6a50b
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|
3042 bool failures() { |
ff2402f6a50b
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|
3043 return _failures; |
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|
3044 } |
845
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|
3045 |
342 | 3046 bool doHeapRegion(HeapRegion* r) { |
390 | 3047 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
3048 "Should be unclaimed at verify points."); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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636
diff
changeset
|
3049 if (!r->continuesHumongous()) { |
1020
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|
3050 bool failures = false; |
6008 | 3051 r->verify(_vo, &failures); |
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|
3052 if (failures) { |
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|
3053 _failures = true; |
ff2402f6a50b
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|
3054 } else { |
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|
3055 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
1020
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|
3056 r->object_iterate(¬_dead_yet_cl); |
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|
3057 if (_vo != VerifyOption_G1UseNextMarking) { |
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|
3058 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
3059 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
3060 "max_live_bytes "SIZE_FORMAT" " |
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diff
changeset
|
3061 "< calculated "SIZE_FORMAT, |
2ace1c4ee8da
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changeset
|
3062 r->bottom(), r->end(), |
2ace1c4ee8da
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|
3063 r->max_live_bytes(), |
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|
3064 not_dead_yet_cl.live_bytes()); |
4787
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|
3065 _failures = true; |
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|
3066 } |
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|
3067 } else { |
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|
3068 // When vo == UseNextMarking we cannot currently do a sanity |
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|
3069 // check on the live bytes as the calculation has not been |
2ace1c4ee8da
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diff
changeset
|
3070 // finalized yet. |
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|
3071 } |
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|
3072 } |
342 | 3073 } |
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|
3074 return false; // stop the region iteration if we hit a failure |
342 | 3075 } |
3076 }; | |
3077 | |
3078 class VerifyRootsClosure: public OopsInGenClosure { | |
3079 private: | |
3080 G1CollectedHeap* _g1h; | |
3772
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|
3081 VerifyOption _vo; |
342 | 3082 bool _failures; |
3083 public: | |
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|
3084 // _vo == UsePrevMarking -> use "prev" marking information, |
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changeset
|
3085 // _vo == UseNextMarking -> use "next" marking information, |
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changeset
|
3086 // _vo == UseMarkWord -> use mark word from object header. |
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|
3087 VerifyRootsClosure(VerifyOption vo) : |
845
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|
3088 _g1h(G1CollectedHeap::heap()), |
3772
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changeset
|
3089 _vo(vo), |
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|
3090 _failures(false) { } |
342 | 3091 |
3092 bool failures() { return _failures; } | |
3093 | |
845
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|
3094 template <class T> void do_oop_nv(T* p) { |
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3095 T heap_oop = oopDesc::load_heap_oop(p); |
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3096 if (!oopDesc::is_null(heap_oop)) { |
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3097 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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3098 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 3099 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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3100 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
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3101 if (_vo == VerifyOption_G1UseMarkWord) { |
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3102 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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3103 } |
342 | 3104 obj->print_on(gclog_or_tty); |
3105 _failures = true; | |
3106 } | |
3107 } | |
3108 } | |
845
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3109 |
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3110 void do_oop(oop* p) { do_oop_nv(p); } |
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3111 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 3112 }; |
3113 | |
390 | 3114 // This is the task used for parallel heap verification. |
3115 | |
3116 class G1ParVerifyTask: public AbstractGangTask { | |
3117 private: | |
3118 G1CollectedHeap* _g1h; | |
3772
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3119 VerifyOption _vo; |
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3120 bool _failures; |
390 | 3121 |
3122 public: | |
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3123 // _vo == UsePrevMarking -> use "prev" marking information, |
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3124 // _vo == UseNextMarking -> use "next" marking information, |
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3125 // _vo == UseMarkWord -> use mark word from object header. |
6008 | 3126 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) : |
390 | 3127 AbstractGangTask("Parallel verify task"), |
845
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3128 _g1h(g1h), |
3772
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3129 _vo(vo), |
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3130 _failures(false) { } |
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3131 |
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3132 bool failures() { |
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3133 return _failures; |
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3134 } |
390 | 3135 |
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3136 void work(uint worker_id) { |
637
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3137 HandleMark hm; |
6008 | 3138 VerifyRegionClosure blk(true, _vo); |
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3139 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
4095
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3140 _g1h->workers()->active_workers(), |
390 | 3141 HeapRegion::ParVerifyClaimValue); |
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3142 if (blk.failures()) { |
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3143 _failures = true; |
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3144 } |
390 | 3145 } |
3146 }; | |
3147 | |
6008 | 3148 void G1CollectedHeap::verify(bool silent) { |
3149 verify(silent, VerifyOption_G1UsePrevMarking); | |
3150 } | |
3151 | |
3152 void G1CollectedHeap::verify(bool silent, | |
3772
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3153 VerifyOption vo) { |
342 | 3154 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
3293
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3155 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
3772
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3156 VerifyRootsClosure rootsCl(vo); |
4095
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3157 |
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3158 assert(Thread::current()->is_VM_thread(), |
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3159 "Expected to be executed serially by the VM thread at this point"); |
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3160 |
989
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3161 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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3162 |
3293
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|
3163 // We apply the relevant closures to all the oops in the |
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3164 // system dictionary, the string table and the code cache. |
4910
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3165 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
3772
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|
3166 |
3293
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|
3167 process_strong_roots(true, // activate StrongRootsScope |
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|
3168 true, // we set "collecting perm gen" to true, |
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3169 // so we don't reset the dirty cards in the perm gen. |
4910
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3170 ScanningOption(so), // roots scanning options |
342 | 3171 &rootsCl, |
989
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3172 &blobsCl, |
342 | 3173 &rootsCl); |
3772
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|
3174 |
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|
3175 // If we're verifying after the marking phase of a Full GC then we can't |
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|
3176 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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|
3177 // the perm gen may be dead and hence not marked. If one of these dead |
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|
3178 // objects is considered to be a root then we may end up with a false |
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|
3179 // "Root location <x> points to dead ob <y>" failure. |
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|
3180 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3181 // Since we used "collecting_perm_gen" == true above, we will not have |
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|
3182 // checked the refs from perm into the G1-collected heap. We check those |
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|
3183 // references explicitly below. Whether the relevant cards are dirty |
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|
3184 // is checked further below in the rem set verification. |
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|
3185 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
3186 perm_gen()->oop_iterate(&rootsCl); |
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|
3187 } |
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|
3188 bool failures = rootsCl.failures(); |
3772
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|
3189 |
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|
3190 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3191 // If we're verifying during a full GC then the region sets |
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|
3192 // will have been torn down at the start of the GC. Therefore |
6747fd0512e0
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diff
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|
3193 // verifying the region sets will fail. So we only verify |
6747fd0512e0
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diff
changeset
|
3194 // the region sets when not in a full GC. |
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|
3195 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
6747fd0512e0
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|
3196 verify_region_sets(); |
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|
3197 } |
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|
3198 |
2152 | 3199 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3200 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3201 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3202 "sanity check"); | |
3203 | |
6008 | 3204 G1ParVerifyTask task(this, vo); |
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|
3205 assert(UseDynamicNumberOfGCThreads || |
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|
3206 workers()->active_workers() == workers()->total_workers(), |
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|
3207 "If not dynamic should be using all the workers"); |
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|
3208 int n_workers = workers()->active_workers(); |
390 | 3209 set_par_threads(n_workers); |
3210 workers()->run_task(&task); | |
3211 set_par_threads(0); | |
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|
3212 if (task.failures()) { |
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|
3213 failures = true; |
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|
3214 } |
390 | 3215 |
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|
3216 // Checks that the expected amount of parallel work was done. |
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|
3217 // The implication is that n_workers is > 0. |
390 | 3218 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3219 "sanity check"); | |
3220 | |
3221 reset_heap_region_claim_values(); | |
3222 | |
3223 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3224 "sanity check"); | |
3225 } else { | |
6008 | 3226 VerifyRegionClosure blk(false, vo); |
3766 | 3227 heap_region_iterate(&blk); |
1020
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|
3228 if (blk.failures()) { |
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|
3229 failures = true; |
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|
3230 } |
390 | 3231 } |
2152 | 3232 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3233 rem_set()->verify(); |
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|
3234 |
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|
3235 if (failures) { |
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|
3236 gclog_or_tty->print_cr("Heap:"); |
4073
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|
3237 // It helps to have the per-region information in the output to |
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|
3238 // help us track down what went wrong. This is why we call |
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|
3239 // print_extended_on() instead of print_on(). |
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|
3240 print_extended_on(gclog_or_tty); |
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|
3241 gclog_or_tty->print_cr(""); |
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diff
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|
3242 #ifndef PRODUCT |
1044 | 3243 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3244 concurrent_mark()->print_reachable("at-verification-failure", |
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|
3245 vo, false /* all */); |
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|
3246 } |
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diff
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|
3247 #endif |
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|
3248 gclog_or_tty->flush(); |
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|
3249 } |
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|
3250 guarantee(!failures, "there should not have been any failures"); |
342 | 3251 } else { |
3252 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3253 } | |
3254 } | |
3255 | |
3256 class PrintRegionClosure: public HeapRegionClosure { | |
3257 outputStream* _st; | |
3258 public: | |
3259 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3260 bool doHeapRegion(HeapRegion* r) { | |
3261 r->print_on(_st); | |
3262 return false; | |
3263 } | |
3264 }; | |
3265 | |
3266 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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|
3267 st->print(" %-20s", "garbage-first heap"); |
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|
3268 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")
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diff
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|
3269 capacity()/K, used_unlocked()/K); |
838
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|
3270 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
0316eac49d5a
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|
3271 _g1_storage.low_boundary(), |
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3272 _g1_storage.high(), |
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3273 _g1_storage.high_boundary()); |
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3274 st->cr(); |
3986
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|
3275 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
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3276 uint young_regions = _young_list->length(); |
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3277 st->print("%u young (" SIZE_FORMAT "K), ", young_regions, |
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3278 (size_t) young_regions * HeapRegion::GrainBytes / K); |
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3279 uint survivor_regions = g1_policy()->recorded_survivor_regions(); |
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3280 st->print("%u survivors (" SIZE_FORMAT "K)", survivor_regions, |
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3281 (size_t) survivor_regions * HeapRegion::GrainBytes / K); |
838
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3282 st->cr(); |
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3283 perm()->as_gen()->print_on(st); |
4073
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3284 } |
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3285 |
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3286 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
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3287 print_on(st); |
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|
3288 |
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3289 // Print the per-region information. |
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3290 st->cr(); |
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3291 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), " |
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3292 "HS=humongous(starts), HC=humongous(continues), " |
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3293 "CS=collection set, F=free, TS=gc time stamp, " |
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3294 "PTAMS=previous top-at-mark-start, " |
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3295 "NTAMS=next top-at-mark-start)"); |
342 | 3296 PrintRegionClosure blk(st); |
3766 | 3297 heap_region_iterate(&blk); |
342 | 3298 } |
3299 | |
3300 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
1833
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3301 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3302 workers()->print_worker_threads_on(st); |
3303 } | |
3304 _cmThread->print_on(st); | |
342 | 3305 st->cr(); |
1019 | 3306 _cm->print_worker_threads_on(st); |
3307 _cg1r->print_worker_threads_on(st); | |
342 | 3308 st->cr(); |
3309 } | |
3310 | |
3311 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1833
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3312 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3313 workers()->threads_do(tc); |
3314 } | |
3315 tc->do_thread(_cmThread); | |
794 | 3316 _cg1r->threads_do(tc); |
342 | 3317 } |
3318 | |
3319 void G1CollectedHeap::print_tracing_info() const { | |
3320 // We'll overload this to mean "trace GC pause statistics." | |
3321 if (TraceGen0Time || TraceGen1Time) { | |
3322 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3323 // to that. | |
3324 g1_policy()->print_tracing_info(); | |
3325 } | |
751 | 3326 if (G1SummarizeRSetStats) { |
342 | 3327 g1_rem_set()->print_summary_info(); |
3328 } | |
1282 | 3329 if (G1SummarizeConcMark) { |
342 | 3330 concurrent_mark()->print_summary_info(); |
3331 } | |
3332 g1_policy()->print_yg_surv_rate_info(); | |
3333 SpecializationStats::print(); | |
3334 } | |
3335 | |
3777
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3336 #ifndef PRODUCT |
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3337 // Helpful for debugging RSet issues. |
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3338 |
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3339 class PrintRSetsClosure : public HeapRegionClosure { |
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3340 private: |
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3341 const char* _msg; |
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3342 size_t _occupied_sum; |
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3343 |
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3344 public: |
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3345 bool doHeapRegion(HeapRegion* r) { |
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3346 HeapRegionRemSet* hrrs = r->rem_set(); |
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3347 size_t occupied = hrrs->occupied(); |
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3348 _occupied_sum += occupied; |
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3349 |
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3350 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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3351 HR_FORMAT_PARAMS(r)); |
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3352 if (occupied == 0) { |
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3353 gclog_or_tty->print_cr(" RSet is empty"); |
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3354 } else { |
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3355 hrrs->print(); |
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3356 } |
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3357 gclog_or_tty->print_cr("----------"); |
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3358 return false; |
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|
3359 } |
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3360 |
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3361 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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3362 gclog_or_tty->cr(); |
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3363 gclog_or_tty->print_cr("========================================"); |
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3364 gclog_or_tty->print_cr(msg); |
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3365 gclog_or_tty->cr(); |
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|
3366 } |
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3367 |
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3368 ~PrintRSetsClosure() { |
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3369 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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3370 gclog_or_tty->print_cr("========================================"); |
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|
3371 gclog_or_tty->cr(); |
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|
3372 } |
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|
3373 }; |
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|
3374 |
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3375 void G1CollectedHeap::print_cset_rsets() { |
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|
3376 PrintRSetsClosure cl("Printing CSet RSets"); |
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|
3377 collection_set_iterate(&cl); |
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|
3378 } |
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|
3379 |
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3380 void G1CollectedHeap::print_all_rsets() { |
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|
3381 PrintRSetsClosure cl("Printing All RSets");; |
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|
3382 heap_region_iterate(&cl); |
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|
3383 } |
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|
3384 #endif // PRODUCT |
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|
3385 |
342 | 3386 G1CollectedHeap* G1CollectedHeap::heap() { |
3387 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3388 "not a garbage-first heap"); | |
3389 return _g1h; | |
3390 } | |
3391 | |
3392 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
1245
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3393 // always_do_update_barrier = false; |
342 | 3394 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3395 // Call allocation profiler | |
3396 AllocationProfiler::iterate_since_last_gc(); | |
3397 // Fill TLAB's and such | |
3398 ensure_parsability(true); | |
3399 } | |
3400 | |
3401 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3402 // FIXME: what is this about? | |
3403 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3404 // is set. | |
3405 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3406 "derived pointer present")); | |
1245
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3407 // always_do_update_barrier = true; |
3979
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6484982: G1: process references during evacuation pauses
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|
3408 |
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|
3409 // We have just completed a GC. Update the soft reference |
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|
3410 // policy with the new heap occupancy |
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|
3411 Universe::update_heap_info_at_gc(); |
342 | 3412 } |
3413 | |
1973 | 3414 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3415 unsigned int gc_count_before, | |
3416 bool* succeeded) { | |
3417 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3418 g1_policy()->record_stop_world_start(); |
1973 | 3419 VM_G1IncCollectionPause op(gc_count_before, |
3420 word_size, | |
3421 false, /* should_initiate_conc_mark */ | |
3422 g1_policy()->max_pause_time_ms(), | |
3423 GCCause::_g1_inc_collection_pause); | |
3424 VMThread::execute(&op); | |
3425 | |
3426 HeapWord* result = op.result(); | |
3427 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3428 assert(result == NULL || ret_succeeded, | |
3429 "the result should be NULL if the VM did not succeed"); | |
3430 *succeeded = ret_succeeded; | |
3431 | |
3432 assert_heap_not_locked(); | |
3433 return result; | |
342 | 3434 } |
3435 | |
3436 void | |
3437 G1CollectedHeap::doConcurrentMark() { | |
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3438 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3439 if (!_cmThread->in_progress()) { |
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3440 _cmThread->set_started(); |
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|
3441 CGC_lock->notify(); |
342 | 3442 } |
3443 } | |
3444 | |
3445 size_t G1CollectedHeap::pending_card_num() { | |
3446 size_t extra_cards = 0; | |
3447 JavaThread *curr = Threads::first(); | |
3448 while (curr != NULL) { | |
3449 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3450 extra_cards += dcq.size(); | |
3451 curr = curr->next(); | |
3452 } | |
3453 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3454 size_t buffer_size = dcqs.buffer_size(); | |
3455 size_t buffer_num = dcqs.completed_buffers_num(); | |
3456 return buffer_size * buffer_num + extra_cards; | |
3457 } | |
3458 | |
3459 size_t G1CollectedHeap::max_pending_card_num() { | |
3460 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3461 size_t buffer_size = dcqs.buffer_size(); | |
3462 size_t buffer_num = dcqs.completed_buffers_num(); | |
3463 int thread_num = Threads::number_of_threads(); | |
3464 return (buffer_num + thread_num) * buffer_size; | |
3465 } | |
3466 | |
3467 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3468 return g1_rem_set()->cardsScanned(); |
342 | 3469 } |
3470 | |
3471 void | |
3472 G1CollectedHeap::setup_surviving_young_words() { | |
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3473 assert(_surviving_young_words == NULL, "pre-condition"); |
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3474 uint array_length = g1_policy()->young_cset_region_length(); |
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3475 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, (size_t) array_length); |
342 | 3476 if (_surviving_young_words == NULL) { |
3477 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3478 "Not enough space for young surv words summary."); | |
3479 } | |
6010
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3480 memset(_surviving_young_words, 0, (size_t) array_length * sizeof(size_t)); |
845
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3481 #ifdef ASSERT |
6010
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3482 for (uint i = 0; i < array_length; ++i) { |
845
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3483 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3484 } |
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|
3485 #endif // !ASSERT |
342 | 3486 } |
3487 | |
3488 void | |
3489 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3490 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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|
3491 uint array_length = g1_policy()->young_cset_region_length(); |
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7157073: G1: type change size_t -> uint for region counts / indexes
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|
3492 for (uint i = 0; i < array_length; ++i) { |
342 | 3493 _surviving_young_words[i] += surv_young_words[i]; |
6010
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|
3494 } |
342 | 3495 } |
3496 | |
3497 void | |
3498 G1CollectedHeap::cleanup_surviving_young_words() { | |
3499 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3500 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3501 _surviving_young_words = NULL; | |
3502 } | |
3503 | |
3777
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|
3504 #ifdef ASSERT |
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|
3505 class VerifyCSetClosure: public HeapRegionClosure { |
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7046182: G1: remove unnecessary iterations over the collection set
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|
3506 public: |
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|
3507 bool doHeapRegion(HeapRegion* hr) { |
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7046182: G1: remove unnecessary iterations over the collection set
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|
3508 // Here we check that the CSet region's RSet is ready for parallel |
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diff
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|
3509 // iteration. The fields that we'll verify are only manipulated |
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diff
changeset
|
3510 // when the region is part of a CSet and is collected. Afterwards, |
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|
3511 // we reset these fields when we clear the region's RSet (when the |
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diff
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|
3512 // region is freed) so they are ready when the region is |
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|
3513 // re-allocated. The only exception to this is if there's an |
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7046182: G1: remove unnecessary iterations over the collection set
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diff
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|
3514 // evacuation failure and instead of freeing the region we leave |
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|
3515 // it in the heap. In that case, we reset these fields during |
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diff
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|
3516 // evacuation failure handling. |
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|
3517 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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|
3518 |
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diff
changeset
|
3519 // Here's a good place to add any other checks we'd like to |
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diff
changeset
|
3520 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
changeset
|
3521 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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1245
diff
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|
3522 } |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
3523 }; |
3777
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|
3524 #endif // ASSERT |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
3525 |
1709 | 3526 #if TASKQUEUE_STATS |
3527 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3528 st->print_raw_cr("GC Task Stats"); | |
3529 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3530 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3531 } | |
3532 | |
3533 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3534 print_taskqueue_stats_hdr(st); | |
3535 | |
3536 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3537 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3538 for (int i = 0; i < n; ++i) { |
3539 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3540 totals += task_queue(i)->stats; | |
3541 } | |
3542 st->print_raw("tot "); totals.print(st); st->cr(); | |
3543 | |
3544 DEBUG_ONLY(totals.verify()); | |
3545 } | |
3546 | |
3547 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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diff
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|
3548 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3549 for (int i = 0; i < n; ++i) { |
3550 task_queue(i)->stats.reset(); | |
3551 } | |
3552 } | |
3553 #endif // TASKQUEUE_STATS | |
3554 | |
1973 | 3555 bool |
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
3556 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3557 assert_at_safepoint(true /* should_be_vm_thread */); |
3558 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3559 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
3560 if (GC_locker::check_active_before_gc()) { |
1973 | 3561 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3562 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
3563 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3564 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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parents:
2038
diff
changeset
|
3565 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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2038
diff
changeset
|
3566 |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
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|
3567 print_heap_before_gc(); |
838
0316eac49d5a
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|
3568 |
4072 | 3569 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3570 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
3571 verify_dirty_young_regions(); |
2152 | 3572 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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|
3573 // This call will decide whether this pause is an initial-mark |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
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diff
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|
3574 // pause. If it is, during_initial_mark_pause() will return true |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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diff
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|
3575 // for the duration of this pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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diff
changeset
|
3576 g1_policy()->decide_on_conc_mark_initiation(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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|
3577 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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diff
changeset
|
3578 // 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
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parents:
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diff
changeset
|
3579 assert(!g1_policy()->during_initial_mark_pause() || |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3580 g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
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|
3581 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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4829
diff
changeset
|
3582 // We also do not allow mixed GCs during marking. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3583 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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diff
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|
3584 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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4829
diff
changeset
|
3585 // Record whether this pause is an initial mark. When the current |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3586 // thread has completed its logging output and it's safe to signal |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3587 // 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
|
3588 bool should_start_conc_mark = g1_policy()->during_initial_mark_pause(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
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|
3589 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3590 // Inner scope for scope based logging, timers, and stats collection |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
3591 { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3592 if (g1_policy()->during_initial_mark_pause()) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
3593 // 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
|
3594 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3595 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
3596 } |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3597 // if the log level is "finer" is on, we'll print long statistics information |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3598 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3599 // is messy if we do. |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3600 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3601 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
6030 | 3602 |
3603 char verbose_str[128]; | |
3604 sprintf(verbose_str, "GC pause (%s) (%s)%s", | |
3605 GCCause::to_string(gc_cause()), | |
3606 g1_policy()->gcs_are_young() ? "young" : "mixed", | |
3607 g1_policy()->during_initial_mark_pause() ? " (initial-mark)" : ""); | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
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5987
diff
changeset
|
3608 TraceTime t(verbose_str, G1Log::fine() && !G1Log::finer(), true, gclog_or_tty); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3609 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3610 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3611 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3612 |
2361 | 3613 // If the secondary_free_list is not empty, append it to the |
3614 // free_list. No need to wait for the cleanup operation to finish; | |
3615 // the region allocation code will check the secondary_free_list | |
3616 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3617 // set, skip this step so that the region allocation code has to | |
3618 // get entries from the secondary_free_list. | |
2152 | 3619 if (!G1StressConcRegionFreeing) { |
2361 | 3620 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3621 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3622 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3623 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3624 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3625 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3626 // 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
|
3627 // 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
|
3628 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
3629 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3630 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3631 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3632 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3633 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3634 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
|
3635 increment_gc_time_stamp(); |
342 | 3636 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3637 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3638 HandleMark hm; // Discard invalid handles created during verification |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3639 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3640 prepare_for_verify(); |
6008 | 3641 Universe::verify(/* silent */ false, |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3642 /* option */ VerifyOption_G1UsePrevMarking); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3643 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
3644 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3645 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3646 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
3654 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
3656 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 // 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
|
3663 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3671 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3672 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3673 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3674 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3675 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3676 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3677 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 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
|
3680 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3681 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3684 |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3685 double scan_wait_start = os::elapsedTime(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3686 // 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
|
3687 // 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
|
3688 // 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
|
3689 // moving them during the GC. |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3690 bool waited = _cm->root_regions()->wait_until_scan_finished(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3691 if (waited) { |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3692 double scan_wait_end = os::elapsedTime(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3693 double wait_time_ms = (scan_wait_end - scan_wait_start) * 1000.0; |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3694 g1_policy()->record_root_region_scan_wait_time(wait_time_ms); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3695 } |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3696 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3697 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3700 #endif // YOUNG_LIST_VERBOSE |
342 | 3701 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3705 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3706 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3707 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 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
|
3711 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3712 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3713 g1_policy()->finalize_cset(target_pause_time_ms); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3715 _cm->note_start_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3716 // 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
|
3717 // 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
|
3718 // 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
|
3719 // ensure that the CSet has been finalized. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3720 _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
|
3721 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3722 false /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3723 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3724 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3725 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3726 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3732 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3738 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3739 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3741 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3744 #endif // ASSERT |
1707 | 3745 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3746 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3747 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3748 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3749 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3754 // 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
|
3755 // (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
|
3756 // 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
|
3757 // 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
|
3758 // we checked. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3759 _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
|
3760 false /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3761 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3762 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3763 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3770 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3771 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3775 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3776 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3783 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3784 "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
|
3785 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3786 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3788 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3789 #endif // YOUNG_LIST_VERBOSE |
342 | 3790 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3793 _young_list->last_survivor_region()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3794 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3795 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3796 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3797 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3799 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3800 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3804 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3805 if (g1_policy()->during_initial_mark_pause()) { |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3806 // 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
|
3807 // 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
|
3808 // appropriate initialization is done on the CM object. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3810 set_marking_started(); |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3811 // 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
|
3812 // 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
|
3813 // the current thread has completed its logging output. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3816 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3817 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3818 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3820 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3821 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
|
3822 #endif // YOUNG_LIST_VERBOSE |
342 | 3823 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3824 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3825 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3826 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3828 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 size_t bytes_before = capacity(); |
4785 | 3830 // No need for an ergo verbose message here, |
3831 // expansion_amount() does this when it returns a value > 0. | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3837 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3838 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3839 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3841 // We redo the verificaiton but now wrt to the new CSet which |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3842 // 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
|
3843 _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
|
3844 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3845 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3846 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3847 _cm->note_end_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3848 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3849 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3850 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3851 g1_policy()->record_pause_time_ms(pause_time_ms); |
4711 | 3852 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
3853 workers()->active_workers() : 1); | |
3854 g1_policy()->record_collection_pause_end(active_workers); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3855 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3856 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3857 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3858 // 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
|
3859 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3860 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3861 // 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
|
3862 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3863 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3864 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3865 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3866 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3867 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3868 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3869 // 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
|
3870 // 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
|
3871 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3872 // 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
|
3873 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3874 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3875 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3876 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3877 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3878 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3879 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3880 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3881 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3882 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3883 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3884 prepare_for_verify(); |
6008 | 3885 Universe::verify(/* silent */ false, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3886 /* option */ VerifyOption_G1UsePrevMarking); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3887 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3888 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3889 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3890 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3891 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3892 // 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
|
3893 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3894 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3895 // 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
|
3896 // 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
|
3897 // 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
|
3898 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3899 _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
|
3900 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3901 // We have to do this after we decide whether to expand the heap or not. |
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3902 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3903 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3904 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3905 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3906 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3907 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3908 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3909 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3910 #endif |
342 | 3911 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3912 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3913 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3914 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3915 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3916 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3917 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3918 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3919 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3920 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3921 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3922 // The closing of the inner scope, immediately above, will complete |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3923 // logging at the "fine" level. The record_collection_pause_end() call |
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3924 // above will complete logging at the "finer" level. |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3925 // |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3926 // It is not yet to safe, however, to tell the concurrent mark to |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3927 // start as we have some optional output below. We don't want the |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3928 // output from the concurrent mark thread interfering with this |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3929 // logging output either. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3930 |
3766 | 3931 _hrs.verify_optional(); |
2152 | 3932 verify_region_sets_optional(); |
3933 | |
1709 | 3934 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3935 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3936 | |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3937 print_heap_after_gc(); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3938 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3939 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3940 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3941 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3942 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3943 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3944 } |
1973 | 3945 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3946 // 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
|
3947 // 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
|
3948 // that came from the pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3949 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3950 if (should_start_conc_mark) { |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3951 // CAUTION: after the doConcurrentMark() call below, |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3952 // the concurrent marking thread(s) could be running |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3953 // concurrently with us. Make sure that anything after |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3954 // 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
|
3955 // 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
|
3956 // 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
|
3957 // ConcurrentGCThread::safepoint_desynchronize(). |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3958 doConcurrentMark(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3959 } |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3960 |
1973 | 3961 return true; |
342 | 3962 } |
3963 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3964 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3965 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3966 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3967 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3968 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3969 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3970 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3971 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3972 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3973 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3974 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3975 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3976 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3977 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3978 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3979 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3980 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3981 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3982 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3983 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3984 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3985 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3986 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3987 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3988 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3989 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3990 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3991 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3992 void G1CollectedHeap::init_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3993 assert_at_safepoint(true /* should_be_vm_thread */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3994 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3995 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3996 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3997 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3998 _retained_old_gc_alloc_region = NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3999 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4000 // We will discard the current GC alloc region if: |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4001 // a) it's in the collection set (it can happen!), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4002 // b) it's already full (no point in using it), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4003 // c) it's empty (this means that it was emptied during |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4004 // a cleanup and it should be on the free list now), or |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4005 // d) it's humongous (this means that it was emptied |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4006 // during a cleanup and was added to the free list, but |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4007 // has been subseqently used to allocate a humongous |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4008 // object that may be less than the region size). |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4009 if (retained_region != NULL && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4010 !retained_region->in_collection_set() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4011 !(retained_region->top() == retained_region->end()) && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4012 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4013 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4014 retained_region->set_saved_mark(); |
4072 | 4015 // The retained region was added to the old region set when it was |
4016 // retired. We have to remove it now, since we don't allow regions | |
4017 // we allocate to in the region sets. We'll re-add it later, when | |
4018 // it's retired again. | |
4019 _old_set.remove(retained_region); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4020 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4021 retained_region->note_start_of_copying(during_im); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4022 _old_gc_alloc_region.set(retained_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4023 _hr_printer.reuse(retained_region); |
342 | 4024 } |
4025 } | |
4026 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4027 void G1CollectedHeap::release_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4028 _survivor_gc_alloc_region.release(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4029 // If we have an old GC alloc region to release, we'll save it in |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4030 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4031 // _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
parents:
3824
diff
changeset
|
4032 // 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
tonyp
parents:
3824
diff
changeset
|
4033 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4034 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 4035 } |
4036 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4037 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4038 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4039 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4040 _retained_old_gc_alloc_region = NULL; |
342 | 4041 } |
4042 | |
4043 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
4044 _drain_in_progress = false; | |
4045 set_evac_failure_closure(cl); | |
4046 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4047 } | |
4048 | |
4049 void G1CollectedHeap::finalize_for_evac_failure() { | |
4050 assert(_evac_failure_scan_stack != NULL && | |
4051 _evac_failure_scan_stack->length() == 0, | |
4052 "Postcondition"); | |
4053 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 4054 delete _evac_failure_scan_stack; |
342 | 4055 _evac_failure_scan_stack = NULL; |
4056 } | |
4057 | |
4058 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
|
4059 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
|
4060 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4061 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4062 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4063 if (G1CollectedHeap::use_parallel_gc_threads()) { |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4064 set_par_threads(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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changeset
|
4065 workers()->run_task(&rsfp_task); |
023652e49ac0
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changeset
|
4066 set_par_threads(0); |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
changeset
|
4067 } else { |
4783
023652e49ac0
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|
4068 rsfp_task.work(0); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4069 } |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4070 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4071 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4072 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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changeset
|
4073 // Reset the claim values in the regions in the collection set. |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4074 reset_cset_heap_region_claim_values(); |
023652e49ac0
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|
4075 |
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|
4076 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
342 | 4077 |
4078 // Now restore saved marks, if any. | |
4079 if (_objs_with_preserved_marks != NULL) { | |
4080 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4081 guarantee(_objs_with_preserved_marks->length() == | |
4082 _preserved_marks_of_objs->length(), "Both or none."); | |
4083 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4084 oop obj = _objs_with_preserved_marks->at(i); | |
4085 markOop m = _preserved_marks_of_objs->at(i); | |
4086 obj->set_mark(m); | |
4087 } | |
4783
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|
4088 |
342 | 4089 // Delete the preserved marks growable arrays (allocated on the C heap). |
4090 delete _objs_with_preserved_marks; | |
4091 delete _preserved_marks_of_objs; | |
4092 _objs_with_preserved_marks = NULL; | |
4093 _preserved_marks_of_objs = NULL; | |
4094 } | |
4095 } | |
4096 | |
4097 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4098 _evac_failure_scan_stack->push(obj); | |
4099 } | |
4100 | |
4101 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4102 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4103 | |
4104 while (_evac_failure_scan_stack->length() > 0) { | |
4105 oop obj = _evac_failure_scan_stack->pop(); | |
4106 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4107 obj->oop_iterate_backwards(_evac_failure_closure); | |
4108 } | |
4109 } | |
4110 | |
4111 oop | |
4112 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4113 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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|
4114 assert(obj_in_cs(old), |
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|
4115 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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|
4116 (HeapWord*) old)); |
342 | 4117 markOop m = old->mark(); |
4118 oop forward_ptr = old->forward_to_atomic(old); | |
4119 if (forward_ptr == NULL) { | |
4120 // Forward-to-self succeeded. | |
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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3920
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|
4121 |
342 | 4122 if (_evac_failure_closure != cl) { |
4123 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4124 assert(!_drain_in_progress, | |
4125 "Should only be true while someone holds the lock."); | |
4126 // Set the global evac-failure closure to the current thread's. | |
4127 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4128 set_evac_failure_closure(cl); | |
4129 // Now do the common part. | |
4130 handle_evacuation_failure_common(old, m); | |
4131 // Reset to NULL. | |
4132 set_evac_failure_closure(NULL); | |
4133 } else { | |
4134 // The lock is already held, and this is recursive. | |
4135 assert(_drain_in_progress, "This should only be the recursive case."); | |
4136 handle_evacuation_failure_common(old, m); | |
4137 } | |
4138 return old; | |
4139 } else { | |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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|
4140 // Forward-to-self failed. Either someone else managed to allocate |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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changeset
|
4141 // space for this object (old != forward_ptr) or they beat us in |
75af3e8de182
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|
4142 // self-forwarding it (old == forward_ptr). |
75af3e8de182
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|
4143 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
75af3e8de182
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|
4144 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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diff
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|
4145 "should not be in the CSet", |
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|
4146 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4147 return forward_ptr; |
4148 } | |
4149 } | |
4150 | |
4151 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4152 set_evacuation_failed(true); | |
4153 | |
4154 preserve_mark_if_necessary(old, m); | |
4155 | |
4156 HeapRegion* r = heap_region_containing(old); | |
4157 if (!r->evacuation_failed()) { | |
4158 r->set_evacuation_failed(true); | |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
4159 _hr_printer.evac_failure(r); |
342 | 4160 } |
4161 | |
4162 push_on_evac_failure_scan_stack(old); | |
4163 | |
4164 if (!_drain_in_progress) { | |
4165 // prevent recursion in copy_to_survivor_space() | |
4166 _drain_in_progress = true; | |
4167 drain_evac_failure_scan_stack(); | |
4168 _drain_in_progress = false; | |
4169 } | |
4170 } | |
4171 | |
4172 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
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6807801: CMS: could save/restore fewer header words during scavenge
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|
4173 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
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|
4174 // We want to call the "for_promotion_failure" version only in the |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
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2037
diff
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|
4175 // case of a promotion failure. |
74ee0db180fa
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|
4176 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4177 if (_objs_with_preserved_marks == NULL) { |
4178 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4179 _objs_with_preserved_marks = | |
4180 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4181 _preserved_marks_of_objs = | |
4182 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4183 } | |
4184 _objs_with_preserved_marks->push(obj); | |
4185 _preserved_marks_of_objs->push(m); | |
4186 } | |
4187 } | |
4188 | |
4189 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4190 size_t word_size) { | |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
4191 if (purpose == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4192 HeapWord* result = survivor_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4193 if (result != NULL) { |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4194 return result; |
342 | 4195 } else { |
3830
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tonyp
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3824
diff
changeset
|
4196 // 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
|
4197 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4198 return old_attempt_allocation(word_size); |
342 | 4199 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4200 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
4201 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
4202 HeapWord* result = old_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
4203 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4204 return result; |
342 | 4205 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4206 // 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
|
4207 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4208 return survivor_attempt_allocation(word_size); |
342 | 4209 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4210 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4211 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4212 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4213 // Trying to keep some compilers happy. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
4214 return NULL; |
342 | 4215 } |
4216 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4217 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
4218 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4219 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4220 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4221 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4222 _refs(g1h->task_queue(queue_num)), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
changeset
|
4223 _dcq(&g1h->dirty_card_queue_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4224 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4225 _g1_rem(g1h->g1_rem_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4226 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
4227 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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1390
diff
changeset
|
4228 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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1390
diff
changeset
|
4229 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
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|
4230 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4231 _strong_roots_time(0), _term_time(0), |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4232 _alloc_buffer_waste(0), _undo_waste(0) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
changeset
|
4233 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
changeset
|
4234 // we "sacrifice" entry 0 to keep track of surviving bytes for |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4235 // non-young regions (where the age is -1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4236 // 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
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diff
changeset
|
4237 // an attempt to eliminate cache contention |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
4238 uint real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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diff
changeset
|
4239 uint array_length = PADDING_ELEM_NUM + |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
4240 real_length + |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
changeset
|
4241 PADDING_ELEM_NUM; |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4242 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4243 if (_surviving_young_words_base == NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4244 vm_exit_out_of_memory(array_length * sizeof(size_t), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4245 "Not enough space for young surv histo."); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4246 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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diff
changeset
|
4247 memset(_surviving_young_words, 0, (size_t) real_length * sizeof(size_t)); |
845
df6caf649ff7
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|
4248 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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1390
diff
changeset
|
4249 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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1390
diff
changeset
|
4250 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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|
4251 |
845
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ysr
parents:
838
diff
changeset
|
4252 _start = os::elapsedTime(); |
df6caf649ff7
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|
4253 } |
342 | 4254 |
1709 | 4255 void |
4256 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4257 { | |
4258 st->print_raw_cr("GC Termination Stats"); | |
4259 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4260 " ------waste (KiB)------"); | |
4261 st->print_raw_cr("thr ms ms % ms % attempts" | |
4262 " total alloc undo"); | |
4263 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4264 " ------- ------- -------"); | |
4265 } | |
4266 | |
4267 void | |
4268 G1ParScanThreadState::print_termination_stats(int i, | |
4269 outputStream* const st) const | |
4270 { | |
4271 const double elapsed_ms = elapsed_time() * 1000.0; | |
4272 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4273 const double term_ms = term_time() * 1000.0; | |
4274 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4275 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4276 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4277 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4278 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4279 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4280 alloc_buffer_waste() * HeapWordSize / K, | |
4281 undo_waste() * HeapWordSize / K); | |
4282 } | |
4283 | |
1862
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4284 #ifdef ASSERT |
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4285 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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4286 assert(ref != NULL, "invariant"); |
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4287 assert(UseCompressedOops, "sanity"); |
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4288 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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4289 oop p = oopDesc::load_decode_heap_oop(ref); |
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4290 assert(_g1h->is_in_g1_reserved(p), |
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4291 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4292 return true; |
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|
4293 } |
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4294 |
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4295 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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4296 assert(ref != NULL, "invariant"); |
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4297 if (has_partial_array_mask(ref)) { |
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4298 // Must be in the collection set--it's already been copied. |
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4299 oop p = clear_partial_array_mask(ref); |
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4300 assert(_g1h->obj_in_cs(p), |
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4301 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4302 } else { |
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4303 oop p = oopDesc::load_decode_heap_oop(ref); |
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4304 assert(_g1h->is_in_g1_reserved(p), |
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4305 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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|
4306 } |
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|
4307 return true; |
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|
4308 } |
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|
4309 |
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4310 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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4311 if (ref.is_narrow()) { |
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4312 return verify_ref((narrowOop*) ref); |
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4313 } else { |
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4314 return verify_ref((oop*) ref); |
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4315 } |
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|
4316 } |
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4317 #endif // ASSERT |
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|
4318 |
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|
4319 void G1ParScanThreadState::trim_queue() { |
3979
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4320 assert(_evac_cl != NULL, "not set"); |
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4321 assert(_evac_failure_cl != NULL, "not set"); |
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4322 assert(_partial_scan_cl != NULL, "not set"); |
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4323 |
1862
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4324 StarTask ref; |
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4325 do { |
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4326 // Drain the overflow stack first, so other threads can steal. |
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4327 while (refs()->pop_overflow(ref)) { |
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4328 deal_with_reference(ref); |
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4329 } |
3979
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4330 |
1862
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4331 while (refs()->pop_local(ref)) { |
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4332 deal_with_reference(ref); |
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4333 } |
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4334 } while (!refs()->is_empty()); |
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4335 } |
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4336 |
4787
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4337 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
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4338 G1ParScanThreadState* par_scan_state) : |
342 | 4339 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
3886
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4340 _par_scan_state(par_scan_state), |
4836
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4341 _worker_id(par_scan_state->queue_num()), |
3886
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4342 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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4343 _mark_in_progress(_g1->mark_in_progress()) { } |
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4344 |
5987 | 4345 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4346 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object>::mark_object(oop obj) { | |
4787
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4347 #ifdef ASSERT |
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4348 HeapRegion* hr = _g1->heap_region_containing(obj); |
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4349 assert(hr != NULL, "sanity"); |
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4350 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
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4351 #endif // ASSERT |
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4352 |
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4353 // We know that the object is not moving so it's safe to read its size. |
4836
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4354 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
4787
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4355 } |
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4356 |
5987 | 4357 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4358 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
4359 ::mark_forwarded_object(oop from_obj, oop to_obj) { | |
4787
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4360 #ifdef ASSERT |
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4361 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
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4362 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
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4363 assert(from_obj != to_obj, "should not be self-forwarded"); |
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4364 |
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4365 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
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4366 assert(from_hr != NULL, "sanity"); |
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4367 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
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4368 |
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4369 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
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4370 assert(to_hr != NULL, "sanity"); |
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|
4371 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
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|
4372 #endif // ASSERT |
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|
4373 |
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|
4374 // The object might be in the process of being copied by another |
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|
4375 // worker so we cannot trust that its to-space image is |
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|
4376 // well-formed. So we have to read its size from its from-space |
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|
4377 // image which we know should not be changing. |
4836
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4378 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
4787
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|
4379 } |
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|
4380 |
5987 | 4381 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4382 oop G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
4383 ::copy_to_survivor_space(oop old) { | |
6010
720b6a76dd9d
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|
4384 size_t word_sz = old->size(); |
342 | 4385 HeapRegion* from_region = _g1->heap_region_containing_raw(old); |
4386 // +1 to make the -1 indexes valid... | |
4387 int young_index = from_region->young_index_in_cset()+1; | |
4787
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4388 assert( (from_region->is_young() && young_index > 0) || |
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|
4389 (!from_region->is_young() && young_index == 0), "invariant" ); |
342 | 4390 G1CollectorPolicy* g1p = _g1->g1_policy(); |
4391 markOop m = old->mark(); | |
545 | 4392 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4393 : m->age(); | |
4394 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4395 word_sz); |
4396 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4397 oop obj = oop(obj_ptr); | |
4398 | |
4399 if (obj_ptr == NULL) { | |
4400 // This will either forward-to-self, or detect that someone else has | |
4401 // installed a forwarding pointer. | |
4402 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4787
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|
4403 return _g1->handle_evacuation_failure_par(cl, old); |
342 | 4404 } |
4405 | |
526 | 4406 // We're going to allocate linearly, so might as well prefetch ahead. |
4407 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4408 | |
342 | 4409 oop forward_ptr = old->forward_to_atomic(obj); |
4410 if (forward_ptr == NULL) { | |
4411 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4412 if (g1p->track_object_age(alloc_purpose)) { |
4413 // We could simply do obj->incr_age(). However, this causes a | |
4414 // performance issue. obj->incr_age() will first check whether | |
4415 // the object has a displaced mark by checking its mark word; | |
4416 // getting the mark word from the new location of the object | |
4417 // stalls. So, given that we already have the mark word and we | |
4418 // are about to install it anyway, it's better to increase the | |
4419 // age on the mark word, when the object does not have a | |
4420 // displaced mark word. We're not expecting many objects to have | |
4421 // a displaced marked word, so that case is not optimized | |
4422 // further (it could be...) and we simply call obj->incr_age(). | |
4423 | |
4424 if (m->has_displaced_mark_helper()) { | |
4425 // in this case, we have to install the mark word first, | |
4426 // otherwise obj looks to be forwarded (the old mark word, | |
4427 // which contains the forward pointer, was copied) | |
4428 obj->set_mark(m); | |
4429 obj->incr_age(); | |
4430 } else { | |
4431 m = m->incr_age(); | |
545 | 4432 obj->set_mark(m); |
526 | 4433 } |
545 | 4434 _par_scan_state->age_table()->add(obj, word_sz); |
4435 } else { | |
4436 obj->set_mark(m); | |
526 | 4437 } |
4438 | |
342 | 4439 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
4440 surv_young_words[young_index] += word_sz; | |
4441 | |
4442 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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4783
diff
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|
4443 // 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
|
4444 // 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
|
4445 // length field of the from-space object. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4446 arrayOop(obj)->set_length(0); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4447 oop* old_p = set_partial_array_mask(old); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
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|
4448 _par_scan_state->push_on_queue(old_p); |
342 | 4449 } else { |
526 | 4450 // No point in using the slower heap_region_containing() method, |
4451 // given that we know obj is in the heap. | |
5987 | 4452 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
4453 obj->oop_iterate_backwards(&_scanner); | |
342 | 4454 } |
4455 } else { | |
4456 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4457 obj = forward_ptr; | |
4458 } | |
4459 return obj; | |
4460 } | |
4461 | |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
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|
4462 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
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|
4463 template <class T> |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
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|
4464 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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|
4465 ::do_oop_work(T* p) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4466 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4467 assert(barrier != G1BarrierRS || obj != NULL, |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4468 "Precondition: G1BarrierRS implies obj is non-NULL"); |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4469 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4470 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4471 |
526 | 4472 // 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
|
4473 if (_g1->in_cset_fast_test(obj)) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4474 oop forwardee; |
526 | 4475 if (obj->is_forwarded()) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4476 forwardee = obj->forwardee(); |
526 | 4477 } else { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4478 forwardee = copy_to_survivor_space(obj); |
342 | 4479 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4480 assert(forwardee != NULL, "forwardee should not be NULL"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
4481 oopDesc::encode_store_heap_oop(p, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4482 if (do_mark_object && forwardee != obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4483 // 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
|
4484 // 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
|
4485 mark_forwarded_object(obj, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4486 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4487 |
526 | 4488 // When scanning the RS, we only care about objs in CS. |
4489 if (barrier == G1BarrierRS) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4490 _par_scan_state->update_rs(_from, p, _worker_id); |
342 | 4491 } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4492 } else { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4493 // 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
|
4494 // 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
|
4495 // 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
|
4496 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
|
4497 mark_object(obj); |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4498 } |
526 | 4499 } |
4500 | |
4501 if (barrier == G1BarrierEvac && obj != NULL) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4502 _par_scan_state->update_rs(_from, p, _worker_id); |
526 | 4503 } |
4504 | |
4505 if (do_gen_barrier && obj != NULL) { | |
4506 par_do_barrier(p); | |
4507 } | |
4508 } | |
4509 | |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4510 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4511 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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|
4512 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4513 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4514 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
|
4515 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
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|
4516 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4517 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
|
4518 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
|
4519 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
|
4520 // 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
|
4521 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
|
4522 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4523 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
|
4524 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
|
4525 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
|
4526 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
|
4527 // 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
|
4528 // to-space object. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4529 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
|
4530 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
|
4531 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
|
4532 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4533 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
|
4534 int end = length; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4535 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
|
4536 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
342 | 4537 if (remainder > 2 * ParGCArrayScanChunk) { |
4538 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
|
4539 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
|
4540 // 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
|
4541 // 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
|
4542 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
|
4543 _par_scan_state->push_on_queue(from_obj_p); |
342 | 4544 } else { |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4545 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
|
4546 // 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
|
4547 // 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
|
4548 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
|
4549 } |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4550 _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
|
4551 // 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
|
4552 // 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
|
4553 // 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
|
4554 // 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
|
4555 // 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
|
4556 // 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
|
4557 // 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
|
4558 // 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
|
4559 to_obj_array->oop_iterate_range(&_scanner, start, end); |
342 | 4560 } |
4561 | |
4562 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4563 protected: | |
4564 G1CollectedHeap* _g1h; | |
4565 G1ParScanThreadState* _par_scan_state; | |
4566 RefToScanQueueSet* _queues; | |
4567 ParallelTaskTerminator* _terminator; | |
4568 | |
4569 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4570 RefToScanQueueSet* queues() { return _queues; } | |
4571 ParallelTaskTerminator* terminator() { return _terminator; } | |
4572 | |
4573 public: | |
4574 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4575 G1ParScanThreadState* par_scan_state, | |
4576 RefToScanQueueSet* queues, | |
4577 ParallelTaskTerminator* terminator) | |
4578 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4579 _queues(queues), _terminator(terminator) {} | |
4580 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4581 void do_void(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4582 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4583 private: |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4584 inline bool offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4585 }; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4586 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4587 bool G1ParEvacuateFollowersClosure::offer_termination() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4588 G1ParScanThreadState* const pss = par_scan_state(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4589 pss->start_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4590 const bool res = terminator()->offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4591 pss->end_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4592 return res; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4593 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4594 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4595 void G1ParEvacuateFollowersClosure::do_void() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4596 StarTask stolen_task; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4597 G1ParScanThreadState* const pss = par_scan_state(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4598 pss->trim_queue(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4599 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4600 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4601 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4602 assert(pss->verify_task(stolen_task), "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4603 if (stolen_task.is_narrow()) { |
1883
35e4e086d5f5
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|
4604 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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|
4605 } else { |
1883
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6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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|
4606 pss->deal_with_reference((oop*) stolen_task); |
1862
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|
4607 } |
1883
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|
4608 |
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|
4609 // We've just processed a reference and we might have made |
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|
4610 // available new entries on the queues. So we have to make sure |
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|
4611 // we drain the queues as necessary. |
342 | 4612 pss->trim_queue(); |
4613 } | |
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4614 } while (!offer_termination()); |
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|
4615 |
b14ec34b1e07
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|
4616 pss->retire_alloc_buffers(); |
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|
4617 } |
342 | 4618 |
4619 class G1ParTask : public AbstractGangTask { | |
4620 protected: | |
4621 G1CollectedHeap* _g1h; | |
4622 RefToScanQueueSet *_queues; | |
4623 ParallelTaskTerminator _terminator; | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
4624 uint _n_workers; |
342 | 4625 |
4626 Mutex _stats_lock; | |
4627 Mutex* stats_lock() { return &_stats_lock; } | |
4628 | |
4629 size_t getNCards() { | |
4630 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4631 / G1BlockOffsetSharedArray::N_bytes; | |
4632 } | |
4633 | |
4634 public: | |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4635 G1ParTask(G1CollectedHeap* g1h, |
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|
4636 RefToScanQueueSet *task_queues) |
342 | 4637 : AbstractGangTask("G1 collection"), |
4638 _g1h(g1h), | |
4639 _queues(task_queues), | |
4095
bca17e38de00
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|
4640 _terminator(0, _queues), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4641 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 4642 {} |
4643 | |
4644 RefToScanQueueSet* queues() { return _queues; } | |
4645 | |
4646 RefToScanQueue *work_queue(int i) { | |
4647 return queues()->queue(i); | |
4648 } | |
4649 | |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4650 ParallelTaskTerminator* terminator() { return &_terminator; } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4651 |
bca17e38de00
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|
4652 virtual void set_for_termination(int active_workers) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4653 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
bca17e38de00
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|
4654 // in the young space (_par_seq_tasks) in the G1 heap |
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|
4655 // for SequentialSubTasksDone. |
bca17e38de00
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|
4656 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
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|
4657 // both of which need setting by set_n_termination(). |
bca17e38de00
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|
4658 _g1h->SharedHeap::set_n_termination(active_workers); |
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|
4659 _g1h->set_n_termination(active_workers); |
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|
4660 terminator()->reset_for_reuse(active_workers); |
bca17e38de00
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|
4661 _n_workers = active_workers; |
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|
4662 } |
bca17e38de00
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|
4663 |
4728
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|
4664 void work(uint worker_id) { |
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|
4665 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 4666 |
4667 double start_time_ms = os::elapsedTime() * 1000.0; | |
4728
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|
4668 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 4669 |
5986
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|
4670 { |
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|
4671 ResourceMark rm; |
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|
4672 HandleMark hm; |
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|
4673 |
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|
4674 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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|
4675 |
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|
4676 G1ParScanThreadState pss(_g1h, worker_id); |
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|
4677 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
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|
4678 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
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|
4679 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
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|
4680 |
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|
4681 pss.set_evac_closure(&scan_evac_cl); |
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|
4682 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
4683 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
4684 |
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|
4685 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
500023bd0818
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|
4686 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
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7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4687 |
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5963
diff
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|
4688 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
changeset
|
4689 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
500023bd0818
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diff
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|
4690 |
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diff
changeset
|
4691 OopClosure* scan_root_cl = &only_scan_root_cl; |
500023bd0818
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diff
changeset
|
4692 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
500023bd0818
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diff
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|
4693 |
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diff
changeset
|
4694 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
500023bd0818
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diff
changeset
|
4695 // We also need to mark copied objects. |
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diff
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|
4696 scan_root_cl = &scan_mark_root_cl; |
500023bd0818
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5963
diff
changeset
|
4697 scan_perm_cl = &scan_mark_perm_cl; |
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5963
diff
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|
4698 } |
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5963
diff
changeset
|
4699 |
500023bd0818
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diff
changeset
|
4700 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
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|
4701 |
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diff
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|
4702 pss.start_strong_roots(); |
500023bd0818
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diff
changeset
|
4703 _g1h->g1_process_strong_roots(/* not collecting perm */ false, |
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diff
changeset
|
4704 SharedHeap::SO_AllClasses, |
500023bd0818
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diff
changeset
|
4705 scan_root_cl, |
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5963
diff
changeset
|
4706 &push_heap_rs_cl, |
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5963
diff
changeset
|
4707 scan_perm_cl, |
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5963
diff
changeset
|
4708 worker_id); |
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diff
changeset
|
4709 pss.end_strong_roots(); |
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diff
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|
4710 |
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diff
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|
4711 { |
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diff
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|
4712 double start = os::elapsedTime(); |
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diff
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|
4713 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); |
500023bd0818
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diff
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|
4714 evac.do_void(); |
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diff
changeset
|
4715 double elapsed_ms = (os::elapsedTime()-start)*1000.0; |
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diff
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|
4716 double term_ms = pss.term_time()*1000.0; |
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diff
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|
4717 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
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diff
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|
4718 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
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diff
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|
4719 } |
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diff
changeset
|
4720 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
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diff
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|
4721 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
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diff
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|
4722 |
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diff
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|
4723 // Clean up any par-expanded rem sets. |
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diff
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|
4724 HeapRegionRemSet::par_cleanup(); |
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diff
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|
4725 |
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diff
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|
4726 if (ParallelGCVerbose) { |
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diff
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|
4727 MutexLocker x(stats_lock()); |
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|
4728 pss.print_termination_stats(worker_id); |
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diff
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|
4729 } |
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diff
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|
4730 |
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|
4731 assert(pss.refs()->is_empty(), "should be empty"); |
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|
4732 |
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|
4733 // Close the inner scope so that the ResourceMark and HandleMark |
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|
4734 // destructors are executed here and are included as part of the |
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|
4735 // "GC Worker Time". |
342 | 4736 } |
4737 | |
1611 | 4738 double end_time_ms = os::elapsedTime() * 1000.0; |
4728
441e946dc1af
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4711
diff
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|
4739 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 4740 } |
4741 }; | |
4742 | |
4743 // *** Common G1 Evacuation Stuff | |
4744 | |
5986
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|
4745 // Closures that support the filtering of CodeBlobs scanned during |
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diff
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|
4746 // external root scanning. |
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|
4747 |
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|
4748 // Closure applied to reference fields in code blobs (specifically nmethods) |
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|
4749 // to determine whether an nmethod contains references that point into |
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|
4750 // the collection set. Used as a predicate when walking code roots so |
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|
4751 // that only nmethods that point into the collection set are added to the |
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|
4752 // 'marked' list. |
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|
4753 |
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|
4754 class G1FilteredCodeBlobToOopClosure : public CodeBlobToOopClosure { |
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|
4755 |
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|
4756 class G1PointsIntoCSOopClosure : public OopClosure { |
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|
4757 G1CollectedHeap* _g1; |
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|
4758 bool _points_into_cs; |
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|
4759 public: |
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diff
changeset
|
4760 G1PointsIntoCSOopClosure(G1CollectedHeap* g1) : |
500023bd0818
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|
4761 _g1(g1), _points_into_cs(false) { } |
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|
4762 |
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changeset
|
4763 bool points_into_cs() const { return _points_into_cs; } |
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|
4764 |
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diff
changeset
|
4765 template <class T> |
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diff
changeset
|
4766 void do_oop_nv(T* p) { |
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diff
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|
4767 if (!_points_into_cs) { |
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|
4768 T heap_oop = oopDesc::load_heap_oop(p); |
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changeset
|
4769 if (!oopDesc::is_null(heap_oop) && |
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|
4770 _g1->in_cset_fast_test(oopDesc::decode_heap_oop_not_null(heap_oop))) { |
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|
4771 _points_into_cs = true; |
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|
4772 } |
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changeset
|
4773 } |
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changeset
|
4774 } |
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diff
changeset
|
4775 |
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changeset
|
4776 virtual void do_oop(oop* p) { do_oop_nv(p); } |
500023bd0818
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changeset
|
4777 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
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|
4778 }; |
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changeset
|
4779 |
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changeset
|
4780 G1CollectedHeap* _g1; |
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|
4781 |
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changeset
|
4782 public: |
500023bd0818
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diff
changeset
|
4783 G1FilteredCodeBlobToOopClosure(G1CollectedHeap* g1, OopClosure* cl) : |
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changeset
|
4784 CodeBlobToOopClosure(cl, true), _g1(g1) { } |
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changeset
|
4785 |
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changeset
|
4786 virtual void do_code_blob(CodeBlob* cb) { |
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|
4787 nmethod* nm = cb->as_nmethod_or_null(); |
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diff
changeset
|
4788 if (nm != NULL && !(nm->test_oops_do_mark())) { |
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changeset
|
4789 G1PointsIntoCSOopClosure predicate_cl(_g1); |
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diff
changeset
|
4790 nm->oops_do(&predicate_cl); |
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diff
changeset
|
4791 |
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diff
changeset
|
4792 if (predicate_cl.points_into_cs()) { |
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diff
changeset
|
4793 // At least one of the reference fields or the oop relocations |
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changeset
|
4794 // in the nmethod points into the collection set. We have to |
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diff
changeset
|
4795 // 'mark' this nmethod. |
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diff
changeset
|
4796 // Note: Revisit the following if CodeBlobToOopClosure::do_code_blob() |
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diff
changeset
|
4797 // or MarkingCodeBlobClosure::do_code_blob() change. |
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diff
changeset
|
4798 if (!nm->test_set_oops_do_mark()) { |
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diff
changeset
|
4799 do_newly_marked_nmethod(nm); |
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diff
changeset
|
4800 } |
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diff
changeset
|
4801 } |
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diff
changeset
|
4802 } |
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diff
changeset
|
4803 } |
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diff
changeset
|
4804 }; |
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diff
changeset
|
4805 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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diff
changeset
|
4806 // This method is run in a GC worker. |
8b10f48633dc
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|
4807 |
342 | 4808 void |
4809 G1CollectedHeap:: | |
4810 g1_process_strong_roots(bool collecting_perm_gen, | |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
4811 ScanningOption so, |
342 | 4812 OopClosure* scan_non_heap_roots, |
4813 OopsInHeapRegionClosure* scan_rs, | |
4814 OopsInGenClosure* scan_perm, | |
4815 int worker_i) { | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4816 |
342 | 4817 // First scan the strong roots, including the perm gen. |
4818 double ext_roots_start = os::elapsedTime(); | |
4819 double closure_app_time_sec = 0.0; | |
4820 | |
4821 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4822 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4823 buf_scan_perm.set_generation(perm_gen()); | |
4824 | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
changeset
|
4825 // Walk the code cache w/o buffering, because StarTask cannot handle |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4826 // unaligned oop locations. |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4827 G1FilteredCodeBlobToOopClosure eager_scan_code_roots(this, scan_non_heap_roots); |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4828 |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4829 process_strong_roots(false, // no scoping; this is parallel code |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
changeset
|
4830 collecting_perm_gen, so, |
342 | 4831 &buf_scan_non_heap_roots, |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4832 &eager_scan_code_roots, |
342 | 4833 &buf_scan_perm); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4834 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4835 // Now the CM ref_processor roots. |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4836 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4837 // We need to treat the discovered reference lists of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4838 // concurrent mark ref processor as roots and keep entries |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4839 // (which are added by the marking threads) on them live |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4840 // until they can be processed at the end of marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4841 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4842 } |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4843 |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4844 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4845 buf_scan_non_heap_roots.done(); |
4846 buf_scan_perm.done(); | |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4847 |
342 | 4848 double ext_roots_end = os::elapsedTime(); |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4849 |
342 | 4850 g1_policy()->reset_obj_copy_time(worker_i); |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4851 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4852 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4853 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4854 |
342 | 4855 double ext_root_time_ms = |
4856 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4857 |
342 | 4858 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4859 | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4860 // During conc marking we have to filter the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4861 // to make sure we remove any oops into the CSet (which will show up |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4862 // as implicitly live). |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4863 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4864 if (mark_in_progress()) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4865 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4866 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4867 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4868 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4869 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
342 | 4870 |
4871 // Now scan the complement of the collection set. | |
4872 if (scan_rs != NULL) { | |
4873 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4874 } | |
3823
14a2fd14c0db
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3778
diff
changeset
|
4875 |
342 | 4876 _process_strong_tasks->all_tasks_completed(); |
4877 } | |
4878 | |
4879 void | |
4880 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4881 OopClosure* non_root_closure) { | |
989
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890
diff
changeset
|
4882 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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diff
changeset
|
4883 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4884 } |
4885 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
4886 // Weak Reference Processing support |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
4887 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
4888 // An always "is_alive" closure that is used to preserve referents. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
4889 // If the object is non-null then it's alive. Used in the preservation |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4890 // of referent objects that are pointed to by reference objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4891 // discovered by the CM ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4892 class G1AlwaysAliveClosure: public BoolObjectClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4893 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4894 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4895 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4896 void do_object(oop p) { assert(false, "Do not call."); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4897 bool do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4898 if (p != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4899 return true; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4900 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4901 return false; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4902 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4903 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4904 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4905 bool G1STWIsAliveClosure::do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
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|
4906 // An object is reachable if it is outside the collection set, |
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|
4907 // or is inside and copied. |
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|
4908 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
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|
4909 } |
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|
4910 |
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|
4911 // Non Copying Keep Alive closure |
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|
4912 class G1KeepAliveClosure: public OopClosure { |
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|
4913 G1CollectedHeap* _g1; |
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|
4914 public: |
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|
4915 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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|
4916 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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|
4917 void do_oop( oop* p) { |
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|
4918 oop obj = *p; |
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|
4919 |
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|
4920 if (_g1->obj_in_cs(obj)) { |
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|
4921 assert( obj->is_forwarded(), "invariant" ); |
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|
4922 *p = obj->forwardee(); |
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|
4923 } |
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|
4924 } |
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|
4925 }; |
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|
4926 |
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|
4927 // Copying Keep Alive closure - can be called from both |
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|
4928 // serial and parallel code as long as different worker |
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changeset
|
4929 // threads utilize different G1ParScanThreadState instances |
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|
4930 // and different queues. |
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|
4931 |
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|
4932 class G1CopyingKeepAliveClosure: public OopClosure { |
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|
4933 G1CollectedHeap* _g1h; |
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|
4934 OopClosure* _copy_non_heap_obj_cl; |
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|
4935 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
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|
4936 G1ParScanThreadState* _par_scan_state; |
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|
4937 |
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|
4938 public: |
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|
4939 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
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|
4940 OopClosure* non_heap_obj_cl, |
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|
4941 OopsInHeapRegionClosure* perm_obj_cl, |
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|
4942 G1ParScanThreadState* pss): |
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|
4943 _g1h(g1h), |
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|
4944 _copy_non_heap_obj_cl(non_heap_obj_cl), |
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|
4945 _copy_perm_obj_cl(perm_obj_cl), |
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|
4946 _par_scan_state(pss) |
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|
4947 {} |
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|
4948 |
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|
4949 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
4950 virtual void do_oop( oop* p) { do_oop_work(p); } |
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|
4951 |
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|
4952 template <class T> void do_oop_work(T* p) { |
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|
4953 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
4954 |
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|
4955 if (_g1h->obj_in_cs(obj)) { |
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|
4956 // If the referent object has been forwarded (either copied |
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|
4957 // to a new location or to itself in the event of an |
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|
4958 // evacuation failure) then we need to update the reference |
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|
4959 // field and, if both reference and referent are in the G1 |
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diff
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|
4960 // heap, update the RSet for the referent. |
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changeset
|
4961 // |
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diff
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|
4962 // If the referent has not been forwarded then we have to keep |
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|
4963 // it alive by policy. Therefore we have copy the referent. |
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|
4964 // |
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diff
changeset
|
4965 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
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diff
changeset
|
4966 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
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parents:
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diff
changeset
|
4967 // phase of reference processing) the object and it's followers |
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diff
changeset
|
4968 // will be copied, the reference field set to point to the |
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|
4969 // new location, and the RSet updated. Otherwise we need to |
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diff
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|
4970 // use the the non-heap or perm closures directly to copy |
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diff
changeset
|
4971 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
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parents:
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diff
changeset
|
4972 // updating the RSet. |
4dfb2df418f2
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parents:
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diff
changeset
|
4973 |
4dfb2df418f2
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parents:
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diff
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|
4974 if (_g1h->is_in_g1_reserved(p)) { |
4dfb2df418f2
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changeset
|
4975 _par_scan_state->push_on_queue(p); |
4dfb2df418f2
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parents:
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diff
changeset
|
4976 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
4977 // The reference field is not in the G1 heap. |
4dfb2df418f2
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parents:
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diff
changeset
|
4978 if (_g1h->perm_gen()->is_in(p)) { |
4dfb2df418f2
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changeset
|
4979 _copy_perm_obj_cl->do_oop(p); |
4dfb2df418f2
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parents:
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diff
changeset
|
4980 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
4981 _copy_non_heap_obj_cl->do_oop(p); |
4dfb2df418f2
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parents:
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diff
changeset
|
4982 } |
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parents:
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diff
changeset
|
4983 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4984 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4985 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4986 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
4987 |
4dfb2df418f2
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diff
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|
4988 // Serial drain queue closure. Called as the 'complete_gc' |
4dfb2df418f2
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parents:
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diff
changeset
|
4989 // closure for each discovered list in some of the |
4dfb2df418f2
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parents:
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diff
changeset
|
4990 // reference processing phases. |
4dfb2df418f2
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diff
changeset
|
4991 |
4dfb2df418f2
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diff
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|
4992 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
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diff
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|
4993 protected: |
4dfb2df418f2
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diff
changeset
|
4994 G1CollectedHeap* _g1h; |
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diff
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|
4995 G1ParScanThreadState* _par_scan_state; |
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|
4996 |
4dfb2df418f2
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diff
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|
4997 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
4dfb2df418f2
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diff
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|
4998 |
4dfb2df418f2
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diff
changeset
|
4999 public: |
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diff
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|
5000 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
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diff
changeset
|
5001 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5002 _par_scan_state(pss) |
4dfb2df418f2
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diff
changeset
|
5003 { } |
4dfb2df418f2
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diff
changeset
|
5004 |
4dfb2df418f2
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diff
changeset
|
5005 void do_void() { |
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diff
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|
5006 G1ParScanThreadState* const pss = par_scan_state(); |
4dfb2df418f2
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diff
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|
5007 pss->trim_queue(); |
4dfb2df418f2
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diff
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|
5008 } |
4dfb2df418f2
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diff
changeset
|
5009 }; |
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diff
changeset
|
5010 |
4dfb2df418f2
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diff
changeset
|
5011 // Parallel Reference Processing closures |
4dfb2df418f2
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diff
changeset
|
5012 |
4dfb2df418f2
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diff
changeset
|
5013 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
4dfb2df418f2
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diff
changeset
|
5014 // processing during G1 evacuation pauses. |
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diff
changeset
|
5015 |
4dfb2df418f2
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diff
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|
5016 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
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diff
changeset
|
5017 private: |
4dfb2df418f2
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diff
changeset
|
5018 G1CollectedHeap* _g1h; |
4dfb2df418f2
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diff
changeset
|
5019 RefToScanQueueSet* _queues; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
5020 FlexibleWorkGang* _workers; |
3979
4dfb2df418f2
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diff
changeset
|
5021 int _active_workers; |
4dfb2df418f2
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parents:
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diff
changeset
|
5022 |
4dfb2df418f2
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diff
changeset
|
5023 public: |
4dfb2df418f2
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diff
changeset
|
5024 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
bca17e38de00
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diff
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|
5025 FlexibleWorkGang* workers, |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5026 RefToScanQueueSet *task_queues, |
4dfb2df418f2
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diff
changeset
|
5027 int n_workers) : |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5028 _g1h(g1h), |
4dfb2df418f2
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diff
changeset
|
5029 _queues(task_queues), |
4dfb2df418f2
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parents:
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diff
changeset
|
5030 _workers(workers), |
4dfb2df418f2
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parents:
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diff
changeset
|
5031 _active_workers(n_workers) |
4dfb2df418f2
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parents:
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diff
changeset
|
5032 { |
4dfb2df418f2
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diff
changeset
|
5033 assert(n_workers > 0, "shouldn't call this otherwise"); |
4dfb2df418f2
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diff
changeset
|
5034 } |
4dfb2df418f2
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diff
changeset
|
5035 |
4dfb2df418f2
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diff
changeset
|
5036 // Executes the given task using concurrent marking worker threads. |
4dfb2df418f2
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parents:
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diff
changeset
|
5037 virtual void execute(ProcessTask& task); |
4dfb2df418f2
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diff
changeset
|
5038 virtual void execute(EnqueueTask& task); |
4dfb2df418f2
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|
5039 }; |
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|
5040 |
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|
5041 // Gang task for possibly parallel reference processing |
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|
5042 |
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|
5043 class G1STWRefProcTaskProxy: public AbstractGangTask { |
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|
5044 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
5045 ProcessTask& _proc_task; |
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|
5046 G1CollectedHeap* _g1h; |
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|
5047 RefToScanQueueSet *_task_queues; |
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|
5048 ParallelTaskTerminator* _terminator; |
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|
5049 |
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|
5050 public: |
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|
5051 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
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|
5052 G1CollectedHeap* g1h, |
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|
5053 RefToScanQueueSet *task_queues, |
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|
5054 ParallelTaskTerminator* terminator) : |
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|
5055 AbstractGangTask("Process reference objects in parallel"), |
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|
5056 _proc_task(proc_task), |
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|
5057 _g1h(g1h), |
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|
5058 _task_queues(task_queues), |
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|
5059 _terminator(terminator) |
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|
5060 {} |
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|
5061 |
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|
5062 virtual void work(uint worker_id) { |
3979
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|
5063 // The reference processing task executed by a single worker. |
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|
5064 ResourceMark rm; |
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|
5065 HandleMark hm; |
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|
5066 |
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|
5067 G1STWIsAliveClosure is_alive(_g1h); |
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|
5068 |
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5069 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5070 |
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|
5071 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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|
5072 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5073 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
5074 |
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|
5075 pss.set_evac_closure(&scan_evac_cl); |
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|
5076 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5077 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5078 |
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|
5079 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5080 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5081 |
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|
5082 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5083 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
5084 |
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|
5085 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5086 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5087 |
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|
5088 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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|
5089 // We also need to mark copied objects. |
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|
5090 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5091 copy_perm_cl = ©_mark_perm_cl; |
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|
5092 } |
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diff
changeset
|
5093 |
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diff
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|
5094 // Keep alive closure. |
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|
5095 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5096 |
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diff
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|
5097 // Complete GC closure |
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diff
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|
5098 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
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|
5099 |
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|
5100 // Call the reference processing task's work routine. |
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|
5101 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
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|
5102 |
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diff
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|
5103 // Note we cannot assert that the refs array is empty here as not all |
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|
5104 // of the processing tasks (specifically phase2 - pp2_work) execute |
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|
5105 // the complete_gc closure (which ordinarily would drain the queue) so |
4dfb2df418f2
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|
5106 // the queue may not be empty. |
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parents:
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diff
changeset
|
5107 } |
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parents:
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diff
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|
5108 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
5109 |
4dfb2df418f2
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diff
changeset
|
5110 // Driver routine for parallel reference processing. |
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parents:
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diff
changeset
|
5111 // Creates an instance of the ref processing gang |
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parents:
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diff
changeset
|
5112 // task and has the worker threads execute it. |
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parents:
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|
5113 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5114 assert(_workers != NULL, "Need parallel worker threads."); |
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diff
changeset
|
5115 |
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diff
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|
5116 ParallelTaskTerminator terminator(_active_workers, _queues); |
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|
5117 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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|
5118 |
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diff
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|
5119 _g1h->set_par_threads(_active_workers); |
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|
5120 _workers->run_task(&proc_task_proxy); |
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|
5121 _g1h->set_par_threads(0); |
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|
5122 } |
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parents:
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diff
changeset
|
5123 |
4dfb2df418f2
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parents:
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diff
changeset
|
5124 // Gang task for parallel reference enqueueing. |
4dfb2df418f2
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parents:
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diff
changeset
|
5125 |
4dfb2df418f2
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parents:
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diff
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|
5126 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
4dfb2df418f2
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|
5127 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
4dfb2df418f2
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diff
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|
5128 EnqueueTask& _enq_task; |
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diff
changeset
|
5129 |
4dfb2df418f2
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diff
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|
5130 public: |
4dfb2df418f2
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diff
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|
5131 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
4dfb2df418f2
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diff
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|
5132 AbstractGangTask("Enqueue reference objects in parallel"), |
4dfb2df418f2
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parents:
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diff
changeset
|
5133 _enq_task(enq_task) |
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diff
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|
5134 { } |
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diff
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|
5135 |
4728
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|
5136 virtual void work(uint worker_id) { |
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|
5137 _enq_task.work(worker_id); |
3979
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|
5138 } |
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diff
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|
5139 }; |
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diff
changeset
|
5140 |
4dfb2df418f2
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diff
changeset
|
5141 // Driver routine for parallel reference enqueing. |
4dfb2df418f2
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diff
changeset
|
5142 // Creates an instance of the ref enqueueing gang |
4dfb2df418f2
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diff
changeset
|
5143 // task and has the worker threads execute it. |
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diff
changeset
|
5144 |
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diff
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|
5145 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
4dfb2df418f2
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diff
changeset
|
5146 assert(_workers != NULL, "Need parallel worker threads."); |
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diff
changeset
|
5147 |
4dfb2df418f2
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diff
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|
5148 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
4dfb2df418f2
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|
5149 |
4dfb2df418f2
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diff
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|
5150 _g1h->set_par_threads(_active_workers); |
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|
5151 _workers->run_task(&enq_task_proxy); |
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|
5152 _g1h->set_par_threads(0); |
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|
5153 } |
4dfb2df418f2
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diff
changeset
|
5154 |
4dfb2df418f2
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diff
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|
5155 // End of weak reference support closures |
4dfb2df418f2
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diff
changeset
|
5156 |
4dfb2df418f2
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|
5157 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5158 // that are in the collection set and are pointed to by reference |
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|
5159 // objects discovered by the CM ref processor. |
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diff
changeset
|
5160 |
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diff
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|
5161 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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|
5162 protected: |
4dfb2df418f2
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diff
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|
5163 G1CollectedHeap* _g1h; |
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diff
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|
5164 RefToScanQueueSet *_queues; |
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|
5165 ParallelTaskTerminator _terminator; |
4728
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|
5166 uint _n_workers; |
3979
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diff
changeset
|
5167 |
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diff
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|
5168 public: |
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diff
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|
5169 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
4dfb2df418f2
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|
5170 AbstractGangTask("ParPreserveCMReferents"), |
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|
5171 _g1h(g1h), |
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diff
changeset
|
5172 _queues(task_queues), |
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diff
changeset
|
5173 _terminator(workers, _queues), |
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diff
changeset
|
5174 _n_workers(workers) |
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diff
changeset
|
5175 { } |
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diff
changeset
|
5176 |
4728
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|
5177 void work(uint worker_id) { |
3979
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|
5178 ResourceMark rm; |
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diff
changeset
|
5179 HandleMark hm; |
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diff
changeset
|
5180 |
4728
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|
5181 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5182 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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|
5183 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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changeset
|
5184 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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diff
changeset
|
5185 |
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diff
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|
5186 pss.set_evac_closure(&scan_evac_cl); |
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|
5187 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5188 pss.set_partial_scan_closure(&partial_scan_cl); |
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changeset
|
5189 |
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diff
changeset
|
5190 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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diff
changeset
|
5191 |
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parents:
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diff
changeset
|
5192 |
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diff
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|
5193 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5194 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5195 |
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diff
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|
5196 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5197 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
5198 |
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diff
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|
5199 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5200 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5201 |
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diff
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|
5202 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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diff
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|
5203 // We also need to mark copied objects. |
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diff
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|
5204 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5205 copy_perm_cl = ©_mark_perm_cl; |
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parents:
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diff
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|
5206 } |
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parents:
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diff
changeset
|
5207 |
4dfb2df418f2
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diff
changeset
|
5208 // Is alive closure |
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parents:
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diff
changeset
|
5209 G1AlwaysAliveClosure always_alive(_g1h); |
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diff
changeset
|
5210 |
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diff
changeset
|
5211 // Copying keep alive closure. Applied to referent objects that need |
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parents:
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diff
changeset
|
5212 // to be copied. |
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diff
changeset
|
5213 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
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parents:
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diff
changeset
|
5214 |
4dfb2df418f2
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parents:
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diff
changeset
|
5215 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
5216 |
4728
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jmasa
parents:
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diff
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|
5217 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
441e946dc1af
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jmasa
parents:
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diff
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|
5218 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
4dfb2df418f2
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parents:
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diff
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|
5219 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5220 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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parents:
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diff
changeset
|
5221 // So this must be true - but assert just in case someone decides to |
4dfb2df418f2
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parents:
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diff
changeset
|
5222 // change the worker ids. |
4728
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jmasa
parents:
4711
diff
changeset
|
5223 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
4dfb2df418f2
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parents:
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diff
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|
5224 assert(!rp->discovery_is_atomic(), "check this code"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5225 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5226 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
441e946dc1af
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jmasa
parents:
4711
diff
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|
5227 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5228 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5229 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5230 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
4dfb2df418f2
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parents:
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diff
changeset
|
5231 while (iter.has_next()) { |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5232 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5233 // can see some null referent objects. |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5234 iter.load_ptrs(DEBUG_ONLY(true)); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5235 oop ref = iter.obj(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5236 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5237 // This will filter nulls. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5238 if (iter.is_referent_alive()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 iter.make_referent_alive(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 iter.move_to_next(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5242 } |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5243 } |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5244 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 // Drain the queue - which may cause stealing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5247 drain_queue.do_void(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5252 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 // Weak Reference processing during an evacuation pause (part 1). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5254 void G1CollectedHeap::process_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 double ref_proc_start = os::elapsedTime(); |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5256 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5257 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 // Any reference objects, in the collection set, that were 'discovered' |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 // 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
|
5262 // 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
|
5263 // by following an RSet entry). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5264 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5265 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5266 // reference objects point to may not have been copied: the STW ref |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 // processor would have seen that the reference object had already |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 // been 'discovered' and would have skipped discovering the reference, |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5269 // but would not have treated the reference object as a regular oop. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 // As a reult the copy closure would not have been applied to the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 // referent object. |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5272 // |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5273 // We need to explicitly copy these referent objects - the references |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 // will be processed at the end of remarking. |
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 // We also need to do this copying before we process the reference |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5277 // objects discovered by the STW ref processor in case one of these |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
5278 // referents points to another object which is also referenced by an |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 // object discovered by the STW ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5280 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5281 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5282 workers()->active_workers() : 1); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5283 |
4711 | 5284 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
5285 active_workers == workers()->active_workers(), | |
5286 "Need to reset active_workers"); | |
5287 | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5288 set_par_threads(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5289 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5292 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5293 } else { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5294 keep_cm_referents.work(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5295 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5296 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5297 set_par_threads(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5298 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5299 // Closure to test whether a referent is alive. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5300 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5301 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5303 // of JNI refs is serial and performed serially by the current thread |
4dfb2df418f2
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parents:
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diff
changeset
|
5304 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5305 // JNI refs. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5306 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 // Use only a single queue for this PSS. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5308 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5310 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 // closures while we're actually processing the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5312 // reference objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5313 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5314 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5315 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5316 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5317 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5318 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5320 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5321 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5322 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5323 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5325 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5326 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5327 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5328 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5329 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
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parents:
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diff
changeset
|
5330 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
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parents:
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diff
changeset
|
5331 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5332 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
5333 // We also need to mark copied objects. |
4dfb2df418f2
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parents:
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diff
changeset
|
5334 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
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parents:
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diff
changeset
|
5335 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5336 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5337 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5338 // Keep alive closure. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5339 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5341 // Serial Complete GC closure |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5342 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5343 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5344 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5345 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5346 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5347 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5349 rp->process_discovered_references(&is_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5350 &keep_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5351 &drain_queue, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5352 NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5353 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5354 // Parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5355 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5356 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5357 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5358 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5359 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5361 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5364 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5365 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5366 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
|
5367 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5368 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5369 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 // Weak Reference processing during an evacuation pause (part 2). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5373 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5374 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5377 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
|
5378 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5379 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5380 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5381 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5382 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5383 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5384 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5385 // Parallel reference enqueuing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5386 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5387 uint active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5388 assert(active_workers == workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5389 "Need to reset active_workers"); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5390 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5391 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5392 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5393 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5394 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5395 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5396 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5397 rp->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5398 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5399 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5400 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5401 // 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
|
5402 // Should we do that here also? We could, but it is a serial operation |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5403 // and could signicantly increase the pause time. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5404 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5405 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5406 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5407 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5408 |
342 | 5409 void G1CollectedHeap::evacuate_collection_set() { |
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5410 _expand_heap_after_alloc_failure = true; |
342 | 5411 set_evacuation_failed(false); |
5412 | |
5413 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5414 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5415 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5416 | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5417 uint n_workers; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5418 if (G1CollectedHeap::use_parallel_gc_threads()) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5419 n_workers = |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5420 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5421 workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5422 Threads::number_of_non_daemon_threads()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5423 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5424 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5425 "If not dynamic should be using all the workers"); |
4711 | 5426 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5427 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5428 } else { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5429 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5430 "Should be the original non-parallel value"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5431 n_workers = 1; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5432 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5433 |
bca17e38de00
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jmasa
parents:
4090
diff
changeset
|
5434 G1ParTask g1_par_task(this, _task_queues); |
342 | 5435 |
5436 init_for_evac_failure(NULL); | |
5437 | |
5438 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
|
5439 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5440 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
|
5441 double start_par_time_sec = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5442 double end_par_time_sec; |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5443 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5444 { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5445 StrongRootsScope srs(this); |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5446 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5447 if (G1CollectedHeap::use_parallel_gc_threads()) { |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5448 // 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
|
5449 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5450 // These tasks use ShareHeap::_process_strong_tasks |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5451 assert(UseDynamicNumberOfGCThreads || |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5452 workers()->active_workers() == workers()->total_workers(), |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5453 "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
|
5454 workers()->run_task(&g1_par_task); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5455 } else { |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5456 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
|
5457 g1_par_task.work(0); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5458 } |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5459 end_par_time_sec = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5460 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5461 // 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
|
5462 // 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
|
5463 // 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
|
5464 // 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
|
5465 // reported parallel time. |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5466 } |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5467 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5468 double par_time_ms = (end_par_time_sec - start_par_time_sec) * 1000.0; |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5469 g1_policy()->record_par_time(par_time_ms); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5470 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5471 double code_root_fixup_time_ms = |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5472 (os::elapsedTime() - end_par_time_sec) * 1000.0; |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5473 g1_policy()->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
|
5474 |
342 | 5475 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5476 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5477 // Process any discovered reference objects - we have |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5478 // to do this _before_ we retire the GC alloc regions |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5479 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5480 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5481 // not copied during the pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5482 process_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5483 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5484 // Weak root processing. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5485 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5486 // non-perm oops then we will need to process the code blobs |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5487 // here too. |
342 | 5488 { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5489 G1STWIsAliveClosure is_alive(this); |
342 | 5490 G1KeepAliveClosure keep_alive(this); |
5491 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5492 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5493 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5494 release_gc_alloc_regions(); |
342 | 5495 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
|
5496 |
889 | 5497 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5498 concurrent_g1_refine()->set_use_cache(true); |
5499 | |
5500 finalize_for_evac_failure(); | |
5501 | |
5502 if (evacuation_failed()) { | |
5503 remove_self_forwarding_pointers(); | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
5504 if (G1Log::finer()) { |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5505 gclog_or_tty->print(" (to-space overflow)"); |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
5506 } else if (G1Log::fine()) { |
342 | 5507 gclog_or_tty->print("--"); |
5508 } | |
5509 } | |
5510 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5511 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5512 // reference processor's discovered lists. We need to do |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5513 // this after the card table is cleaned (and verified) as |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5514 // the act of enqueuing entries on to the pending list |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5515 // will log these updates (and dirty their associated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5516 // cards). We need these updates logged to update any |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5517 // RSets. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5518 enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5519 |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5520 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5521 RedirtyLoggedCardTableEntryFastClosure redirty; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5522 dirty_card_queue_set().set_closure(&redirty); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5523 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5524 |
5525 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5526 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5527 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5528 } |
342 | 5529 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5530 } | |
5531 | |
2173 | 5532 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5533 size_t* pre_used, |
5534 FreeRegionList* free_list, | |
4072 | 5535 OldRegionSet* old_proxy_set, |
2152 | 5536 HumongousRegionSet* humongous_proxy_set, |
2173 | 5537 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5538 bool par) { |
5539 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5540 if (hr->isHumongous()) { | |
5541 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5542 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5543 } else { | |
4072 | 5544 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5545 free_region(hr, pre_used, free_list, par); |
342 | 5546 } |
2173 | 5547 } else { |
5548 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5549 } |
5550 } | |
5551 | |
2152 | 5552 void G1CollectedHeap::free_region(HeapRegion* hr, |
5553 size_t* pre_used, | |
5554 FreeRegionList* free_list, | |
5555 bool par) { | |
5556 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5557 assert(!hr->is_empty(), "the region should not be empty"); | |
5558 assert(free_list != NULL, "pre-condition"); | |
5559 | |
5560 *pre_used += hr->used(); | |
5561 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
tonyp
parents:
2369
diff
changeset
|
5562 free_list->add_as_head(hr); |
2152 | 5563 } |
5564 | |
5565 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5566 size_t* pre_used, | |
5567 FreeRegionList* free_list, | |
5568 HumongousRegionSet* humongous_proxy_set, | |
5569 bool par) { | |
5570 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5571 assert(free_list != NULL, "pre-condition"); | |
5572 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5573 | |
5574 size_t hr_used = hr->used(); | |
5575 size_t hr_capacity = hr->capacity(); | |
5576 size_t hr_pre_used = 0; | |
5577 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5578 hr->set_notHumongous(); | |
5579 free_region(hr, &hr_pre_used, free_list, par); | |
5580 | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5581 uint i = hr->hrs_index() + 1; |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5582 uint num = 1; |
3766 | 5583 while (i < n_regions()) { |
5584 HeapRegion* curr_hr = region_at(i); | |
2152 | 5585 if (!curr_hr->continuesHumongous()) { |
5586 break; | |
5587 } | |
5588 curr_hr->set_notHumongous(); | |
5589 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5590 num += 1; | |
5591 i += 1; | |
5592 } | |
5593 assert(hr_pre_used == hr_used, | |
5594 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5595 "should be the same", hr_pre_used, hr_used)); | |
5596 *pre_used += hr_pre_used; | |
5597 } | |
5598 | |
5599 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5600 FreeRegionList* free_list, | |
4072 | 5601 OldRegionSet* old_proxy_set, |
2152 | 5602 HumongousRegionSet* humongous_proxy_set, |
5603 bool par) { | |
5604 if (pre_used > 0) { | |
5605 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5606 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5607 assert(_summary_bytes_used >= pre_used, |
5608 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5609 "should be >= pre_used: "SIZE_FORMAT, | |
5610 _summary_bytes_used, pre_used)); | |
342 | 5611 _summary_bytes_used -= pre_used; |
2152 | 5612 } |
5613 if (free_list != NULL && !free_list->is_empty()) { | |
5614 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
tonyp
parents:
2369
diff
changeset
|
5615 _free_list.add_as_head(free_list); |
2152 | 5616 } |
4072 | 5617 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5618 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5619 _old_set.update_from_proxy(old_proxy_set); | |
5620 } | |
2152 | 5621 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5622 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5623 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5624 } |
5625 } | |
5626 | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5627 class G1ParCleanupCTTask : public AbstractGangTask { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5628 CardTableModRefBS* _ct_bs; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5629 G1CollectedHeap* _g1h; |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5630 HeapRegion* volatile _su_head; |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5631 public: |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5632 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5633 G1CollectedHeap* g1h) : |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5634 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
|
5635 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5636 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5637 void work(uint worker_id) { |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5638 HeapRegion* r; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5639 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5640 clear_cards(r); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5641 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5642 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5643 |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5644 void clear_cards(HeapRegion* r) { |
3830
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5645 // Cards of the survivors should have already been dirtied. |
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5646 if (!r->is_survivor()) { |
796
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|
5647 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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6819065: G1: eliminate high serial card table clearing time
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|
5648 } |
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|
5649 } |
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|
5650 }; |
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|
5651 |
940
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|
5652 #ifndef PRODUCT |
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|
5653 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5654 G1CollectedHeap* _g1h; |
940
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|
5655 CardTableModRefBS* _ct_bs; |
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|
5656 public: |
3317
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7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5657 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5658 : _g1h(g1h), _ct_bs(ct_bs) { } |
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|
5659 virtual bool doHeapRegion(HeapRegion* r) { |
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5660 if (r->is_survivor()) { |
3317
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|
5661 _g1h->verify_dirty_region(r); |
940
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|
5662 } else { |
3317
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7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5663 _g1h->verify_not_dirty_region(r); |
940
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|
5664 } |
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|
5665 return false; |
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|
5666 } |
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|
5667 }; |
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|
5668 |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5669 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
063382f9b575
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|
5670 // All of the region should be clean. |
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|
5671 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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|
5672 MemRegion mr(hr->bottom(), hr->end()); |
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|
5673 ct_bs->verify_not_dirty_region(mr); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5674 } |
063382f9b575
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|
5675 |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5676 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
063382f9b575
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5677 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
063382f9b575
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|
5678 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
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|
5679 // retires each region and replaces it with a new one will do a |
063382f9b575
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|
5680 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
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5681 // not dirty that area (one less thing to have to do while holding |
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|
5682 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
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|
5683 // is dirty. |
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|
5684 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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|
5685 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
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|
5686 ct_bs->verify_dirty_region(mr); |
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|
5687 } |
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|
5688 |
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|
5689 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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|
5690 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
2433
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|
5691 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
063382f9b575
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|
5692 verify_dirty_region(hr); |
2433
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|
5693 } |
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|
5694 } |
abdfc822206f
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|
5695 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5696 void G1CollectedHeap::verify_dirty_young_regions() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5697 verify_dirty_young_list(_young_list->first_region()); |
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|
5698 verify_dirty_young_list(_young_list->first_survivor_region()); |
abdfc822206f
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|
5699 } |
940
8624da129f0b
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apetrusenko
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|
5700 #endif |
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|
5701 |
342 | 5702 void G1CollectedHeap::cleanUpCardTable() { |
5703 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5704 double start = os::elapsedTime(); | |
5705 | |
4023 | 5706 { |
5707 // Iterate over the dirty cards region list. | |
5708 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
5709 | |
4711 | 5710 if (G1CollectedHeap::use_parallel_gc_threads()) { |
5711 set_par_threads(); | |
4023 | 5712 workers()->run_task(&cleanup_task); |
5713 set_par_threads(0); | |
5714 } else { | |
5715 while (_dirty_cards_region_list) { | |
5716 HeapRegion* r = _dirty_cards_region_list; | |
5717 cleanup_task.clear_cards(r); | |
5718 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
5719 if (_dirty_cards_region_list == r) { | |
5720 // The last region. | |
5721 _dirty_cards_region_list = NULL; | |
5722 } | |
5723 r->set_next_dirty_cards_region(NULL); | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
5724 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
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|
5725 } |
4023 | 5726 #ifndef PRODUCT |
5727 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
5728 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
5729 heap_region_iterate(&cleanup_verifier); | |
5730 } | |
5731 #endif | |
940
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|
5732 } |
1394
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|
5733 |
342 | 5734 double elapsed = os::elapsedTime() - start; |
3979
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6484982: G1: process references during evacuation pauses
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diff
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|
5735 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
342 | 5736 } |
5737 | |
5738 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5739 size_t pre_used = 0; |
5740 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5741 | |
342 | 5742 double young_time_ms = 0.0; |
5743 double non_young_time_ms = 0.0; | |
5744 | |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5745 // Since the collection set is a superset of the the young list, |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5746 // all we need to do to clear the young list is clear its |
1316cec51b4d
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changeset
|
5747 // head and length, and unlink any young regions in the code below |
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|
5748 _young_list->clear(); |
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|
5749 |
342 | 5750 G1CollectorPolicy* policy = g1_policy(); |
5751 | |
5752 double start_sec = os::elapsedTime(); | |
5753 bool non_young = true; | |
5754 | |
5755 HeapRegion* cur = cs_head; | |
5756 int age_bound = -1; | |
5757 size_t rs_lengths = 0; | |
5758 | |
5759 while (cur != NULL) { | |
2361 | 5760 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 5761 if (non_young) { |
5762 if (cur->is_young()) { | |
5763 double end_sec = os::elapsedTime(); | |
5764 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5765 non_young_time_ms += elapsed_ms; | |
5766 | |
5767 start_sec = os::elapsedTime(); | |
5768 non_young = false; | |
5769 } | |
5770 } else { | |
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5771 if (!cur->is_young()) { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5772 double end_sec = os::elapsedTime(); |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5773 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5774 young_time_ms += elapsed_ms; |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5775 |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5776 start_sec = os::elapsedTime(); |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5777 non_young = true; |
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|
5778 } |
342 | 5779 } |
5780 | |
5781 rs_lengths += cur->rem_set()->occupied(); | |
5782 | |
5783 HeapRegion* next = cur->next_in_collection_set(); | |
5784 assert(cur->in_collection_set(), "bad CS"); | |
5785 cur->set_next_in_collection_set(NULL); | |
5786 cur->set_in_collection_set(false); | |
5787 | |
5788 if (cur->is_young()) { | |
5789 int index = cur->young_index_in_cset(); | |
4090
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|
5790 assert(index != -1, "invariant"); |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
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|
5791 assert((uint) index < policy->young_cset_region_length(), "invariant"); |
342 | 5792 size_t words_survived = _surviving_young_words[index]; |
5793 cur->record_surv_words_in_group(words_survived); | |
1394
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|
5794 |
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|
5795 // At this point the we have 'popped' cur from the collection set |
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|
5796 // (linked via next_in_collection_set()) but it is still in the |
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|
5797 // young list (linked via next_young_region()). Clear the |
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|
5798 // _next_young_region field. |
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|
5799 cur->set_next_young_region(NULL); |
342 | 5800 } else { |
5801 int index = cur->young_index_in_cset(); | |
4090
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|
5802 assert(index == -1, "invariant"); |
342 | 5803 } |
5804 | |
5805 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5806 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5807 "invariant" ); | |
5808 | |
5809 if (!cur->evacuation_failed()) { | |
4097
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|
5810 MemRegion used_mr = cur->used_region(); |
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|
5811 |
342 | 5812 // And the region is empty. |
4097
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diff
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|
5813 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
2152 | 5814 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 5815 } else { |
5816 cur->uninstall_surv_rate_group(); | |
4090
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|
5817 if (cur->is_young()) { |
342 | 5818 cur->set_young_index_in_cset(-1); |
4090
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|
5819 } |
342 | 5820 cur->set_not_young(); |
5821 cur->set_evacuation_failed(false); | |
4072 | 5822 // The region is now considered to be old. |
5823 _old_set.add(cur); | |
342 | 5824 } |
5825 cur = next; | |
5826 } | |
5827 | |
5828 policy->record_max_rs_lengths(rs_lengths); | |
5829 policy->cset_regions_freed(); | |
5830 | |
5831 double end_sec = os::elapsedTime(); | |
5832 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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|
5833 |
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diff
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|
5834 if (non_young) { |
342 | 5835 non_young_time_ms += elapsed_ms; |
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|
5836 } else { |
342 | 5837 young_time_ms += elapsed_ms; |
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|
5838 } |
342 | 5839 |
2152 | 5840 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 5841 NULL /* old_proxy_set */, |
2152 | 5842 NULL /* humongous_proxy_set */, |
5843 false /* par */); | |
342 | 5844 policy->record_young_free_cset_time_ms(young_time_ms); |
5845 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5846 } | |
5847 | |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5848 // This routine is similar to the above but does not record |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5849 // any policy statistics or update free lists; we are abandoning |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5850 // the current incremental collection set in preparation of a |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5851 // full collection. After the full GC we will start to build up |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5852 // the incremental collection set again. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5853 // This is only called when we're doing a full collection |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5854 // and is immediately followed by the tearing down of the young list. |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5855 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5856 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5857 HeapRegion* cur = cs_head; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5858 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5859 while (cur != NULL) { |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5860 HeapRegion* next = cur->next_in_collection_set(); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5861 assert(cur->in_collection_set(), "bad CS"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5862 cur->set_next_in_collection_set(NULL); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5863 cur->set_in_collection_set(false); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5864 cur->set_young_index_in_cset(-1); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5865 cur = next; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5866 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5867 } |
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|
5868 |
2152 | 5869 void G1CollectedHeap::set_free_regions_coming() { |
5870 if (G1ConcRegionFreeingVerbose) { | |
5871 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5872 "setting free regions coming"); | |
5873 } | |
5874 | |
5875 assert(!free_regions_coming(), "pre-condition"); | |
5876 _free_regions_coming = true; | |
342 | 5877 } |
5878 | |
2152 | 5879 void G1CollectedHeap::reset_free_regions_coming() { |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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|
5880 assert(free_regions_coming(), "pre-condition"); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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|
5881 |
2152 | 5882 { |
5883 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5884 _free_regions_coming = false; | |
5885 SecondaryFreeList_lock->notify_all(); | |
5886 } | |
5887 | |
5888 if (G1ConcRegionFreeingVerbose) { | |
5889 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5890 "reset free regions coming"); | |
342 | 5891 } |
5892 } | |
5893 | |
2152 | 5894 void G1CollectedHeap::wait_while_free_regions_coming() { |
5895 // Most of the time we won't have to wait, so let's do a quick test | |
5896 // first before we take the lock. | |
5897 if (!free_regions_coming()) { | |
5898 return; | |
5899 } | |
5900 | |
5901 if (G1ConcRegionFreeingVerbose) { | |
5902 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5903 "waiting for free regions"); | |
342 | 5904 } |
5905 | |
5906 { | |
2152 | 5907 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5908 while (free_regions_coming()) { | |
5909 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5910 } |
2152 | 5911 } |
5912 | |
5913 if (G1ConcRegionFreeingVerbose) { | |
5914 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5915 "done waiting for free regions"); | |
5916 } | |
342 | 5917 } |
5918 | |
5919 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5920 assert(heap_lock_held_for_gc(), | |
5921 "the heap lock should already be held by or for this thread"); | |
5922 _young_list->push_region(hr); | |
5923 } | |
5924 | |
5925 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5926 private: | |
5927 bool _success; | |
5928 public: | |
5929 NoYoungRegionsClosure() : _success(true) { } | |
5930 bool doHeapRegion(HeapRegion* r) { | |
5931 if (r->is_young()) { | |
5932 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5933 r->bottom(), r->end()); | |
5934 _success = false; | |
5935 } | |
5936 return false; | |
5937 } | |
5938 bool success() { return _success; } | |
5939 }; | |
5940 | |
1394
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5941 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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|
5942 bool ret = _young_list->check_list_empty(check_sample); |
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|
5943 |
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|
5944 if (check_heap) { |
342 | 5945 NoYoungRegionsClosure closure; |
5946 heap_region_iterate(&closure); | |
5947 ret = ret && closure.success(); | |
5948 } | |
5949 | |
5950 return ret; | |
5951 } | |
5952 | |
4072 | 5953 class TearDownRegionSetsClosure : public HeapRegionClosure { |
5954 private: | |
5955 OldRegionSet *_old_set; | |
2152 | 5956 |
342 | 5957 public: |
4072 | 5958 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 5959 |
342 | 5960 bool doHeapRegion(HeapRegion* r) { |
4072 | 5961 if (r->is_empty()) { |
5962 // We ignore empty regions, we'll empty the free list afterwards | |
5963 } else if (r->is_young()) { | |
5964 // We ignore young regions, we'll empty the young list afterwards | |
5965 } else if (r->isHumongous()) { | |
5966 // We ignore humongous regions, we're not tearing down the | |
5967 // humongous region set | |
342 | 5968 } else { |
4072 | 5969 // The rest should be old |
5970 _old_set->remove(r); | |
342 | 5971 } |
5972 return false; | |
5973 } | |
5974 | |
4072 | 5975 ~TearDownRegionSetsClosure() { |
5976 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 5977 } |
342 | 5978 }; |
5979 | |
4072 | 5980 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
5981 assert_at_safepoint(true /* should_be_vm_thread */); | |
5982 | |
5983 if (!free_list_only) { | |
5984 TearDownRegionSetsClosure cl(&_old_set); | |
5985 heap_region_iterate(&cl); | |
5986 | |
5987 // Need to do this after the heap iteration to be able to | |
5988 // recognize the young regions and ignore them during the iteration. | |
5989 _young_list->empty_list(); | |
5990 } | |
5991 _free_list.remove_all(); | |
5992 } | |
5993 | |
5994 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
5995 private: | |
5996 bool _free_list_only; | |
5997 OldRegionSet* _old_set; | |
5998 FreeRegionList* _free_list; | |
5999 size_t _total_used; | |
6000 | |
6001 public: | |
6002 RebuildRegionSetsClosure(bool free_list_only, | |
6003 OldRegionSet* old_set, FreeRegionList* free_list) : | |
6004 _free_list_only(free_list_only), | |
6005 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
6006 assert(_free_list->is_empty(), "pre-condition"); | |
6007 if (!free_list_only) { | |
6008 assert(_old_set->is_empty(), "pre-condition"); | |
6009 } | |
6010 } | |
6011 | |
6012 bool doHeapRegion(HeapRegion* r) { | |
6013 if (r->continuesHumongous()) { | |
6014 return false; | |
6015 } | |
6016 | |
6017 if (r->is_empty()) { | |
6018 // Add free regions to the free list | |
6019 _free_list->add_as_tail(r); | |
6020 } else if (!_free_list_only) { | |
6021 assert(!r->is_young(), "we should not come across young regions"); | |
6022 | |
6023 if (r->isHumongous()) { | |
6024 // We ignore humongous regions, we left the humongous set unchanged | |
6025 } else { | |
6026 // The rest should be old, add them to the old set | |
6027 _old_set->add(r); | |
6028 } | |
6029 _total_used += r->used(); | |
6030 } | |
6031 | |
6032 return false; | |
6033 } | |
6034 | |
6035 size_t total_used() { | |
6036 return _total_used; | |
6037 } | |
6038 }; | |
6039 | |
6040 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
6041 assert_at_safepoint(true /* should_be_vm_thread */); | |
6042 | |
6043 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
6044 heap_region_iterate(&cl); | |
6045 | |
6046 if (!free_list_only) { | |
6047 _summary_bytes_used = cl.total_used(); | |
6048 } | |
6049 assert(_summary_bytes_used == recalculate_used(), | |
6050 err_msg("inconsistent _summary_bytes_used, " | |
6051 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
6052 _summary_bytes_used, recalculate_used())); | |
342 | 6053 } |
6054 | |
6055 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
6056 _refine_cte_cl->set_concurrent(concurrent); | |
6057 } | |
6058 | |
6059 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
6060 HeapRegion* hr = heap_region_containing(p); | |
6061 if (hr == NULL) { | |
6062 return is_in_permanent(p); | |
6063 } else { | |
6064 return hr->is_in(p); | |
6065 } | |
6066 } | |
2152 | 6067 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
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|
6068 // Methods for the mutator alloc region |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
6069 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
6070 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
6071 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6072 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6073 assert(!force || g1_policy()->can_expand_young_list(), |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6074 "if force is true we should be able to expand the young list"); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6075 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
6076 if (force || !young_list_full) { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6077 HeapRegion* new_alloc_region = new_region(word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6078 false /* do_expand */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6079 if (new_alloc_region != NULL) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6080 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6081 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6082 return new_alloc_region; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6083 } |
abdfc822206f
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tonyp
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diff
changeset
|
6084 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6085 return NULL; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6086 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
6087 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6088 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
6089 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6090 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
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2432
diff
changeset
|
6091 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6092 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6093 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6094 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
6095 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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3979
diff
changeset
|
6096 // 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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3979
diff
changeset
|
6097 // 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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3979
diff
changeset
|
6098 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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3979
diff
changeset
|
6099 g1mm()->update_eden_size(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6100 } |
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diff
changeset
|
6101 |
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diff
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|
6102 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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2432
diff
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|
6103 bool force) { |
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
6104 return _g1h->new_mutator_alloc_region(word_size, force); |
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2432
diff
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|
6105 } |
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diff
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|
6106 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6107 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6108 // Don't change the number of workers. Use the value previously set |
bca17e38de00
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4090
diff
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|
6109 // in the workgroup. |
4711 | 6110 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
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4711
diff
changeset
|
6111 uint n_workers = workers()->active_workers(); |
4711 | 6112 assert(UseDynamicNumberOfGCThreads || |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6113 n_workers == workers()->total_workers(), |
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diff
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|
6114 "Otherwise should be using the total number of workers"); |
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|
6115 if (n_workers == 0) { |
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6116 assert(false, "Should have been set in prior evacuation pause."); |
bca17e38de00
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4090
diff
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|
6117 n_workers = ParallelGCThreads; |
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diff
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|
6118 workers()->set_active_workers(n_workers); |
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4090
diff
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|
6119 } |
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|
6120 set_par_threads(n_workers); |
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6121 } |
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6122 |
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6123 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
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6124 size_t allocated_bytes) { |
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6125 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
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6126 } |
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6127 |
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6128 // Methods for the GC alloc regions |
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6129 |
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6130 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
6010
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6131 uint count, |
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6132 GCAllocPurpose ap) { |
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6133 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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6134 |
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6135 if (count < g1_policy()->max_regions(ap)) { |
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6136 HeapRegion* new_alloc_region = new_region(word_size, |
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6137 true /* do_expand */); |
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6138 if (new_alloc_region != NULL) { |
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6139 // We really only need to do this for old regions given that we |
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6140 // should never scan survivors. But it doesn't hurt to do it |
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6141 // for survivors too. |
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6142 new_alloc_region->set_saved_mark(); |
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6143 if (ap == GCAllocForSurvived) { |
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6144 new_alloc_region->set_survivor(); |
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6145 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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6146 } else { |
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6147 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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6148 } |
4787
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6149 bool during_im = g1_policy()->during_initial_mark_pause(); |
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6150 new_alloc_region->note_start_of_copying(during_im); |
3830
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6151 return new_alloc_region; |
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6152 } else { |
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6153 g1_policy()->note_alloc_region_limit_reached(ap); |
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6154 } |
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6155 } |
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6156 return NULL; |
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6157 } |
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6158 |
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6159 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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6160 size_t allocated_bytes, |
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6161 GCAllocPurpose ap) { |
4787
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6162 bool during_im = g1_policy()->during_initial_mark_pause(); |
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6163 alloc_region->note_end_of_copying(during_im); |
3830
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6164 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6165 if (ap == GCAllocForSurvived) { |
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6166 young_list()->add_survivor_region(alloc_region); |
4072 | 6167 } else { |
6168 _old_set.add(alloc_region); | |
3830
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6169 } |
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6170 _hr_printer.retire(alloc_region); |
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6171 } |
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6172 |
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6173 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6174 bool force) { |
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6175 assert(!force, "not supported for GC alloc regions"); |
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6176 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6177 } |
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6178 |
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6179 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6180 size_t allocated_bytes) { |
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6181 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6182 GCAllocForSurvived); |
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6183 } |
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6184 |
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6185 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6186 bool force) { |
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6187 assert(!force, "not supported for GC alloc regions"); |
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6188 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6189 } |
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6190 |
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6191 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6192 size_t allocated_bytes) { |
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6193 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6194 GCAllocForTenured); |
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6195 } |
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6196 // Heap region set verification |
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6197 |
2152 | 6198 class VerifyRegionListsClosure : public HeapRegionClosure { |
6199 private: | |
4072 | 6200 FreeRegionList* _free_list; |
6201 OldRegionSet* _old_set; | |
2152 | 6202 HumongousRegionSet* _humongous_set; |
6010
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6203 uint _region_count; |
2152 | 6204 |
6205 public: | |
4072 | 6206 VerifyRegionListsClosure(OldRegionSet* old_set, |
6207 HumongousRegionSet* humongous_set, | |
2152 | 6208 FreeRegionList* free_list) : |
4072 | 6209 _old_set(old_set), _humongous_set(humongous_set), |
6210 _free_list(free_list), _region_count(0) { } | |
2152 | 6211 |
6010
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6212 uint region_count() { return _region_count; } |
2152 | 6213 |
6214 bool doHeapRegion(HeapRegion* hr) { | |
6215 _region_count += 1; | |
6216 | |
6217 if (hr->continuesHumongous()) { | |
6218 return false; | |
6219 } | |
6220 | |
6221 if (hr->is_young()) { | |
6222 // TODO | |
6223 } else if (hr->startsHumongous()) { | |
6224 _humongous_set->verify_next_region(hr); | |
6225 } else if (hr->is_empty()) { | |
6226 _free_list->verify_next_region(hr); | |
4072 | 6227 } else { |
6228 _old_set->verify_next_region(hr); | |
2152 | 6229 } |
6230 return false; | |
6231 } | |
6232 }; | |
6233 | |
6010
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6234 HeapRegion* G1CollectedHeap::new_heap_region(uint hrs_index, |
3766 | 6235 HeapWord* bottom) { |
6236 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6237 MemRegion mr(bottom, end); | |
6238 assert(_g1_reserved.contains(mr), "invariant"); | |
6239 // This might return NULL if the allocation fails | |
6240 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
6241 } | |
6242 | |
2152 | 6243 void G1CollectedHeap::verify_region_sets() { |
6244 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6245 | |
6246 // First, check the explicit lists. | |
6247 _free_list.verify(); | |
6248 { | |
6249 // Given that a concurrent operation might be adding regions to | |
6250 // the secondary free list we have to take the lock before | |
6251 // verifying it. | |
6252 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6253 _secondary_free_list.verify(); | |
6254 } | |
4072 | 6255 _old_set.verify(); |
2152 | 6256 _humongous_set.verify(); |
6257 | |
6258 // If a concurrent region freeing operation is in progress it will | |
6259 // be difficult to correctly attributed any free regions we come | |
6260 // across to the correct free list given that they might belong to | |
6261 // one of several (free_list, secondary_free_list, any local lists, | |
6262 // etc.). So, if that's the case we will skip the rest of the | |
6263 // verification operation. Alternatively, waiting for the concurrent | |
6264 // operation to complete will have a non-trivial effect on the GC's | |
6265 // operation (no concurrent operation will last longer than the | |
6266 // interval between two calls to verification) and it might hide | |
6267 // any issues that we would like to catch during testing. | |
6268 if (free_regions_coming()) { | |
6269 return; | |
6270 } | |
6271 | |
2361 | 6272 // Make sure we append the secondary_free_list on the free_list so |
6273 // that all free regions we will come across can be safely | |
6274 // attributed to the free_list. | |
6275 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6276 |
6277 // Finally, make sure that the region accounting in the lists is | |
6278 // consistent with what we see in the heap. | |
4072 | 6279 _old_set.verify_start(); |
2152 | 6280 _humongous_set.verify_start(); |
6281 _free_list.verify_start(); | |
6282 | |
4072 | 6283 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6284 heap_region_iterate(&cl); |
6285 | |
4072 | 6286 _old_set.verify_end(); |
2152 | 6287 _humongous_set.verify_end(); |
6288 _free_list.verify_end(); | |
342 | 6289 } |