Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 12840:aa6f2ea19d8f
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author | jcoomes |
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date | Fri, 11 Oct 2013 08:27:21 -0700 |
parents | 798522662fcd 69944b868a32 |
children | 8f07aa079343 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
12080 | 26 #include "code/codeCache.hpp" |
1972 | 27 #include "code/icBuffer.hpp" |
28 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
29 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
30 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
31 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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32 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 33 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
34 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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35 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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36 #include "gc_implementation/g1/g1EvacFailure.hpp" |
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37 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
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38 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 39 #include "gc_implementation/g1/g1MarkSweep.hpp" |
40 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
41 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
10405 | 42 #include "gc_implementation/g1/g1YCTypes.hpp" |
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43 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 44 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
45 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
46 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
10405 | 47 #include "gc_implementation/shared/gcHeapSummary.hpp" |
48 #include "gc_implementation/shared/gcTimer.hpp" | |
49 #include "gc_implementation/shared/gcTrace.hpp" | |
50 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 51 #include "gc_implementation/shared/isGCActiveMark.hpp" |
52 #include "memory/gcLocker.inline.hpp" | |
53 #include "memory/genOopClosures.inline.hpp" | |
54 #include "memory/generationSpec.hpp" | |
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55 #include "memory/referenceProcessor.hpp" |
1972 | 56 #include "oops/oop.inline.hpp" |
57 #include "oops/oop.pcgc.inline.hpp" | |
58 #include "runtime/vmThread.hpp" | |
342 | 59 |
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60 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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61 |
342 | 62 // turn it on so that the contents of the young list (scan-only / |
63 // to-be-collected) are printed at "strategic" points before / during | |
64 // / after the collection --- this is useful for debugging | |
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65 #define YOUNG_LIST_VERBOSE 0 |
342 | 66 // CURRENT STATUS |
67 // This file is under construction. Search for "FIXME". | |
68 | |
69 // INVARIANTS/NOTES | |
70 // | |
71 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 72 // serialized by acquiring the HeapLock. This happens in mem_allocate |
73 // and allocate_new_tlab, which are the "entry" points to the | |
74 // allocation code from the rest of the JVM. (Note that this does not | |
75 // apply to TLAB allocation, which is not part of this interface: it | |
76 // is done by clients of this interface.) | |
342 | 77 |
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78 // Notes on implementation of parallelism in different tasks. |
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79 // |
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80 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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81 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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82 // It does use run_task() which sets _n_workers in the task. |
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83 // G1ParTask executes g1_process_strong_roots() -> |
10405 | 84 // SharedHeap::process_strong_roots() which calls eventually to |
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85 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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86 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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87 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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88 // |
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89 |
342 | 90 // Local to this file. |
91 | |
92 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
93 SuspendibleThreadSet* _sts; | |
94 G1RemSet* _g1rs; | |
95 ConcurrentG1Refine* _cg1r; | |
96 bool _concurrent; | |
97 public: | |
98 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
99 G1RemSet* g1rs, | |
100 ConcurrentG1Refine* cg1r) : | |
101 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
102 {} | |
103 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
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104 bool oops_into_cset = _g1rs->refine_card(card_ptr, worker_i, false); |
1705 | 105 // This path is executed by the concurrent refine or mutator threads, |
106 // concurrently, and so we do not care if card_ptr contains references | |
107 // that point into the collection set. | |
108 assert(!oops_into_cset, "should be"); | |
109 | |
342 | 110 if (_concurrent && _sts->should_yield()) { |
111 // Caller will actually yield. | |
112 return false; | |
113 } | |
114 // Otherwise, we finished successfully; return true. | |
115 return true; | |
116 } | |
117 void set_concurrent(bool b) { _concurrent = b; } | |
118 }; | |
119 | |
120 | |
121 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
122 int _calls; | |
123 G1CollectedHeap* _g1h; | |
124 CardTableModRefBS* _ctbs; | |
125 int _histo[256]; | |
126 public: | |
127 ClearLoggedCardTableEntryClosure() : | |
12343 | 128 _calls(0), _g1h(G1CollectedHeap::heap()), _ctbs(_g1h->g1_barrier_set()) |
342 | 129 { |
130 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
131 } | |
132 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
133 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
134 _calls++; | |
135 unsigned char* ujb = (unsigned char*)card_ptr; | |
136 int ind = (int)(*ujb); | |
137 _histo[ind]++; | |
138 *card_ptr = -1; | |
139 } | |
140 return true; | |
141 } | |
142 int calls() { return _calls; } | |
143 void print_histo() { | |
144 gclog_or_tty->print_cr("Card table value histogram:"); | |
145 for (int i = 0; i < 256; i++) { | |
146 if (_histo[i] != 0) { | |
147 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
148 } | |
149 } | |
150 } | |
151 }; | |
152 | |
153 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
154 int _calls; | |
155 G1CollectedHeap* _g1h; | |
156 CardTableModRefBS* _ctbs; | |
157 public: | |
158 RedirtyLoggedCardTableEntryClosure() : | |
12343 | 159 _calls(0), _g1h(G1CollectedHeap::heap()), _ctbs(_g1h->g1_barrier_set()) {} |
160 | |
342 | 161 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
162 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
163 _calls++; | |
164 *card_ptr = 0; | |
165 } | |
166 return true; | |
167 } | |
168 int calls() { return _calls; } | |
169 }; | |
170 | |
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171 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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172 public: |
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173 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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174 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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175 return true; |
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176 } |
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177 }; |
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178 |
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179 YoungList::YoungList(G1CollectedHeap* g1h) : |
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180 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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181 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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182 guarantee(check_list_empty(false), "just making sure..."); |
342 | 183 } |
184 | |
185 void YoungList::push_region(HeapRegion *hr) { | |
186 assert(!hr->is_young(), "should not already be young"); | |
187 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
188 | |
189 hr->set_next_young_region(_head); | |
190 _head = hr; | |
191 | |
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192 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 193 ++_length; |
194 } | |
195 | |
196 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 197 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 198 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
199 | |
200 hr->set_next_young_region(_survivor_head); | |
201 if (_survivor_head == NULL) { | |
545 | 202 _survivor_tail = hr; |
342 | 203 } |
204 _survivor_head = hr; | |
205 ++_survivor_length; | |
206 } | |
207 | |
208 void YoungList::empty_list(HeapRegion* list) { | |
209 while (list != NULL) { | |
210 HeapRegion* next = list->get_next_young_region(); | |
211 list->set_next_young_region(NULL); | |
212 list->uninstall_surv_rate_group(); | |
213 list->set_not_young(); | |
214 list = next; | |
215 } | |
216 } | |
217 | |
218 void YoungList::empty_list() { | |
219 assert(check_list_well_formed(), "young list should be well formed"); | |
220 | |
221 empty_list(_head); | |
222 _head = NULL; | |
223 _length = 0; | |
224 | |
225 empty_list(_survivor_head); | |
226 _survivor_head = NULL; | |
545 | 227 _survivor_tail = NULL; |
342 | 228 _survivor_length = 0; |
229 | |
230 _last_sampled_rs_lengths = 0; | |
231 | |
232 assert(check_list_empty(false), "just making sure..."); | |
233 } | |
234 | |
235 bool YoungList::check_list_well_formed() { | |
236 bool ret = true; | |
237 | |
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238 uint length = 0; |
342 | 239 HeapRegion* curr = _head; |
240 HeapRegion* last = NULL; | |
241 while (curr != NULL) { | |
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242 if (!curr->is_young()) { |
342 | 243 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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244 "incorrectly tagged (y: %d, surv: %d)", |
342 | 245 curr->bottom(), curr->end(), |
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246 curr->is_young(), curr->is_survivor()); |
342 | 247 ret = false; |
248 } | |
249 ++length; | |
250 last = curr; | |
251 curr = curr->get_next_young_region(); | |
252 } | |
253 ret = ret && (length == _length); | |
254 | |
255 if (!ret) { | |
256 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
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257 gclog_or_tty->print_cr("### list has %u entries, _length is %u", |
342 | 258 length, _length); |
259 } | |
260 | |
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261 return ret; |
342 | 262 } |
263 | |
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264 bool YoungList::check_list_empty(bool check_sample) { |
342 | 265 bool ret = true; |
266 | |
267 if (_length != 0) { | |
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268 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %u", |
342 | 269 _length); |
270 ret = false; | |
271 } | |
272 if (check_sample && _last_sampled_rs_lengths != 0) { | |
273 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
274 ret = false; | |
275 } | |
276 if (_head != NULL) { | |
277 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
278 ret = false; | |
279 } | |
280 if (!ret) { | |
281 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
282 } | |
283 | |
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284 return ret; |
342 | 285 } |
286 | |
287 void | |
288 YoungList::rs_length_sampling_init() { | |
289 _sampled_rs_lengths = 0; | |
290 _curr = _head; | |
291 } | |
292 | |
293 bool | |
294 YoungList::rs_length_sampling_more() { | |
295 return _curr != NULL; | |
296 } | |
297 | |
298 void | |
299 YoungList::rs_length_sampling_next() { | |
300 assert( _curr != NULL, "invariant" ); | |
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301 size_t rs_length = _curr->rem_set()->occupied(); |
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302 |
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303 _sampled_rs_lengths += rs_length; |
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304 |
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305 // The current region may not yet have been added to the |
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306 // incremental collection set (it gets added when it is |
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307 // retired as the current allocation region). |
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308 if (_curr->in_collection_set()) { |
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309 // Update the collection set policy information for this region |
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310 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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311 } |
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312 |
342 | 313 _curr = _curr->get_next_young_region(); |
314 if (_curr == NULL) { | |
315 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
316 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
317 } | |
318 } | |
319 | |
320 void | |
321 YoungList::reset_auxilary_lists() { | |
322 guarantee( is_empty(), "young list should be empty" ); | |
323 assert(check_list_well_formed(), "young list should be well formed"); | |
324 | |
325 // Add survivor regions to SurvRateGroup. | |
326 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 327 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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328 |
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329 int young_index_in_cset = 0; |
342 | 330 for (HeapRegion* curr = _survivor_head; |
331 curr != NULL; | |
332 curr = curr->get_next_young_region()) { | |
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333 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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334 |
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335 // The region is a non-empty survivor so let's add it to |
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336 // the incremental collection set for the next evacuation |
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337 // pause. |
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338 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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339 young_index_in_cset += 1; |
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340 } |
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341 assert((uint) young_index_in_cset == _survivor_length, "post-condition"); |
342 | 342 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
343 | |
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344 _head = _survivor_head; |
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345 _length = _survivor_length; |
342 | 346 if (_survivor_head != NULL) { |
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347 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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348 assert(_survivor_length > 0, "invariant"); |
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349 _survivor_tail->set_next_young_region(NULL); |
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350 } |
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351 |
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352 // Don't clear the survivor list handles until the start of |
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353 // the next evacuation pause - we need it in order to re-tag |
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354 // the survivor regions from this evacuation pause as 'young' |
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355 // at the start of the next. |
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356 |
545 | 357 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 358 |
359 assert(check_list_well_formed(), "young list should be well formed"); | |
360 } | |
361 | |
362 void YoungList::print() { | |
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363 HeapRegion* lists[] = {_head, _survivor_head}; |
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364 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 365 |
366 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
367 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
368 HeapRegion *curr = lists[list]; | |
369 if (curr == NULL) | |
370 gclog_or_tty->print_cr(" empty"); | |
371 while (curr != NULL) { | |
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372 gclog_or_tty->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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373 HR_FORMAT_PARAMS(curr), |
342 | 374 curr->prev_top_at_mark_start(), |
375 curr->next_top_at_mark_start(), | |
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376 curr->age_in_surv_rate_group_cond()); |
342 | 377 curr = curr->get_next_young_region(); |
378 } | |
379 } | |
380 | |
381 gclog_or_tty->print_cr(""); | |
382 } | |
383 | |
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384 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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385 { |
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386 // Claim the right to put the region on the dirty cards region list |
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387 // by installing a self pointer. |
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388 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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389 if (next == NULL) { |
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390 HeapRegion* res = (HeapRegion*) |
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391 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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392 NULL); |
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393 if (res == NULL) { |
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394 HeapRegion* head; |
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395 do { |
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396 // Put the region to the dirty cards region list. |
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397 head = _dirty_cards_region_list; |
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398 next = (HeapRegion*) |
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399 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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400 if (next == head) { |
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401 assert(hr->get_next_dirty_cards_region() == hr, |
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402 "hr->get_next_dirty_cards_region() != hr"); |
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403 if (next == NULL) { |
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404 // The last region in the list points to itself. |
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405 hr->set_next_dirty_cards_region(hr); |
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406 } else { |
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407 hr->set_next_dirty_cards_region(next); |
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408 } |
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409 } |
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410 } while (next != head); |
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411 } |
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412 } |
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413 } |
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414 |
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415 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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416 { |
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417 HeapRegion* head; |
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418 HeapRegion* hr; |
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419 do { |
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420 head = _dirty_cards_region_list; |
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421 if (head == NULL) { |
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422 return NULL; |
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423 } |
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424 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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425 if (head == new_head) { |
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426 // The last region. |
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427 new_head = NULL; |
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428 } |
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429 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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430 head); |
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431 } while (hr != head); |
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432 assert(hr != NULL, "invariant"); |
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433 hr->set_next_dirty_cards_region(NULL); |
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434 return hr; |
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435 } |
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436 |
342 | 437 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 438 _cg1r->stop(); |
342 | 439 _cmThread->stop(); |
440 } | |
441 | |
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442 #ifdef ASSERT |
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443 // A region is added to the collection set as it is retired |
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444 // so an address p can point to a region which will be in the |
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445 // collection set but has not yet been retired. This method |
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446 // therefore is only accurate during a GC pause after all |
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447 // regions have been retired. It is used for debugging |
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448 // to check if an nmethod has references to objects that can |
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449 // be move during a partial collection. Though it can be |
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450 // inaccurate, it is sufficient for G1 because the conservative |
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451 // implementation of is_scavengable() for G1 will indicate that |
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452 // all nmethods must be scanned during a partial collection. |
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453 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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454 HeapRegion* hr = heap_region_containing(p); |
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455 return hr != NULL && hr->in_collection_set(); |
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456 } |
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457 #endif |
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458 |
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459 // Returns true if the reference points to an object that |
10405 | 460 // can move in an incremental collection. |
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461 bool G1CollectedHeap::is_scavengable(const void* p) { |
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462 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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463 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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464 HeapRegion* hr = heap_region_containing(p); |
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465 if (hr == NULL) { |
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466 // null |
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467 assert(p == NULL, err_msg("Not NULL " PTR_FORMAT ,p)); |
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468 return false; |
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469 } else { |
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470 return !hr->isHumongous(); |
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471 } |
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472 } |
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473 |
342 | 474 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
475 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
12343 | 476 CardTableModRefBS* ct_bs = g1_barrier_set(); |
342 | 477 |
478 // Count the dirty cards at the start. | |
479 CountNonCleanMemRegionClosure count1(this); | |
480 ct_bs->mod_card_iterate(&count1); | |
481 int orig_count = count1.n(); | |
482 | |
483 // First clear the logged cards. | |
484 ClearLoggedCardTableEntryClosure clear; | |
485 dcqs.set_closure(&clear); | |
486 dcqs.apply_closure_to_all_completed_buffers(); | |
487 dcqs.iterate_closure_all_threads(false); | |
488 clear.print_histo(); | |
489 | |
490 // Now ensure that there's no dirty cards. | |
491 CountNonCleanMemRegionClosure count2(this); | |
492 ct_bs->mod_card_iterate(&count2); | |
493 if (count2.n() != 0) { | |
494 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
495 count2.n(), orig_count); | |
496 } | |
497 guarantee(count2.n() == 0, "Card table should be clean."); | |
498 | |
499 RedirtyLoggedCardTableEntryClosure redirty; | |
500 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
501 dcqs.apply_closure_to_all_completed_buffers(); | |
502 dcqs.iterate_closure_all_threads(false); | |
503 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
504 clear.calls(), orig_count); | |
505 guarantee(redirty.calls() == clear.calls(), | |
506 "Or else mechanism is broken."); | |
507 | |
508 CountNonCleanMemRegionClosure count3(this); | |
509 ct_bs->mod_card_iterate(&count3); | |
510 if (count3.n() != orig_count) { | |
511 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
512 orig_count, count3.n()); | |
513 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
514 } | |
515 | |
516 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
517 } | |
518 | |
519 // Private class members. | |
520 | |
521 G1CollectedHeap* G1CollectedHeap::_g1h; | |
522 | |
523 // Private methods. | |
524 | |
2152 | 525 HeapRegion* |
2361 | 526 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 527 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
528 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
529 if (!_secondary_free_list.is_empty()) { | |
530 if (G1ConcRegionFreeingVerbose) { | |
531 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
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532 "secondary_free_list has %u entries", |
2152 | 533 _secondary_free_list.length()); |
534 } | |
535 // It looks as if there are free regions available on the | |
536 // secondary_free_list. Let's move them to the free_list and try | |
537 // again to allocate from it. | |
538 append_secondary_free_list(); | |
539 | |
540 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
541 "empty we should have moved at least one entry to the free_list"); | |
542 HeapRegion* res = _free_list.remove_head(); | |
543 if (G1ConcRegionFreeingVerbose) { | |
544 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
545 "allocated "HR_FORMAT" from secondary_free_list", | |
546 HR_FORMAT_PARAMS(res)); | |
547 } | |
548 return res; | |
549 } | |
550 | |
10405 | 551 // Wait here until we get notified either when (a) there are no |
2152 | 552 // more free regions coming or (b) some regions have been moved on |
553 // the secondary_free_list. | |
554 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
555 } | |
556 | |
557 if (G1ConcRegionFreeingVerbose) { | |
558 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
559 "could not allocate from secondary_free_list"); | |
560 } | |
561 return NULL; | |
562 } | |
563 | |
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564 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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565 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 566 "the only time we use this to allocate a humongous region is " |
567 "when we are allocating a single humongous region"); | |
568 | |
569 HeapRegion* res; | |
570 if (G1StressConcRegionFreeing) { | |
571 if (!_secondary_free_list.is_empty()) { | |
572 if (G1ConcRegionFreeingVerbose) { | |
573 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
574 "forced to look at the secondary_free_list"); | |
575 } | |
2361 | 576 res = new_region_try_secondary_free_list(); |
2152 | 577 if (res != NULL) { |
578 return res; | |
579 } | |
580 } | |
581 } | |
582 res = _free_list.remove_head_or_null(); | |
583 if (res == NULL) { | |
584 if (G1ConcRegionFreeingVerbose) { | |
585 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
586 "res == NULL, trying the secondary_free_list"); | |
587 } | |
2361 | 588 res = new_region_try_secondary_free_list(); |
2152 | 589 } |
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590 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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591 // Currently, only attempts to allocate GC alloc regions set |
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592 // do_expand to true. So, we should only reach here during a |
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593 // safepoint. If this assumption changes we might have to |
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594 // reconsider the use of _expand_heap_after_alloc_failure. |
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595 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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596 |
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597 ergo_verbose1(ErgoHeapSizing, |
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598 "attempt heap expansion", |
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599 ergo_format_reason("region allocation request failed") |
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600 ergo_format_byte("allocation request"), |
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601 word_size * HeapWordSize); |
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602 if (expand(word_size * HeapWordSize)) { |
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603 // Given that expand() succeeded in expanding the heap, and we |
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604 // always expand the heap by an amount aligned to the heap |
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605 // region size, the free list should in theory not be empty. So |
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606 // it would probably be OK to use remove_head(). But the extra |
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607 // check for NULL is unlikely to be a performance issue here (we |
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608 // just expanded the heap!) so let's just be conservative and |
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609 // use remove_head_or_null(). |
3766 | 610 res = _free_list.remove_head_or_null(); |
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611 } else { |
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612 _expand_heap_after_alloc_failure = false; |
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613 } |
342 | 614 } |
615 return res; | |
616 } | |
617 | |
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618 uint G1CollectedHeap::humongous_obj_allocate_find_first(uint num_regions, |
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619 size_t word_size) { |
2361 | 620 assert(isHumongous(word_size), "word_size should be humongous"); |
621 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
622 | |
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623 uint first = G1_NULL_HRS_INDEX; |
2152 | 624 if (num_regions == 1) { |
625 // Only one region to allocate, no need to go through the slower | |
10405 | 626 // path. The caller will attempt the expansion if this fails, so |
2152 | 627 // let's not try to expand here too. |
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628 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 629 if (hr != NULL) { |
630 first = hr->hrs_index(); | |
631 } else { | |
3766 | 632 first = G1_NULL_HRS_INDEX; |
2152 | 633 } |
634 } else { | |
635 // We can't allocate humongous regions while cleanupComplete() is | |
636 // running, since some of the regions we find to be empty might not | |
637 // yet be added to the free list and it is not straightforward to | |
638 // know which list they are on so that we can remove them. Note | |
639 // that we only need to do this if we need to allocate more than | |
640 // one region to satisfy the current humongous allocation | |
641 // request. If we are only allocating one region we use the common | |
642 // region allocation code (see above). | |
643 wait_while_free_regions_coming(); | |
2361 | 644 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 645 |
646 if (free_regions() >= num_regions) { | |
3766 | 647 first = _hrs.find_contiguous(num_regions); |
648 if (first != G1_NULL_HRS_INDEX) { | |
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649 for (uint i = first; i < first + num_regions; ++i) { |
3766 | 650 HeapRegion* hr = region_at(i); |
2152 | 651 assert(hr->is_empty(), "sanity"); |
2361 | 652 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 653 hr->set_pending_removal(true); |
654 } | |
655 _free_list.remove_all_pending(num_regions); | |
656 } | |
657 } | |
658 } | |
659 return first; | |
660 } | |
661 | |
2361 | 662 HeapWord* |
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663 G1CollectedHeap::humongous_obj_allocate_initialize_regions(uint first, |
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664 uint num_regions, |
2361 | 665 size_t word_size) { |
3766 | 666 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 667 assert(isHumongous(word_size), "word_size should be humongous"); |
668 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
669 | |
670 // Index of last region in the series + 1. | |
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671 uint last = first + num_regions; |
2361 | 672 |
673 // We need to initialize the region(s) we just discovered. This is | |
674 // a bit tricky given that it can happen concurrently with | |
675 // refinement threads refining cards on these regions and | |
676 // potentially wanting to refine the BOT as they are scanning | |
677 // those cards (this can happen shortly after a cleanup; see CR | |
678 // 6991377). So we have to set up the region(s) carefully and in | |
679 // a specific order. | |
680 | |
681 // The word size sum of all the regions we will allocate. | |
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682 size_t word_size_sum = (size_t) num_regions * HeapRegion::GrainWords; |
2361 | 683 assert(word_size <= word_size_sum, "sanity"); |
684 | |
685 // This will be the "starts humongous" region. | |
3766 | 686 HeapRegion* first_hr = region_at(first); |
2361 | 687 // The header of the new object will be placed at the bottom of |
688 // the first region. | |
689 HeapWord* new_obj = first_hr->bottom(); | |
690 // This will be the new end of the first region in the series that | |
10405 | 691 // should also match the end of the last region in the series. |
2361 | 692 HeapWord* new_end = new_obj + word_size_sum; |
693 // This will be the new top of the first region that will reflect | |
694 // this allocation. | |
695 HeapWord* new_top = new_obj + word_size; | |
696 | |
697 // First, we need to zero the header of the space that we will be | |
698 // allocating. When we update top further down, some refinement | |
699 // threads might try to scan the region. By zeroing the header we | |
700 // ensure that any thread that will try to scan the region will | |
701 // come across the zero klass word and bail out. | |
702 // | |
703 // NOTE: It would not have been correct to have used | |
704 // CollectedHeap::fill_with_object() and make the space look like | |
705 // an int array. The thread that is doing the allocation will | |
706 // later update the object header to a potentially different array | |
707 // type and, for a very short period of time, the klass and length | |
708 // fields will be inconsistent. This could cause a refinement | |
709 // thread to calculate the object size incorrectly. | |
710 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
711 | |
712 // We will set up the first region as "starts humongous". This | |
713 // will also update the BOT covering all the regions to reflect | |
714 // that there is a single object that starts at the bottom of the | |
715 // first region. | |
716 first_hr->set_startsHumongous(new_top, new_end); | |
717 | |
718 // Then, if there are any, we will set up the "continues | |
719 // humongous" regions. | |
720 HeapRegion* hr = NULL; | |
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721 for (uint i = first + 1; i < last; ++i) { |
3766 | 722 hr = region_at(i); |
2361 | 723 hr->set_continuesHumongous(first_hr); |
724 } | |
725 // If we have "continues humongous" regions (hr != NULL), then the | |
726 // end of the last one should match new_end. | |
727 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
728 | |
729 // Up to this point no concurrent thread would have been able to | |
730 // do any scanning on any region in this series. All the top | |
731 // fields still point to bottom, so the intersection between | |
732 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
733 // update the top fields, we'll do a storestore to make sure that | |
734 // no thread sees the update to top before the zeroing of the | |
735 // object header and the BOT initialization. | |
736 OrderAccess::storestore(); | |
737 | |
738 // Now that the BOT and the object header have been initialized, | |
739 // we can update top of the "starts humongous" region. | |
740 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
741 "new_top should be in this region"); | |
742 first_hr->set_top(new_top); | |
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743 if (_hr_printer.is_active()) { |
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744 HeapWord* bottom = first_hr->bottom(); |
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745 HeapWord* end = first_hr->orig_end(); |
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746 if ((first + 1) == last) { |
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747 // the series has a single humongous region |
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748 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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749 } else { |
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750 // the series has more than one humongous regions |
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751 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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752 } |
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753 } |
2361 | 754 |
755 // Now, we will update the top fields of the "continues humongous" | |
756 // regions. The reason we need to do this is that, otherwise, | |
757 // these regions would look empty and this will confuse parts of | |
758 // G1. For example, the code that looks for a consecutive number | |
759 // of empty regions will consider them empty and try to | |
760 // re-allocate them. We can extend is_empty() to also include | |
761 // !continuesHumongous(), but it is easier to just update the top | |
762 // fields here. The way we set top for all regions (i.e., top == | |
763 // end for all regions but the last one, top == new_top for the | |
764 // last one) is actually used when we will free up the humongous | |
765 // region in free_humongous_region(). | |
766 hr = NULL; | |
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767 for (uint i = first + 1; i < last; ++i) { |
3766 | 768 hr = region_at(i); |
2361 | 769 if ((i + 1) == last) { |
770 // last continues humongous region | |
771 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
772 "new_top should fall on this region"); | |
773 hr->set_top(new_top); | |
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774 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 775 } else { |
776 // not last one | |
777 assert(new_top > hr->end(), "new_top should be above this region"); | |
778 hr->set_top(hr->end()); | |
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779 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 780 } |
781 } | |
782 // If we have continues humongous regions (hr != NULL), then the | |
783 // end of the last one should match new_end and its top should | |
784 // match new_top. | |
785 assert(hr == NULL || | |
786 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
787 | |
788 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
789 _summary_bytes_used += first_hr->used(); | |
790 _humongous_set.add(first_hr); | |
791 | |
792 return new_obj; | |
793 } | |
794 | |
342 | 795 // If could fit into free regions w/o expansion, try. |
796 // Otherwise, if can expand, do so. | |
797 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 798 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 799 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
800 | |
801 verify_region_sets_optional(); | |
342 | 802 |
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803 size_t word_size_rounded = round_to(word_size, HeapRegion::GrainWords); |
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804 uint num_regions = (uint) (word_size_rounded / HeapRegion::GrainWords); |
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805 uint x_num = expansion_regions(); |
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806 uint fs = _hrs.free_suffix(); |
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807 uint first = humongous_obj_allocate_find_first(num_regions, word_size); |
3766 | 808 if (first == G1_NULL_HRS_INDEX) { |
2152 | 809 // The only thing we can do now is attempt expansion. |
6010
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810 if (fs + x_num >= num_regions) { |
2188
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811 // If the number of regions we're trying to allocate for this |
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812 // object is at most the number of regions in the free suffix, |
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813 // then the call to humongous_obj_allocate_find_first() above |
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814 // should have succeeded and we wouldn't be here. |
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815 // |
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816 // We should only be trying to expand when the free suffix is |
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817 // not sufficient for the object _and_ we have some expansion |
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818 // room available. |
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819 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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820 |
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821 ergo_verbose1(ErgoHeapSizing, |
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822 "attempt heap expansion", |
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823 ergo_format_reason("humongous allocation request failed") |
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824 ergo_format_byte("allocation request"), |
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825 word_size * HeapWordSize); |
2188
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826 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 827 // Even though the heap was expanded, it might not have |
828 // reached the desired size. So, we cannot assume that the | |
829 // allocation will succeed. | |
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830 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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831 } |
2152 | 832 } |
833 } | |
834 | |
2361 | 835 HeapWord* result = NULL; |
3766 | 836 if (first != G1_NULL_HRS_INDEX) { |
2361 | 837 result = |
838 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
839 assert(result != NULL, "it should always return a valid result"); | |
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840 |
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841 // A successful humongous object allocation changes the used space |
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842 // information of the old generation so we need to recalculate the |
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843 // sizes and update the jstat counters here. |
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844 g1mm()->update_sizes(); |
2152 | 845 } |
846 | |
847 verify_region_sets_optional(); | |
2361 | 848 |
849 return result; | |
342 | 850 } |
851 | |
1973 | 852 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
853 assert_heap_not_locked_and_not_at_safepoint(); | |
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854 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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855 |
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856 unsigned int dummy_gc_count_before; |
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857 int dummy_gclocker_retry_count = 0; |
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858 return attempt_allocation(word_size, &dummy_gc_count_before, &dummy_gclocker_retry_count); |
342 | 859 } |
860 | |
861 HeapWord* | |
862 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 863 bool* gc_overhead_limit_was_exceeded) { |
864 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 865 |
10405 | 866 // Loop until the allocation is satisfied, or unsatisfied after GC. |
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867 for (int try_count = 1, gclocker_retry_count = 0; /* we'll return */; try_count += 1) { |
1973 | 868 unsigned int gc_count_before; |
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869 |
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870 HeapWord* result = NULL; |
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871 if (!isHumongous(word_size)) { |
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872 result = attempt_allocation(word_size, &gc_count_before, &gclocker_retry_count); |
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873 } else { |
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874 result = attempt_allocation_humongous(word_size, &gc_count_before, &gclocker_retry_count); |
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875 } |
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876 if (result != NULL) { |
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877 return result; |
342 | 878 } |
879 | |
880 // Create the garbage collection operation... | |
1973 | 881 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 882 // ...and get the VM thread to execute it. |
883 VMThread::execute(&op); | |
1973 | 884 |
885 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
886 // If the operation was successful we'll return the result even | |
887 // if it is NULL. If the allocation attempt failed immediately | |
888 // after a Full GC, it's unlikely we'll be able to allocate now. | |
889 HeapWord* result = op.result(); | |
890 if (result != NULL && !isHumongous(word_size)) { | |
891 // Allocations that take place on VM operations do not do any | |
892 // card dirtying and we have to do it here. We only have to do | |
893 // this for non-humongous allocations, though. | |
894 dirty_young_block(result, word_size); | |
895 } | |
342 | 896 return result; |
1973 | 897 } else { |
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898 if (gclocker_retry_count > GCLockerRetryAllocationCount) { |
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899 return NULL; |
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900 } |
1973 | 901 assert(op.result() == NULL, |
902 "the result should be NULL if the VM op did not succeed"); | |
342 | 903 } |
904 | |
905 // Give a warning if we seem to be looping forever. | |
906 if ((QueuedAllocationWarningCount > 0) && | |
907 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 908 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 909 } |
910 } | |
1973 | 911 |
912 ShouldNotReachHere(); | |
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913 return NULL; |
342 | 914 } |
915 | |
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916 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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917 unsigned int *gc_count_before_ret, |
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918 int* gclocker_retry_count_ret) { |
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919 // Make sure you read the note in attempt_allocation_humongous(). |
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920 |
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921 assert_heap_not_locked_and_not_at_safepoint(); |
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922 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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923 "be called for humongous allocation requests"); |
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924 |
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925 // We should only get here after the first-level allocation attempt |
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926 // (attempt_allocation()) failed to allocate. |
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927 |
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928 // We will loop until a) we manage to successfully perform the |
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929 // allocation or b) we successfully schedule a collection which |
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930 // fails to perform the allocation. b) is the only case when we'll |
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|
931 // return NULL. |
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|
932 HeapWord* result = NULL; |
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|
933 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
934 bool should_try_gc; |
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|
935 unsigned int gc_count_before; |
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|
936 |
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|
937 { |
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|
938 MutexLockerEx x(Heap_lock); |
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|
939 |
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940 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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|
941 false /* bot_updates */); |
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942 if (result != NULL) { |
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|
943 return result; |
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|
944 } |
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|
945 |
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|
946 // If we reach here, attempt_allocation_locked() above failed to |
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|
947 // allocate a new region. So the mutator alloc region should be NULL. |
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|
948 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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949 |
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|
950 if (GC_locker::is_active_and_needs_gc()) { |
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951 if (g1_policy()->can_expand_young_list()) { |
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952 // No need for an ergo verbose message here, |
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953 // can_expand_young_list() does this when it returns true. |
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954 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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|
955 false /* bot_updates */); |
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|
956 if (result != NULL) { |
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|
957 return result; |
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|
958 } |
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959 } |
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960 should_try_gc = false; |
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961 } else { |
6106
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962 // The GCLocker may not be active but the GCLocker initiated |
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963 // GC may not yet have been performed (GCLocker::needs_gc() |
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964 // returns true). In this case we do not try this GC and |
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965 // wait until the GCLocker initiated GC is performed, and |
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966 // then retry the allocation. |
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967 if (GC_locker::needs_gc()) { |
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968 should_try_gc = false; |
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969 } else { |
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970 // Read the GC count while still holding the Heap_lock. |
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971 gc_count_before = total_collections(); |
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972 should_try_gc = true; |
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973 } |
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974 } |
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975 } |
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976 |
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977 if (should_try_gc) { |
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|
978 bool succeeded; |
12113
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|
979 result = do_collection_pause(word_size, gc_count_before, &succeeded, |
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980 GCCause::_g1_inc_collection_pause); |
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981 if (result != NULL) { |
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982 assert(succeeded, "only way to get back a non-NULL result"); |
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983 return result; |
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984 } |
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985 |
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986 if (succeeded) { |
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987 // If we get here we successfully scheduled a collection which |
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988 // failed to allocate. No point in trying to allocate |
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989 // further. We'll just return NULL. |
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990 MutexLockerEx x(Heap_lock); |
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991 *gc_count_before_ret = total_collections(); |
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992 return NULL; |
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993 } |
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994 } else { |
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995 if (*gclocker_retry_count_ret > GCLockerRetryAllocationCount) { |
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996 MutexLockerEx x(Heap_lock); |
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997 *gc_count_before_ret = total_collections(); |
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998 return NULL; |
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999 } |
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1000 // The GCLocker is either active or the GCLocker initiated |
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1001 // GC has not yet been performed. Stall until it is and |
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1002 // then retry the allocation. |
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1003 GC_locker::stall_until_clear(); |
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1004 (*gclocker_retry_count_ret) += 1; |
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1005 } |
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1006 |
10405 | 1007 // We can reach here if we were unsuccessful in scheduling a |
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1008 // collection (because another thread beat us to it) or if we were |
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1009 // stalled due to the GC locker. In either can we should retry the |
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1010 // allocation attempt in case another thread successfully |
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1011 // performed a collection and reclaimed enough space. We do the |
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1012 // first attempt (without holding the Heap_lock) here and the |
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1013 // follow-on attempt will be at the start of the next loop |
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1014 // iteration (after taking the Heap_lock). |
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1015 result = _mutator_alloc_region.attempt_allocation(word_size, |
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1016 false /* bot_updates */); |
5963
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1017 if (result != NULL) { |
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1018 return result; |
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1019 } |
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1020 |
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1021 // Give a warning if we seem to be looping forever. |
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1022 if ((QueuedAllocationWarningCount > 0) && |
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1023 (try_count % QueuedAllocationWarningCount == 0)) { |
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1024 warning("G1CollectedHeap::attempt_allocation_slow() " |
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1025 "retries %d times", try_count); |
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1026 } |
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1027 } |
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1028 |
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1029 ShouldNotReachHere(); |
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1030 return NULL; |
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1031 } |
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1032 |
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1033 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1034 unsigned int * gc_count_before_ret, |
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1035 int* gclocker_retry_count_ret) { |
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1036 // The structure of this method has a lot of similarities to |
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1037 // attempt_allocation_slow(). The reason these two were not merged |
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1038 // into a single one is that such a method would require several "if |
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1039 // allocation is not humongous do this, otherwise do that" |
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1040 // conditional paths which would obscure its flow. In fact, an early |
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1041 // version of this code did use a unified method which was harder to |
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1042 // follow and, as a result, it had subtle bugs that were hard to |
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1043 // track down. So keeping these two methods separate allows each to |
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1044 // be more readable. It will be good to keep these two in sync as |
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1045 // much as possible. |
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1046 |
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1047 assert_heap_not_locked_and_not_at_safepoint(); |
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1048 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1049 "should only be called for humongous allocations"); |
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|
1050 |
4834
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1051 // Humongous objects can exhaust the heap quickly, so we should check if we |
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1052 // need to start a marking cycle at each humongous object allocation. We do |
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1053 // the check before we do the actual allocation. The reason for doing it |
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1054 // before the allocation is that we avoid having to keep track of the newly |
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1055 // allocated memory while we do a GC. |
4910
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1056 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
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1057 word_size)) { |
4834
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|
1058 collect(GCCause::_g1_humongous_allocation); |
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|
1059 } |
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|
1060 |
2433
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1061 // We will loop until a) we manage to successfully perform the |
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1062 // allocation or b) we successfully schedule a collection which |
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1063 // fails to perform the allocation. b) is the only case when we'll |
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1064 // return NULL. |
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|
1065 HeapWord* result = NULL; |
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|
1066 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
1067 bool should_try_gc; |
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|
1068 unsigned int gc_count_before; |
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|
1069 |
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|
1070 { |
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|
1071 MutexLockerEx x(Heap_lock); |
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|
1072 |
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1073 // Given that humongous objects are not allocated in young |
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1074 // regions, we'll first try to do the allocation without doing a |
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1075 // collection hoping that there's enough space in the heap. |
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|
1076 result = humongous_obj_allocate(word_size); |
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|
1077 if (result != NULL) { |
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|
1078 return result; |
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|
1079 } |
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|
1080 |
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|
1081 if (GC_locker::is_active_and_needs_gc()) { |
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|
1082 should_try_gc = false; |
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|
1083 } else { |
6106
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1084 // The GCLocker may not be active but the GCLocker initiated |
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|
1085 // GC may not yet have been performed (GCLocker::needs_gc() |
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1086 // returns true). In this case we do not try this GC and |
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|
1087 // wait until the GCLocker initiated GC is performed, and |
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|
1088 // then retry the allocation. |
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|
1089 if (GC_locker::needs_gc()) { |
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|
1090 should_try_gc = false; |
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|
1091 } else { |
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|
1092 // Read the GC count while still holding the Heap_lock. |
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|
1093 gc_count_before = total_collections(); |
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|
1094 should_try_gc = true; |
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|
1095 } |
2433
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|
1096 } |
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|
1097 } |
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|
1098 |
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|
1099 if (should_try_gc) { |
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|
1100 // If we failed to allocate the humongous object, we should try to |
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|
1101 // do a collection pause (if we're allowed) in case it reclaims |
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|
1102 // enough space for the allocation to succeed after the pause. |
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1103 |
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1104 bool succeeded; |
12113
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1105 result = do_collection_pause(word_size, gc_count_before, &succeeded, |
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1106 GCCause::_g1_humongous_allocation); |
2433
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1107 if (result != NULL) { |
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1108 assert(succeeded, "only way to get back a non-NULL result"); |
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1109 return result; |
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1110 } |
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1111 |
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1112 if (succeeded) { |
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1113 // If we get here we successfully scheduled a collection which |
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1114 // failed to allocate. No point in trying to allocate |
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1115 // further. We'll just return NULL. |
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1116 MutexLockerEx x(Heap_lock); |
4910
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1117 *gc_count_before_ret = total_collections(); |
2433
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1118 return NULL; |
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1119 } |
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1120 } else { |
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1121 if (*gclocker_retry_count_ret > GCLockerRetryAllocationCount) { |
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1122 MutexLockerEx x(Heap_lock); |
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1123 *gc_count_before_ret = total_collections(); |
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1124 return NULL; |
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1125 } |
6106
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1126 // The GCLocker is either active or the GCLocker initiated |
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1127 // GC has not yet been performed. Stall until it is and |
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1128 // then retry the allocation. |
2433
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1129 GC_locker::stall_until_clear(); |
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1130 (*gclocker_retry_count_ret) += 1; |
2433
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1131 } |
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1132 |
10405 | 1133 // We can reach here if we were unsuccessful in scheduling a |
2433
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1134 // collection (because another thread beat us to it) or if we were |
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1135 // stalled due to the GC locker. In either can we should retry the |
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1136 // allocation attempt in case another thread successfully |
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1137 // performed a collection and reclaimed enough space. Give a |
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1138 // warning if we seem to be looping forever. |
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1139 |
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1140 if ((QueuedAllocationWarningCount > 0) && |
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1141 (try_count % QueuedAllocationWarningCount == 0)) { |
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1142 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1143 "retries %d times", try_count); |
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1144 } |
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1145 } |
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1146 |
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1147 ShouldNotReachHere(); |
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1148 return NULL; |
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|
1149 } |
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|
1150 |
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1151 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1152 bool expect_null_mutator_alloc_region) { |
2152 | 1153 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1154 assert(_mutator_alloc_region.get() == NULL || |
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1155 !expect_null_mutator_alloc_region, |
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|
1156 "the current alloc region was unexpectedly found to be non-NULL"); |
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|
1157 |
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1158 if (!isHumongous(word_size)) { |
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1159 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1160 false /* bot_updates */); |
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|
1161 } else { |
4829
9509c20bba28
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|
1162 HeapWord* result = humongous_obj_allocate(word_size); |
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|
1163 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
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|
1164 g1_policy()->set_initiate_conc_mark_if_possible(); |
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|
1165 } |
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|
1166 return result; |
2433
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|
1167 } |
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|
1168 |
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|
1169 ShouldNotReachHere(); |
342 | 1170 } |
1171 | |
1172 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
6254
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|
1173 G1CollectedHeap* _g1h; |
342 | 1174 ModRefBarrierSet* _mr_bs; |
1175 public: | |
6254
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|
1176 PostMCRemSetClearClosure(G1CollectedHeap* g1h, ModRefBarrierSet* mr_bs) : |
12080 | 1177 _g1h(g1h), _mr_bs(mr_bs) {} |
1178 | |
342 | 1179 bool doHeapRegion(HeapRegion* r) { |
12080 | 1180 HeapRegionRemSet* hrrs = r->rem_set(); |
1181 | |
6254
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|
1182 if (r->continuesHumongous()) { |
12080 | 1183 // We'll assert that the strong code root list and RSet is empty |
1184 assert(hrrs->strong_code_roots_list_length() == 0, "sanity"); | |
1185 assert(hrrs->occupied() == 0, "RSet should be empty"); | |
342 | 1186 return false; |
6254
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|
1187 } |
12080 | 1188 |
6254
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|
1189 _g1h->reset_gc_time_stamps(r); |
12080 | 1190 hrrs->clear(); |
342 | 1191 // You might think here that we could clear just the cards |
1192 // corresponding to the used region. But no: if we leave a dirty card | |
1193 // in a region we might allocate into, then it would prevent that card | |
1194 // from being enqueued, and cause it to be missed. | |
1195 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1196 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
12080 | 1197 |
342 | 1198 return false; |
1199 } | |
1200 }; | |
1201 | |
6254
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|
1202 void G1CollectedHeap::clear_rsets_post_compaction() { |
12343 | 1203 PostMCRemSetClearClosure rs_clear(this, g1_barrier_set()); |
6254
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1204 heap_region_iterate(&rs_clear); |
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|
1205 } |
342 | 1206 |
626
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|
1207 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
87fa6e083d82
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|
1208 G1CollectedHeap* _g1h; |
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|
1209 UpdateRSOopClosure _cl; |
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diff
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|
1210 int _worker_i; |
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|
1211 public: |
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|
1212 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1213 _cl(g1->g1_rem_set(), worker_i), |
626
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|
1214 _worker_i(worker_i), |
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|
1215 _g1h(g1) |
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|
1216 { } |
1960
878b57474103
6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
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1883
diff
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|
1217 |
626
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|
1218 bool doHeapRegion(HeapRegion* r) { |
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|
1219 if (!r->continuesHumongous()) { |
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|
1220 _cl.set_from(r); |
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|
1221 r->oop_iterate(&_cl); |
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|
1222 } |
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|
1223 return false; |
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|
1224 } |
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|
1225 }; |
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|
1226 |
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|
1227 class ParRebuildRSTask: public AbstractGangTask { |
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diff
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|
1228 G1CollectedHeap* _g1; |
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|
1229 public: |
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|
1230 ParRebuildRSTask(G1CollectedHeap* g1) |
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|
1231 : AbstractGangTask("ParRebuildRSTask"), |
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|
1232 _g1(g1) |
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|
1233 { } |
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|
1234 |
4728
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|
1235 void work(uint worker_id) { |
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|
1236 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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|
1237 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
4095
bca17e38de00
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4090
diff
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|
1238 _g1->workers()->active_workers(), |
626
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|
1239 HeapRegion::RebuildRSClaimValue); |
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|
1240 } |
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|
1241 }; |
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|
1242 |
3778
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|
1243 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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|
1244 private: |
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|
1245 G1HRPrinter* _hr_printer; |
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|
1246 public: |
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|
1247 bool doHeapRegion(HeapRegion* hr) { |
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|
1248 assert(!hr->is_young(), "not expecting to find young regions"); |
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|
1249 // We only generate output for non-empty regions. |
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|
1250 if (!hr->is_empty()) { |
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|
1251 if (!hr->isHumongous()) { |
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1252 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1253 } else if (hr->startsHumongous()) { |
6254
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1254 if (hr->region_num() == 1) { |
3778
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1255 // single humongous region |
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1256 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1257 } else { |
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1258 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1259 } |
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1260 } else { |
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1261 assert(hr->continuesHumongous(), "only way to get here"); |
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1262 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1263 } |
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1264 } |
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1265 return false; |
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|
1266 } |
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1267 |
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1268 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1269 : _hr_printer(hr_printer) { } |
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1270 }; |
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1271 |
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1272 void G1CollectedHeap::print_hrs_post_compaction() { |
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1273 PostCompactionPrinterClosure cl(hr_printer()); |
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1274 heap_region_iterate(&cl); |
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1275 } |
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1276 |
1973 | 1277 bool G1CollectedHeap::do_collection(bool explicit_gc, |
1656
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1278 bool clear_all_soft_refs, |
342 | 1279 size_t word_size) { |
2152 | 1280 assert_at_safepoint(true /* should_be_vm_thread */); |
1281 | |
1359
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1282 if (GC_locker::check_active_before_gc()) { |
1973 | 1283 return false; |
1359
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1284 } |
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|
1285 |
10405 | 1286 STWGCTimer* gc_timer = G1MarkSweep::gc_timer(); |
1287 gc_timer->register_gc_start(os::elapsed_counter()); | |
1288 | |
1289 SerialOldTracer* gc_tracer = G1MarkSweep::gc_tracer(); | |
1290 gc_tracer->report_gc_start(gc_cause(), gc_timer->gc_start()); | |
1291 | |
2125
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1292 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1293 ResourceMark rm; |
1294 | |
4872
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1295 print_heap_before_gc(); |
10405 | 1296 trace_heap_before_gc(gc_tracer); |
838
0316eac49d5a
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|
1297 |
10183
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|
1298 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
6725
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1299 |
4072 | 1300 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1301 verify_region_sets_optional(); |
342 | 1302 |
1387
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|
1303 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1304 collector_policy()->should_clear_all_soft_refs(); |
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|
1305 |
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|
1306 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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|
1307 |
342 | 1308 { |
1309 IsGCActiveMark x; | |
1310 | |
1311 // Timing | |
6030 | 1312 assert(gc_cause() != GCCause::_java_lang_system_gc || explicit_gc, "invariant"); |
6007
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1313 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
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1314 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
6030 | 1315 |
342 | 1316 { |
10405 | 1317 GCTraceTime t(GCCauseString("Full GC", gc_cause()), G1Log::fine(), true, NULL); |
10098
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1318 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
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1319 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1320 |
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1321 double start = os::elapsedTime(); |
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1322 g1_policy()->record_full_collection_start(); |
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1323 |
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1324 // Note: When we have a more flexible GC logging framework that |
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1325 // allows us to add optional attributes to a GC log record we |
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1326 // could consider timing and reporting how long we wait in the |
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1327 // following two methods. |
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|
1328 wait_while_free_regions_coming(); |
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1329 // If we start the compaction before the CM threads finish |
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1330 // scanning the root regions we might trip them over as we'll |
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1331 // be moving objects / updating references. So let's wait until |
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1332 // they are done. By telling them to abort, they should complete |
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1333 // early. |
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|
1334 _cm->root_regions()->abort(); |
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|
1335 _cm->root_regions()->wait_until_scan_finished(); |
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1336 append_secondary_free_list_if_not_empty_with_lock(); |
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|
1337 |
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|
1338 gc_prologue(true); |
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|
1339 increment_total_collections(true /* full gc */); |
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|
1340 increment_old_marking_cycles_started(); |
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|
1341 |
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|
1342 assert(used() == recalculate_used(), "Should be equal"); |
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|
1343 |
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|
1344 verify_before_gc(); |
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|
1345 |
10405 | 1346 pre_full_gc_dump(gc_timer); |
10098
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|
1347 |
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1348 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
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|
1349 |
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|
1350 // Disable discovery and empty the discovered lists |
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|
1351 // for the CM ref processor. |
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|
1352 ref_processor_cm()->disable_discovery(); |
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|
1353 ref_processor_cm()->abandon_partial_discovery(); |
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|
1354 ref_processor_cm()->verify_no_references_recorded(); |
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|
1355 |
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|
1356 // Abandon current iterations of concurrent marking and concurrent |
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|
1357 // refinement, if any are in progress. We have to do this before |
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|
1358 // wait_until_scan_finished() below. |
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|
1359 concurrent_mark()->abort(); |
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|
1360 |
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|
1361 // Make sure we'll choose a new allocation region afterwards. |
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1362 release_mutator_alloc_region(); |
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|
1363 abandon_gc_alloc_regions(); |
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|
1364 g1_rem_set()->cleanupHRRS(); |
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|
1365 |
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1366 // We should call this after we retire any currently active alloc |
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1367 // regions so that all the ALLOC / RETIRE events are generated |
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|
1368 // before the start GC event. |
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|
1369 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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|
1370 |
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1371 // We may have added regions to the current incremental collection |
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1372 // set between the last GC or pause and now. We need to clear the |
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1373 // incremental collection set and then start rebuilding it afresh |
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|
1374 // after this full GC. |
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|
1375 abandon_collection_set(g1_policy()->inc_cset_head()); |
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|
1376 g1_policy()->clear_incremental_cset(); |
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|
1377 g1_policy()->stop_incremental_cset_building(); |
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|
1378 |
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|
1379 tear_down_region_sets(false /* free_list_only */); |
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|
1380 g1_policy()->set_gcs_are_young(true); |
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|
1381 |
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1382 // See the comments in g1CollectedHeap.hpp and |
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1383 // G1CollectedHeap::ref_processing_init() about |
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1384 // how reference processing currently works in G1. |
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|
1385 |
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1386 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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|
1387 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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|
1388 |
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|
1389 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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1390 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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|
1391 |
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|
1392 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1393 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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|
1394 |
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|
1395 // Do collection work |
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|
1396 { |
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|
1397 HandleMark hm; // Discard invalid handles created during gc |
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1398 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
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|
1399 } |
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|
1400 |
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|
1401 assert(free_regions() == 0, "we should not have added any free regions"); |
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|
1402 rebuild_region_sets(false /* free_list_only */); |
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|
1403 |
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|
1404 // Enqueue any discovered reference objects that have |
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1405 // not been removed from the discovered lists. |
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1406 ref_processor_stw()->enqueue_discovered_references(); |
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|
1407 |
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|
1408 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
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|
1409 |
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|
1410 MemoryService::track_memory_usage(); |
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|
1411 |
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|
1412 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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1413 ref_processor_stw()->verify_no_references_recorded(); |
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|
1414 |
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|
1415 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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|
1416 ClassLoaderDataGraph::purge(); |
12080 | 1417 MetaspaceAux::verify_metrics(); |
10098
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|
1418 |
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|
1419 // Note: since we've just done a full GC, concurrent |
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1420 // marking is no longer active. Therefore we need not |
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|
1421 // re-enable reference discovery for the CM ref processor. |
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|
1422 // That will be done at the start of the next marking cycle. |
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|
1423 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1424 ref_processor_cm()->verify_no_references_recorded(); |
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|
1425 |
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|
1426 reset_gc_time_stamp(); |
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|
1427 // Since everything potentially moved, we will clear all remembered |
10405 | 1428 // sets, and clear all cards. Later we will rebuild remembered |
10098
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|
1429 // sets. We will also reset the GC time stamps of the regions. |
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|
1430 clear_rsets_post_compaction(); |
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|
1431 check_gc_time_stamps(); |
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|
1432 |
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|
1433 // Resize the heap if necessary. |
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|
1434 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
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|
1435 |
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|
1436 if (_hr_printer.is_active()) { |
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|
1437 // We should do this after we potentially resize the heap so |
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|
1438 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1439 // the end GC event. |
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|
1440 |
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|
1441 print_hrs_post_compaction(); |
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|
1442 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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|
1443 } |
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|
1444 |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
1445 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
1446 if (hot_card_cache->use_cache()) { |
194f52aa2f23
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|
1447 hot_card_cache->reset_card_counts(); |
194f52aa2f23
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|
1448 hot_card_cache->reset_hot_cache(); |
10098
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|
1449 } |
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|
1450 |
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|
1451 // Rebuild remembered sets of all regions. |
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|
1452 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1453 uint n_workers = |
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|
1454 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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|
1455 workers()->active_workers(), |
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|
1456 Threads::number_of_non_daemon_threads()); |
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|
1457 assert(UseDynamicNumberOfGCThreads || |
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|
1458 n_workers == workers()->total_workers(), |
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|
1459 "If not dynamic should be using all the workers"); |
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|
1460 workers()->set_active_workers(n_workers); |
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|
1461 // Set parallel threads in the heap (_n_par_threads) only |
71013d764f6e
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|
1462 // before a parallel phase and always reset it to 0 after |
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|
1463 // the phase so that the number of parallel threads does |
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|
1464 // no get carried forward to a serial phase where there |
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|
1465 // may be code that is "possibly_parallel". |
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|
1466 set_par_threads(n_workers); |
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|
1467 |
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|
1468 ParRebuildRSTask rebuild_rs_task(this); |
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|
1469 assert(check_heap_region_claim_values( |
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|
1470 HeapRegion::InitialClaimValue), "sanity check"); |
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|
1471 assert(UseDynamicNumberOfGCThreads || |
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|
1472 workers()->active_workers() == workers()->total_workers(), |
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|
1473 "Unless dynamic should use total workers"); |
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|
1474 // Use the most recent number of active workers |
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|
1475 assert(workers()->active_workers() > 0, |
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|
1476 "Active workers not properly set"); |
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|
1477 set_par_threads(workers()->active_workers()); |
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|
1478 workers()->run_task(&rebuild_rs_task); |
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|
1479 set_par_threads(0); |
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|
1480 assert(check_heap_region_claim_values( |
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|
1481 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1482 reset_heap_region_claim_values(); |
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|
1483 } else { |
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|
1484 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1485 heap_region_iterate(&rebuild_rs); |
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|
1486 } |
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|
1487 |
12080 | 1488 // Rebuild the strong code root lists for each region |
1489 rebuild_strong_code_roots(); | |
1490 | |
10098
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|
1491 if (true) { // FIXME |
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|
1492 MetaspaceGC::compute_new_size(); |
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|
1493 } |
342 | 1494 |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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545
diff
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|
1495 #ifdef TRACESPINNING |
10098
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|
1496 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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545
diff
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|
1497 #endif |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
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545
diff
changeset
|
1498 |
10098
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|
1499 // Discard all rset updates |
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|
1500 JavaThread::dirty_card_queue_set().abandon_logs(); |
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|
1501 assert(!G1DeferredRSUpdate |
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|
1502 || (G1DeferredRSUpdate && |
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|
1503 (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
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|
1504 |
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|
1505 _young_list->reset_sampled_info(); |
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|
1506 // At this point there should be no regions in the |
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|
1507 // entire heap tagged as young. |
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|
1508 assert(check_young_list_empty(true /* check_heap */), |
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|
1509 "young list should be empty at this point"); |
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|
1510 |
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|
1511 // Update the number of full collections that have been completed. |
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|
1512 increment_old_marking_cycles_completed(false /* concurrent */); |
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|
1513 |
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|
1514 _hrs.verify_optional(); |
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|
1515 verify_region_sets_optional(); |
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|
1516 |
10373
3a4805ad0005
8015244: G1: Verification after a full GC is incorrectly placed.
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|
1517 verify_after_gc(); |
3a4805ad0005
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diff
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|
1518 |
10098
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|
1519 // Start a new incremental collection set for the next pause |
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|
1520 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1521 g1_policy()->start_incremental_cset_building(); |
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1522 |
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1523 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1524 // regions to the incremental collection set for the next |
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1525 // evacuation pause. |
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1526 clear_cset_fast_test(); |
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1527 |
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1528 init_mutator_alloc_region(); |
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1529 |
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1530 double end = os::elapsedTime(); |
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1531 g1_policy()->record_full_collection_end(); |
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1532 |
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1533 if (G1Log::fine()) { |
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1534 g1_policy()->print_heap_transition(); |
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1535 } |
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1536 |
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1537 // We must call G1MonitoringSupport::update_sizes() in the same scoping level |
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1538 // as an active TraceMemoryManagerStats object (i.e. before the destructor for the |
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1539 // TraceMemoryManagerStats is called) so that the G1 memory pools are updated |
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1540 // before any GC notifications are raised. |
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1541 g1mm()->update_sizes(); |
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1542 |
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1543 gc_epilogue(true); |
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1544 } |
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1545 |
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1546 if (G1Log::finer()) { |
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1547 g1_policy()->print_detailed_heap_transition(true /* full */); |
10098
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1548 } |
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1549 |
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1550 print_heap_after_gc(); |
10405 | 1551 trace_heap_after_gc(gc_tracer); |
1552 | |
1553 post_full_gc_dump(gc_timer); | |
1554 | |
1555 gc_timer->register_gc_end(os::elapsed_counter()); | |
1556 gc_tracer->report_gc_end(gc_timer->gc_end(), gc_timer->time_partitions()); | |
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1557 } |
1973 | 1558 |
1559 return true; | |
342 | 1560 } |
1561 | |
1562 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1563 // do_collection() will return whether it succeeded in performing |
1564 // the GC. Currently, there is no facility on the | |
1565 // do_full_collection() API to notify the caller than the collection | |
1566 // did not succeed (e.g., because it was locked out by the GC | |
1567 // locker). So, right now, we'll ignore the return value. | |
1568 bool dummy = do_collection(true, /* explicit_gc */ | |
1569 clear_all_soft_refs, | |
1570 0 /* word_size */); | |
342 | 1571 } |
1572 | |
1573 // This code is mostly copied from TenuredGeneration. | |
1574 void | |
1575 G1CollectedHeap:: | |
1576 resize_if_necessary_after_full_collection(size_t word_size) { | |
1577 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1578 | |
1579 // Include the current allocation, if any, and bytes that will be | |
1580 // pre-allocated to support collections, as "used". | |
1581 const size_t used_after_gc = used(); | |
1582 const size_t capacity_after_gc = capacity(); | |
1583 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1584 | |
1717
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1585 // This is enforced in arguments.cpp. |
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1586 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1587 "otherwise the code below doesn't make sense"); |
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1588 |
342 | 1589 // We don't have floating point command-line arguments |
1717
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1590 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1591 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1592 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1593 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1594 | |
1717
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1595 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1596 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1597 |
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1598 // We have to be careful here as these two calculations can overflow |
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1599 // 32-bit size_t's. |
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1600 double used_after_gc_d = (double) used_after_gc; |
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1601 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1602 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1603 |
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1604 // Let's make sure that they are both under the max heap size, which |
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1605 // by default will make them fit into a size_t. |
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1606 double desired_capacity_upper_bound = (double) max_heap_size; |
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1607 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1608 desired_capacity_upper_bound); |
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1609 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1610 desired_capacity_upper_bound); |
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1611 |
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1612 // We can now safely turn them into size_t's. |
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1613 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1614 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1615 |
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1616 // This assert only makes sense here, before we adjust them |
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1617 // with respect to the min and max heap size. |
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1618 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1619 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1620 "maximum_desired_capacity = "SIZE_FORMAT, |
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1621 minimum_desired_capacity, maximum_desired_capacity)); |
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1622 |
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1623 // Should not be greater than the heap max size. No need to adjust |
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1624 // it with respect to the heap min size as it's a lower bound (i.e., |
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1625 // we'll try to make the capacity larger than it, not smaller). |
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1626 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1627 // Should not be less than the heap min size. No need to adjust it |
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1628 // with respect to the heap max size as it's an upper bound (i.e., |
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1629 // we'll try to make the capacity smaller than it, not greater). |
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1630 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1631 |
1717
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1632 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1633 // Don't expand unless it's significant |
1634 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
3914
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1635 ergo_verbose4(ErgoHeapSizing, |
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1636 "attempt heap expansion", |
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1637 ergo_format_reason("capacity lower than " |
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1638 "min desired capacity after Full GC") |
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1639 ergo_format_byte("capacity") |
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1640 ergo_format_byte("occupancy") |
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1641 ergo_format_byte_perc("min desired capacity"), |
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1642 capacity_after_gc, used_after_gc, |
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1643 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1644 expand(expand_bytes); |
342 | 1645 |
1646 // No expansion, now see if we want to shrink | |
1717
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1647 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1648 // Capacity too large, compute shrinking size |
1649 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
3914
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1650 ergo_verbose4(ErgoHeapSizing, |
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1651 "attempt heap shrinking", |
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1652 ergo_format_reason("capacity higher than " |
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1653 "max desired capacity after Full GC") |
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1654 ergo_format_byte("capacity") |
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1655 ergo_format_byte("occupancy") |
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1656 ergo_format_byte_perc("max desired capacity"), |
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1657 capacity_after_gc, used_after_gc, |
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1658 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1659 shrink(shrink_bytes); |
1660 } | |
1661 } | |
1662 | |
1663 | |
1664 HeapWord* | |
1973 | 1665 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1666 bool* succeeded) { | |
2152 | 1667 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1668 |
1669 *succeeded = true; | |
1670 // Let's attempt the allocation first. | |
2433
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1671 HeapWord* result = |
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1672 attempt_allocation_at_safepoint(word_size, |
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1673 false /* expect_null_mutator_alloc_region */); |
1973 | 1674 if (result != NULL) { |
1675 assert(*succeeded, "sanity"); | |
1676 return result; | |
1677 } | |
342 | 1678 |
1679 // In a G1 heap, we're supposed to keep allocation from failing by | |
1680 // incremental pauses. Therefore, at least for now, we'll favor | |
1681 // expansion over collection. (This might change in the future if we can | |
1682 // do something smarter than full collection to satisfy a failed alloc.) | |
1683 result = expand_and_allocate(word_size); | |
1684 if (result != NULL) { | |
1973 | 1685 assert(*succeeded, "sanity"); |
342 | 1686 return result; |
1687 } | |
1688 | |
1973 | 1689 // Expansion didn't work, we'll try to do a Full GC. |
1690 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1691 false, /* clear_all_soft_refs */ | |
1692 word_size); | |
1693 if (!gc_succeeded) { | |
1694 *succeeded = false; | |
1695 return NULL; | |
1696 } | |
1697 | |
1698 // Retry the allocation | |
1699 result = attempt_allocation_at_safepoint(word_size, | |
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1700 true /* expect_null_mutator_alloc_region */); |
342 | 1701 if (result != NULL) { |
1973 | 1702 assert(*succeeded, "sanity"); |
342 | 1703 return result; |
1704 } | |
1705 | |
1973 | 1706 // Then, try a Full GC that will collect all soft references. |
1707 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1708 true, /* clear_all_soft_refs */ | |
1709 word_size); | |
1710 if (!gc_succeeded) { | |
1711 *succeeded = false; | |
1712 return NULL; | |
1713 } | |
1714 | |
1715 // Retry the allocation once more | |
1716 result = attempt_allocation_at_safepoint(word_size, | |
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1717 true /* expect_null_mutator_alloc_region */); |
342 | 1718 if (result != NULL) { |
1973 | 1719 assert(*succeeded, "sanity"); |
342 | 1720 return result; |
1721 } | |
1722 | |
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1723 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1724 "Flag should have been handled and cleared prior to this point"); |
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1725 |
342 | 1726 // What else? We might try synchronous finalization later. If the total |
1727 // space available is large enough for the allocation, then a more | |
1728 // complete compaction phase than we've tried so far might be | |
1729 // appropriate. | |
1973 | 1730 assert(*succeeded, "sanity"); |
342 | 1731 return NULL; |
1732 } | |
1733 | |
1734 // Attempting to expand the heap sufficiently | |
1735 // to support an allocation of the given "word_size". If | |
1736 // successful, perform the allocation and return the address of the | |
1737 // allocated block, or else "NULL". | |
1738 | |
1739 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1740 assert_at_safepoint(true /* should_be_vm_thread */); |
1741 | |
1742 verify_region_sets_optional(); | |
1973 | 1743 |
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1744 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1745 ergo_verbose1(ErgoHeapSizing, |
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1746 "attempt heap expansion", |
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1747 ergo_format_reason("allocation request failed") |
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1748 ergo_format_byte("allocation request"), |
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1749 word_size * HeapWordSize); |
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1750 if (expand(expand_bytes)) { |
3766 | 1751 _hrs.verify_optional(); |
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1752 verify_region_sets_optional(); |
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1753 return attempt_allocation_at_safepoint(word_size, |
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1754 false /* expect_null_mutator_alloc_region */); |
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1755 } |
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1756 return NULL; |
342 | 1757 } |
1758 | |
3766 | 1759 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1760 HeapWord* new_end) { | |
1761 assert(old_end != new_end, "don't call this otherwise"); | |
1762 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1763 | |
1764 // Update the committed mem region. | |
1765 _g1_committed.set_end(new_end); | |
1766 // Tell the card table about the update. | |
1767 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1768 // Tell the BOT about the update. | |
1769 _bot_shared->resize(_g1_committed.word_size()); | |
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1770 // Tell the hot card cache about the update |
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1771 _cg1r->hot_card_cache()->resize_card_counts(capacity()); |
3766 | 1772 } |
1773 | |
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1774 bool G1CollectedHeap::expand(size_t expand_bytes) { |
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1775 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1776 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1777 HeapRegion::GrainBytes); | |
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1778 ergo_verbose2(ErgoHeapSizing, |
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1779 "expand the heap", |
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1780 ergo_format_byte("requested expansion amount") |
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1781 ergo_format_byte("attempted expansion amount"), |
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1782 expand_bytes, aligned_expand_bytes); |
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1783 |
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1784 if (_g1_storage.uncommitted_size() == 0) { |
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1785 ergo_verbose0(ErgoHeapSizing, |
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1786 "did not expand the heap", |
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1787 ergo_format_reason("heap already fully expanded")); |
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1788 return false; |
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1789 } |
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1790 |
3766 | 1791 // First commit the memory. |
1792 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1793 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1794 if (successful) { |
3766 | 1795 // Then propagate this update to the necessary data structures. |
1796 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1797 update_committed_space(old_end, new_end); | |
1798 | |
1799 FreeRegionList expansion_list("Local Expansion List"); | |
1800 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1801 assert(mr.start() == old_end, "post-condition"); | |
1802 // mr might be a smaller region than what was requested if | |
1803 // expand_by() was unable to allocate the HeapRegion instances | |
1804 assert(mr.end() <= new_end, "post-condition"); | |
1805 | |
1806 size_t actual_expand_bytes = mr.byte_size(); | |
1807 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1808 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1809 "post-condition"); | |
1810 if (actual_expand_bytes < aligned_expand_bytes) { | |
1811 // We could not expand _hrs to the desired size. In this case we | |
1812 // need to shrink the committed space accordingly. | |
1813 assert(mr.end() < new_end, "invariant"); | |
1814 | |
1815 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1816 // First uncommit the memory. | |
1817 _g1_storage.shrink_by(diff_bytes); | |
1818 // Then propagate this update to the necessary data structures. | |
1819 update_committed_space(new_end, mr.end()); | |
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1820 } |
3766 | 1821 _free_list.add_as_tail(&expansion_list); |
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1822 |
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1823 if (_hr_printer.is_active()) { |
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1824 HeapWord* curr = mr.start(); |
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1825 while (curr < mr.end()) { |
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1826 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1827 _hr_printer.commit(curr, curr_end); |
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1828 curr = curr_end; |
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1829 } |
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1830 assert(curr == mr.end(), "post-condition"); |
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1831 } |
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1832 g1_policy()->record_new_heap_size(n_regions()); |
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1833 } else { |
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1834 ergo_verbose0(ErgoHeapSizing, |
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1835 "did not expand the heap", |
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1836 ergo_format_reason("heap expansion operation failed")); |
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1837 // The expansion of the virtual storage space was unsuccessful. |
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1838 // Let's see if it was because we ran out of swap. |
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1839 if (G1ExitOnExpansionFailure && |
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1840 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1841 // We had head room... |
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1842 vm_exit_out_of_memory(aligned_expand_bytes, OOM_MMAP_ERROR, "G1 heap expansion"); |
342 | 1843 } |
1844 } | |
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1845 return successful; |
342 | 1846 } |
1847 | |
3766 | 1848 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1849 size_t aligned_shrink_bytes = |
1850 ReservedSpace::page_align_size_down(shrink_bytes); | |
1851 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1852 HeapRegion::GrainBytes); | |
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1853 uint num_regions_to_remove = (uint)(shrink_bytes / HeapRegion::GrainBytes); |
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1854 |
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1855 uint num_regions_removed = _hrs.shrink_by(num_regions_to_remove); |
3766 | 1856 HeapWord* old_end = (HeapWord*) _g1_storage.high(); |
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1857 size_t shrunk_bytes = num_regions_removed * HeapRegion::GrainBytes; |
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1858 |
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1859 ergo_verbose3(ErgoHeapSizing, |
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1860 "shrink the heap", |
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1861 ergo_format_byte("requested shrinking amount") |
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1862 ergo_format_byte("aligned shrinking amount") |
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1863 ergo_format_byte("attempted shrinking amount"), |
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1864 shrink_bytes, aligned_shrink_bytes, shrunk_bytes); |
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1865 if (num_regions_removed > 0) { |
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1866 _g1_storage.shrink_by(shrunk_bytes); |
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1867 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
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1868 |
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1869 if (_hr_printer.is_active()) { |
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1870 HeapWord* curr = old_end; |
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1871 while (curr > new_end) { |
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1872 HeapWord* curr_end = curr; |
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1873 curr -= HeapRegion::GrainWords; |
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1874 _hr_printer.uncommit(curr, curr_end); |
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1875 } |
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1876 } |
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1877 |
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1878 _expansion_regions += num_regions_removed; |
3766 | 1879 update_committed_space(old_end, new_end); |
1880 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1881 g1_policy()->record_new_heap_size(n_regions()); |
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1882 } else { |
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1883 ergo_verbose0(ErgoHeapSizing, |
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1884 "did not shrink the heap", |
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1885 ergo_format_reason("heap shrinking operation failed")); |
342 | 1886 } |
1887 } | |
1888 | |
1889 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1890 verify_region_sets_optional(); |
1891 | |
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1892 // We should only reach here at the end of a Full GC which means we |
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1893 // should not not be holding to any GC alloc regions. The method |
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1894 // below will make sure of that and do any remaining clean up. |
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1895 abandon_gc_alloc_regions(); |
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1896 |
2152 | 1897 // Instead of tearing down / rebuilding the free lists here, we |
1898 // could instead use the remove_all_pending() method on free_list to | |
1899 // remove only the ones that we need to remove. | |
4072 | 1900 tear_down_region_sets(true /* free_list_only */); |
342 | 1901 shrink_helper(shrink_bytes); |
4072 | 1902 rebuild_region_sets(true /* free_list_only */); |
2152 | 1903 |
3766 | 1904 _hrs.verify_optional(); |
2152 | 1905 verify_region_sets_optional(); |
342 | 1906 } |
1907 | |
1908 // Public methods. | |
1909 | |
1910 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1911 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1912 #endif // _MSC_VER | |
1913 | |
1914 | |
1915 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1916 SharedHeap(policy_), | |
1917 _g1_policy(policy_), | |
1111 | 1918 _dirty_card_queue_set(false), |
1705 | 1919 _into_cset_dirty_card_queue_set(false), |
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1920 _is_alive_closure_cm(this), |
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1921 _is_alive_closure_stw(this), |
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1922 _ref_processor_cm(NULL), |
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1923 _ref_processor_stw(NULL), |
342 | 1924 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1925 _bot_shared(NULL), | |
10405 | 1926 _evac_failure_scan_stack(NULL), |
342 | 1927 _mark_in_progress(false), |
2152 | 1928 _cg1r(NULL), _summary_bytes_used(0), |
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1929 _g1mm(NULL), |
342 | 1930 _refine_cte_cl(NULL), |
1931 _full_collection(false), | |
2152 | 1932 _free_list("Master Free List"), |
1933 _secondary_free_list("Secondary Free List"), | |
4072 | 1934 _old_set("Old Set"), |
2152 | 1935 _humongous_set("Master Humongous Set"), |
1936 _free_regions_coming(false), | |
342 | 1937 _young_list(new YoungList(this)), |
1938 _gc_time_stamp(0), | |
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1939 _retained_old_gc_alloc_region(NULL), |
6595 | 1940 _survivor_plab_stats(YoungPLABSize, PLABWeight), |
1941 _old_plab_stats(OldPLABSize, PLABWeight), | |
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1942 _expand_heap_after_alloc_failure(true), |
526 | 1943 _surviving_young_words(NULL), |
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1944 _old_marking_cycles_started(0), |
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1945 _old_marking_cycles_completed(0), |
10405 | 1946 _concurrent_cycle_started(false), |
526 | 1947 _in_cset_fast_test(NULL), |
796
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1948 _in_cset_fast_test_base(NULL), |
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1949 _dirty_cards_region_list(NULL), |
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1950 _worker_cset_start_region(NULL), |
10405 | 1951 _worker_cset_start_region_time_stamp(NULL), |
1952 _gc_timer_stw(new (ResourceObj::C_HEAP, mtGC) STWGCTimer()), | |
1953 _gc_timer_cm(new (ResourceObj::C_HEAP, mtGC) ConcurrentGCTimer()), | |
1954 _gc_tracer_stw(new (ResourceObj::C_HEAP, mtGC) G1NewTracer()), | |
1955 _gc_tracer_cm(new (ResourceObj::C_HEAP, mtGC) G1OldTracer()) { | |
1956 | |
1957 _g1h = this; | |
342 | 1958 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { |
1959 vm_exit_during_initialization("Failed necessary allocation."); | |
1960 } | |
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1961 |
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1962 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1963 |
342 | 1964 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1965 _task_queues = new RefToScanQueueSet(n_queues); | |
1966 | |
1967 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1968 assert(n_rem_sets > 0, "Invariant."); | |
1969 | |
6197 | 1970 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues, mtGC); |
1971 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues, mtGC); | |
10405 | 1972 _evacuation_failed_info_array = NEW_C_HEAP_ARRAY(EvacuationFailedInfo, n_queues, mtGC); |
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1973 |
342 | 1974 for (int i = 0; i < n_queues; i++) { |
1975 RefToScanQueue* q = new RefToScanQueue(); | |
1976 q->initialize(); | |
1977 _task_queues->register_queue(i, q); | |
10405 | 1978 ::new (&_evacuation_failed_info_array[i]) EvacuationFailedInfo(); |
1979 } | |
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1980 clear_cset_start_regions(); |
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1981 |
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1982 // Initialize the G1EvacuationFailureALot counters and flags. |
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1983 NOT_PRODUCT(reset_evacuation_should_fail();) |
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1984 |
342 | 1985 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1986 } | |
1987 | |
1988 jint G1CollectedHeap::initialize() { | |
1166 | 1989 CollectedHeap::pre_initialize(); |
342 | 1990 os::enable_vtime(); |
1991 | |
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1992 G1Log::init(); |
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1993 |
342 | 1994 // Necessary to satisfy locking discipline assertions. |
1995 | |
1996 MutexLocker x(Heap_lock); | |
1997 | |
3778
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1998 // We have to initialize the printer before committing the heap, as |
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1999 // it will be used then. |
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2000 _hr_printer.set_active(G1PrintHeapRegions); |
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2001 |
342 | 2002 // While there are no constraints in the GC code that HeapWordSize |
2003 // be any particular value, there are multiple other areas in the | |
2004 // system which believe this to be true (e.g. oop->object_size in some | |
2005 // cases incorrectly returns the size in wordSize units rather than | |
2006 // HeapWordSize). | |
2007 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
2008 | |
2009 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
2010 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
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2011 size_t heap_alignment = collector_policy()->max_alignment(); |
342 | 2012 |
2013 // Ensure that the sizes are properly aligned. | |
2014 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
2015 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
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2016 Universe::check_alignment(max_byte_size, heap_alignment, "g1 heap"); |
342 | 2017 |
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2018 _cg1r = new ConcurrentG1Refine(this); |
342 | 2019 |
2020 // Reserve the maximum. | |
642
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2021 |
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2022 // When compressed oops are enabled, the preferred heap base |
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2023 // is calculated by subtracting the requested size from the |
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2024 // 32Gb boundary and using the result as the base address for |
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2025 // heap reservation. If the requested size is not aligned to |
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2026 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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2027 // into the ReservedHeapSpace constructor) then the actual |
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2028 // base of the reserved heap may end up differing from the |
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2029 // address that was requested (i.e. the preferred heap base). |
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2030 // If this happens then we could end up using a non-optimal |
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2031 // compressed oops mode. |
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2032 |
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2033 ReservedSpace heap_rs = Universe::reserve_heap(max_byte_size, |
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2034 heap_alignment); |
342 | 2035 |
2036 // It is important to do this in a way such that concurrent readers can't | |
10405 | 2037 // temporarily think something is in the heap. (I've actually seen this |
342 | 2038 // happen in asserts: DLD.) |
2039 _reserved.set_word_size(0); | |
2040 _reserved.set_start((HeapWord*)heap_rs.base()); | |
2041 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
2042 | |
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2043 _expansion_regions = (uint) (max_byte_size / HeapRegion::GrainBytes); |
342 | 2044 |
2045 // Create the gen rem set (and barrier set) for the entire reserved region. | |
2046 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
2047 set_barrier_set(rem_set()->bs()); | |
12343 | 2048 if (!barrier_set()->is_a(BarrierSet::G1SATBCTLogging)) { |
2049 vm_exit_during_initialization("G1 requires a G1SATBLoggingCardTableModRefBS"); | |
342 | 2050 return JNI_ENOMEM; |
2051 } | |
2052 | |
2053 // Also create a G1 rem set. | |
12343 | 2054 _g1_rem_set = new G1RemSet(this, g1_barrier_set()); |
342 | 2055 |
2056 // Carve out the G1 part of the heap. | |
2057 | |
2058 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2059 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2060 g1_rs.size()/HeapWordSize); | |
2061 | |
2062 _g1_storage.initialize(g1_rs, 0); | |
2063 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2064 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
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2065 (HeapWord*) _g1_reserved.end()); |
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2066 assert(_hrs.max_length() == _expansion_regions, |
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2067 err_msg("max length: %u expansion regions: %u", |
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2068 _hrs.max_length(), _expansion_regions)); |
342 | 2069 |
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2070 // Do later initialization work for concurrent refinement. |
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2071 _cg1r->init(); |
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2072 |
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2073 // 6843694 - ensure that the maximum region index can fit |
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2074 // in the remembered set structures. |
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2075 const uint max_region_idx = (1U << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
807
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2076 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2077 |
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2078 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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2079 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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2080 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2081 "too many cards per region"); |
807
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2082 |
2152 | 2083 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2084 | |
342 | 2085 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2086 heap_word_size(init_byte_size)); | |
2087 | |
2088 _g1h = this; | |
2089 | |
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2090 _in_cset_fast_test_length = max_regions(); |
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2091 _in_cset_fast_test_base = |
6197 | 2092 NEW_C_HEAP_ARRAY(bool, (size_t) _in_cset_fast_test_length, mtGC); |
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2093 |
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2094 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2095 // beginning of the heap every time we want to index; basically |
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2096 // it's the same with what we do with the card table. |
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2097 _in_cset_fast_test = _in_cset_fast_test_base - |
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2098 ((uintx) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2099 |
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2100 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2101 // regions to the incremental collection set for the first |
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2102 // evacuation pause. |
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2103 clear_cset_fast_test(); |
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2104 |
342 | 2105 // Create the ConcurrentMark data structure and thread. |
2106 // (Must do this late, so that "max_regions" is defined.) | |
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2107 _cm = new ConcurrentMark(this, heap_rs); |
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2108 if (_cm == NULL || !_cm->completed_initialization()) { |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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7207
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|
2109 vm_shutdown_during_initialization("Could not create/initialize ConcurrentMark"); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
2110 return JNI_ENOMEM; |
442f942757c0
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|
2111 } |
342 | 2112 _cmThread = _cm->cmThread(); |
2113 | |
2114 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2115 HeapRegionRemSet::init_heap(max_regions()); | |
2116 | |
677 | 2117 // Now expand into the initial heap size. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
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2173
diff
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|
2118 if (!expand(init_byte_size)) { |
7397
442f942757c0
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|
2119 vm_shutdown_during_initialization("Failed to allocate initial heap."); |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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2173
diff
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|
2120 return JNI_ENOMEM; |
c33825b68624
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2173
diff
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|
2121 } |
342 | 2122 |
2123 // Perform any initialization actions delegated to the policy. | |
2124 g1_policy()->init(); | |
2125 | |
2126 _refine_cte_cl = | |
2127 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2128 g1_rem_set(), | |
2129 concurrent_g1_refine()); | |
2130 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2131 | |
2132 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2133 SATB_Q_FL_lock, | |
1111 | 2134 G1SATBProcessCompletedThreshold, |
342 | 2135 Shared_SATB_Q_lock); |
794 | 2136 |
2137 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2138 DirtyCardQ_FL_lock, | |
1111 | 2139 concurrent_g1_refine()->yellow_zone(), |
2140 concurrent_g1_refine()->red_zone(), | |
794 | 2141 Shared_DirtyCardQ_lock); |
2142 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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595
diff
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|
2143 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
changeset
|
2144 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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595
diff
changeset
|
2145 DirtyCardQ_FL_lock, |
1111 | 2146 -1, // never trigger processing |
2147 -1, // no limit on length | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
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|
2148 Shared_DirtyCardQ_lock, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2149 &JavaThread::dirty_card_queue_set()); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
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|
2150 } |
1705 | 2151 |
2152 // Initialize the card queue set used to hold cards containing | |
2153 // references into the collection set. | |
2154 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2155 DirtyCardQ_FL_lock, | |
2156 -1, // never trigger processing | |
2157 -1, // no limit on length | |
2158 Shared_DirtyCardQ_lock, | |
2159 &JavaThread::dirty_card_queue_set()); | |
2160 | |
342 | 2161 // In case we're keeping closure specialization stats, initialize those |
2162 // counts and that mechanism. | |
2163 SpecializationStats::clear(); | |
2164 | |
2433
abdfc822206f
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2432
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|
2165 // Here we allocate the dummy full region that is required by the |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2166 // G1AllocRegion class. If we don't pass an address in the reserved |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
2167 // space here, lots of asserts fire. |
3766 | 2168 |
2169 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2170 _g1_reserved.start()); | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2171 // We'll re-use the same region whether the alloc region will |
abdfc822206f
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diff
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|
2172 // require BOT updates or not and, if it doesn't, then a non-young |
abdfc822206f
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|
2173 // region will complain that it cannot support allocations without |
abdfc822206f
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|
2174 // BOT updates. So we'll tag the dummy region as young to avoid that. |
abdfc822206f
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|
2175 dummy_region->set_young(); |
abdfc822206f
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diff
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|
2176 // Make sure it's full. |
abdfc822206f
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|
2177 dummy_region->set_top(dummy_region->end()); |
abdfc822206f
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|
2178 G1AllocRegion::setup(this, dummy_region); |
abdfc822206f
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|
2179 |
abdfc822206f
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diff
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|
2180 init_mutator_alloc_region(); |
abdfc822206f
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diff
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|
2181 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
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3285
diff
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|
2182 // Do create of the monitoring and management support so that |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
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|
2183 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
2184 _g1mm = new G1MonitoringSupport(this); |
3289
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diff
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|
2185 |
342 | 2186 return JNI_OK; |
2187 } | |
2188 | |
12233
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12179
diff
changeset
|
2189 size_t G1CollectedHeap::conservative_max_heap_alignment() { |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12179
diff
changeset
|
2190 return HeapRegion::max_region_size(); |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12179
diff
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|
2191 } |
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
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12179
diff
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|
2192 |
342 | 2193 void G1CollectedHeap::ref_processing_init() { |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
2194 // Reference processing in G1 currently works as follows: |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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1973
diff
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|
2195 // |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
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|
2196 // * There are two reference processor instances. One is |
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2197 // used to record and process discovered references |
4dfb2df418f2
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diff
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|
2198 // during concurrent marking; the other is used to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2199 // record and process references during STW pauses |
4dfb2df418f2
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diff
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|
2200 // (both full and incremental). |
4dfb2df418f2
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|
2201 // * Both ref processors need to 'span' the entire heap as |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
2202 // the regions in the collection set may be dotted around. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2203 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
2204 // * For the concurrent marking ref processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2205 // * Reference discovery is enabled at initial marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2206 // * Reference discovery is disabled and the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2207 // references processed etc during remarking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2208 // * Reference discovery is MT (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2209 // * Reference discovery requires a barrier (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2210 // * Reference processing may or may not be MT |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2211 // (depending on the value of ParallelRefProcEnabled |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2212 // and ParallelGCThreads). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2213 // * A full GC disables reference discovery by the CM |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2214 // ref processor and abandons any entries on it's |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2215 // discovered lists. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2216 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2217 // * For the STW processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
2218 // * Non MT discovery is enabled at the start of a full GC. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2219 // * Processing and enqueueing during a full GC is non-MT. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2220 // * During a full GC, references are processed after marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2221 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
2222 // * 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
|
2223 // of an incremental evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2224 // * References are processed near the end of a STW evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2225 // * For both types of GC: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2226 // * Discovery is atomic - i.e. not concurrent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2227 // * Reference discovery will not need a barrier. |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
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diff
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|
2228 |
342 | 2229 SharedHeap::ref_processing_init(); |
2230 MemRegion mr = reserved_region(); | |
3979
4dfb2df418f2
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|
2231 |
4dfb2df418f2
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diff
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|
2232 // Concurrent Mark ref processor |
4dfb2df418f2
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parents:
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diff
changeset
|
2233 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2234 new ReferenceProcessor(mr, // span |
3979
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2235 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2236 // mt processing |
4dfb2df418f2
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diff
changeset
|
2237 (int) ParallelGCThreads, |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2238 // degree of mt processing |
4dfb2df418f2
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parents:
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diff
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|
2239 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
4dfb2df418f2
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parents:
3973
diff
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|
2240 // mt discovery |
4dfb2df418f2
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diff
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|
2241 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
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|
2242 // degree of mt discovery |
4dfb2df418f2
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diff
changeset
|
2243 false, |
4dfb2df418f2
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3973
diff
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|
2244 // Reference discovery is not atomic |
4dfb2df418f2
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diff
changeset
|
2245 &_is_alive_closure_cm, |
4dfb2df418f2
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3973
diff
changeset
|
2246 // is alive closure |
4dfb2df418f2
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3973
diff
changeset
|
2247 // (for efficiency/performance) |
4dfb2df418f2
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johnc
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3973
diff
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|
2248 true); |
4dfb2df418f2
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diff
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|
2249 // Setting next fields of discovered |
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diff
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|
2250 // lists requires a barrier. |
4dfb2df418f2
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diff
changeset
|
2251 |
4dfb2df418f2
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3973
diff
changeset
|
2252 // STW ref processor |
4dfb2df418f2
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3973
diff
changeset
|
2253 _ref_processor_stw = |
4dfb2df418f2
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3973
diff
changeset
|
2254 new ReferenceProcessor(mr, // span |
4dfb2df418f2
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diff
changeset
|
2255 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
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diff
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|
2256 // mt processing |
4dfb2df418f2
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diff
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|
2257 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
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diff
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|
2258 // degree of mt processing |
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3973
diff
changeset
|
2259 (ParallelGCThreads > 1), |
4dfb2df418f2
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diff
changeset
|
2260 // mt discovery |
4dfb2df418f2
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diff
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|
2261 MAX2((int)ParallelGCThreads, 1), |
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parents:
3973
diff
changeset
|
2262 // degree of mt discovery |
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parents:
3973
diff
changeset
|
2263 true, |
4dfb2df418f2
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3973
diff
changeset
|
2264 // Reference discovery is atomic |
4dfb2df418f2
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3973
diff
changeset
|
2265 &_is_alive_closure_stw, |
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parents:
3973
diff
changeset
|
2266 // is alive closure |
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3973
diff
changeset
|
2267 // (for efficiency/performance) |
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3973
diff
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|
2268 false); |
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diff
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|
2269 // Setting next fields of discovered |
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|
2270 // lists requires a barrier. |
342 | 2271 } |
2272 | |
2273 size_t G1CollectedHeap::capacity() const { | |
2274 return _g1_committed.byte_size(); | |
2275 } | |
2276 | |
6254
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|
2277 void G1CollectedHeap::reset_gc_time_stamps(HeapRegion* hr) { |
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|
2278 assert(!hr->continuesHumongous(), "pre-condition"); |
a2f7274eb6ef
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|
2279 hr->reset_gc_time_stamp(); |
a2f7274eb6ef
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|
2280 if (hr->startsHumongous()) { |
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|
2281 uint first_index = hr->hrs_index() + 1; |
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|
2282 uint last_index = hr->last_hc_index(); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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2283 for (uint i = first_index; i < last_index; i += 1) { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2284 HeapRegion* chr = region_at(i); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2285 assert(chr->continuesHumongous(), "sanity"); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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6220
diff
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|
2286 chr->reset_gc_time_stamp(); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2287 } |
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diff
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|
2288 } |
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diff
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|
2289 } |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2290 |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2291 #ifndef PRODUCT |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2292 class CheckGCTimeStampsHRClosure : public HeapRegionClosure { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2293 private: |
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|
2294 unsigned _gc_time_stamp; |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2295 bool _failures; |
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|
2296 |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2297 public: |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2298 CheckGCTimeStampsHRClosure(unsigned gc_time_stamp) : |
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7114678: G1: various small fixes, code cleanup, and refactoring
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2299 _gc_time_stamp(gc_time_stamp), _failures(false) { } |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2300 |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2301 virtual bool doHeapRegion(HeapRegion* hr) { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2302 unsigned region_gc_time_stamp = hr->get_gc_time_stamp(); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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2303 if (_gc_time_stamp != region_gc_time_stamp) { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2304 gclog_or_tty->print_cr("Region "HR_FORMAT" has GC time stamp = %d, " |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2305 "expected %d", HR_FORMAT_PARAMS(hr), |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2306 region_gc_time_stamp, _gc_time_stamp); |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2307 _failures = true; |
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|
2308 } |
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|
2309 return false; |
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|
2310 } |
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|
2311 |
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|
2312 bool failures() { return _failures; } |
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|
2313 }; |
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|
2314 |
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|
2315 void G1CollectedHeap::check_gc_time_stamps() { |
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
2316 CheckGCTimeStampsHRClosure cl(_gc_time_stamp); |
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|
2317 heap_region_iterate(&cl); |
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|
2318 guarantee(!cl.failures(), "all GC time stamps should have been reset"); |
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|
2319 } |
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|
2320 #endif // PRODUCT |
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|
2321 |
1705 | 2322 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2323 DirtyCardQueue* into_cset_dcq, | |
2324 bool concurrent, | |
342 | 2325 int worker_i) { |
889 | 2326 // Clean cards in the hot card cache |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
2327 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
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10242
diff
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|
2328 hot_card_cache->drain(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2329 |
342 | 2330 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2331 int n_completed_buffers = 0; | |
1705 | 2332 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2333 n_completed_buffers++; |
2334 } | |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
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|
2335 g1_policy()->phase_times()->record_update_rs_processed_buffers(worker_i, n_completed_buffers); |
342 | 2336 dcqs.clear_n_completed_buffers(); |
2337 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2338 } | |
2339 | |
2340 | |
2341 // Computes the sum of the storage used by the various regions. | |
2342 | |
2343 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
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parents:
861
diff
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|
2344 assert(Heap_lock->owner() != NULL, |
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
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861
diff
changeset
|
2345 "Should be owned on this thread's behalf."); |
342 | 2346 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2347 // 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
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|
2348 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
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|
2349 if (hr != NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
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|
2350 result += hr->used(); |
342 | 2351 return result; |
2352 } | |
2353 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2354 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
|
2355 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
|
2356 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
2357 } |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
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|
2358 |
342 | 2359 class SumUsedClosure: public HeapRegionClosure { |
2360 size_t _used; | |
2361 public: | |
2362 SumUsedClosure() : _used(0) {} | |
2363 bool doHeapRegion(HeapRegion* r) { | |
2364 if (!r->continuesHumongous()) { | |
2365 _used += r->used(); | |
2366 } | |
2367 return false; | |
2368 } | |
2369 size_t result() { return _used; } | |
2370 }; | |
2371 | |
2372 size_t G1CollectedHeap::recalculate_used() const { | |
2373 SumUsedClosure blk; | |
3766 | 2374 heap_region_iterate(&blk); |
342 | 2375 return blk.result(); |
2376 } | |
2377 | |
2378 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2379 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2380 // otherwise, is there space in the current allocation region? |
2381 | |
2382 // We need to store the current allocation region in a local variable | |
2383 // here. The problem is that this method doesn't take any locks and | |
2384 // there may be other threads which overwrite the current allocation | |
2385 // region field. attempt_allocation(), for example, sets it to NULL | |
2386 // and this can happen *after* the NULL check here but before the call | |
2387 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2388 // to be a problem in the optimized build, since the two loads of the | |
2389 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
2390 HeapRegion* hr = _mutator_alloc_region.get(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
2391 if (hr == NULL) { |
342 | 2392 return 0; |
2393 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
2394 return hr->free(); |
342 | 2395 } |
2396 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
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|
2397 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
|
2398 switch (cause) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2399 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
|
2400 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
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|
2401 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
|
2402 default: return false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2403 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2404 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2405 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2406 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2407 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2408 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2409 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2410 // 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
|
2411 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2412 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2413 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2414 // 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
|
2415 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2416 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2417 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2418 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2419 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2420 // 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
|
2421 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2422 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2423 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2424 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2425 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2426 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2427 |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2428 void G1CollectedHeap::increment_old_marking_cycles_started() { |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2429 assert(_old_marking_cycles_started == _old_marking_cycles_completed || |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2430 _old_marking_cycles_started == _old_marking_cycles_completed + 1, |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2431 err_msg("Wrong marking cycle count (started: %d, completed: %d)", |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2432 _old_marking_cycles_started, _old_marking_cycles_completed)); |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2433 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2434 _old_marking_cycles_started++; |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2435 } |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2436 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2437 void G1CollectedHeap::increment_old_marking_cycles_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2438 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2439 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2440 // 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
|
2441 // 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
|
2442 // 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
|
2443 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2444 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2445 // 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
|
2446 // 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
|
2447 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2448 // 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
|
2449 // 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
|
2450 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2451 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2452 // 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
|
2453 assert(concurrent || |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2454 (_old_marking_cycles_started == _old_marking_cycles_completed + 1) || |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2455 (_old_marking_cycles_started == _old_marking_cycles_completed + 2), |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2456 err_msg("for inner caller (Full GC): _old_marking_cycles_started = %u " |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2457 "is inconsistent with _old_marking_cycles_completed = %u", |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2458 _old_marking_cycles_started, _old_marking_cycles_completed)); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2459 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
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diff
changeset
|
2460 // 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
|
2461 assert(!concurrent || |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2462 (_old_marking_cycles_started == _old_marking_cycles_completed + 1), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2463 err_msg("for outer caller (concurrent cycle): " |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2464 "_old_marking_cycles_started = %u " |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2465 "is inconsistent with _old_marking_cycles_completed = %u", |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2466 _old_marking_cycles_started, _old_marking_cycles_completed)); |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2467 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2468 _old_marking_cycles_completed += 1; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2469 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2470 // 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
|
2471 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2472 // is set) so that if a waiter requests another System.gc() it doesn't |
10405 | 2473 // incorrectly see that a marking cycle is still in progress. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2474 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2475 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2476 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2477 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2478 // 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
|
2479 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2480 // 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
|
2481 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2482 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2483 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2484 |
10405 | 2485 void G1CollectedHeap::register_concurrent_cycle_start(jlong start_time) { |
2486 _concurrent_cycle_started = true; | |
2487 _gc_timer_cm->register_gc_start(start_time); | |
2488 | |
2489 _gc_tracer_cm->report_gc_start(gc_cause(), _gc_timer_cm->gc_start()); | |
2490 trace_heap_before_gc(_gc_tracer_cm); | |
2491 } | |
2492 | |
2493 void G1CollectedHeap::register_concurrent_cycle_end() { | |
2494 if (_concurrent_cycle_started) { | |
2495 if (_cm->has_aborted()) { | |
2496 _gc_tracer_cm->report_concurrent_mode_failure(); | |
2497 } | |
12179
f175e3678be2
8020692: TestGCEventMixed.java failed because of timestamp in event after end event
ehelin
parents:
12116
diff
changeset
|
2498 |
f175e3678be2
8020692: TestGCEventMixed.java failed because of timestamp in event after end event
ehelin
parents:
12116
diff
changeset
|
2499 _gc_timer_cm->register_gc_end(os::elapsed_counter()); |
10405 | 2500 _gc_tracer_cm->report_gc_end(_gc_timer_cm->gc_end(), _gc_timer_cm->time_partitions()); |
2501 | |
2502 _concurrent_cycle_started = false; | |
2503 } | |
2504 } | |
2505 | |
2506 void G1CollectedHeap::trace_heap_after_concurrent_cycle() { | |
2507 if (_concurrent_cycle_started) { | |
2508 trace_heap_after_gc(_gc_tracer_cm); | |
2509 } | |
2510 } | |
2511 | |
2512 G1YCType G1CollectedHeap::yc_type() { | |
2513 bool is_young = g1_policy()->gcs_are_young(); | |
2514 bool is_initial_mark = g1_policy()->during_initial_mark_pause(); | |
2515 bool is_during_mark = mark_in_progress(); | |
2516 | |
2517 if (is_initial_mark) { | |
2518 return InitialMark; | |
2519 } else if (is_during_mark) { | |
2520 return DuringMark; | |
2521 } else if (is_young) { | |
2522 return Normal; | |
2523 } else { | |
2524 return Mixed; | |
2525 } | |
2526 } | |
2527 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2528 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
|
2529 assert_heap_not_locked(); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2530 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2531 unsigned int gc_count_before; |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2532 unsigned int old_marking_count_before; |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2533 bool retry_gc; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2534 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2535 do { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2536 retry_gc = false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2537 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2538 { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2539 MutexLocker ml(Heap_lock); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2540 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2541 // Read the GC count while holding the Heap_lock |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2542 gc_count_before = total_collections(); |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2543 old_marking_count_before = _old_marking_cycles_started; |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2544 } |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2545 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2546 if (should_do_concurrent_full_gc(cause)) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2547 // Schedule an initial-mark evacuation pause that will start a |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2548 // concurrent cycle. We're setting word_size to 0 which means that |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2549 // we are not requesting a post-GC allocation. |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2550 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2551 0, /* word_size */ |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2552 true, /* should_initiate_conc_mark */ |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2553 g1_policy()->max_pause_time_ms(), |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2554 cause); |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2555 |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2556 VMThread::execute(&op); |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2557 if (!op.pause_succeeded()) { |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2558 if (old_marking_count_before == _old_marking_cycles_started) { |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2559 retry_gc = op.should_retry_gc(); |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2560 } else { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2561 // A Full GC happened while we were trying to schedule the |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2562 // initial-mark GC. No point in starting a new cycle given |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2563 // that the whole heap was collected anyway. |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2564 } |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2565 |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2566 if (retry_gc) { |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2567 if (GC_locker::is_active_and_needs_gc()) { |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2568 GC_locker::stall_until_clear(); |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2569 } |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2570 } |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2571 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2572 } else { |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2573 if (cause == GCCause::_gc_locker |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2574 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2575 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2576 // Schedule a standard evacuation pause. We're setting word_size |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2577 // to 0 which means that we are not requesting a post-GC allocation. |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2578 VM_G1IncCollectionPause op(gc_count_before, |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2579 0, /* word_size */ |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2580 false, /* should_initiate_conc_mark */ |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2581 g1_policy()->max_pause_time_ms(), |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2582 cause); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2583 VMThread::execute(&op); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2584 } else { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2585 // Schedule a Full GC. |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2586 VM_G1CollectFull op(gc_count_before, old_marking_count_before, cause); |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2587 VMThread::execute(&op); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2588 } |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2589 } |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2590 } while (retry_gc); |
342 | 2591 } |
2592 | |
2593 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2594 if (_g1_committed.contains(p)) { |
2595 // Given that we know that p is in the committed space, | |
2596 // heap_region_containing_raw() should successfully | |
2597 // return the containing region. | |
2598 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2599 return hr->is_in(p); |
2600 } else { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2601 return false; |
342 | 2602 } |
2603 } | |
2604 | |
2605 // Iteration functions. | |
2606 | |
2607 // Iterates an OopClosure over all ref-containing fields of objects | |
2608 // within a HeapRegion. | |
2609 | |
2610 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2611 MemRegion _mr; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2612 ExtendedOopClosure* _cl; |
342 | 2613 public: |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2614 IterateOopClosureRegionClosure(MemRegion mr, ExtendedOopClosure* cl) |
342 | 2615 : _mr(mr), _cl(cl) {} |
2616 bool doHeapRegion(HeapRegion* r) { | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2617 if (!r->continuesHumongous()) { |
342 | 2618 r->oop_iterate(_cl); |
2619 } | |
2620 return false; | |
2621 } | |
2622 }; | |
2623 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2624 void G1CollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
342 | 2625 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2626 heap_region_iterate(&blk); |
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2627 } |
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2628 |
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2629 void G1CollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
342 | 2630 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2631 heap_region_iterate(&blk); |
342 | 2632 } |
2633 | |
2634 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2635 | |
2636 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2637 ObjectClosure* _cl; | |
2638 public: | |
2639 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2640 bool doHeapRegion(HeapRegion* r) { | |
2641 if (! r->continuesHumongous()) { | |
2642 r->object_iterate(_cl); | |
2643 } | |
2644 return false; | |
2645 } | |
2646 }; | |
2647 | |
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2648 void G1CollectedHeap::object_iterate(ObjectClosure* cl) { |
342 | 2649 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2650 heap_region_iterate(&blk); |
342 | 2651 } |
2652 | |
2653 // Calls a SpaceClosure on a HeapRegion. | |
2654 | |
2655 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2656 SpaceClosure* _cl; | |
2657 public: | |
2658 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2659 bool doHeapRegion(HeapRegion* r) { | |
2660 _cl->do_space(r); | |
2661 return false; | |
2662 } | |
2663 }; | |
2664 | |
2665 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2666 SpaceClosureRegionClosure blk(cl); | |
3766 | 2667 heap_region_iterate(&blk); |
342 | 2668 } |
2669 | |
3766 | 2670 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2671 _hrs.iterate(cl); | |
342 | 2672 } |
2673 | |
2674 void | |
2675 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
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2676 uint worker_id, |
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2677 uint no_of_par_workers, |
342 | 2678 jint claim_value) { |
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2679 const uint regions = n_regions(); |
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2680 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2681 no_of_par_workers : |
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2682 1); |
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2683 assert(UseDynamicNumberOfGCThreads || |
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2684 no_of_par_workers == workers()->total_workers(), |
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2685 "Non dynamic should use fixed number of workers"); |
355 | 2686 // try to spread out the starting points of the workers |
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2687 const HeapRegion* start_hr = |
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2688 start_region_for_worker(worker_id, no_of_par_workers); |
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2689 const uint start_index = start_hr->hrs_index(); |
355 | 2690 |
2691 // each worker will actually look at all regions | |
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2692 for (uint count = 0; count < regions; ++count) { |
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2693 const uint index = (start_index + count) % regions; |
355 | 2694 assert(0 <= index && index < regions, "sanity"); |
2695 HeapRegion* r = region_at(index); | |
2696 // we'll ignore "continues humongous" regions (we'll process them | |
2697 // when we come across their corresponding "start humongous" | |
2698 // region) and regions already claimed | |
2699 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2700 continue; | |
2701 } | |
2702 // OK, try to claim it | |
342 | 2703 if (r->claimHeapRegion(claim_value)) { |
355 | 2704 // success! |
2705 assert(!r->continuesHumongous(), "sanity"); | |
2706 if (r->startsHumongous()) { | |
2707 // If the region is "starts humongous" we'll iterate over its | |
2708 // "continues humongous" first; in fact we'll do them | |
2709 // first. The order is important. In on case, calling the | |
2710 // closure on the "starts humongous" region might de-allocate | |
2711 // and clear all its "continues humongous" regions and, as a | |
2712 // result, we might end up processing them twice. So, we'll do | |
2713 // them first (notice: most closures will ignore them anyway) and | |
2714 // then we'll do the "starts humongous" region. | |
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2715 for (uint ch_index = index + 1; ch_index < regions; ++ch_index) { |
355 | 2716 HeapRegion* chr = region_at(ch_index); |
2717 | |
2718 // if the region has already been claimed or it's not | |
2719 // "continues humongous" we're done | |
2720 if (chr->claim_value() == claim_value || | |
2721 !chr->continuesHumongous()) { | |
2722 break; | |
2723 } | |
2724 | |
10405 | 2725 // No one should have claimed it directly. We can given |
355 | 2726 // that we claimed its "starts humongous" region. |
2727 assert(chr->claim_value() != claim_value, "sanity"); | |
2728 assert(chr->humongous_start_region() == r, "sanity"); | |
2729 | |
2730 if (chr->claimHeapRegion(claim_value)) { | |
10405 | 2731 // we should always be able to claim it; no one else should |
355 | 2732 // be trying to claim this region |
2733 | |
2734 bool res2 = cl->doHeapRegion(chr); | |
2735 assert(!res2, "Should not abort"); | |
2736 | |
2737 // Right now, this holds (i.e., no closure that actually | |
2738 // does something with "continues humongous" regions | |
2739 // clears them). We might have to weaken it in the future, | |
2740 // but let's leave these two asserts here for extra safety. | |
2741 assert(chr->continuesHumongous(), "should still be the case"); | |
2742 assert(chr->humongous_start_region() == r, "sanity"); | |
2743 } else { | |
2744 guarantee(false, "we should not reach here"); | |
2745 } | |
2746 } | |
2747 } | |
2748 | |
2749 assert(!r->continuesHumongous(), "sanity"); | |
2750 bool res = cl->doHeapRegion(r); | |
2751 assert(!res, "Should not abort"); | |
2752 } | |
2753 } | |
2754 } | |
2755 | |
390 | 2756 class ResetClaimValuesClosure: public HeapRegionClosure { |
2757 public: | |
2758 bool doHeapRegion(HeapRegion* r) { | |
2759 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2760 return false; | |
2761 } | |
2762 }; | |
2763 | |
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2764 void G1CollectedHeap::reset_heap_region_claim_values() { |
390 | 2765 ResetClaimValuesClosure blk; |
2766 heap_region_iterate(&blk); | |
2767 } | |
2768 | |
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2769 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2770 ResetClaimValuesClosure blk; |
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2771 collection_set_iterate(&blk); |
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2772 } |
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2773 |
355 | 2774 #ifdef ASSERT |
2775 // This checks whether all regions in the heap have the correct claim | |
2776 // value. I also piggy-backed on this a check to ensure that the | |
2777 // humongous_start_region() information on "continues humongous" | |
2778 // regions is correct. | |
2779 | |
2780 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2781 private: | |
2782 jint _claim_value; | |
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2783 uint _failures; |
355 | 2784 HeapRegion* _sh_region; |
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2785 |
355 | 2786 public: |
2787 CheckClaimValuesClosure(jint claim_value) : | |
2788 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2789 bool doHeapRegion(HeapRegion* r) { | |
2790 if (r->claim_value() != _claim_value) { | |
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2791 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2792 "claim value = %d, should be %d", |
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2793 HR_FORMAT_PARAMS(r), |
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2794 r->claim_value(), _claim_value); |
355 | 2795 ++_failures; |
2796 } | |
2797 if (!r->isHumongous()) { | |
2798 _sh_region = NULL; | |
2799 } else if (r->startsHumongous()) { | |
2800 _sh_region = r; | |
2801 } else if (r->continuesHumongous()) { | |
2802 if (r->humongous_start_region() != _sh_region) { | |
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2803 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2804 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2805 HR_FORMAT_PARAMS(r), |
355 | 2806 r->humongous_start_region(), |
2807 _sh_region); | |
2808 ++_failures; | |
342 | 2809 } |
2810 } | |
355 | 2811 return false; |
2812 } | |
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2813 uint failures() { return _failures; } |
355 | 2814 }; |
2815 | |
2816 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2817 CheckClaimValuesClosure cl(claim_value); | |
2818 heap_region_iterate(&cl); | |
2819 return cl.failures() == 0; | |
2820 } | |
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2821 |
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2822 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2823 private: |
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|
2824 jint _claim_value; |
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2825 uint _failures; |
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|
2826 |
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|
2827 public: |
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|
2828 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2829 _claim_value(claim_value), _failures(0) { } |
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2830 |
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2831 uint failures() { return _failures; } |
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2832 |
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2833 bool doHeapRegion(HeapRegion* hr) { |
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2834 assert(hr->in_collection_set(), "how?"); |
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2835 assert(!hr->isHumongous(), "H-region in CSet"); |
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2836 if (hr->claim_value() != _claim_value) { |
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2837 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2838 "claim value = %d, should be %d", |
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|
2839 HR_FORMAT_PARAMS(hr), |
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|
2840 hr->claim_value(), _claim_value); |
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2841 _failures += 1; |
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|
2842 } |
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|
2843 return false; |
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|
2844 } |
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|
2845 }; |
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|
2846 |
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2847 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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2848 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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2849 collection_set_iterate(&cl); |
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2850 return cl.failures() == 0; |
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2851 } |
355 | 2852 #endif // ASSERT |
342 | 2853 |
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2854 // Clear the cached CSet starting regions and (more importantly) |
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2855 // the time stamps. Called when we reset the GC time stamp. |
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2856 void G1CollectedHeap::clear_cset_start_regions() { |
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2857 assert(_worker_cset_start_region != NULL, "sanity"); |
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2858 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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2859 |
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2860 int n_queues = MAX2((int)ParallelGCThreads, 1); |
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2861 for (int i = 0; i < n_queues; i++) { |
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2862 _worker_cset_start_region[i] = NULL; |
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2863 _worker_cset_start_region_time_stamp[i] = 0; |
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|
2864 } |
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|
2865 } |
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2866 |
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2867 // Given the id of a worker, obtain or calculate a suitable |
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2868 // starting region for iterating over the current collection set. |
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2869 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
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2870 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
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2871 |
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2872 HeapRegion* result = NULL; |
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2873 unsigned gc_time_stamp = get_gc_time_stamp(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2874 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2875 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2876 // Cached starting region for current worker was set |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2877 // during the current pause - so it's valid. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2878 // Note: the cached starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2879 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2880 result = _worker_cset_start_region[worker_i]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2881 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2882 return result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2883 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2884 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2885 // The cached entry was not valid so let's calculate |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2886 // a suitable starting heap region for this worker. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2887 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2888 // We want the parallel threads to start their collection |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2889 // set iteration at different collection set regions to |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2890 // avoid contention. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2891 // If we have: |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2892 // n collection set regions |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2893 // p threads |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2894 // Then thread t will start at region floor ((t * n) / p) |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2895 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2896 result = g1_policy()->collection_set(); |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2897 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2898 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
|
2899 uint active_workers = workers()->active_workers(); |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2900 assert(UseDynamicNumberOfGCThreads || |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2901 active_workers == workers()->total_workers(), |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2902 "Unless dynamic should use total workers"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2903 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2904 uint end_ind = (cs_size * worker_i) / active_workers; |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2905 uint start_ind = 0; |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2906 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2907 if (worker_i > 0 && |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2908 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2909 // Previous workers starting region is valid |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2910 // so let's iterate from there |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2911 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2912 result = _worker_cset_start_region[worker_i - 1]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2913 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2914 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2915 for (uint i = start_ind; i < end_ind; i++) { |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2916 result = result->next_in_collection_set(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2917 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2918 } |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2919 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2920 // Note: the calculated starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2921 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2922 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2923 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2924 "should be updated only once per pause"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2925 _worker_cset_start_region[worker_i] = result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2926 OrderAccess::storestore(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2927 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2928 return result; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2929 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2930 |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2931 HeapRegion* G1CollectedHeap::start_region_for_worker(uint worker_i, |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2932 uint no_of_par_workers) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2933 uint worker_num = |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2934 G1CollectedHeap::use_parallel_gc_threads() ? no_of_par_workers : 1U; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2935 assert(UseDynamicNumberOfGCThreads || |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2936 no_of_par_workers == workers()->total_workers(), |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2937 "Non dynamic should use fixed number of workers"); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2938 const uint start_index = n_regions() * worker_i / worker_num; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2939 return region_at(start_index); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2940 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2941 |
342 | 2942 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2943 HeapRegion* r = g1_policy()->collection_set(); | |
2944 while (r != NULL) { | |
2945 HeapRegion* next = r->next_in_collection_set(); | |
2946 if (cl->doHeapRegion(r)) { | |
2947 cl->incomplete(); | |
2948 return; | |
2949 } | |
2950 r = next; | |
2951 } | |
2952 } | |
2953 | |
2954 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2955 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2956 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2957 // The CSet is empty so there's nothing to do. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2958 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2959 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2960 |
342 | 2961 assert(r->in_collection_set(), |
2962 "Start region must be a member of the collection set."); | |
2963 HeapRegion* cur = r; | |
2964 while (cur != NULL) { | |
2965 HeapRegion* next = cur->next_in_collection_set(); | |
2966 if (cl->doHeapRegion(cur) && false) { | |
2967 cl->incomplete(); | |
2968 return; | |
2969 } | |
2970 cur = next; | |
2971 } | |
2972 cur = g1_policy()->collection_set(); | |
2973 while (cur != r) { | |
2974 HeapRegion* next = cur->next_in_collection_set(); | |
2975 if (cl->doHeapRegion(cur) && false) { | |
2976 cl->incomplete(); | |
2977 return; | |
2978 } | |
2979 cur = next; | |
2980 } | |
2981 } | |
2982 | |
2983 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2984 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2985 } |
2986 | |
2987 | |
2988 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2989 Space* res = heap_region_containing(addr); | |
2990 return res; | |
2991 } | |
2992 | |
2993 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2994 Space* sp = space_containing(addr); | |
2995 if (sp != NULL) { | |
2996 return sp->block_start(addr); | |
2997 } | |
2998 return NULL; | |
2999 } | |
3000 | |
3001 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
3002 Space* sp = space_containing(addr); | |
3003 assert(sp != NULL, "block_size of address outside of heap"); | |
3004 return sp->block_size(addr); | |
3005 } | |
3006 | |
3007 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
3008 Space* sp = space_containing(addr); | |
3009 return sp->block_is_obj(addr); | |
3010 } | |
3011 | |
3012 bool G1CollectedHeap::supports_tlab_allocation() const { | |
3013 return true; | |
3014 } | |
3015 | |
3016 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
3017 return HeapRegion::GrainBytes; | |
3018 } | |
3019 | |
3020 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
3021 // Return the remaining space in the cur alloc region, but not less than | |
3022 // the min TLAB size. | |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3023 |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3024 // Also, this value can be at most the humongous object threshold, |
10405 | 3025 // since we can't allow tlabs to grow big enough to accommodate |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3026 // humongous objects. |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3027 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3028 HeapRegion* hr = _mutator_alloc_region.get(); |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3029 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3030 if (hr == NULL) { |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3031 return max_tlab_size; |
342 | 3032 } else { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3033 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 3034 } |
3035 } | |
3036 | |
3037 size_t G1CollectedHeap::max_capacity() const { | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3038 return _g1_reserved.byte_size(); |
342 | 3039 } |
3040 | |
3041 jlong G1CollectedHeap::millis_since_last_gc() { | |
3042 // assert(false, "NYI"); | |
3043 return 0; | |
3044 } | |
3045 | |
3046 void G1CollectedHeap::prepare_for_verify() { | |
3047 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
3048 ensure_parsability(false); | |
3049 } | |
3050 g1_rem_set()->prepare_for_verify(); | |
3051 } | |
3052 | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3053 bool G1CollectedHeap::allocated_since_marking(oop obj, HeapRegion* hr, |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3054 VerifyOption vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3055 switch (vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3056 case VerifyOption_G1UsePrevMarking: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3057 return hr->obj_allocated_since_prev_marking(obj); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3058 case VerifyOption_G1UseNextMarking: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3059 return hr->obj_allocated_since_next_marking(obj); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3060 case VerifyOption_G1UseMarkWord: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3061 return false; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3062 default: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3063 ShouldNotReachHere(); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3064 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3065 return false; // keep some compilers happy |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3066 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3067 |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3068 HeapWord* G1CollectedHeap::top_at_mark_start(HeapRegion* hr, VerifyOption vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3069 switch (vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3070 case VerifyOption_G1UsePrevMarking: return hr->prev_top_at_mark_start(); |
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3071 case VerifyOption_G1UseNextMarking: return hr->next_top_at_mark_start(); |
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3072 case VerifyOption_G1UseMarkWord: return NULL; |
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3073 default: ShouldNotReachHere(); |
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3074 } |
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3075 return NULL; // keep some compilers happy |
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3076 } |
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3077 |
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3078 bool G1CollectedHeap::is_marked(oop obj, VerifyOption vo) { |
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3079 switch (vo) { |
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3080 case VerifyOption_G1UsePrevMarking: return isMarkedPrev(obj); |
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3081 case VerifyOption_G1UseNextMarking: return isMarkedNext(obj); |
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3082 case VerifyOption_G1UseMarkWord: return obj->is_gc_marked(); |
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3083 default: ShouldNotReachHere(); |
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3084 } |
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3085 return false; // keep some compilers happy |
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3086 } |
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3087 |
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3088 const char* G1CollectedHeap::top_at_mark_start_str(VerifyOption vo) { |
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3089 switch (vo) { |
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3090 case VerifyOption_G1UsePrevMarking: return "PTAMS"; |
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3091 case VerifyOption_G1UseNextMarking: return "NTAMS"; |
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3092 case VerifyOption_G1UseMarkWord: return "NONE"; |
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3093 default: ShouldNotReachHere(); |
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3094 } |
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3095 return NULL; // keep some compilers happy |
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3096 } |
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3097 |
12080 | 3098 // TODO: VerifyRootsClosure extends OopsInGenClosure so that we can |
3099 // pass it as the perm_blk to SharedHeap::process_strong_roots. | |
3100 // When process_strong_roots stop calling perm_blk->younger_refs_iterate | |
3101 // we can change this closure to extend the simpler OopClosure. | |
3102 class VerifyRootsClosure: public OopsInGenClosure { | |
3103 private: | |
3104 G1CollectedHeap* _g1h; | |
3105 VerifyOption _vo; | |
3106 bool _failures; | |
3107 public: | |
3108 // _vo == UsePrevMarking -> use "prev" marking information, | |
3109 // _vo == UseNextMarking -> use "next" marking information, | |
3110 // _vo == UseMarkWord -> use mark word from object header. | |
3111 VerifyRootsClosure(VerifyOption vo) : | |
3112 _g1h(G1CollectedHeap::heap()), | |
3113 _vo(vo), | |
3114 _failures(false) { } | |
3115 | |
3116 bool failures() { return _failures; } | |
3117 | |
3118 template <class T> void do_oop_nv(T* p) { | |
3119 T heap_oop = oopDesc::load_heap_oop(p); | |
3120 if (!oopDesc::is_null(heap_oop)) { | |
3121 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
3122 if (_g1h->is_obj_dead_cond(obj, _vo)) { | |
3123 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " | |
3124 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
3125 if (_vo == VerifyOption_G1UseMarkWord) { | |
3126 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); | |
3127 } | |
3128 obj->print_on(gclog_or_tty); | |
3129 _failures = true; | |
3130 } | |
3131 } | |
3132 } | |
3133 | |
3134 void do_oop(oop* p) { do_oop_nv(p); } | |
3135 void do_oop(narrowOop* p) { do_oop_nv(p); } | |
3136 }; | |
3137 | |
3138 class G1VerifyCodeRootOopClosure: public OopsInGenClosure { | |
3139 G1CollectedHeap* _g1h; | |
3140 OopClosure* _root_cl; | |
3141 nmethod* _nm; | |
3142 VerifyOption _vo; | |
3143 bool _failures; | |
3144 | |
3145 template <class T> void do_oop_work(T* p) { | |
3146 // First verify that this root is live | |
3147 _root_cl->do_oop(p); | |
3148 | |
3149 if (!G1VerifyHeapRegionCodeRoots) { | |
3150 // We're not verifying the code roots attached to heap region. | |
3151 return; | |
3152 } | |
3153 | |
3154 // Don't check the code roots during marking verification in a full GC | |
3155 if (_vo == VerifyOption_G1UseMarkWord) { | |
3156 return; | |
3157 } | |
3158 | |
3159 // Now verify that the current nmethod (which contains p) is | |
3160 // in the code root list of the heap region containing the | |
3161 // object referenced by p. | |
3162 | |
3163 T heap_oop = oopDesc::load_heap_oop(p); | |
3164 if (!oopDesc::is_null(heap_oop)) { | |
3165 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
3166 | |
3167 // Now fetch the region containing the object | |
3168 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
3169 HeapRegionRemSet* hrrs = hr->rem_set(); | |
3170 // Verify that the strong code root list for this region | |
3171 // contains the nmethod | |
3172 if (!hrrs->strong_code_roots_list_contains(_nm)) { | |
3173 gclog_or_tty->print_cr("Code root location "PTR_FORMAT" " | |
3174 "from nmethod "PTR_FORMAT" not in strong " | |
3175 "code roots for region ["PTR_FORMAT","PTR_FORMAT")", | |
3176 p, _nm, hr->bottom(), hr->end()); | |
3177 _failures = true; | |
3178 } | |
3179 } | |
3180 } | |
3181 | |
3182 public: | |
3183 G1VerifyCodeRootOopClosure(G1CollectedHeap* g1h, OopClosure* root_cl, VerifyOption vo): | |
3184 _g1h(g1h), _root_cl(root_cl), _vo(vo), _nm(NULL), _failures(false) {} | |
3185 | |
3186 void do_oop(oop* p) { do_oop_work(p); } | |
3187 void do_oop(narrowOop* p) { do_oop_work(p); } | |
3188 | |
3189 void set_nmethod(nmethod* nm) { _nm = nm; } | |
3190 bool failures() { return _failures; } | |
3191 }; | |
3192 | |
3193 class G1VerifyCodeRootBlobClosure: public CodeBlobClosure { | |
3194 G1VerifyCodeRootOopClosure* _oop_cl; | |
3195 | |
3196 public: | |
3197 G1VerifyCodeRootBlobClosure(G1VerifyCodeRootOopClosure* oop_cl): | |
3198 _oop_cl(oop_cl) {} | |
3199 | |
3200 void do_code_blob(CodeBlob* cb) { | |
3201 nmethod* nm = cb->as_nmethod_or_null(); | |
3202 if (nm != NULL) { | |
3203 _oop_cl->set_nmethod(nm); | |
3204 nm->oops_do(_oop_cl); | |
3205 } | |
3206 } | |
3207 }; | |
3208 | |
3209 class YoungRefCounterClosure : public OopClosure { | |
3210 G1CollectedHeap* _g1h; | |
3211 int _count; | |
3212 public: | |
3213 YoungRefCounterClosure(G1CollectedHeap* g1h) : _g1h(g1h), _count(0) {} | |
3214 void do_oop(oop* p) { if (_g1h->is_in_young(*p)) { _count++; } } | |
3215 void do_oop(narrowOop* p) { ShouldNotReachHere(); } | |
3216 | |
3217 int count() { return _count; } | |
3218 void reset_count() { _count = 0; }; | |
3219 }; | |
3220 | |
3221 class VerifyKlassClosure: public KlassClosure { | |
3222 YoungRefCounterClosure _young_ref_counter_closure; | |
3223 OopClosure *_oop_closure; | |
3224 public: | |
3225 VerifyKlassClosure(G1CollectedHeap* g1h, OopClosure* cl) : _young_ref_counter_closure(g1h), _oop_closure(cl) {} | |
3226 void do_klass(Klass* k) { | |
3227 k->oops_do(_oop_closure); | |
3228 | |
3229 _young_ref_counter_closure.reset_count(); | |
3230 k->oops_do(&_young_ref_counter_closure); | |
3231 if (_young_ref_counter_closure.count() > 0) { | |
3232 guarantee(k->has_modified_oops(), err_msg("Klass %p, has young refs but is not dirty.", k)); | |
3233 } | |
3234 } | |
3235 }; | |
3236 | |
342 | 3237 class VerifyLivenessOopClosure: public OopClosure { |
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3238 G1CollectedHeap* _g1h; |
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3239 VerifyOption _vo; |
342 | 3240 public: |
3772
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3241 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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3242 _g1h(g1h), _vo(vo) |
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3243 { } |
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3244 void do_oop(narrowOop *p) { do_oop_work(p); } |
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3245 void do_oop( oop *p) { do_oop_work(p); } |
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3246 |
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3247 template <class T> void do_oop_work(T *p) { |
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3248 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
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3249 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
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3250 "Dead object referenced by a not dead object"); |
342 | 3251 } |
3252 }; | |
3253 | |
3254 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 3255 private: |
342 | 3256 G1CollectedHeap* _g1h; |
3257 size_t _live_bytes; | |
3258 HeapRegion *_hr; | |
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3259 VerifyOption _vo; |
342 | 3260 public: |
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3261 // _vo == UsePrevMarking -> use "prev" marking information, |
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3262 // _vo == UseNextMarking -> use "next" marking information, |
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3263 // _vo == UseMarkWord -> use mark word from object header. |
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3264 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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3265 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 3266 _g1h = G1CollectedHeap::heap(); |
3267 } | |
3268 void do_object(oop o) { | |
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3269 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 3270 assert(o != NULL, "Huh?"); |
3772
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3271 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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3272 // If the object is alive according to the mark word, |
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3273 // then verify that the marking information agrees. |
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3274 // Note we can't verify the contra-positive of the |
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3275 // above: if the object is dead (according to the mark |
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3276 // word), it may not be marked, or may have been marked |
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3277 // but has since became dead, or may have been allocated |
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3278 // since the last marking. |
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3279 if (_vo == VerifyOption_G1UseMarkWord) { |
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3280 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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3281 } |
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|
3282 |
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|
3283 o->oop_iterate_no_header(&isLive); |
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3284 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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3285 size_t obj_size = o->size(); // Make sure we don't overflow |
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3286 _live_bytes += (obj_size * HeapWordSize); |
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3287 } |
342 | 3288 } |
3289 } | |
3290 size_t live_bytes() { return _live_bytes; } | |
3291 }; | |
3292 | |
3293 class PrintObjsInRegionClosure : public ObjectClosure { | |
3294 HeapRegion *_hr; | |
3295 G1CollectedHeap *_g1; | |
3296 public: | |
3297 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
3298 _g1 = G1CollectedHeap::heap(); | |
3299 }; | |
3300 | |
3301 void do_object(oop o) { | |
3302 if (o != NULL) { | |
3303 HeapWord *start = (HeapWord *) o; | |
3304 size_t word_sz = o->size(); | |
3305 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
3306 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
3307 (void*) o, word_sz, | |
3308 _g1->isMarkedPrev(o), | |
3309 _g1->isMarkedNext(o), | |
3310 _hr->obj_allocated_since_prev_marking(o)); | |
3311 HeapWord *end = start + word_sz; | |
3312 HeapWord *cur; | |
3313 int *val; | |
3314 for (cur = start; cur < end; cur++) { | |
3315 val = (int *) cur; | |
3316 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
3317 } | |
3318 } | |
3319 } | |
3320 }; | |
3321 | |
3322 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 3323 private: |
6254
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3324 bool _par; |
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3325 VerifyOption _vo; |
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3326 bool _failures; |
811 | 3327 public: |
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3328 // _vo == UsePrevMarking -> use "prev" marking information, |
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3329 // _vo == UseNextMarking -> use "next" marking information, |
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3330 // _vo == UseMarkWord -> use mark word from object header. |
6008 | 3331 VerifyRegionClosure(bool par, VerifyOption vo) |
3332 : _par(par), | |
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3333 _vo(vo), |
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3334 _failures(false) {} |
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3335 |
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|
3336 bool failures() { |
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3337 return _failures; |
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3338 } |
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3339 |
342 | 3340 bool doHeapRegion(HeapRegion* r) { |
637
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3341 if (!r->continuesHumongous()) { |
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|
3342 bool failures = false; |
6008 | 3343 r->verify(_vo, &failures); |
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|
3344 if (failures) { |
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|
3345 _failures = true; |
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|
3346 } else { |
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|
3347 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
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3348 r->object_iterate(¬_dead_yet_cl); |
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|
3349 if (_vo != VerifyOption_G1UseNextMarking) { |
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3350 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
3351 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
2ace1c4ee8da
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|
3352 "max_live_bytes "SIZE_FORMAT" " |
2ace1c4ee8da
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|
3353 "< calculated "SIZE_FORMAT, |
2ace1c4ee8da
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|
3354 r->bottom(), r->end(), |
2ace1c4ee8da
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|
3355 r->max_live_bytes(), |
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|
3356 not_dead_yet_cl.live_bytes()); |
4787
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|
3357 _failures = true; |
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|
3358 } |
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|
3359 } else { |
2ace1c4ee8da
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|
3360 // When vo == UseNextMarking we cannot currently do a sanity |
2ace1c4ee8da
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|
3361 // check on the live bytes as the calculation has not been |
2ace1c4ee8da
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|
3362 // finalized yet. |
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|
3363 } |
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|
3364 } |
342 | 3365 } |
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|
3366 return false; // stop the region iteration if we hit a failure |
342 | 3367 } |
3368 }; | |
3369 | |
12080 | 3370 // This is the task used for parallel verification of the heap regions |
390 | 3371 |
3372 class G1ParVerifyTask: public AbstractGangTask { | |
3373 private: | |
3374 G1CollectedHeap* _g1h; | |
3772
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3375 VerifyOption _vo; |
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|
3376 bool _failures; |
390 | 3377 |
3378 public: | |
3772
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|
3379 // _vo == UsePrevMarking -> use "prev" marking information, |
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3380 // _vo == UseNextMarking -> use "next" marking information, |
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3381 // _vo == UseMarkWord -> use mark word from object header. |
6008 | 3382 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) : |
390 | 3383 AbstractGangTask("Parallel verify task"), |
845
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3384 _g1h(g1h), |
3772
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|
3385 _vo(vo), |
1020
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|
3386 _failures(false) { } |
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|
3387 |
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|
3388 bool failures() { |
ff2402f6a50b
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|
3389 return _failures; |
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|
3390 } |
390 | 3391 |
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diff
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|
3392 void work(uint worker_id) { |
637
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|
3393 HandleMark hm; |
6008 | 3394 VerifyRegionClosure blk(true, _vo); |
4728
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|
3395 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
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|
3396 _g1h->workers()->active_workers(), |
390 | 3397 HeapRegion::ParVerifyClaimValue); |
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|
3398 if (blk.failures()) { |
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|
3399 _failures = true; |
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|
3400 } |
390 | 3401 } |
3402 }; | |
3403 | |
12080 | 3404 void G1CollectedHeap::verify(bool silent, VerifyOption vo) { |
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8010463: G1: Crashes with -UseTLAB and heap verification
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diff
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|
3405 if (SafepointSynchronize::is_at_safepoint()) { |
12080 | 3406 assert(Thread::current()->is_VM_thread(), |
3407 "Expected to be executed serially by the VM thread at this point"); | |
3408 | |
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|
3409 if (!silent) { gclog_or_tty->print("Roots "); } |
3772
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|
3410 VerifyRootsClosure rootsCl(vo); |
12080 | 3411 G1VerifyCodeRootOopClosure codeRootsCl(this, &rootsCl, vo); |
3412 G1VerifyCodeRootBlobClosure blobsCl(&codeRootsCl); | |
6725
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|
3413 VerifyKlassClosure klassCl(this, &rootsCl); |
3772
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diff
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|
3414 |
3293
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
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|
3415 // We apply the relevant closures to all the oops in the |
1f4413413144
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diff
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|
3416 // system dictionary, the string table and the code cache. |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
3417 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
3772
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|
3418 |
6725
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|
3419 // Need cleared claim bits for the strong roots processing |
da91efe96a93
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|
3420 ClassLoaderDataGraph::clear_claimed_marks(); |
da91efe96a93
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diff
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|
3421 |
3293
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diff
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|
3422 process_strong_roots(true, // activate StrongRootsScope |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
3423 false, // we set "is scavenging" to false, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
3424 // so we don't reset the dirty cards. |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
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|
3425 ScanningOption(so), // roots scanning options |
342 | 3426 &rootsCl, |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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diff
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|
3427 &blobsCl, |
6725
da91efe96a93
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|
3428 &klassCl |
da91efe96a93
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|
3429 ); |
da91efe96a93
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|
3430 |
12080 | 3431 bool failures = rootsCl.failures() || codeRootsCl.failures(); |
3772
6747fd0512e0
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|
3432 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
3433 if (vo != VerifyOption_G1UseMarkWord) { |
6747fd0512e0
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diff
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|
3434 // If we're verifying during a full GC then the region sets |
6747fd0512e0
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diff
changeset
|
3435 // will have been torn down at the start of the GC. Therefore |
6747fd0512e0
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diff
changeset
|
3436 // verifying the region sets will fail. So we only verify |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3437 // the region sets when not in a full GC. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
3438 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3439 verify_region_sets(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3440 } |
6747fd0512e0
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diff
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|
3441 |
2152 | 3442 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3443 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3444 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3445 "sanity check"); | |
3446 | |
6008 | 3447 G1ParVerifyTask task(this, vo); |
4095
bca17e38de00
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diff
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|
3448 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
3449 workers()->active_workers() == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
3450 "If not dynamic should be using all the workers"); |
bca17e38de00
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diff
changeset
|
3451 int n_workers = workers()->active_workers(); |
390 | 3452 set_par_threads(n_workers); |
3453 workers()->run_task(&task); | |
3454 set_par_threads(0); | |
1020
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diff
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|
3455 if (task.failures()) { |
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parents:
1019
diff
changeset
|
3456 failures = true; |
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diff
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|
3457 } |
390 | 3458 |
4095
bca17e38de00
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diff
changeset
|
3459 // Checks that the expected amount of parallel work was done. |
bca17e38de00
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4090
diff
changeset
|
3460 // The implication is that n_workers is > 0. |
390 | 3461 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3462 "sanity check"); | |
3463 | |
3464 reset_heap_region_claim_values(); | |
3465 | |
3466 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3467 "sanity check"); | |
3468 } else { | |
6008 | 3469 VerifyRegionClosure blk(false, vo); |
3766 | 3470 heap_region_iterate(&blk); |
1020
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diff
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|
3471 if (blk.failures()) { |
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1019
diff
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|
3472 failures = true; |
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diff
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|
3473 } |
390 | 3474 } |
2152 | 3475 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3476 rem_set()->verify(); |
1020
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|
3477 |
ff2402f6a50b
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1019
diff
changeset
|
3478 if (failures) { |
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diff
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|
3479 gclog_or_tty->print_cr("Heap:"); |
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3480 // It helps to have the per-region information in the output to |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3481 // help us track down what went wrong. This is why we call |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3482 // print_extended_on() instead of print_on(). |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3483 print_extended_on(gclog_or_tty); |
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|
3484 gclog_or_tty->print_cr(""); |
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1545
diff
changeset
|
3485 #ifndef PRODUCT |
1044 | 3486 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3487 concurrent_mark()->print_reachable("at-verification-failure", |
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|
3488 vo, false /* all */); |
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diff
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|
3489 } |
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1545
diff
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|
3490 #endif |
1020
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diff
changeset
|
3491 gclog_or_tty->flush(); |
ff2402f6a50b
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1019
diff
changeset
|
3492 } |
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diff
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|
3493 guarantee(!failures, "there should not have been any failures"); |
342 | 3494 } else { |
8855
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
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diff
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|
3495 if (!silent) |
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diff
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|
3496 gclog_or_tty->print("(SKIPPING roots, heapRegionSets, heapRegions, remset) "); |
342 | 3497 } |
3498 } | |
3499 | |
12080 | 3500 void G1CollectedHeap::verify(bool silent) { |
3501 verify(silent, VerifyOption_G1UsePrevMarking); | |
3502 } | |
3503 | |
3504 double G1CollectedHeap::verify(bool guard, const char* msg) { | |
3505 double verify_time_ms = 0.0; | |
3506 | |
3507 if (guard && total_collections() >= VerifyGCStartAt) { | |
3508 double verify_start = os::elapsedTime(); | |
3509 HandleMark hm; // Discard invalid handles created during verification | |
3510 prepare_for_verify(); | |
3511 Universe::verify(VerifyOption_G1UsePrevMarking, msg); | |
3512 verify_time_ms = (os::elapsedTime() - verify_start) * 1000; | |
3513 } | |
3514 | |
3515 return verify_time_ms; | |
3516 } | |
3517 | |
3518 void G1CollectedHeap::verify_before_gc() { | |
3519 double verify_time_ms = verify(VerifyBeforeGC, " VerifyBeforeGC:"); | |
3520 g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms); | |
3521 } | |
3522 | |
3523 void G1CollectedHeap::verify_after_gc() { | |
3524 double verify_time_ms = verify(VerifyAfterGC, " VerifyAfterGC:"); | |
3525 g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms); | |
3526 } | |
3527 | |
342 | 3528 class PrintRegionClosure: public HeapRegionClosure { |
3529 outputStream* _st; | |
3530 public: | |
3531 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3532 bool doHeapRegion(HeapRegion* r) { | |
3533 r->print_on(_st); | |
3534 return false; | |
3535 } | |
3536 }; | |
3537 | |
3538 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3539 st->print(" %-20s", "garbage-first heap"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3540 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
3541 capacity()/K, used_unlocked()/K); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3542 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3543 _g1_storage.low_boundary(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3544 _g1_storage.high(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3545 _g1_storage.high_boundary()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3546 st->cr(); |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3547 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3548 uint young_regions = _young_list->length(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3549 st->print("%u young (" SIZE_FORMAT "K), ", young_regions, |
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7157073: G1: type change size_t -> uint for region counts / indexes
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parents:
6008
diff
changeset
|
3550 (size_t) young_regions * HeapRegion::GrainBytes / K); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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parents:
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diff
changeset
|
3551 uint survivor_regions = g1_policy()->recorded_survivor_regions(); |
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7157073: G1: type change size_t -> uint for region counts / indexes
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parents:
6008
diff
changeset
|
3552 st->print("%u survivors (" SIZE_FORMAT "K)", survivor_regions, |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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parents:
6008
diff
changeset
|
3553 (size_t) survivor_regions * HeapRegion::GrainBytes / K); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3554 st->cr(); |
6863
04155d9c8c76
8000358: G1: metaspace information not printed in PrintHeapAtGC output nor in hs_err file
johnc
parents:
6819
diff
changeset
|
3555 MetaspaceAux::print_on(st); |
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3556 } |
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
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diff
changeset
|
3557 |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3558 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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parents:
4072
diff
changeset
|
3559 print_on(st); |
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
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diff
changeset
|
3560 |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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parents:
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diff
changeset
|
3561 // Print the per-region information. |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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parents:
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diff
changeset
|
3562 st->cr(); |
6010
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tonyp
parents:
6008
diff
changeset
|
3563 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), " |
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7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
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diff
changeset
|
3564 "HS=humongous(starts), HC=humongous(continues), " |
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tonyp
parents:
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diff
changeset
|
3565 "CS=collection set, F=free, TS=gc time stamp, " |
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7157073: G1: type change size_t -> uint for region counts / indexes
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parents:
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diff
changeset
|
3566 "PTAMS=previous top-at-mark-start, " |
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parents:
6008
diff
changeset
|
3567 "NTAMS=next top-at-mark-start)"); |
342 | 3568 PrintRegionClosure blk(st); |
3766 | 3569 heap_region_iterate(&blk); |
342 | 3570 } |
3571 | |
9076
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8855
diff
changeset
|
3572 void G1CollectedHeap::print_on_error(outputStream* st) const { |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8855
diff
changeset
|
3573 this->CollectedHeap::print_on_error(st); |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8855
diff
changeset
|
3574 |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8855
diff
changeset
|
3575 if (_cm != NULL) { |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8855
diff
changeset
|
3576 st->cr(); |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
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parents:
8855
diff
changeset
|
3577 _cm->print_on_error(st); |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8855
diff
changeset
|
3578 } |
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8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8855
diff
changeset
|
3579 } |
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
8855
diff
changeset
|
3580 |
342 | 3581 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3582 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3583 workers()->print_worker_threads_on(st); |
3584 } | |
3585 _cmThread->print_on(st); | |
342 | 3586 st->cr(); |
1019 | 3587 _cm->print_worker_threads_on(st); |
3588 _cg1r->print_worker_threads_on(st); | |
342 | 3589 } |
3590 | |
3591 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3592 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3593 workers()->threads_do(tc); |
3594 } | |
3595 tc->do_thread(_cmThread); | |
794 | 3596 _cg1r->threads_do(tc); |
342 | 3597 } |
3598 | |
3599 void G1CollectedHeap::print_tracing_info() const { | |
3600 // We'll overload this to mean "trace GC pause statistics." | |
3601 if (TraceGen0Time || TraceGen1Time) { | |
3602 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3603 // to that. | |
3604 g1_policy()->print_tracing_info(); | |
3605 } | |
751 | 3606 if (G1SummarizeRSetStats) { |
342 | 3607 g1_rem_set()->print_summary_info(); |
3608 } | |
1282 | 3609 if (G1SummarizeConcMark) { |
342 | 3610 concurrent_mark()->print_summary_info(); |
3611 } | |
3612 g1_policy()->print_yg_surv_rate_info(); | |
3613 SpecializationStats::print(); | |
3614 } | |
3615 | |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3616 #ifndef PRODUCT |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3617 // Helpful for debugging RSet issues. |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3618 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
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diff
changeset
|
3619 class PrintRSetsClosure : public HeapRegionClosure { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3620 private: |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3621 const char* _msg; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3622 size_t _occupied_sum; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3623 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3624 public: |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3625 bool doHeapRegion(HeapRegion* r) { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3626 HeapRegionRemSet* hrrs = r->rem_set(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3627 size_t occupied = hrrs->occupied(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3628 _occupied_sum += occupied; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3629 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3630 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3631 HR_FORMAT_PARAMS(r)); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3632 if (occupied == 0) { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3633 gclog_or_tty->print_cr(" RSet is empty"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3634 } else { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3635 hrrs->print(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3636 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3637 gclog_or_tty->print_cr("----------"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3638 return false; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3639 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3640 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3641 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3642 gclog_or_tty->cr(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3643 gclog_or_tty->print_cr("========================================"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3644 gclog_or_tty->print_cr(msg); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3645 gclog_or_tty->cr(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3646 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3647 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3648 ~PrintRSetsClosure() { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3649 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3650 gclog_or_tty->print_cr("========================================"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3651 gclog_or_tty->cr(); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3652 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3653 }; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3654 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3655 void G1CollectedHeap::print_cset_rsets() { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3656 PrintRSetsClosure cl("Printing CSet RSets"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3657 collection_set_iterate(&cl); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3658 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3659 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3660 void G1CollectedHeap::print_all_rsets() { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3661 PrintRSetsClosure cl("Printing All RSets");; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3662 heap_region_iterate(&cl); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3663 } |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3664 #endif // PRODUCT |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3665 |
342 | 3666 G1CollectedHeap* G1CollectedHeap::heap() { |
3667 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3668 "not a garbage-first heap"); | |
3669 return _g1h; | |
3670 } | |
3671 | |
3672 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
ysr
parents:
1166
diff
changeset
|
3673 // always_do_update_barrier = false; |
342 | 3674 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3675 // Fill TLAB's and such | |
3676 ensure_parsability(true); | |
12339
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3677 |
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3678 if (G1SummarizeRSetStats && (G1SummarizeRSetStatsPeriod > 0) && |
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3679 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3680 g1_rem_set()->print_periodic_summary_info("Before GC RS summary"); |
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3681 } |
342 | 3682 } |
3683 | |
3684 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
10372
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3685 |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3686 if (G1SummarizeRSetStats && |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3687 (G1SummarizeRSetStatsPeriod > 0) && |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3688 // we are at the end of the GC. Total collections has already been increased. |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3689 ((total_collections() - 1) % G1SummarizeRSetStatsPeriod == 0)) { |
12339
c319b188c7b2
8014078: G1: improve remembered set summary information by providing per region type information
tschatzl
parents:
12305
diff
changeset
|
3690 g1_rem_set()->print_periodic_summary_info("After GC RS summary"); |
10372
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3691 } |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents:
10327
diff
changeset
|
3692 |
342 | 3693 // FIXME: what is this about? |
3694 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3695 // is set. | |
3696 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3697 "derived pointer present")); | |
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
ysr
parents:
1166
diff
changeset
|
3698 // always_do_update_barrier = true; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 // We have just completed a GC. Update the soft reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3701 // policy with the new heap occupancy |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 Universe::update_heap_info_at_gc(); |
342 | 3703 } |
3704 | |
1973 | 3705 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3706 unsigned int gc_count_before, | |
12113
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12082
diff
changeset
|
3707 bool* succeeded, |
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12082
diff
changeset
|
3708 GCCause::Cause gc_cause) { |
1973 | 3709 assert_heap_not_locked_and_not_at_safepoint(); |
342 | 3710 g1_policy()->record_stop_world_start(); |
1973 | 3711 VM_G1IncCollectionPause op(gc_count_before, |
3712 word_size, | |
3713 false, /* should_initiate_conc_mark */ | |
3714 g1_policy()->max_pause_time_ms(), | |
12113
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12082
diff
changeset
|
3715 gc_cause); |
1973 | 3716 VMThread::execute(&op); |
3717 | |
3718 HeapWord* result = op.result(); | |
3719 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3720 assert(result == NULL || ret_succeeded, | |
3721 "the result should be NULL if the VM did not succeed"); | |
3722 *succeeded = ret_succeeded; | |
3723 | |
3724 assert_heap_not_locked(); | |
3725 return result; | |
342 | 3726 } |
3727 | |
3728 void | |
3729 G1CollectedHeap::doConcurrentMark() { | |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3730 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3731 if (!_cmThread->in_progress()) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3732 _cmThread->set_started(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3733 CGC_lock->notify(); |
342 | 3734 } |
3735 } | |
3736 | |
3737 size_t G1CollectedHeap::pending_card_num() { | |
3738 size_t extra_cards = 0; | |
3739 JavaThread *curr = Threads::first(); | |
3740 while (curr != NULL) { | |
3741 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3742 extra_cards += dcq.size(); | |
3743 curr = curr->next(); | |
3744 } | |
3745 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3746 size_t buffer_size = dcqs.buffer_size(); | |
3747 size_t buffer_num = dcqs.completed_buffers_num(); | |
6611 | 3748 |
3749 // PtrQueueSet::buffer_size() and PtrQueue:size() return sizes | |
3750 // in bytes - not the number of 'entries'. We need to convert | |
3751 // into a number of cards. | |
3752 return (buffer_size * buffer_num + extra_cards) / oopSize; | |
342 | 3753 } |
3754 | |
3755 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3756 return g1_rem_set()->cardsScanned(); |
342 | 3757 } |
3758 | |
3759 void | |
3760 G1CollectedHeap::setup_surviving_young_words() { | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3761 assert(_surviving_young_words == NULL, "pre-condition"); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3762 uint array_length = g1_policy()->young_cset_region_length(); |
6197 | 3763 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, (size_t) array_length, mtGC); |
342 | 3764 if (_surviving_young_words == NULL) { |
10161
746b070f5022
8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
ccheung
parents:
10099
diff
changeset
|
3765 vm_exit_out_of_memory(sizeof(size_t) * array_length, OOM_MALLOC_ERROR, |
342 | 3766 "Not enough space for young surv words summary."); |
3767 } | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3768 memset(_surviving_young_words, 0, (size_t) array_length * sizeof(size_t)); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3769 #ifdef ASSERT |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3770 for (uint i = 0; i < array_length; ++i) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3771 assert( _surviving_young_words[i] == 0, "memset above" ); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3772 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3773 #endif // !ASSERT |
342 | 3774 } |
3775 | |
3776 void | |
3777 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3778 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3779 uint array_length = g1_policy()->young_cset_region_length(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3780 for (uint i = 0; i < array_length; ++i) { |
342 | 3781 _surviving_young_words[i] += surv_young_words[i]; |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3782 } |
342 | 3783 } |
3784 | |
3785 void | |
3786 G1CollectedHeap::cleanup_surviving_young_words() { | |
3787 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
6197 | 3788 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words, mtGC); |
342 | 3789 _surviving_young_words = NULL; |
3790 } | |
3791 | |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3792 #ifdef ASSERT |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3793 class VerifyCSetClosure: public HeapRegionClosure { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3794 public: |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3795 bool doHeapRegion(HeapRegion* hr) { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3796 // Here we check that the CSet region's RSet is ready for parallel |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3797 // iteration. The fields that we'll verify are only manipulated |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3798 // when the region is part of a CSet and is collected. Afterwards, |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3799 // we reset these fields when we clear the region's RSet (when the |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3800 // region is freed) so they are ready when the region is |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3801 // re-allocated. The only exception to this is if there's an |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3802 // evacuation failure and instead of freeing the region we leave |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3803 // it in the heap. In that case, we reset these fields during |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3804 // evacuation failure handling. |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3805 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3806 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3807 // Here's a good place to add any other checks we'd like to |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3808 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3809 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3810 } |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3811 }; |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3812 #endif // ASSERT |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3813 |
1709 | 3814 #if TASKQUEUE_STATS |
3815 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3816 st->print_raw_cr("GC Task Stats"); | |
3817 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3818 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3819 } | |
3820 | |
3821 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3822 print_taskqueue_stats_hdr(st); | |
3823 | |
3824 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3825 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3826 for (int i = 0; i < n; ++i) { |
3827 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3828 totals += task_queue(i)->stats; | |
3829 } | |
3830 st->print_raw("tot "); totals.print(st); st->cr(); | |
3831 | |
3832 DEBUG_ONLY(totals.verify()); | |
3833 } | |
3834 | |
3835 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3836 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3837 for (int i = 0; i < n; ++i) { |
3838 task_queue(i)->stats.reset(); | |
3839 } | |
3840 } | |
3841 #endif // TASKQUEUE_STATS | |
3842 | |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3843 void G1CollectedHeap::log_gc_header() { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3844 if (!G1Log::fine()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3845 return; |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3846 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3847 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3848 gclog_or_tty->date_stamp(PrintGCDateStamps); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3849 gclog_or_tty->stamp(PrintGCTimeStamps); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3850 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3851 GCCauseString gc_cause_str = GCCauseString("GC pause", gc_cause()) |
7455
0b54ffe4c2d3
8005672: Clean up some changes to GC logging with GCCause's
jmasa
parents:
7397
diff
changeset
|
3852 .append(g1_policy()->gcs_are_young() ? "(young)" : "(mixed)") |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3853 .append(g1_policy()->during_initial_mark_pause() ? " (initial-mark)" : ""); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3854 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3855 gclog_or_tty->print("[%s", (const char*)gc_cause_str); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3856 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3857 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3858 void G1CollectedHeap::log_gc_footer(double pause_time_sec) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3859 if (!G1Log::fine()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3860 return; |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3861 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3862 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3863 if (G1Log::finer()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3864 if (evacuation_failed()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3865 gclog_or_tty->print(" (to-space exhausted)"); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3866 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3867 gclog_or_tty->print_cr(", %3.7f secs]", pause_time_sec); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3868 g1_policy()->phase_times()->note_gc_end(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3869 g1_policy()->phase_times()->print(pause_time_sec); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3870 g1_policy()->print_detailed_heap_transition(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3871 } else { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3872 if (evacuation_failed()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3873 gclog_or_tty->print("--"); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3874 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3875 g1_policy()->print_heap_transition(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3876 gclog_or_tty->print_cr(", %3.7f secs]", pause_time_sec); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3877 } |
7207
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
3878 gclog_or_tty->flush(); |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3879 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3880 |
1973 | 3881 bool |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3882 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3883 assert_at_safepoint(true /* should_be_vm_thread */); |
3884 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3885 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3886 if (GC_locker::check_active_before_gc()) { |
1973 | 3887 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3888 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3889 |
10405 | 3890 _gc_timer_stw->register_gc_start(os::elapsed_counter()); |
3891 | |
3892 _gc_tracer_stw->report_gc_start(gc_cause(), _gc_timer_stw->gc_start()); | |
3893 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3894 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3895 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3896 |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3897 print_heap_before_gc(); |
10405 | 3898 trace_heap_before_gc(_gc_tracer_stw); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3899 |
4072 | 3900 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3901 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3902 verify_dirty_young_regions(); |
2152 | 3903 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3904 // This call will decide whether this pause is an initial-mark |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3905 // pause. If it is, during_initial_mark_pause() will return true |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3906 // for the duration of this pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3907 g1_policy()->decide_on_conc_mark_initiation(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3908 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3909 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3910 assert(!g1_policy()->during_initial_mark_pause() || |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3911 g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3912 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3913 // We also do not allow mixed GCs during marking. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3914 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3915 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3916 // Record whether this pause is an initial mark. When the current |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3917 // thread has completed its logging output and it's safe to signal |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3918 // 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
|
3919 bool should_start_conc_mark = g1_policy()->during_initial_mark_pause(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3920 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3921 // Inner scope for scope based logging, timers, and stats collection |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3922 { |
10405 | 3923 EvacuationInfo evacuation_info; |
3924 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3925 if (g1_policy()->during_initial_mark_pause()) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3926 // 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
|
3927 // full collection counter. |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
3928 increment_old_marking_cycles_started(); |
10405 | 3929 register_concurrent_cycle_start(_gc_timer_stw->gc_start()); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3930 } |
10405 | 3931 |
3932 _gc_tracer_stw->report_yc_type(yc_type()); | |
3933 | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3934 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
6030 | 3935 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3936 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3937 workers()->active_workers() : 1); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
3938 double pause_start_sec = os::elapsedTime(); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
3939 g1_policy()->phase_times()->note_gc_start(active_workers); |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3940 log_gc_header(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3941 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3942 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3943 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3944 |
2361 | 3945 // If the secondary_free_list is not empty, append it to the |
3946 // free_list. No need to wait for the cleanup operation to finish; | |
3947 // the region allocation code will check the secondary_free_list | |
3948 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3949 // set, skip this step so that the region allocation code has to | |
3950 // get entries from the secondary_free_list. | |
2152 | 3951 if (!G1StressConcRegionFreeing) { |
2361 | 3952 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3953 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3954 |
12080 | 3955 assert(check_young_list_well_formed(), "young list should be well formed"); |
3956 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3957 "sanity check"); | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3958 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3959 // 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
|
3960 // 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
|
3961 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3962 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3963 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3964 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3965 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3966 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3967 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
|
3968 increment_gc_time_stamp(); |
342 | 3969 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
3970 verify_before_gc(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3971 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3972 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3973 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3974 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3975 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3976 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3977 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3978 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3979 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3980 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3981 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3982 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3983 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3984 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3985 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3986 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3987 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3988 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3989 // 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
|
3990 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3991 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3992 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3993 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3994 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3995 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3996 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3997 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3998 // This timing is only used by the ergonomics to handle our pause target. |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3999 // It is unclear why this should not include the full pause. We will |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4000 // investigate this in CR 7178365. |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4001 // |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4002 // Preserving the old comment here if that helps the investigation: |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4003 // |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4004 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4005 // the possible verification above. |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4006 double sample_start_time_sec = os::elapsedTime(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4007 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4008 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4009 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4010 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4011 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
|
4012 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4013 |
10098
71013d764f6e
8010780: G1: Eden occupancy/capacity output wrong after a full GC
johnc
parents:
8855
diff
changeset
|
4014 g1_policy()->record_collection_pause_start(sample_start_time_sec); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4015 |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4016 double scan_wait_start = os::elapsedTime(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4017 // 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
|
4018 // 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
|
4019 // 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
|
4020 // moving them during the GC. |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4021 bool waited = _cm->root_regions()->wait_until_scan_finished(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4022 double wait_time_ms = 0.0; |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4023 if (waited) { |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4024 double scan_wait_end = os::elapsedTime(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4025 wait_time_ms = (scan_wait_end - scan_wait_start) * 1000.0; |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4026 } |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4027 g1_policy()->phase_times()->record_root_region_scan_wait_time(wait_time_ms); |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4028 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4029 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4030 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4031 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4032 #endif // YOUNG_LIST_VERBOSE |
342 | 4033 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4034 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4035 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4036 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4037 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4038 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4039 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4040 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4041 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
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|
4042 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4043 |
10405 | 4044 g1_policy()->finalize_cset(target_pause_time_ms, evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4045 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4046 _cm->note_start_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4047 // 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
|
4048 // 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
|
4049 // 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
|
4050 // ensure that the CSet has been finalized. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4051 _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
|
4052 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4053 false /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4054 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4055 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4056 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4057 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4058 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4059 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4060 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4061 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4062 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4063 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4064 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4065 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4066 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4067 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4068 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4069 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4070 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4071 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
4072 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4073 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4074 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
4075 #endif // ASSERT |
1707 | 4076 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4077 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4078 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4079 // Initialize the GC alloc regions. |
10405 | 4080 init_gc_alloc_regions(evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4081 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4082 // Actually do the work... |
10405 | 4083 evacuate_collection_set(evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4084 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4085 // 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
|
4086 // (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
|
4087 // 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
|
4088 // 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
|
4089 // we checked. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4090 _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
|
4091 false /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4092 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4093 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4094 |
10405 | 4095 free_collection_set(g1_policy()->collection_set(), evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4096 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4097 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4098 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4099 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4100 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4101 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4102 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4103 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4104 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4105 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4106 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4107 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4108 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4109 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4110 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4111 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4112 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4113 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4114 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4115 "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
|
4116 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4117 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4118 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4119 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4120 #endif // YOUNG_LIST_VERBOSE |
342 | 4121 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4122 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
10405 | 4123 _young_list->first_survivor_region(), |
4124 _young_list->last_survivor_region()); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4125 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4126 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4127 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4128 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4129 _summary_bytes_used = recalculate_used(); |
10405 | 4130 uint n_queues = MAX2((int)ParallelGCThreads, 1); |
4131 for (uint i = 0; i < n_queues; i++) { | |
4132 if (_evacuation_failed_info_array[i].has_failed()) { | |
4133 _gc_tracer_stw->report_evacuation_failed(_evacuation_failed_info_array[i]); | |
4134 } | |
4135 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4136 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4137 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4138 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4139 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4140 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4141 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4142 if (g1_policy()->during_initial_mark_pause()) { |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4143 // 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
|
4144 // 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
|
4145 // appropriate initialization is done on the CM object. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4146 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4147 set_marking_started(); |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4148 // 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
|
4149 // 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
|
4150 // the current thread has completed its logging output. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4151 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4152 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4153 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
4154 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4155 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4156 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4157 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4158 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
|
4159 #endif // YOUNG_LIST_VERBOSE |
342 | 4160 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4161 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4162 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4163 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4164 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4165 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4166 size_t bytes_before = capacity(); |
4785 | 4167 // No need for an ergo verbose message here, |
4168 // expansion_amount() does this when it returns a value > 0. | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4169 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4170 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4171 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4172 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4173 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4174 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4175 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4176 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4177 |
10405 | 4178 // We redo the verification but now wrt to the new CSet which |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4179 // 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
|
4180 _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
|
4181 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4182 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4183 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4184 _cm->note_end_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4185 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4186 // This timing is only used by the ergonomics to handle our pause target. |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4187 // It is unclear why this should not include the full pause. We will |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4188 // investigate this in CR 7178365. |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4189 double sample_end_time_sec = os::elapsedTime(); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4190 double pause_time_ms = (sample_end_time_sec - sample_start_time_sec) * MILLIUNITS; |
10405 | 4191 g1_policy()->record_collection_pause_end(pause_time_ms, evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4192 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4193 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4194 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4195 // 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
|
4196 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4197 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4198 // 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
|
4199 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4200 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4201 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4202 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4203 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4204 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4205 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4206 // 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
|
4207 // 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
|
4208 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4209 // 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
|
4210 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4211 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4212 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4213 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4214 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4215 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4216 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4217 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
4218 verify_after_gc(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4219 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4220 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4221 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4222 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4223 // 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
|
4224 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4225 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4226 // 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
|
4227 // 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
|
4228 // 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
|
4229 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4230 _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
|
4231 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4232 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4233 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4234 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4235 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4236 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4237 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4238 #endif |
342 | 4239 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4240 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4241 } |
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4242 |
7207
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
4243 // Print the remainder of the GC log output. |
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
4244 log_gc_footer(os::elapsedTime() - pause_start_sec); |
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
4245 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4246 // It is not yet to safe to tell the concurrent mark to |
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4247 // start as we have some optional output below. We don't want the |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4248 // output from the concurrent mark thread interfering with this |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4249 // logging output either. |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4250 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4251 _hrs.verify_optional(); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4252 verify_region_sets_optional(); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4253 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4254 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4255 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4256 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4257 print_heap_after_gc(); |
10405 | 4258 trace_heap_after_gc(_gc_tracer_stw); |
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4259 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4260 // We must call G1MonitoringSupport::update_sizes() in the same scoping level |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4261 // as an active TraceMemoryManagerStats object (i.e. before the destructor for the |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4262 // TraceMemoryManagerStats is called) so that the G1 memory pools are updated |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4263 // before any GC notifications are raised. |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4264 g1mm()->update_sizes(); |
10405 | 4265 |
4266 _gc_tracer_stw->report_evacuation_info(&evacuation_info); | |
4267 _gc_tracer_stw->report_tenuring_threshold(_g1_policy->tenuring_threshold()); | |
4268 _gc_timer_stw->register_gc_end(os::elapsed_counter()); | |
4269 _gc_tracer_stw->report_gc_end(_gc_timer_stw->gc_end(), _gc_timer_stw->time_partitions()); | |
4270 } | |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4271 // 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
|
4272 // 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
|
4273 // that came from the pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4274 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4275 if (should_start_conc_mark) { |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4276 // CAUTION: after the doConcurrentMark() call below, |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4277 // the concurrent marking thread(s) could be running |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4278 // concurrently with us. Make sure that anything after |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4279 // 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
|
4280 // 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
|
4281 // 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
|
4282 // ConcurrentGCThread::safepoint_desynchronize(). |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4283 doConcurrentMark(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4284 } |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4285 |
1973 | 4286 return true; |
342 | 4287 } |
4288 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4289 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4290 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4291 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4292 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4293 case GCAllocForSurvived: |
6595 | 4294 gclab_word_size = _survivor_plab_stats.desired_plab_sz(); |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4295 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4296 case GCAllocForTenured: |
6595 | 4297 gclab_word_size = _old_plab_stats.desired_plab_sz(); |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4298 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4299 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4300 assert(false, "unknown GCAllocPurpose"); |
6595 | 4301 gclab_word_size = _old_plab_stats.desired_plab_sz(); |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4302 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4303 } |
6595 | 4304 |
4305 // Prevent humongous PLAB sizes for two reasons: | |
4306 // * PLABs are allocated using a similar paths as oops, but should | |
4307 // never be in a humongous region | |
4308 // * Allowing humongous PLABs needlessly churns the region free lists | |
4309 return MIN2(_humongous_object_threshold_in_words, gclab_word_size); | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4310 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4311 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4312 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
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4313 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
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|
4314 _mutator_alloc_region.init(); |
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|
4315 } |
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|
4316 |
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4317 void G1CollectedHeap::release_mutator_alloc_region() { |
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|
4318 _mutator_alloc_region.release(); |
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|
4319 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
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|
4320 } |
1391
79e419e5ea3b
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|
4321 |
10405 | 4322 void G1CollectedHeap::init_gc_alloc_regions(EvacuationInfo& evacuation_info) { |
3830
f44782f04dd4
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|
4323 assert_at_safepoint(true /* should_be_vm_thread */); |
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|
4324 |
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4325 _survivor_gc_alloc_region.init(); |
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4326 _old_gc_alloc_region.init(); |
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|
4327 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
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|
4328 _retained_old_gc_alloc_region = NULL; |
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|
4329 |
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|
4330 // We will discard the current GC alloc region if: |
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|
4331 // a) it's in the collection set (it can happen!), |
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|
4332 // b) it's already full (no point in using it), |
f44782f04dd4
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|
4333 // c) it's empty (this means that it was emptied during |
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|
4334 // a cleanup and it should be on the free list now), or |
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|
4335 // d) it's humongous (this means that it was emptied |
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4336 // during a cleanup and was added to the free list, but |
10405 | 4337 // has been subsequently used to allocate a humongous |
3830
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|
4338 // object that may be less than the region size). |
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|
4339 if (retained_region != NULL && |
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|
4340 !retained_region->in_collection_set() && |
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4341 !(retained_region->top() == retained_region->end()) && |
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4342 !retained_region->is_empty() && |
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|
4343 !retained_region->isHumongous()) { |
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4344 retained_region->set_saved_mark(); |
4072 | 4345 // The retained region was added to the old region set when it was |
4346 // retired. We have to remove it now, since we don't allow regions | |
4347 // we allocate to in the region sets. We'll re-add it later, when | |
4348 // it's retired again. | |
4349 _old_set.remove(retained_region); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4350 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
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4351 retained_region->note_start_of_copying(during_im); |
3830
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4352 _old_gc_alloc_region.set(retained_region); |
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|
4353 _hr_printer.reuse(retained_region); |
10405 | 4354 evacuation_info.set_alloc_regions_used_before(retained_region->used()); |
4355 } | |
4356 } | |
4357 | |
4358 void G1CollectedHeap::release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) { | |
4359 evacuation_info.set_allocation_regions(_survivor_gc_alloc_region.count() + | |
4360 _old_gc_alloc_region.count()); | |
3830
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|
4361 _survivor_gc_alloc_region.release(); |
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|
4362 // If we have an old GC alloc region to release, we'll save it in |
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|
4363 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
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|
4364 // _retained_old_gc_alloc_region will become NULL. This is what we |
f44782f04dd4
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|
4365 // want either way so no reason to check explicitly for either |
f44782f04dd4
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|
4366 // condition. |
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|
4367 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
6595 | 4368 |
4369 if (ResizePLAB) { | |
6819 | 4370 _survivor_plab_stats.adjust_desired_plab_sz(no_of_gc_workers); |
4371 _old_plab_stats.adjust_desired_plab_sz(no_of_gc_workers); | |
6595 | 4372 } |
342 | 4373 } |
4374 | |
3830
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|
4375 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
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|
4376 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
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|
4377 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
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|
4378 _retained_old_gc_alloc_region = NULL; |
342 | 4379 } |
4380 | |
4381 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
4382 _drain_in_progress = false; | |
4383 set_evac_failure_closure(cl); | |
6197 | 4384 _evac_failure_scan_stack = new (ResourceObj::C_HEAP, mtGC) GrowableArray<oop>(40, true); |
342 | 4385 } |
4386 | |
4387 void G1CollectedHeap::finalize_for_evac_failure() { | |
4388 assert(_evac_failure_scan_stack != NULL && | |
4389 _evac_failure_scan_stack->length() == 0, | |
4390 "Postcondition"); | |
4391 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 4392 delete _evac_failure_scan_stack; |
342 | 4393 _evac_failure_scan_stack = NULL; |
4394 } | |
4395 | |
4396 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
|
4397 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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parents:
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diff
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|
4398 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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diff
changeset
|
4399 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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diff
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|
4400 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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diff
changeset
|
4401 if (G1CollectedHeap::use_parallel_gc_threads()) { |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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parents:
4781
diff
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|
4402 set_par_threads(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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4781
diff
changeset
|
4403 workers()->run_task(&rsfp_task); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4404 set_par_threads(0); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4405 } else { |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4406 rsfp_task.work(0); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4407 } |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4408 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4409 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4410 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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diff
changeset
|
4411 // 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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4781
diff
changeset
|
4412 reset_cset_heap_region_claim_values(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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parents:
4781
diff
changeset
|
4413 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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parents:
4781
diff
changeset
|
4414 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
342 | 4415 |
4416 // Now restore saved marks, if any. | |
8038
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
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7455
diff
changeset
|
4417 assert(_objs_with_preserved_marks.size() == |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
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7455
diff
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|
4418 _preserved_marks_of_objs.size(), "Both or none."); |
ad747ee9d0b1
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brutisso
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diff
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|
4419 while (!_objs_with_preserved_marks.is_empty()) { |
ad747ee9d0b1
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brutisso
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diff
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|
4420 oop obj = _objs_with_preserved_marks.pop(); |
ad747ee9d0b1
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|
4421 markOop m = _preserved_marks_of_objs.pop(); |
ad747ee9d0b1
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|
4422 obj->set_mark(m); |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
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7455
diff
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|
4423 } |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
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diff
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|
4424 _objs_with_preserved_marks.clear(true); |
ad747ee9d0b1
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diff
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|
4425 _preserved_marks_of_objs.clear(true); |
342 | 4426 } |
4427 | |
4428 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4429 _evac_failure_scan_stack->push(obj); | |
4430 } | |
4431 | |
4432 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4433 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4434 | |
4435 while (_evac_failure_scan_stack->length() > 0) { | |
4436 oop obj = _evac_failure_scan_stack->pop(); | |
4437 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4438 obj->oop_iterate_backwards(_evac_failure_closure); | |
4439 } | |
4440 } | |
4441 | |
4442 oop | |
10405 | 4443 G1CollectedHeap::handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
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|
4444 oop old) { |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
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|
4445 assert(obj_in_cs(old), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
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|
4446 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4447 (HeapWord*) old)); |
342 | 4448 markOop m = old->mark(); |
4449 oop forward_ptr = old->forward_to_atomic(old); | |
4450 if (forward_ptr == NULL) { | |
4451 // Forward-to-self succeeded. | |
10405 | 4452 assert(_par_scan_state != NULL, "par scan state"); |
4453 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4454 uint queue_num = _par_scan_state->queue_num(); | |
4455 | |
4456 _evacuation_failed = true; | |
4457 _evacuation_failed_info_array[queue_num].register_copy_failure(old->size()); | |
342 | 4458 if (_evac_failure_closure != cl) { |
4459 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4460 assert(!_drain_in_progress, | |
4461 "Should only be true while someone holds the lock."); | |
4462 // Set the global evac-failure closure to the current thread's. | |
4463 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4464 set_evac_failure_closure(cl); | |
4465 // Now do the common part. | |
4466 handle_evacuation_failure_common(old, m); | |
4467 // Reset to NULL. | |
4468 set_evac_failure_closure(NULL); | |
4469 } else { | |
4470 // The lock is already held, and this is recursive. | |
4471 assert(_drain_in_progress, "This should only be the recursive case."); | |
4472 handle_evacuation_failure_common(old, m); | |
4473 } | |
4474 return old; | |
4475 } else { | |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
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|
4476 // 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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3317
diff
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|
4477 // space for this object (old != forward_ptr) or they beat us in |
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3317
diff
changeset
|
4478 // self-forwarding it (old == forward_ptr). |
75af3e8de182
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3317
diff
changeset
|
4479 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
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|
4480 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
75af3e8de182
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3317
diff
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|
4481 "should not be in the CSet", |
75af3e8de182
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3317
diff
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|
4482 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4483 return forward_ptr; |
4484 } | |
4485 } | |
4486 | |
4487 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4488 preserve_mark_if_necessary(old, m); | |
4489 | |
4490 HeapRegion* r = heap_region_containing(old); | |
4491 if (!r->evacuation_failed()) { | |
4492 r->set_evacuation_failed(true); | |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
4493 _hr_printer.evac_failure(r); |
342 | 4494 } |
4495 | |
4496 push_on_evac_failure_scan_stack(old); | |
4497 | |
4498 if (!_drain_in_progress) { | |
4499 // prevent recursion in copy_to_survivor_space() | |
4500 _drain_in_progress = true; | |
4501 drain_evac_failure_scan_stack(); | |
4502 _drain_in_progress = false; | |
4503 } | |
4504 } | |
4505 | |
4506 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4507 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4508 // We want to call the "for_promotion_failure" version only in the |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4509 // case of a promotion failure. |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4510 if (m->must_be_preserved_for_promotion_failure(obj)) { |
8038
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
parents:
7455
diff
changeset
|
4511 _objs_with_preserved_marks.push(obj); |
ad747ee9d0b1
8002144: G1: large number of evacuation failures may lead to large c heap memory usage
brutisso
parents:
7455
diff
changeset
|
4512 _preserved_marks_of_objs.push(m); |
342 | 4513 } |
4514 } | |
4515 | |
4516 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4517 size_t word_size) { | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4518 if (purpose == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4519 HeapWord* result = survivor_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4520 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4521 return result; |
342 | 4522 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4523 // 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
|
4524 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4525 return old_attempt_allocation(word_size); |
342 | 4526 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4527 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4528 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4529 HeapWord* result = old_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4530 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4531 return result; |
342 | 4532 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4533 // 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
|
4534 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4535 return survivor_attempt_allocation(word_size); |
342 | 4536 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4537 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4538 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4539 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4540 // Trying to keep some compilers happy. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4541 return NULL; |
342 | 4542 } |
4543 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4544 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4545 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4546 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4547 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4548 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4549 _refs(g1h->task_queue(queue_num)), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4550 _dcq(&g1h->dirty_card_queue_set()), |
12343 | 4551 _ct_bs(g1h->g1_barrier_set()), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4552 _g1_rem(g1h->g1_rem_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4553 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4554 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4555 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4556 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4557 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4558 _strong_roots_time(0), _term_time(0), |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4559 _alloc_buffer_waste(0), _undo_waste(0) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4560 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4561 // we "sacrifice" entry 0 to keep track of surviving bytes for |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4562 // non-young regions (where the age is -1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4563 // We also add a few elements at the beginning and at the end in |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4564 // an attempt to eliminate cache contention |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4565 uint real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4566 uint array_length = PADDING_ELEM_NUM + |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4567 real_length + |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4568 PADDING_ELEM_NUM; |
6197 | 4569 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length, mtGC); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4570 if (_surviving_young_words_base == NULL) |
10161
746b070f5022
8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
ccheung
parents:
10099
diff
changeset
|
4571 vm_exit_out_of_memory(array_length * sizeof(size_t), OOM_MALLOC_ERROR, |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4572 "Not enough space for young surv histo."); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4573 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4574 memset(_surviving_young_words, 0, (size_t) real_length * sizeof(size_t)); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4575 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4576 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4577 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4578 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4579 _start = os::elapsedTime(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4580 } |
342 | 4581 |
1709 | 4582 void |
4583 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4584 { | |
4585 st->print_raw_cr("GC Termination Stats"); | |
4586 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4587 " ------waste (KiB)------"); | |
4588 st->print_raw_cr("thr ms ms % ms % attempts" | |
4589 " total alloc undo"); | |
4590 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4591 " ------- ------- -------"); | |
4592 } | |
4593 | |
4594 void | |
4595 G1ParScanThreadState::print_termination_stats(int i, | |
4596 outputStream* const st) const | |
4597 { | |
4598 const double elapsed_ms = elapsed_time() * 1000.0; | |
4599 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4600 const double term_ms = term_time() * 1000.0; | |
4601 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4602 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4603 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4604 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4605 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4606 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4607 alloc_buffer_waste() * HeapWordSize / K, | |
4608 undo_waste() * HeapWordSize / K); | |
4609 } | |
4610 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4611 #ifdef ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4612 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4613 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4614 assert(UseCompressedOops, "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4615 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4616 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4617 assert(_g1h->is_in_g1_reserved(p), |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
4618 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, (void *)p)); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4619 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4620 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4621 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4622 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4623 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4624 if (has_partial_array_mask(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4625 // Must be in the collection set--it's already been copied. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4626 oop p = clear_partial_array_mask(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4627 assert(_g1h->obj_in_cs(p), |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
4628 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, (void *)p)); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4629 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4630 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4631 assert(_g1h->is_in_g1_reserved(p), |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
4632 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, (void *)p)); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4633 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4634 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4635 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4636 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4637 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4638 if (ref.is_narrow()) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4639 return verify_ref((narrowOop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4640 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4641 return verify_ref((oop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4642 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4643 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4644 #endif // ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4645 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4646 void G1ParScanThreadState::trim_queue() { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4647 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4648 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4649 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4650 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4651 StarTask ref; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4652 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4653 // Drain the overflow stack first, so other threads can steal. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4654 while (refs()->pop_overflow(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4655 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4656 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4657 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
changeset
|
4658 while (refs()->pop_local(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4659 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
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|
4660 } |
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4661 } while (!refs()->is_empty()); |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
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|
4662 } |
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|
4663 |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
4664 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
2ace1c4ee8da
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|
4665 G1ParScanThreadState* par_scan_state) : |
342 | 4666 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4667 _par_scan_state(par_scan_state), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
4668 _worker_id(par_scan_state->queue_num()), |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4669 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4670 _mark_in_progress(_g1->mark_in_progress()) { } |
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|
4671 |
5987 | 4672 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4673 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object>::mark_object(oop obj) { | |
4787
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|
4674 #ifdef ASSERT |
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|
4675 HeapRegion* hr = _g1->heap_region_containing(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4676 assert(hr != NULL, "sanity"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4677 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
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|
4678 #endif // ASSERT |
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|
4679 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4680 // We know that the object is not moving so it's safe to read its size. |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
4681 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
4787
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|
4682 } |
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|
4683 |
5987 | 4684 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4685 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
4686 ::mark_forwarded_object(oop from_obj, oop to_obj) { | |
4787
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|
4687 #ifdef ASSERT |
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|
4688 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
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|
4689 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4690 assert(from_obj != to_obj, "should not be self-forwarded"); |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4691 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4692 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
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|
4693 assert(from_hr != NULL, "sanity"); |
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parents:
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diff
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|
4694 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
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|
4695 |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4696 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4697 assert(to_hr != NULL, "sanity"); |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
4698 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
4699 #endif // ASSERT |
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|
4700 |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4701 // The object might be in the process of being copied by another |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
4702 // worker so we cannot trust that its to-space image is |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
4703 // well-formed. So we have to read its size from its from-space |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
4704 // image which we know should not be changing. |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4834
diff
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|
4705 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
4787
2ace1c4ee8da
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diff
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|
4706 } |
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diff
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|
4707 |
5987 | 4708 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4709 oop G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
4710 ::copy_to_survivor_space(oop old) { | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
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|
4711 size_t word_sz = old->size(); |
342 | 4712 HeapRegion* from_region = _g1->heap_region_containing_raw(old); |
4713 // +1 to make the -1 indexes valid... | |
4714 int young_index = from_region->young_index_in_cset()+1; | |
4787
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|
4715 assert( (from_region->is_young() && young_index > 0) || |
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diff
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|
4716 (!from_region->is_young() && young_index == 0), "invariant" ); |
342 | 4717 G1CollectorPolicy* g1p = _g1->g1_policy(); |
4718 markOop m = old->mark(); | |
545 | 4719 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4720 : m->age(); | |
4721 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4722 word_sz); |
4723 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
6629
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4724 #ifndef PRODUCT |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4725 // Should this evacuation fail? |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
6628
diff
changeset
|
4726 if (_g1->evacuation_should_fail()) { |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
4727 if (obj_ptr != NULL) { |
c9814fadeb38
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parents:
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diff
changeset
|
4728 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4729 obj_ptr = NULL; |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4730 } |
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7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4731 } |
c9814fadeb38
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parents:
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diff
changeset
|
4732 #endif // !PRODUCT |
342 | 4733 |
4734 if (obj_ptr == NULL) { | |
4735 // This will either forward-to-self, or detect that someone else has | |
4736 // installed a forwarding pointer. | |
10405 | 4737 return _g1->handle_evacuation_failure_par(_par_scan_state, old); |
342 | 4738 } |
4739 | |
6629
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
changeset
|
4740 oop obj = oop(obj_ptr); |
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parents:
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diff
changeset
|
4741 |
526 | 4742 // We're going to allocate linearly, so might as well prefetch ahead. |
4743 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4744 | |
342 | 4745 oop forward_ptr = old->forward_to_atomic(obj); |
4746 if (forward_ptr == NULL) { | |
4747 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4748 if (g1p->track_object_age(alloc_purpose)) { |
4749 // We could simply do obj->incr_age(). However, this causes a | |
4750 // performance issue. obj->incr_age() will first check whether | |
4751 // the object has a displaced mark by checking its mark word; | |
4752 // getting the mark word from the new location of the object | |
4753 // stalls. So, given that we already have the mark word and we | |
4754 // are about to install it anyway, it's better to increase the | |
4755 // age on the mark word, when the object does not have a | |
4756 // displaced mark word. We're not expecting many objects to have | |
4757 // a displaced marked word, so that case is not optimized | |
4758 // further (it could be...) and we simply call obj->incr_age(). | |
4759 | |
4760 if (m->has_displaced_mark_helper()) { | |
4761 // in this case, we have to install the mark word first, | |
4762 // otherwise obj looks to be forwarded (the old mark word, | |
4763 // which contains the forward pointer, was copied) | |
4764 obj->set_mark(m); | |
4765 obj->incr_age(); | |
4766 } else { | |
4767 m = m->incr_age(); | |
545 | 4768 obj->set_mark(m); |
526 | 4769 } |
545 | 4770 _par_scan_state->age_table()->add(obj, word_sz); |
4771 } else { | |
4772 obj->set_mark(m); | |
526 | 4773 } |
4774 | |
342 | 4775 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
4776 surv_young_words[young_index] += word_sz; | |
4777 | |
4778 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
tonyp
parents:
4783
diff
changeset
|
4779 // 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
|
4780 // 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
|
4781 // length field of the from-space object. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4782 arrayOop(obj)->set_length(0); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
4783 oop* old_p = set_partial_array_mask(old); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4784 _par_scan_state->push_on_queue(old_p); |
342 | 4785 } else { |
526 | 4786 // No point in using the slower heap_region_containing() method, |
4787 // given that we know obj is in the heap. | |
5987 | 4788 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
4789 obj->oop_iterate_backwards(&_scanner); | |
342 | 4790 } |
4791 } else { | |
4792 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4793 obj = forward_ptr; | |
4794 } | |
4795 return obj; | |
4796 } | |
4797 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4798 template <class T> |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
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diff
changeset
|
4799 void G1ParCopyHelper::do_klass_barrier(T* p, oop new_obj) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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diff
changeset
|
4800 if (_g1->heap_region_containing_raw(new_obj)->is_young()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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diff
changeset
|
4801 _scanned_klass->record_modified_oops(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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diff
changeset
|
4802 } |
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6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
4803 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
4804 |
3886
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diff
changeset
|
4805 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4806 template <class T> |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
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|
4807 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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|
4808 ::do_oop_work(T* p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4809 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4810 assert(barrier != G1BarrierRS || obj != NULL, |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4811 "Precondition: G1BarrierRS implies obj is non-NULL"); |
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|
4812 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4834
diff
changeset
|
4813 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4834
diff
changeset
|
4814 |
526 | 4815 // 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
|
4816 if (_g1->in_cset_fast_test(obj)) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4817 oop forwardee; |
526 | 4818 if (obj->is_forwarded()) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4819 forwardee = obj->forwardee(); |
526 | 4820 } else { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4821 forwardee = copy_to_survivor_space(obj); |
342 | 4822 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4823 assert(forwardee != NULL, "forwardee should not be NULL"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4824 oopDesc::encode_store_heap_oop(p, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4825 if (do_mark_object && forwardee != obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4826 // If the object is self-forwarded we don't need to explicitly |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4827 // 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
|
4828 mark_forwarded_object(obj, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4829 } |
2ace1c4ee8da
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tonyp
parents:
4785
diff
changeset
|
4830 |
526 | 4831 // When scanning the RS, we only care about objs in CS. |
4832 if (barrier == G1BarrierRS) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4833 _par_scan_state->update_rs(_from, p, _worker_id); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4834 } else if (barrier == G1BarrierKlass) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4835 do_klass_barrier(p, forwardee); |
342 | 4836 } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4837 } else { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3869
diff
changeset
|
4838 // The object is not in collection set. If we're a root scanning |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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3869
diff
changeset
|
4839 // 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
|
4840 // 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
|
4841 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
|
4842 mark_object(obj); |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4843 } |
526 | 4844 } |
4845 | |
4846 if (barrier == G1BarrierEvac && obj != NULL) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4847 _par_scan_state->update_rs(_from, p, _worker_id); |
526 | 4848 } |
4849 | |
4850 if (do_gen_barrier && obj != NULL) { | |
4851 par_do_barrier(p); | |
4852 } | |
4853 } | |
4854 | |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4855 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4856 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4857 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4858 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4859 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
|
4860 oop from_obj = clear_partial_array_mask(p); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4861 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4862 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
|
4863 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
|
4864 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
|
4865 // 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
|
4866 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
|
4867 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4868 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
|
4869 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
|
4870 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
|
4871 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
|
4872 // 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
|
4873 // to-space object. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4874 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
|
4875 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
|
4876 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
|
4877 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4878 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
|
4879 int end = length; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4880 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
|
4881 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
342 | 4882 if (remainder > 2 * ParGCArrayScanChunk) { |
4883 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
|
4884 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
|
4885 // 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
|
4886 // 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
|
4887 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
|
4888 _par_scan_state->push_on_queue(from_obj_p); |
342 | 4889 } else { |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4890 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
|
4891 // 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
|
4892 // 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
|
4893 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
|
4894 } |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4895 _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
|
4896 // 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
|
4897 // 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
|
4898 // 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
|
4899 // 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
|
4900 // 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
|
4901 // 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
|
4902 // 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
|
4903 // 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
|
4904 to_obj_array->oop_iterate_range(&_scanner, start, end); |
342 | 4905 } |
4906 | |
4907 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4908 protected: | |
4909 G1CollectedHeap* _g1h; | |
4910 G1ParScanThreadState* _par_scan_state; | |
4911 RefToScanQueueSet* _queues; | |
4912 ParallelTaskTerminator* _terminator; | |
4913 | |
4914 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4915 RefToScanQueueSet* queues() { return _queues; } | |
4916 ParallelTaskTerminator* terminator() { return _terminator; } | |
4917 | |
4918 public: | |
4919 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4920 G1ParScanThreadState* par_scan_state, | |
4921 RefToScanQueueSet* queues, | |
4922 ParallelTaskTerminator* terminator) | |
4923 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4924 _queues(queues), _terminator(terminator) {} | |
4925 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4926 void do_void(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4927 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4928 private: |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4929 inline bool offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4930 }; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4931 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4932 bool G1ParEvacuateFollowersClosure::offer_termination() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4933 G1ParScanThreadState* const pss = par_scan_state(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4934 pss->start_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4935 const bool res = terminator()->offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4936 pss->end_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4937 return res; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4938 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4939 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4940 void G1ParEvacuateFollowersClosure::do_void() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4941 StarTask stolen_task; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4942 G1ParScanThreadState* const pss = par_scan_state(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4943 pss->trim_queue(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4944 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4945 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4946 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4947 assert(pss->verify_task(stolen_task), "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4948 if (stolen_task.is_narrow()) { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4949 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4950 } else { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4951 pss->deal_with_reference((oop*) stolen_task); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4952 } |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4953 |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4954 // We've just processed a reference and we might have made |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4955 // available new entries on the queues. So we have to make sure |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4956 // we drain the queues as necessary. |
342 | 4957 pss->trim_queue(); |
4958 } | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4959 } while (!offer_termination()); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4960 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4961 pss->retire_alloc_buffers(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4962 } |
342 | 4963 |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4964 class G1KlassScanClosure : public KlassClosure { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4965 G1ParCopyHelper* _closure; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4966 bool _process_only_dirty; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4967 int _count; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4968 public: |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4969 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4970 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {} |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4971 void do_klass(Klass* klass) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4972 // If the klass has not been dirtied we know that there's |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4973 // no references into the young gen and we can skip it. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4974 if (!_process_only_dirty || klass->has_modified_oops()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4975 // Clean the klass since we're going to scavenge all the metadata. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4976 klass->clear_modified_oops(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4977 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4978 // Tell the closure that this klass is the Klass to scavenge |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4979 // and is the one to dirty if oops are left pointing into the young gen. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4980 _closure->set_scanned_klass(klass); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4981 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4982 klass->oops_do(_closure); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4983 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4984 _closure->set_scanned_klass(NULL); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4985 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4986 _count++; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
4987 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
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|
4988 }; |
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4989 |
342 | 4990 class G1ParTask : public AbstractGangTask { |
4991 protected: | |
4992 G1CollectedHeap* _g1h; | |
4993 RefToScanQueueSet *_queues; | |
4994 ParallelTaskTerminator _terminator; | |
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4995 uint _n_workers; |
342 | 4996 |
4997 Mutex _stats_lock; | |
4998 Mutex* stats_lock() { return &_stats_lock; } | |
4999 | |
5000 size_t getNCards() { | |
5001 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
5002 / G1BlockOffsetSharedArray::N_bytes; | |
5003 } | |
5004 | |
5005 public: | |
4095
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5006 G1ParTask(G1CollectedHeap* g1h, |
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5007 RefToScanQueueSet *task_queues) |
342 | 5008 : AbstractGangTask("G1 collection"), |
5009 _g1h(g1h), | |
5010 _queues(task_queues), | |
4095
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5011 _terminator(0, _queues), |
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5012 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 5013 {} |
5014 | |
5015 RefToScanQueueSet* queues() { return _queues; } | |
5016 | |
5017 RefToScanQueue *work_queue(int i) { | |
5018 return queues()->queue(i); | |
5019 } | |
5020 | |
4095
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5021 ParallelTaskTerminator* terminator() { return &_terminator; } |
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5022 |
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5023 virtual void set_for_termination(int active_workers) { |
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5024 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
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5025 // in the young space (_par_seq_tasks) in the G1 heap |
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5026 // for SequentialSubTasksDone. |
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5027 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
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5028 // both of which need setting by set_n_termination(). |
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5029 _g1h->SharedHeap::set_n_termination(active_workers); |
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5030 _g1h->set_n_termination(active_workers); |
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5031 terminator()->reset_for_reuse(active_workers); |
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5032 _n_workers = active_workers; |
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5033 } |
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5034 |
4728
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5035 void work(uint worker_id) { |
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5036 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 5037 |
5038 double start_time_ms = os::elapsedTime() * 1000.0; | |
6219
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5039 _g1h->g1_policy()->phase_times()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 5040 |
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5041 { |
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5042 ResourceMark rm; |
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5043 HandleMark hm; |
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5044 |
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5045 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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5046 |
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5047 G1ParScanThreadState pss(_g1h, worker_id); |
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5048 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
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5049 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
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5050 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
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5051 |
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|
5052 pss.set_evac_closure(&scan_evac_cl); |
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5053 pss.set_evac_failure_closure(&evac_failure_cl); |
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5054 pss.set_partial_scan_closure(&partial_scan_cl); |
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5055 |
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|
5056 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
6725
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5057 G1ParScanMetadataClosure only_scan_metadata_cl(_g1h, &pss, rp); |
5986
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5058 |
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5059 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
6725
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5060 G1ParScanAndMarkMetadataClosure scan_mark_metadata_cl(_g1h, &pss, rp); |
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5061 |
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5062 bool only_young = _g1h->g1_policy()->gcs_are_young(); |
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5063 G1KlassScanClosure scan_mark_klasses_cl_s(&scan_mark_metadata_cl, false); |
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5064 G1KlassScanClosure only_scan_klasses_cl_s(&only_scan_metadata_cl, only_young); |
5986
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5065 |
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5066 OopClosure* scan_root_cl = &only_scan_root_cl; |
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5067 G1KlassScanClosure* scan_klasses_cl = &only_scan_klasses_cl_s; |
5986
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5068 |
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|
5069 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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5070 // We also need to mark copied objects. |
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5071 scan_root_cl = &scan_mark_root_cl; |
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5072 scan_klasses_cl = &scan_mark_klasses_cl_s; |
5986
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|
5073 } |
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|
5074 |
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|
5075 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
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|
5076 |
12080 | 5077 // Don't scan the scavengable methods in the code cache as part |
5078 // of strong root scanning. The code roots that point into a | |
5079 // region in the collection set are scanned when we scan the | |
5080 // region's RSet. | |
5081 int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings; | |
6725
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|
5082 |
5986
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|
5083 pss.start_strong_roots(); |
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5084 _g1h->g1_process_strong_roots(/* is scavenging */ true, |
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|
5085 SharedHeap::ScanningOption(so), |
5986
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|
5086 scan_root_cl, |
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|
5087 &push_heap_rs_cl, |
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5088 scan_klasses_cl, |
5986
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|
5089 worker_id); |
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|
5090 pss.end_strong_roots(); |
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|
5091 |
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|
5092 { |
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|
5093 double start = os::elapsedTime(); |
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|
5094 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); |
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|
5095 evac.do_void(); |
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|
5096 double elapsed_ms = (os::elapsedTime()-start)*1000.0; |
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|
5097 double term_ms = pss.term_time()*1000.0; |
6628
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|
5098 _g1h->g1_policy()->phase_times()->add_obj_copy_time(worker_id, elapsed_ms-term_ms); |
6219
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5099 _g1h->g1_policy()->phase_times()->record_termination(worker_id, term_ms, pss.term_attempts()); |
5986
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|
5100 } |
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|
5101 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
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5102 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
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|
5103 |
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|
5104 if (ParallelGCVerbose) { |
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|
5105 MutexLocker x(stats_lock()); |
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|
5106 pss.print_termination_stats(worker_id); |
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|
5107 } |
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|
5108 |
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|
5109 assert(pss.refs()->is_empty(), "should be empty"); |
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|
5110 |
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|
5111 // Close the inner scope so that the ResourceMark and HandleMark |
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5112 // destructors are executed here and are included as part of the |
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|
5113 // "GC Worker Time". |
342 | 5114 } |
5115 | |
1611 | 5116 double end_time_ms = os::elapsedTime() * 1000.0; |
6219
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5117 _g1h->g1_policy()->phase_times()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 5118 } |
5119 }; | |
5120 | |
5121 // *** Common G1 Evacuation Stuff | |
5122 | |
1833
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5123 // This method is run in a GC worker. |
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|
5124 |
342 | 5125 void |
5126 G1CollectedHeap:: | |
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5127 g1_process_strong_roots(bool is_scavenging, |
4910
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|
5128 ScanningOption so, |
342 | 5129 OopClosure* scan_non_heap_roots, |
5130 OopsInHeapRegionClosure* scan_rs, | |
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5131 G1KlassScanClosure* scan_klasses, |
342 | 5132 int worker_i) { |
3979
4dfb2df418f2
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|
5133 |
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5134 // First scan the strong roots |
342 | 5135 double ext_roots_start = os::elapsedTime(); |
5136 double closure_app_time_sec = 0.0; | |
5137 | |
5138 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
5139 | |
12080 | 5140 assert(so & SO_CodeCache || scan_rs != NULL, "must scan code roots somehow"); |
5141 // Walk the code cache/strong code roots w/o buffering, because StarTask | |
5142 // cannot handle unaligned oop locations. | |
5143 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, true /* do_marking */); | |
989
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|
5144 |
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|
5145 process_strong_roots(false, // no scoping; this is parallel code |
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|
5146 is_scavenging, so, |
342 | 5147 &buf_scan_non_heap_roots, |
989
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|
5148 &eager_scan_code_roots, |
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|
5149 scan_klasses |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
5150 ); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5151 |
3979
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6484982: G1: process references during evacuation pauses
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|
5152 // Now the CM ref_processor roots. |
3823
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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diff
changeset
|
5153 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
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diff
changeset
|
5154 // We need to treat the discovered reference lists of the |
4dfb2df418f2
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diff
changeset
|
5155 // concurrent mark ref processor as roots and keep entries |
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|
5156 // (which are added by the marking threads) on them live |
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6484982: G1: process references during evacuation pauses
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|
5157 // until they can be processed at the end of marking. |
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|
5158 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
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diff
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|
5159 } |
14a2fd14c0db
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diff
changeset
|
5160 |
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diff
changeset
|
5161 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 5162 buf_scan_non_heap_roots.done(); |
6725
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|
5163 |
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6964458: Reimplement class meta-data storage to use native memory
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|
5164 double obj_copy_time_sec = buf_scan_non_heap_roots.closure_app_seconds(); |
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|
5165 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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diff
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|
5166 g1_policy()->phase_times()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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|
5167 |
342 | 5168 double ext_root_time_ms = |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
5169 ((os::elapsedTime() - ext_roots_start) - obj_copy_time_sec) * 1000.0; |
3823
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|
5170 |
6219
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5171 g1_policy()->phase_times()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
342 | 5172 |
4787
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5173 // During conc marking we have to filter the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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5174 // 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
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|
5175 // as implicitly live). |
6628
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|
5176 double satb_filtering_ms = 0.0; |
4787
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|
5177 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
2ace1c4ee8da
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5178 if (mark_in_progress()) { |
6628
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|
5179 double satb_filter_start = os::elapsedTime(); |
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|
5180 |
4787
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|
5181 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
6628
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|
5182 |
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|
5183 satb_filtering_ms = (os::elapsedTime() - satb_filter_start) * 1000.0; |
4787
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|
5184 } |
2ace1c4ee8da
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diff
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|
5185 } |
6219
922993931b3d
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diff
changeset
|
5186 g1_policy()->phase_times()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
342 | 5187 |
12080 | 5188 // If this is an initial mark pause, and we're not scanning |
5189 // the entire code cache, we need to mark the oops in the | |
5190 // strong code root lists for the regions that are not in | |
5191 // the collection set. | |
5192 // Note all threads participate in this set of root tasks. | |
5193 double mark_strong_code_roots_ms = 0.0; | |
5194 if (g1_policy()->during_initial_mark_pause() && !(so & SO_CodeCache)) { | |
5195 double mark_strong_roots_start = os::elapsedTime(); | |
5196 mark_strong_code_roots(worker_i); | |
5197 mark_strong_code_roots_ms = (os::elapsedTime() - mark_strong_roots_start) * 1000.0; | |
5198 } | |
5199 g1_policy()->phase_times()->record_strong_code_root_mark_time(worker_i, mark_strong_code_roots_ms); | |
5200 | |
342 | 5201 // Now scan the complement of the collection set. |
5202 if (scan_rs != NULL) { | |
12080 | 5203 g1_rem_set()->oops_into_collection_set_do(scan_rs, &eager_scan_code_roots, worker_i); |
342 | 5204 } |
5205 _process_strong_tasks->all_tasks_completed(); | |
5206 } | |
5207 | |
5208 void | |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
10099
diff
changeset
|
5209 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5210 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
10179
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stefank
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10099
diff
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|
5211 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs); |
342 | 5212 } |
5213 | |
3979
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changeset
|
5214 // Weak Reference Processing support |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5215 |
4dfb2df418f2
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|
5216 // An always "is_alive" closure that is used to preserve referents. |
4dfb2df418f2
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changeset
|
5217 // If the object is non-null then it's alive. Used in the preservation |
4dfb2df418f2
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diff
changeset
|
5218 // of referent objects that are pointed to by reference objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5219 // discovered by the CM ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5220 class G1AlwaysAliveClosure: public BoolObjectClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5221 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5222 public: |
4dfb2df418f2
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diff
changeset
|
5223 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5224 bool do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5225 if (p != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5226 return true; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5227 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5228 return false; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5229 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5230 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5231 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5232 bool G1STWIsAliveClosure::do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5233 // An object is reachable if it is outside the collection set, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5234 // or is inside and copied. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5235 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5236 } |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5237 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5238 // Non Copying Keep Alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 class G1KeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
5242 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5244 void do_oop( oop* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 oop obj = *p; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5246 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5247 if (_g1->obj_in_cs(obj)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 assert( obj->is_forwarded(), "invariant" ); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 *p = obj->forwardee(); |
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 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5254 // Copying Keep Alive closure - can be called from both |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 // serial and parallel code as long as different worker |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5256 // threads utilize different G1ParScanThreadState instances |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 // and different queues. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5261 OopClosure* _copy_non_heap_obj_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5262 OopsInHeapRegionClosure* _copy_metadata_obj_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5263 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5265 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
5266 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 OopClosure* non_heap_obj_cl, |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5268 OopsInHeapRegionClosure* metadata_obj_cl, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 G1ParScanThreadState* pss): |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 _copy_non_heap_obj_cl(non_heap_obj_cl), |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5272 _copy_metadata_obj_cl(metadata_obj_cl), |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 virtual void do_oop( oop* p) { do_oop_work(p); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 template <class T> void do_oop_work(T* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 oop obj = oopDesc::load_decode_heap_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 if (_g1h->obj_in_cs(obj)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 // If the referent object has been forwarded (either copied |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5284 // to a new location or to itself in the event of an |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5285 // evacuation failure) then we need to update the reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 // heap, update the RSet for the referent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5289 // If the referent has not been forwarded then we have to keep |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 // it alive by policy. Therefore we have copy the referent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
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|
5293 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
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diff
changeset
|
5294 // phase of reference processing) the object and it's followers |
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diff
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|
5295 // will be copied, the reference field set to point to the |
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|
5296 // new location, and the RSet updated. Otherwise we need to |
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|
5297 // use the the non-heap or metadata closures directly to copy |
10405 | 5298 // the referent object and update the pointer, while avoiding |
3979
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|
5299 // updating the RSet. |
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diff
changeset
|
5300 |
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|
5301 if (_g1h->is_in_g1_reserved(p)) { |
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|
5302 _par_scan_state->push_on_queue(p); |
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|
5303 } else { |
6725
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|
5304 assert(!ClassLoaderDataGraph::contains((address)p), |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
5305 err_msg("Otherwise need to call _copy_metadata_obj_cl->do_oop(p) " |
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|
5306 PTR_FORMAT, p)); |
3979
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|
5307 _copy_non_heap_obj_cl->do_oop(p); |
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|
5308 } |
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diff
changeset
|
5309 } |
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diff
changeset
|
5310 } |
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diff
changeset
|
5311 }; |
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diff
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|
5312 |
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|
5313 // Serial drain queue closure. Called as the 'complete_gc' |
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|
5314 // closure for each discovered list in some of the |
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changeset
|
5315 // reference processing phases. |
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|
5316 |
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|
5317 class G1STWDrainQueueClosure: public VoidClosure { |
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|
5318 protected: |
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|
5319 G1CollectedHeap* _g1h; |
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|
5320 G1ParScanThreadState* _par_scan_state; |
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|
5321 |
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|
5322 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
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|
5323 |
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|
5324 public: |
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|
5325 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
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|
5326 _g1h(g1h), |
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|
5327 _par_scan_state(pss) |
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|
5328 { } |
4dfb2df418f2
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parents:
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diff
changeset
|
5329 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5330 void do_void() { |
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|
5331 G1ParScanThreadState* const pss = par_scan_state(); |
4dfb2df418f2
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|
5332 pss->trim_queue(); |
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|
5333 } |
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changeset
|
5334 }; |
4dfb2df418f2
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diff
changeset
|
5335 |
4dfb2df418f2
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|
5336 // Parallel Reference Processing closures |
4dfb2df418f2
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parents:
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diff
changeset
|
5337 |
4dfb2df418f2
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parents:
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diff
changeset
|
5338 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
4dfb2df418f2
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parents:
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diff
changeset
|
5339 // processing during G1 evacuation pauses. |
4dfb2df418f2
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parents:
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diff
changeset
|
5340 |
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|
5341 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
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|
5342 private: |
4dfb2df418f2
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parents:
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diff
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|
5343 G1CollectedHeap* _g1h; |
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|
5344 RefToScanQueueSet* _queues; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
5345 FlexibleWorkGang* _workers; |
3979
4dfb2df418f2
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parents:
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|
5346 int _active_workers; |
4dfb2df418f2
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parents:
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diff
changeset
|
5347 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5348 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
5349 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
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diff
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|
5350 FlexibleWorkGang* workers, |
3979
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parents:
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diff
changeset
|
5351 RefToScanQueueSet *task_queues, |
4dfb2df418f2
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diff
changeset
|
5352 int n_workers) : |
4dfb2df418f2
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parents:
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diff
changeset
|
5353 _g1h(g1h), |
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diff
changeset
|
5354 _queues(task_queues), |
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parents:
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diff
changeset
|
5355 _workers(workers), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5356 _active_workers(n_workers) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5357 { |
4dfb2df418f2
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parents:
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diff
changeset
|
5358 assert(n_workers > 0, "shouldn't call this otherwise"); |
4dfb2df418f2
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parents:
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diff
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|
5359 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5360 |
4dfb2df418f2
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parents:
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diff
changeset
|
5361 // Executes the given task using concurrent marking worker threads. |
4dfb2df418f2
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parents:
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diff
changeset
|
5362 virtual void execute(ProcessTask& task); |
4dfb2df418f2
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parents:
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diff
changeset
|
5363 virtual void execute(EnqueueTask& task); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5364 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
5365 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5366 // Gang task for possibly parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5367 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5368 class G1STWRefProcTaskProxy: public AbstractGangTask { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5369 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 ProcessTask& _proc_task; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5371 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5372 RefToScanQueueSet *_task_queues; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5373 ParallelTaskTerminator* _terminator; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5374 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5375 public: |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5376 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5377 G1CollectedHeap* g1h, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5378 RefToScanQueueSet *task_queues, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5379 ParallelTaskTerminator* terminator) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5380 AbstractGangTask("Process reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5381 _proc_task(proc_task), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5382 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5383 _task_queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5384 _terminator(terminator) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5385 {} |
4dfb2df418f2
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parents:
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diff
changeset
|
5386 |
4728
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7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5387 virtual void work(uint worker_id) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5388 // The reference processing task executed by a single worker. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5389 ResourceMark rm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5390 HandleMark hm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5391 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5392 G1STWIsAliveClosure is_alive(_g1h); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5393 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5394 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5395 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5396 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
5397 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5398 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5399 |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5400 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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parents:
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diff
changeset
|
5401 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5402 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
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parents:
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diff
changeset
|
5403 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5404 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
6725
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coleenp
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6629
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|
5405 G1ParScanMetadataClosure only_copy_metadata_cl(_g1h, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5406 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5407 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
6725
da91efe96a93
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coleenp
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6629
diff
changeset
|
5408 G1ParScanAndMarkMetadataClosure copy_mark_metadata_cl(_g1h, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5409 |
4dfb2df418f2
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3973
diff
changeset
|
5410 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
6725
da91efe96a93
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coleenp
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6629
diff
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|
5411 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5412 |
4dfb2df418f2
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diff
changeset
|
5413 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5414 // We also need to mark copied objects. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5415 copy_non_heap_cl = ©_mark_non_heap_cl; |
6725
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coleenp
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6629
diff
changeset
|
5416 copy_metadata_cl = ©_mark_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5417 } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5418 |
4dfb2df418f2
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diff
changeset
|
5419 // Keep alive closure. |
6725
da91efe96a93
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coleenp
parents:
6629
diff
changeset
|
5420 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_metadata_cl, &pss); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5421 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5422 // Complete GC closure |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5423 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
4dfb2df418f2
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5424 |
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|
5425 // Call the reference processing task's work routine. |
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5426 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
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|
5427 |
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|
5428 // Note we cannot assert that the refs array is empty here as not all |
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|
5429 // of the processing tasks (specifically phase2 - pp2_work) execute |
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|
5430 // the complete_gc closure (which ordinarily would drain the queue) so |
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|
5431 // the queue may not be empty. |
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|
5432 } |
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|
5433 }; |
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diff
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|
5434 |
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|
5435 // Driver routine for parallel reference processing. |
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|
5436 // Creates an instance of the ref processing gang |
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|
5437 // task and has the worker threads execute it. |
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|
5438 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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|
5439 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5440 |
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|
5441 ParallelTaskTerminator terminator(_active_workers, _queues); |
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|
5442 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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|
5443 |
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|
5444 _g1h->set_par_threads(_active_workers); |
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|
5445 _workers->run_task(&proc_task_proxy); |
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|
5446 _g1h->set_par_threads(0); |
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|
5447 } |
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|
5448 |
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|
5449 // Gang task for parallel reference enqueueing. |
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|
5450 |
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|
5451 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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5452 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
5453 EnqueueTask& _enq_task; |
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|
5454 |
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|
5455 public: |
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|
5456 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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|
5457 AbstractGangTask("Enqueue reference objects in parallel"), |
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|
5458 _enq_task(enq_task) |
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|
5459 { } |
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|
5460 |
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|
5461 virtual void work(uint worker_id) { |
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|
5462 _enq_task.work(worker_id); |
3979
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|
5463 } |
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|
5464 }; |
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|
5465 |
10405 | 5466 // Driver routine for parallel reference enqueueing. |
3979
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|
5467 // Creates an instance of the ref enqueueing gang |
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|
5468 // task and has the worker threads execute it. |
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|
5469 |
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|
5470 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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|
5471 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5472 |
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|
5473 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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|
5474 |
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|
5475 _g1h->set_par_threads(_active_workers); |
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|
5476 _workers->run_task(&enq_task_proxy); |
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|
5477 _g1h->set_par_threads(0); |
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|
5478 } |
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diff
changeset
|
5479 |
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|
5480 // End of weak reference support closures |
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diff
changeset
|
5481 |
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|
5482 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5483 // that are in the collection set and are pointed to by reference |
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|
5484 // objects discovered by the CM ref processor. |
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diff
changeset
|
5485 |
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|
5486 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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changeset
|
5487 protected: |
4dfb2df418f2
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parents:
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diff
changeset
|
5488 G1CollectedHeap* _g1h; |
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diff
changeset
|
5489 RefToScanQueueSet *_queues; |
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diff
changeset
|
5490 ParallelTaskTerminator _terminator; |
4728
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diff
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|
5491 uint _n_workers; |
3979
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diff
changeset
|
5492 |
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diff
changeset
|
5493 public: |
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diff
changeset
|
5494 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
4dfb2df418f2
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|
5495 AbstractGangTask("ParPreserveCMReferents"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5496 _g1h(g1h), |
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diff
changeset
|
5497 _queues(task_queues), |
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diff
changeset
|
5498 _terminator(workers, _queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5499 _n_workers(workers) |
4dfb2df418f2
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parents:
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diff
changeset
|
5500 { } |
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diff
changeset
|
5501 |
4728
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diff
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|
5502 void work(uint worker_id) { |
3979
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parents:
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diff
changeset
|
5503 ResourceMark rm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5504 HandleMark hm; |
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parents:
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diff
changeset
|
5505 |
4728
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jmasa
parents:
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diff
changeset
|
5506 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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diff
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|
5507 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5508 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5509 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5510 |
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6484982: G1: process references during evacuation pauses
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diff
changeset
|
5511 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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diff
changeset
|
5512 pss.set_evac_failure_closure(&evac_failure_cl); |
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diff
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|
5513 pss.set_partial_scan_closure(&partial_scan_cl); |
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diff
changeset
|
5514 |
4dfb2df418f2
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diff
changeset
|
5515 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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diff
changeset
|
5516 |
4dfb2df418f2
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diff
changeset
|
5517 |
4dfb2df418f2
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diff
changeset
|
5518 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6629
diff
changeset
|
5519 G1ParScanMetadataClosure only_copy_metadata_cl(_g1h, &pss, NULL); |
3979
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diff
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|
5520 |
4dfb2df418f2
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diff
changeset
|
5521 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
6725
da91efe96a93
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coleenp
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6629
diff
changeset
|
5522 G1ParScanAndMarkMetadataClosure copy_mark_metadata_cl(_g1h, &pss, NULL); |
3979
4dfb2df418f2
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diff
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|
5523 |
4dfb2df418f2
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diff
changeset
|
5524 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
6725
da91efe96a93
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coleenp
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6629
diff
changeset
|
5525 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
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diff
changeset
|
5526 |
4dfb2df418f2
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diff
changeset
|
5527 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5528 // We also need to mark copied objects. |
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diff
changeset
|
5529 copy_non_heap_cl = ©_mark_non_heap_cl; |
6725
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diff
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|
5530 copy_metadata_cl = ©_mark_metadata_cl; |
3979
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diff
changeset
|
5531 } |
4dfb2df418f2
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diff
changeset
|
5532 |
4dfb2df418f2
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diff
changeset
|
5533 // Is alive closure |
4dfb2df418f2
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diff
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|
5534 G1AlwaysAliveClosure always_alive(_g1h); |
4dfb2df418f2
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diff
changeset
|
5535 |
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diff
changeset
|
5536 // Copying keep alive closure. Applied to referent objects that need |
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diff
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|
5537 // to be copied. |
6725
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6629
diff
changeset
|
5538 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_metadata_cl, &pss); |
3979
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diff
changeset
|
5539 |
4dfb2df418f2
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diff
changeset
|
5540 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
4dfb2df418f2
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|
5541 |
4728
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diff
changeset
|
5542 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
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diff
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|
5543 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
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changeset
|
5544 |
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diff
changeset
|
5545 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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diff
changeset
|
5546 // So this must be true - but assert just in case someone decides to |
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diff
changeset
|
5547 // change the worker ids. |
4728
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jmasa
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diff
changeset
|
5548 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
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diff
changeset
|
5549 assert(!rp->discovery_is_atomic(), "check this code"); |
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diff
changeset
|
5550 |
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diff
changeset
|
5551 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
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jmasa
parents:
4711
diff
changeset
|
5552 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
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changeset
|
5553 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
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changeset
|
5554 |
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|
5555 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
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diff
changeset
|
5556 while (iter.has_next()) { |
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diff
changeset
|
5557 // Since discovery is not atomic for the CM ref processor, we |
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diff
changeset
|
5558 // can see some null referent objects. |
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diff
changeset
|
5559 iter.load_ptrs(DEBUG_ONLY(true)); |
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diff
changeset
|
5560 oop ref = iter.obj(); |
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parents:
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diff
changeset
|
5561 |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5562 // This will filter nulls. |
4dfb2df418f2
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diff
changeset
|
5563 if (iter.is_referent_alive()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5564 iter.make_referent_alive(); |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5565 } |
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6484982: G1: process references during evacuation pauses
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diff
changeset
|
5566 iter.move_to_next(); |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5567 } |
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parents:
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diff
changeset
|
5568 } |
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parents:
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diff
changeset
|
5569 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5570 // Drain the queue - which may cause stealing |
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diff
changeset
|
5571 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
4dfb2df418f2
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diff
changeset
|
5572 drain_queue.do_void(); |
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diff
changeset
|
5573 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
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changeset
|
5574 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5575 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5576 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
5577 |
4dfb2df418f2
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parents:
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diff
changeset
|
5578 // Weak Reference processing during an evacuation pause (part 1). |
6819 | 5579 void G1CollectedHeap::process_discovered_references(uint no_of_gc_workers) { |
3979
4dfb2df418f2
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parents:
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changeset
|
5580 double ref_proc_start = os::elapsedTime(); |
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diff
changeset
|
5581 |
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diff
changeset
|
5582 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
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changeset
|
5583 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
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diff
changeset
|
5584 |
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diff
changeset
|
5585 // Any reference objects, in the collection set, that were 'discovered' |
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diff
changeset
|
5586 // by the CM ref processor should have already been copied (either by |
4dfb2df418f2
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parents:
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diff
changeset
|
5587 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
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parents:
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diff
changeset
|
5588 // by following an RSet entry). |
4dfb2df418f2
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parents:
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diff
changeset
|
5589 // |
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parents:
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diff
changeset
|
5590 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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diff
changeset
|
5591 // reference objects point to may not have been copied: the STW ref |
4dfb2df418f2
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parents:
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diff
changeset
|
5592 // processor would have seen that the reference object had already |
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parents:
3973
diff
changeset
|
5593 // been 'discovered' and would have skipped discovering the reference, |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5594 // but would not have treated the reference object as a regular oop. |
10405 | 5595 // As a result the copy closure would not have been applied to the |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5596 // referent object. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5597 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5598 // We need to explicitly copy these referent objects - the references |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5599 // will be processed at the end of remarking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5600 // |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5601 // We also need to do this copying before we process the reference |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5602 // objects discovered by the STW ref processor in case one of these |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5603 // referents points to another object which is also referenced by an |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5604 // object discovered by the STW ref processor. |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5605 |
4711 | 5606 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
6819 | 5607 no_of_gc_workers == workers()->active_workers(), |
5608 "Need to reset active GC workers"); | |
5609 | |
5610 set_par_threads(no_of_gc_workers); | |
5611 G1ParPreserveCMReferentsTask keep_cm_referents(this, | |
5612 no_of_gc_workers, | |
5613 _task_queues); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5614 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5615 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5616 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5617 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5618 keep_cm_referents.work(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5619 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5620 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5621 set_par_threads(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5622 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5623 // Closure to test whether a referent is alive. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5624 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5625 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5626 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5627 // of JNI refs is serial and performed serially by the current thread |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5628 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5629 // JNI refs. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5630 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5631 // Use only a single queue for this PSS. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5632 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5633 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5634 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5635 // closures while we're actually processing the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5636 // reference objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5637 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5638 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5639 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5640 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5641 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5642 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5643 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5644 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5645 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5646 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5647 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5648 G1ParScanMetadataClosure only_copy_metadata_cl(this, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5649 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5650 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5651 G1ParScanAndMarkMetadataClosure copy_mark_metadata_cl(this, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5652 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5653 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5654 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5655 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5656 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5657 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5658 copy_non_heap_cl = ©_mark_non_heap_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5659 copy_metadata_cl = ©_mark_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5660 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5661 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5662 // Keep alive closure. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5663 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_metadata_cl, &pss); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5664 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5665 // Serial Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5666 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5667 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5668 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5669 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5670 |
10405 | 5671 ReferenceProcessorStats stats; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5672 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5673 // Serial reference processing... |
10405 | 5674 stats = rp->process_discovered_references(&is_alive, |
5675 &keep_alive, | |
5676 &drain_queue, | |
5677 NULL, | |
5678 _gc_timer_stw); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5679 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5680 // Parallel reference processing |
6819 | 5681 assert(rp->num_q() == no_of_gc_workers, "sanity"); |
5682 assert(no_of_gc_workers <= rp->max_num_q(), "sanity"); | |
5683 | |
5684 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, no_of_gc_workers); | |
10405 | 5685 stats = rp->process_discovered_references(&is_alive, |
5686 &keep_alive, | |
5687 &drain_queue, | |
5688 &par_task_executor, | |
5689 _gc_timer_stw); | |
5690 } | |
5691 | |
5692 _gc_tracer_stw->report_gc_reference_stats(stats); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5693 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5694 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5695 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5696 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5697 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
|
5698 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5699 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5700 g1_policy()->phase_times()->record_ref_proc_time(ref_proc_time * 1000.0); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5701 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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changeset
|
5702 |
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6484982: G1: process references during evacuation pauses
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diff
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|
5703 // Weak Reference processing during an evacuation pause (part 2). |
6819 | 5704 void G1CollectedHeap::enqueue_discovered_references(uint no_of_gc_workers) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
5705 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5706 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5707 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5708 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
|
5709 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5710 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5711 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5712 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5713 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5714 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5715 } else { |
10405 | 5716 // Parallel reference enqueueing |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5717 |
6819 | 5718 assert(no_of_gc_workers == workers()->active_workers(), |
5719 "Need to reset active workers"); | |
5720 assert(rp->num_q() == no_of_gc_workers, "sanity"); | |
5721 assert(no_of_gc_workers <= rp->max_num_q(), "sanity"); | |
5722 | |
5723 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, no_of_gc_workers); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5724 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5725 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5726 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5727 rp->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5728 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5729 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5730 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5731 // 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
|
5732 // Should we do that here also? We could, but it is a serial operation |
10405 | 5733 // and could significantly increase the pause time. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5734 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5735 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
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|
5736 g1_policy()->phase_times()->record_ref_enq_time(ref_enq_time * 1000.0); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5737 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5738 |
10405 | 5739 void G1CollectedHeap::evacuate_collection_set(EvacuationInfo& evacuation_info) { |
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5740 _expand_heap_after_alloc_failure = true; |
10405 | 5741 _evacuation_failed = false; |
342 | 5742 |
6629
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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|
5743 // Should G1EvacuationFailureALot be in effect for this GC? |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
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diff
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|
5744 NOT_PRODUCT(set_evacuation_failure_alot_for_current_gc();) |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
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parents:
6628
diff
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|
5745 |
342 | 5746 g1_rem_set()->prepare_for_oops_into_collection_set_do(); |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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10242
diff
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|
5747 |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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parents:
10242
diff
changeset
|
5748 // Disable the hot card cache. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5749 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
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|
5750 hot_card_cache->reset_hot_cache_claimed_index(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
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|
5751 hot_card_cache->set_use_cache(false); |
889 | 5752 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5753 uint n_workers; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5754 if (G1CollectedHeap::use_parallel_gc_threads()) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5755 n_workers = |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5756 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5757 workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5758 Threads::number_of_non_daemon_threads()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5759 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5760 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5761 "If not dynamic should be using all the workers"); |
4711 | 5762 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5763 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5764 } else { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5765 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5766 "Should be the original non-parallel value"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5767 n_workers = 1; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5768 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5769 |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5770 G1ParTask g1_par_task(this, _task_queues); |
342 | 5771 |
5772 init_for_evac_failure(NULL); | |
5773 | |
5774 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
|
5775 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5776 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
|
5777 double start_par_time_sec = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5778 double end_par_time_sec; |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5779 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5780 { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5781 StrongRootsScope srs(this); |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5782 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5783 if (G1CollectedHeap::use_parallel_gc_threads()) { |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5784 // 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
|
5785 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5786 // These tasks use ShareHeap::_process_strong_tasks |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5787 assert(UseDynamicNumberOfGCThreads || |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5788 workers()->active_workers() == workers()->total_workers(), |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5789 "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
|
5790 workers()->run_task(&g1_par_task); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5791 } else { |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5792 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
|
5793 g1_par_task.work(0); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5794 } |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5795 end_par_time_sec = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5796 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5797 // 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
|
5798 // 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
|
5799 // 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
|
5800 // 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
|
5801 // reported parallel time. |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5802 } |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5803 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5804 double par_time_ms = (end_par_time_sec - start_par_time_sec) * 1000.0; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5805 g1_policy()->phase_times()->record_par_time(par_time_ms); |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5806 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5807 double code_root_fixup_time_ms = |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5808 (os::elapsedTime() - end_par_time_sec) * 1000.0; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5809 g1_policy()->phase_times()->record_code_root_fixup_time(code_root_fixup_time_ms); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5810 |
342 | 5811 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5812 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5813 // Process any discovered reference objects - we have |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5814 // to do this _before_ we retire the GC alloc regions |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5815 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5816 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5817 // not copied during the pause. |
6819 | 5818 process_discovered_references(n_workers); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5819 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5820 // Weak root processing. |
342 | 5821 { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5822 G1STWIsAliveClosure is_alive(this); |
342 | 5823 G1KeepAliveClosure keep_alive(this); |
5824 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5825 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5826 |
10405 | 5827 release_gc_alloc_regions(n_workers, evacuation_info); |
342 | 5828 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
|
5829 |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5830 // Reset and re-enable the hot card cache. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5831 // Note the counts for the cards in the regions in the |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5832 // collection set are reset when the collection set is freed. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5833 hot_card_cache->reset_hot_cache(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5834 hot_card_cache->set_use_cache(true); |
342 | 5835 |
12080 | 5836 // Migrate the strong code roots attached to each region in |
5837 // the collection set. Ideally we would like to do this | |
5838 // after we have finished the scanning/evacuation of the | |
5839 // strong code roots for a particular heap region. | |
5840 migrate_strong_code_roots(); | |
5841 | |
5842 if (g1_policy()->during_initial_mark_pause()) { | |
5843 // Reset the claim values set during marking the strong code roots | |
5844 reset_heap_region_claim_values(); | |
5845 } | |
5846 | |
342 | 5847 finalize_for_evac_failure(); |
5848 | |
5849 if (evacuation_failed()) { | |
5850 remove_self_forwarding_pointers(); | |
6629
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5851 |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5852 // Reset the G1EvacuationFailureALot counters and flags |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5853 // Note: the values are reset only when an actual |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5854 // evacuation failure occurs. |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5855 NOT_PRODUCT(reset_evacuation_should_fail();) |
342 | 5856 } |
5857 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5858 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5859 // reference processor's discovered lists. We need to do |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5860 // this after the card table is cleaned (and verified) as |
10405 | 5861 // the act of enqueueing entries on to the pending list |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5862 // will log these updates (and dirty their associated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5863 // cards). We need these updates logged to update any |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5864 // RSets. |
6819 | 5865 enqueue_discovered_references(n_workers); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
5866 |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
5867 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
5868 RedirtyLoggedCardTableEntryFastClosure redirty; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
5869 dirty_card_queue_set().set_closure(&redirty); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
5870 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5871 |
5872 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5873 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
5874 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
5875 } |
342 | 5876 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5877 } | |
5878 | |
2173 | 5879 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5880 size_t* pre_used, |
5881 FreeRegionList* free_list, | |
4072 | 5882 OldRegionSet* old_proxy_set, |
2152 | 5883 HumongousRegionSet* humongous_proxy_set, |
2173 | 5884 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5885 bool par) { |
5886 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5887 if (hr->isHumongous()) { | |
5888 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5889 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5890 } else { | |
4072 | 5891 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5892 free_region(hr, pre_used, free_list, par); |
342 | 5893 } |
2173 | 5894 } else { |
5895 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5896 } |
5897 } | |
5898 | |
2152 | 5899 void G1CollectedHeap::free_region(HeapRegion* hr, |
5900 size_t* pre_used, | |
5901 FreeRegionList* free_list, | |
5902 bool par) { | |
5903 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5904 assert(!hr->is_empty(), "the region should not be empty"); | |
5905 assert(free_list != NULL, "pre-condition"); | |
5906 | |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
5907 // Clear the card counts for this region. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
5908 // Note: we only need to do this if the region is not young |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
5909 // (since we don't refine cards in young regions). |
194f52aa2f23
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|
5910 if (!hr->is_young()) { |
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|
5911 _cg1r->hot_card_cache()->reset_card_counts(hr); |
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diff
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|
5912 } |
2152 | 5913 *pre_used += hr->used(); |
5914 hr->hr_clear(par, true /* clear_space */); | |
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
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|
5915 free_list->add_as_head(hr); |
2152 | 5916 } |
5917 | |
5918 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5919 size_t* pre_used, | |
5920 FreeRegionList* free_list, | |
5921 HumongousRegionSet* humongous_proxy_set, | |
5922 bool par) { | |
5923 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5924 assert(free_list != NULL, "pre-condition"); | |
5925 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5926 | |
5927 size_t hr_used = hr->used(); | |
5928 size_t hr_capacity = hr->capacity(); | |
5929 size_t hr_pre_used = 0; | |
5930 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
6254
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7114678: G1: various small fixes, code cleanup, and refactoring
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|
5931 // We need to read this before we make the region non-humongous, |
a2f7274eb6ef
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|
5932 // otherwise the information will be gone. |
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7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
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diff
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|
5933 uint last_index = hr->last_hc_index(); |
2152 | 5934 hr->set_notHumongous(); |
5935 free_region(hr, &hr_pre_used, free_list, par); | |
5936 | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
5937 uint i = hr->hrs_index() + 1; |
6254
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|
5938 while (i < last_index) { |
3766 | 5939 HeapRegion* curr_hr = region_at(i); |
6254
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diff
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|
5940 assert(curr_hr->continuesHumongous(), "invariant"); |
2152 | 5941 curr_hr->set_notHumongous(); |
5942 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5943 i += 1; | |
5944 } | |
5945 assert(hr_pre_used == hr_used, | |
5946 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5947 "should be the same", hr_pre_used, hr_used)); | |
5948 *pre_used += hr_pre_used; | |
5949 } | |
5950 | |
5951 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5952 FreeRegionList* free_list, | |
4072 | 5953 OldRegionSet* old_proxy_set, |
2152 | 5954 HumongousRegionSet* humongous_proxy_set, |
5955 bool par) { | |
5956 if (pre_used > 0) { | |
5957 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5958 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5959 assert(_summary_bytes_used >= pre_used, |
5960 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5961 "should be >= pre_used: "SIZE_FORMAT, | |
5962 _summary_bytes_used, pre_used)); | |
342 | 5963 _summary_bytes_used -= pre_used; |
2152 | 5964 } |
5965 if (free_list != NULL && !free_list->is_empty()) { | |
5966 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
2432
455328d90876
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|
5967 _free_list.add_as_head(free_list); |
2152 | 5968 } |
4072 | 5969 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5970 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5971 _old_set.update_from_proxy(old_proxy_set); | |
5972 } | |
2152 | 5973 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5974 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5975 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5976 } |
5977 } | |
5978 | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
5979 class G1ParCleanupCTTask : public AbstractGangTask { |
12343 | 5980 G1SATBCardTableModRefBS* _ct_bs; |
796
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diff
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|
5981 G1CollectedHeap* _g1h; |
940
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|
5982 HeapRegion* volatile _su_head; |
796
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6819065: G1: eliminate high serial card table clearing time
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diff
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|
5983 public: |
12343 | 5984 G1ParCleanupCTTask(G1SATBCardTableModRefBS* ct_bs, |
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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|
5985 G1CollectedHeap* g1h) : |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5986 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
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|
5987 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
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|
5988 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5989 void work(uint worker_id) { |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5990 HeapRegion* r; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
5991 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
5992 clear_cards(r); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5993 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5994 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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diff
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|
5995 |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5996 void clear_cards(HeapRegion* r) { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5997 // Cards of the survivors should have already been dirtied. |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5998 if (!r->is_survivor()) { |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
5999 _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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diff
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|
6000 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
6001 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
6002 }; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
6003 |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6004 #ifndef PRODUCT |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6005 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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3293
diff
changeset
|
6006 G1CollectedHeap* _g1h; |
12343 | 6007 G1SATBCardTableModRefBS* _ct_bs; |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6008 public: |
12343 | 6009 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, G1SATBCardTableModRefBS* ct_bs) |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
6010 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6011 virtual bool doHeapRegion(HeapRegion* r) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
6012 if (r->is_survivor()) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
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|
6013 _g1h->verify_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6014 } else { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
6015 _g1h->verify_not_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6016 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6017 return false; |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
6018 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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diff
changeset
|
6019 }; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6020 |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
6021 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
6022 // All of the region should be clean. |
12343 | 6023 G1SATBCardTableModRefBS* ct_bs = g1_barrier_set(); |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
6024 MemRegion mr(hr->bottom(), hr->end()); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
6025 ct_bs->verify_not_dirty_region(mr); |
063382f9b575
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|
6026 } |
063382f9b575
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|
6027 |
063382f9b575
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diff
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|
6028 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
063382f9b575
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|
6029 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
063382f9b575
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diff
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|
6030 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
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diff
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|
6031 // retires each region and replaces it with a new one will do a |
063382f9b575
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diff
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|
6032 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
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|
6033 // not dirty that area (one less thing to have to do while holding |
063382f9b575
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|
6034 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
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|
6035 // is dirty. |
12343 | 6036 G1SATBCardTableModRefBS* ct_bs = g1_barrier_set(); |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
6037 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
12835
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
parents:
12345
diff
changeset
|
6038 if (hr->is_young()) { |
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
parents:
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diff
changeset
|
6039 ct_bs->verify_g1_young_region(mr); |
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
parents:
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diff
changeset
|
6040 } else { |
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
parents:
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diff
changeset
|
6041 ct_bs->verify_dirty_region(mr); |
69944b868a32
8014555: G1: Memory ordering problem with Conc refinement and card marking
mgerdin
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diff
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|
6042 } |
3317
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|
6043 } |
063382f9b575
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|
6044 |
2433
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2432
diff
changeset
|
6045 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
12343 | 6046 G1SATBCardTableModRefBS* ct_bs = g1_barrier_set(); |
2433
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|
6047 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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|
6048 verify_dirty_region(hr); |
2433
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6049 } |
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|
6050 } |
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|
6051 |
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|
6052 void G1CollectedHeap::verify_dirty_young_regions() { |
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6053 verify_dirty_young_list(_young_list->first_region()); |
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|
6054 } |
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|
6055 #endif |
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|
6056 |
342 | 6057 void G1CollectedHeap::cleanUpCardTable() { |
12343 | 6058 G1SATBCardTableModRefBS* ct_bs = g1_barrier_set(); |
342 | 6059 double start = os::elapsedTime(); |
6060 | |
4023 | 6061 { |
6062 // Iterate over the dirty cards region list. | |
6063 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
6064 | |
4711 | 6065 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6066 set_par_threads(); | |
4023 | 6067 workers()->run_task(&cleanup_task); |
6068 set_par_threads(0); | |
6069 } else { | |
6070 while (_dirty_cards_region_list) { | |
6071 HeapRegion* r = _dirty_cards_region_list; | |
6072 cleanup_task.clear_cards(r); | |
6073 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
6074 if (_dirty_cards_region_list == r) { | |
6075 // The last region. | |
6076 _dirty_cards_region_list = NULL; | |
6077 } | |
6078 r->set_next_dirty_cards_region(NULL); | |
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|
6079 } |
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|
6080 } |
4023 | 6081 #ifndef PRODUCT |
6082 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
6083 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
6084 heap_region_iterate(&cleanup_verifier); | |
6085 } | |
6086 #endif | |
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6087 } |
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6088 |
342 | 6089 double elapsed = os::elapsedTime() - start; |
6219
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|
6090 g1_policy()->phase_times()->record_clear_ct_time(elapsed * 1000.0); |
342 | 6091 } |
6092 | |
10405 | 6093 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info) { |
2152 | 6094 size_t pre_used = 0; |
6095 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
6096 | |
342 | 6097 double young_time_ms = 0.0; |
6098 double non_young_time_ms = 0.0; | |
6099 | |
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6100 // Since the collection set is a superset of the the young list, |
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6101 // all we need to do to clear the young list is clear its |
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6102 // head and length, and unlink any young regions in the code below |
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6103 _young_list->clear(); |
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6104 |
342 | 6105 G1CollectorPolicy* policy = g1_policy(); |
6106 | |
6107 double start_sec = os::elapsedTime(); | |
6108 bool non_young = true; | |
6109 | |
6110 HeapRegion* cur = cs_head; | |
6111 int age_bound = -1; | |
6112 size_t rs_lengths = 0; | |
6113 | |
6114 while (cur != NULL) { | |
2361 | 6115 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 6116 if (non_young) { |
6117 if (cur->is_young()) { | |
6118 double end_sec = os::elapsedTime(); | |
6119 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
6120 non_young_time_ms += elapsed_ms; | |
6121 | |
6122 start_sec = os::elapsedTime(); | |
6123 non_young = false; | |
6124 } | |
6125 } else { | |
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6126 if (!cur->is_young()) { |
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6127 double end_sec = os::elapsedTime(); |
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6128 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
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6129 young_time_ms += elapsed_ms; |
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6130 |
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6131 start_sec = os::elapsedTime(); |
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6132 non_young = true; |
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6133 } |
342 | 6134 } |
6135 | |
6136 rs_lengths += cur->rem_set()->occupied(); | |
6137 | |
6138 HeapRegion* next = cur->next_in_collection_set(); | |
6139 assert(cur->in_collection_set(), "bad CS"); | |
6140 cur->set_next_in_collection_set(NULL); | |
6141 cur->set_in_collection_set(false); | |
6142 | |
6143 if (cur->is_young()) { | |
6144 int index = cur->young_index_in_cset(); | |
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6145 assert(index != -1, "invariant"); |
6010
720b6a76dd9d
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6146 assert((uint) index < policy->young_cset_region_length(), "invariant"); |
342 | 6147 size_t words_survived = _surviving_young_words[index]; |
6148 cur->record_surv_words_in_group(words_survived); | |
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6149 |
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6150 // At this point the we have 'popped' cur from the collection set |
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6151 // (linked via next_in_collection_set()) but it is still in the |
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6152 // young list (linked via next_young_region()). Clear the |
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6153 // _next_young_region field. |
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6154 cur->set_next_young_region(NULL); |
342 | 6155 } else { |
6156 int index = cur->young_index_in_cset(); | |
4090
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|
6157 assert(index == -1, "invariant"); |
342 | 6158 } |
6159 | |
6160 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
6161 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
6162 "invariant" ); | |
6163 | |
6164 if (!cur->evacuation_failed()) { | |
4097
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|
6165 MemRegion used_mr = cur->used_region(); |
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|
6166 |
342 | 6167 // And the region is empty. |
4097
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|
6168 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
2152 | 6169 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 6170 } else { |
6171 cur->uninstall_surv_rate_group(); | |
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|
6172 if (cur->is_young()) { |
342 | 6173 cur->set_young_index_in_cset(-1); |
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|
6174 } |
342 | 6175 cur->set_not_young(); |
6176 cur->set_evacuation_failed(false); | |
4072 | 6177 // The region is now considered to be old. |
6178 _old_set.add(cur); | |
10405 | 6179 evacuation_info.increment_collectionset_used_after(cur->used()); |
342 | 6180 } |
6181 cur = next; | |
6182 } | |
6183 | |
10405 | 6184 evacuation_info.set_regions_freed(local_free_list.length()); |
342 | 6185 policy->record_max_rs_lengths(rs_lengths); |
6186 policy->cset_regions_freed(); | |
6187 | |
6188 double end_sec = os::elapsedTime(); | |
6189 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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|
6190 |
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|
6191 if (non_young) { |
342 | 6192 non_young_time_ms += elapsed_ms; |
4097
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|
6193 } else { |
342 | 6194 young_time_ms += elapsed_ms; |
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|
6195 } |
342 | 6196 |
2152 | 6197 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 6198 NULL /* old_proxy_set */, |
2152 | 6199 NULL /* humongous_proxy_set */, |
6200 false /* par */); | |
6219
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7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6188
diff
changeset
|
6201 policy->phase_times()->record_young_free_cset_time_ms(young_time_ms); |
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diff
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|
6202 policy->phase_times()->record_non_young_free_cset_time_ms(non_young_time_ms); |
342 | 6203 } |
6204 | |
1394
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|
6205 // This routine is similar to the above but does not record |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
6206 // any policy statistics or update free lists; we are abandoning |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
6207 // the current incremental collection set in preparation of a |
1316cec51b4d
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|
6208 // full collection. After the full GC we will start to build up |
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|
6209 // the incremental collection set again. |
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|
6210 // This is only called when we're doing a full collection |
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|
6211 // and is immediately followed by the tearing down of the young list. |
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|
6212 |
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|
6213 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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|
6214 HeapRegion* cur = cs_head; |
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|
6215 |
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|
6216 while (cur != NULL) { |
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|
6217 HeapRegion* next = cur->next_in_collection_set(); |
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|
6218 assert(cur->in_collection_set(), "bad CS"); |
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|
6219 cur->set_next_in_collection_set(NULL); |
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|
6220 cur->set_in_collection_set(false); |
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|
6221 cur->set_young_index_in_cset(-1); |
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|
6222 cur = next; |
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|
6223 } |
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|
6224 } |
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|
6225 |
2152 | 6226 void G1CollectedHeap::set_free_regions_coming() { |
6227 if (G1ConcRegionFreeingVerbose) { | |
6228 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
6229 "setting free regions coming"); | |
6230 } | |
6231 | |
6232 assert(!free_regions_coming(), "pre-condition"); | |
6233 _free_regions_coming = true; | |
342 | 6234 } |
6235 | |
2152 | 6236 void G1CollectedHeap::reset_free_regions_coming() { |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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|
6237 assert(free_regions_coming(), "pre-condition"); |
eff609af17d7
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|
6238 |
2152 | 6239 { |
6240 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6241 _free_regions_coming = false; | |
6242 SecondaryFreeList_lock->notify_all(); | |
6243 } | |
6244 | |
6245 if (G1ConcRegionFreeingVerbose) { | |
6246 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
6247 "reset free regions coming"); | |
342 | 6248 } |
6249 } | |
6250 | |
2152 | 6251 void G1CollectedHeap::wait_while_free_regions_coming() { |
6252 // Most of the time we won't have to wait, so let's do a quick test | |
6253 // first before we take the lock. | |
6254 if (!free_regions_coming()) { | |
6255 return; | |
6256 } | |
6257 | |
6258 if (G1ConcRegionFreeingVerbose) { | |
6259 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
6260 "waiting for free regions"); | |
342 | 6261 } |
6262 | |
6263 { | |
2152 | 6264 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
6265 while (free_regions_coming()) { | |
6266 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 6267 } |
2152 | 6268 } |
6269 | |
6270 if (G1ConcRegionFreeingVerbose) { | |
6271 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
6272 "done waiting for free regions"); | |
6273 } | |
342 | 6274 } |
6275 | |
6276 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
6277 assert(heap_lock_held_for_gc(), | |
6278 "the heap lock should already be held by or for this thread"); | |
6279 _young_list->push_region(hr); | |
6280 } | |
6281 | |
6282 class NoYoungRegionsClosure: public HeapRegionClosure { | |
6283 private: | |
6284 bool _success; | |
6285 public: | |
6286 NoYoungRegionsClosure() : _success(true) { } | |
6287 bool doHeapRegion(HeapRegion* r) { | |
6288 if (r->is_young()) { | |
6289 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
6290 r->bottom(), r->end()); | |
6291 _success = false; | |
6292 } | |
6293 return false; | |
6294 } | |
6295 bool success() { return _success; } | |
6296 }; | |
6297 | |
1394
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6298 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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|
6299 bool ret = _young_list->check_list_empty(check_sample); |
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|
6300 |
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|
6301 if (check_heap) { |
342 | 6302 NoYoungRegionsClosure closure; |
6303 heap_region_iterate(&closure); | |
6304 ret = ret && closure.success(); | |
6305 } | |
6306 | |
6307 return ret; | |
6308 } | |
6309 | |
4072 | 6310 class TearDownRegionSetsClosure : public HeapRegionClosure { |
6311 private: | |
6312 OldRegionSet *_old_set; | |
2152 | 6313 |
342 | 6314 public: |
4072 | 6315 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 6316 |
342 | 6317 bool doHeapRegion(HeapRegion* r) { |
4072 | 6318 if (r->is_empty()) { |
6319 // We ignore empty regions, we'll empty the free list afterwards | |
6320 } else if (r->is_young()) { | |
6321 // We ignore young regions, we'll empty the young list afterwards | |
6322 } else if (r->isHumongous()) { | |
6323 // We ignore humongous regions, we're not tearing down the | |
6324 // humongous region set | |
342 | 6325 } else { |
4072 | 6326 // The rest should be old |
6327 _old_set->remove(r); | |
342 | 6328 } |
6329 return false; | |
6330 } | |
6331 | |
4072 | 6332 ~TearDownRegionSetsClosure() { |
6333 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 6334 } |
342 | 6335 }; |
6336 | |
4072 | 6337 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
6338 assert_at_safepoint(true /* should_be_vm_thread */); | |
6339 | |
6340 if (!free_list_only) { | |
6341 TearDownRegionSetsClosure cl(&_old_set); | |
6342 heap_region_iterate(&cl); | |
6343 | |
6344 // Need to do this after the heap iteration to be able to | |
6345 // recognize the young regions and ignore them during the iteration. | |
6346 _young_list->empty_list(); | |
6347 } | |
6348 _free_list.remove_all(); | |
6349 } | |
6350 | |
6351 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
6352 private: | |
6353 bool _free_list_only; | |
6354 OldRegionSet* _old_set; | |
6355 FreeRegionList* _free_list; | |
6356 size_t _total_used; | |
6357 | |
6358 public: | |
6359 RebuildRegionSetsClosure(bool free_list_only, | |
6360 OldRegionSet* old_set, FreeRegionList* free_list) : | |
6361 _free_list_only(free_list_only), | |
6362 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
6363 assert(_free_list->is_empty(), "pre-condition"); | |
6364 if (!free_list_only) { | |
6365 assert(_old_set->is_empty(), "pre-condition"); | |
6366 } | |
6367 } | |
6368 | |
6369 bool doHeapRegion(HeapRegion* r) { | |
6370 if (r->continuesHumongous()) { | |
6371 return false; | |
6372 } | |
6373 | |
6374 if (r->is_empty()) { | |
6375 // Add free regions to the free list | |
6376 _free_list->add_as_tail(r); | |
6377 } else if (!_free_list_only) { | |
6378 assert(!r->is_young(), "we should not come across young regions"); | |
6379 | |
6380 if (r->isHumongous()) { | |
6381 // We ignore humongous regions, we left the humongous set unchanged | |
6382 } else { | |
6383 // The rest should be old, add them to the old set | |
6384 _old_set->add(r); | |
6385 } | |
6386 _total_used += r->used(); | |
6387 } | |
6388 | |
6389 return false; | |
6390 } | |
6391 | |
6392 size_t total_used() { | |
6393 return _total_used; | |
6394 } | |
6395 }; | |
6396 | |
6397 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
6398 assert_at_safepoint(true /* should_be_vm_thread */); | |
6399 | |
6400 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
6401 heap_region_iterate(&cl); | |
6402 | |
6403 if (!free_list_only) { | |
6404 _summary_bytes_used = cl.total_used(); | |
6405 } | |
6406 assert(_summary_bytes_used == recalculate_used(), | |
6407 err_msg("inconsistent _summary_bytes_used, " | |
6408 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
6409 _summary_bytes_used, recalculate_used())); | |
342 | 6410 } |
6411 | |
6412 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
6413 _refine_cte_cl->set_concurrent(concurrent); | |
6414 } | |
6415 | |
6416 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
6417 HeapRegion* hr = heap_region_containing(p); | |
6418 if (hr == NULL) { | |
6725
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6964458: Reimplement class meta-data storage to use native memory
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6419 return false; |
342 | 6420 } else { |
6421 return hr->is_in(p); | |
6422 } | |
6423 } | |
2152 | 6424 |
3830
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|
6425 // Methods for the mutator alloc region |
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6426 |
2433
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|
6427 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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|
6428 bool force) { |
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|
6429 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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6430 assert(!force || g1_policy()->can_expand_young_list(), |
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6431 "if force is true we should be able to expand the young list"); |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
6432 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
6433 if (force || !young_list_full) { |
2433
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6434 HeapRegion* new_alloc_region = new_region(word_size, |
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|
6435 false /* do_expand */); |
abdfc822206f
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|
6436 if (new_alloc_region != NULL) { |
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|
6437 set_region_short_lived_locked(new_alloc_region); |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
6438 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
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|
6439 return new_alloc_region; |
abdfc822206f
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|
6440 } |
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|
6441 } |
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|
6442 return NULL; |
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|
6443 } |
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|
6444 |
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|
6445 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
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|
6446 size_t allocated_bytes) { |
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|
6447 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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|
6448 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
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|
6449 |
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|
6450 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
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|
6451 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
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3777
diff
changeset
|
6452 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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3979
diff
changeset
|
6453 // 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
|
6454 // instead of when it's allocated, since this is the point that its |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
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diff
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|
6455 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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diff
changeset
|
6456 g1mm()->update_eden_size(); |
2433
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|
6457 } |
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|
6458 |
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|
6459 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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|
6460 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
6461 return _g1h->new_mutator_alloc_region(word_size, force); |
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|
6462 } |
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|
6463 |
4095
bca17e38de00
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|
6464 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6465 // Don't change the number of workers. Use the value previously set |
bca17e38de00
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diff
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|
6466 // in the workgroup. |
4711 | 6467 assert(G1CollectedHeap::use_parallel_gc_threads(), "shouldn't be here otherwise"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
6468 uint n_workers = workers()->active_workers(); |
4711 | 6469 assert(UseDynamicNumberOfGCThreads || |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
6470 n_workers == workers()->total_workers(), |
bca17e38de00
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diff
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|
6471 "Otherwise should be using the total number of workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6472 if (n_workers == 0) { |
bca17e38de00
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4090
diff
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|
6473 assert(false, "Should have been set in prior evacuation pause."); |
bca17e38de00
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|
6474 n_workers = ParallelGCThreads; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6475 workers()->set_active_workers(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
6476 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6477 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
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|
6478 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
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diff
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|
6479 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6480 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6481 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
6482 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6483 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
6484 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6485 // Methods for the GC alloc regions |
f44782f04dd4
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diff
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|
6486 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6487 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
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|
6488 uint count, |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6489 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6490 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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|
6491 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6492 if (count < g1_policy()->max_regions(ap)) { |
f44782f04dd4
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diff
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|
6493 HeapRegion* new_alloc_region = new_region(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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|
6494 true /* do_expand */); |
f44782f04dd4
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diff
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|
6495 if (new_alloc_region != NULL) { |
f44782f04dd4
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3824
diff
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|
6496 // We really only need to do this for old regions given that we |
f44782f04dd4
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3824
diff
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|
6497 // should never scan survivors. But it doesn't hurt to do it |
f44782f04dd4
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diff
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|
6498 // for survivors too. |
f44782f04dd4
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changeset
|
6499 new_alloc_region->set_saved_mark(); |
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|
6500 if (ap == GCAllocForSurvived) { |
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|
6501 new_alloc_region->set_survivor(); |
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|
6502 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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|
6503 } else { |
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|
6504 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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|
6505 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
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|
6506 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
6507 new_alloc_region->note_start_of_copying(during_im); |
3830
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|
6508 return new_alloc_region; |
f44782f04dd4
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diff
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|
6509 } else { |
f44782f04dd4
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|
6510 g1_policy()->note_alloc_region_limit_reached(ap); |
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|
6511 } |
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|
6512 } |
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|
6513 return NULL; |
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diff
changeset
|
6514 } |
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|
6515 |
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|
6516 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
f44782f04dd4
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|
6517 size_t allocated_bytes, |
f44782f04dd4
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diff
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|
6518 GCAllocPurpose ap) { |
4787
2ace1c4ee8da
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4785
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changeset
|
6519 bool during_im = g1_policy()->during_initial_mark_pause(); |
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4785
diff
changeset
|
6520 alloc_region->note_end_of_copying(during_im); |
3830
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|
6521 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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|
6522 if (ap == GCAllocForSurvived) { |
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diff
changeset
|
6523 young_list()->add_survivor_region(alloc_region); |
4072 | 6524 } else { |
6525 _old_set.add(alloc_region); | |
3830
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|
6526 } |
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|
6527 _hr_printer.retire(alloc_region); |
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6528 } |
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6529 |
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6530 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6531 bool force) { |
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6532 assert(!force, "not supported for GC alloc regions"); |
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6533 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6534 } |
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6535 |
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6536 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6537 size_t allocated_bytes) { |
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6538 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6539 GCAllocForSurvived); |
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6540 } |
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6541 |
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6542 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6543 bool force) { |
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6544 assert(!force, "not supported for GC alloc regions"); |
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6545 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6546 } |
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6547 |
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6548 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6549 size_t allocated_bytes) { |
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6550 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6551 GCAllocForTenured); |
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6552 } |
2433
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6553 // Heap region set verification |
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6554 |
2152 | 6555 class VerifyRegionListsClosure : public HeapRegionClosure { |
6556 private: | |
4072 | 6557 FreeRegionList* _free_list; |
6558 OldRegionSet* _old_set; | |
2152 | 6559 HumongousRegionSet* _humongous_set; |
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6560 uint _region_count; |
2152 | 6561 |
6562 public: | |
4072 | 6563 VerifyRegionListsClosure(OldRegionSet* old_set, |
6564 HumongousRegionSet* humongous_set, | |
2152 | 6565 FreeRegionList* free_list) : |
4072 | 6566 _old_set(old_set), _humongous_set(humongous_set), |
6567 _free_list(free_list), _region_count(0) { } | |
2152 | 6568 |
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6569 uint region_count() { return _region_count; } |
2152 | 6570 |
6571 bool doHeapRegion(HeapRegion* hr) { | |
6572 _region_count += 1; | |
6573 | |
6574 if (hr->continuesHumongous()) { | |
6575 return false; | |
6576 } | |
6577 | |
6578 if (hr->is_young()) { | |
6579 // TODO | |
6580 } else if (hr->startsHumongous()) { | |
6581 _humongous_set->verify_next_region(hr); | |
6582 } else if (hr->is_empty()) { | |
6583 _free_list->verify_next_region(hr); | |
4072 | 6584 } else { |
6585 _old_set->verify_next_region(hr); | |
2152 | 6586 } |
6587 return false; | |
6588 } | |
6589 }; | |
6590 | |
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6591 HeapRegion* G1CollectedHeap::new_heap_region(uint hrs_index, |
3766 | 6592 HeapWord* bottom) { |
6593 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6594 MemRegion mr(bottom, end); | |
6595 assert(_g1_reserved.contains(mr), "invariant"); | |
6596 // This might return NULL if the allocation fails | |
6754
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6597 return new HeapRegion(hrs_index, _bot_shared, mr); |
3766 | 6598 } |
6599 | |
2152 | 6600 void G1CollectedHeap::verify_region_sets() { |
6601 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6602 | |
6603 // First, check the explicit lists. | |
6604 _free_list.verify(); | |
6605 { | |
6606 // Given that a concurrent operation might be adding regions to | |
6607 // the secondary free list we have to take the lock before | |
6608 // verifying it. | |
6609 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6610 _secondary_free_list.verify(); | |
6611 } | |
4072 | 6612 _old_set.verify(); |
2152 | 6613 _humongous_set.verify(); |
6614 | |
6615 // If a concurrent region freeing operation is in progress it will | |
6616 // be difficult to correctly attributed any free regions we come | |
6617 // across to the correct free list given that they might belong to | |
6618 // one of several (free_list, secondary_free_list, any local lists, | |
6619 // etc.). So, if that's the case we will skip the rest of the | |
6620 // verification operation. Alternatively, waiting for the concurrent | |
6621 // operation to complete will have a non-trivial effect on the GC's | |
6622 // operation (no concurrent operation will last longer than the | |
6623 // interval between two calls to verification) and it might hide | |
6624 // any issues that we would like to catch during testing. | |
6625 if (free_regions_coming()) { | |
6626 return; | |
6627 } | |
6628 | |
2361 | 6629 // Make sure we append the secondary_free_list on the free_list so |
6630 // that all free regions we will come across can be safely | |
6631 // attributed to the free_list. | |
6632 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6633 |
6634 // Finally, make sure that the region accounting in the lists is | |
6635 // consistent with what we see in the heap. | |
4072 | 6636 _old_set.verify_start(); |
2152 | 6637 _humongous_set.verify_start(); |
6638 _free_list.verify_start(); | |
6639 | |
4072 | 6640 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6641 heap_region_iterate(&cl); |
6642 | |
4072 | 6643 _old_set.verify_end(); |
2152 | 6644 _humongous_set.verify_end(); |
6645 _free_list.verify_end(); | |
342 | 6646 } |
12080 | 6647 |
6648 // Optimized nmethod scanning | |
6649 | |
6650 class RegisterNMethodOopClosure: public OopClosure { | |
6651 G1CollectedHeap* _g1h; | |
6652 nmethod* _nm; | |
6653 | |
6654 template <class T> void do_oop_work(T* p) { | |
6655 T heap_oop = oopDesc::load_heap_oop(p); | |
6656 if (!oopDesc::is_null(heap_oop)) { | |
6657 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6658 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
6659 assert(!hr->isHumongous(), "code root in humongous region?"); | |
6660 | |
6661 // HeapRegion::add_strong_code_root() avoids adding duplicate | |
6662 // entries but having duplicates is OK since we "mark" nmethods | |
6663 // as visited when we scan the strong code root lists during the GC. | |
6664 hr->add_strong_code_root(_nm); | |
6665 assert(hr->rem_set()->strong_code_roots_list_contains(_nm), "add failed?"); | |
6666 } | |
6667 } | |
6668 | |
6669 public: | |
6670 RegisterNMethodOopClosure(G1CollectedHeap* g1h, nmethod* nm) : | |
6671 _g1h(g1h), _nm(nm) {} | |
6672 | |
6673 void do_oop(oop* p) { do_oop_work(p); } | |
6674 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6675 }; | |
6676 | |
6677 class UnregisterNMethodOopClosure: public OopClosure { | |
6678 G1CollectedHeap* _g1h; | |
6679 nmethod* _nm; | |
6680 | |
6681 template <class T> void do_oop_work(T* p) { | |
6682 T heap_oop = oopDesc::load_heap_oop(p); | |
6683 if (!oopDesc::is_null(heap_oop)) { | |
6684 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6685 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
6686 assert(!hr->isHumongous(), "code root in humongous region?"); | |
6687 hr->remove_strong_code_root(_nm); | |
6688 assert(!hr->rem_set()->strong_code_roots_list_contains(_nm), "remove failed?"); | |
6689 } | |
6690 } | |
6691 | |
6692 public: | |
6693 UnregisterNMethodOopClosure(G1CollectedHeap* g1h, nmethod* nm) : | |
6694 _g1h(g1h), _nm(nm) {} | |
6695 | |
6696 void do_oop(oop* p) { do_oop_work(p); } | |
6697 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6698 }; | |
6699 | |
6700 void G1CollectedHeap::register_nmethod(nmethod* nm) { | |
6701 CollectedHeap::register_nmethod(nm); | |
6702 | |
6703 guarantee(nm != NULL, "sanity"); | |
6704 RegisterNMethodOopClosure reg_cl(this, nm); | |
6705 nm->oops_do(®_cl); | |
6706 } | |
6707 | |
6708 void G1CollectedHeap::unregister_nmethod(nmethod* nm) { | |
6709 CollectedHeap::unregister_nmethod(nm); | |
6710 | |
6711 guarantee(nm != NULL, "sanity"); | |
6712 UnregisterNMethodOopClosure reg_cl(this, nm); | |
6713 nm->oops_do(®_cl, true); | |
6714 } | |
6715 | |
6716 class MigrateCodeRootsHeapRegionClosure: public HeapRegionClosure { | |
6717 public: | |
6718 bool doHeapRegion(HeapRegion *hr) { | |
6719 assert(!hr->isHumongous(), "humongous region in collection set?"); | |
6720 hr->migrate_strong_code_roots(); | |
6721 return false; | |
6722 } | |
6723 }; | |
6724 | |
6725 void G1CollectedHeap::migrate_strong_code_roots() { | |
6726 MigrateCodeRootsHeapRegionClosure cl; | |
6727 double migrate_start = os::elapsedTime(); | |
6728 collection_set_iterate(&cl); | |
6729 double migration_time_ms = (os::elapsedTime() - migrate_start) * 1000.0; | |
6730 g1_policy()->phase_times()->record_strong_code_root_migration_time(migration_time_ms); | |
6731 } | |
6732 | |
6733 // Mark all the code roots that point into regions *not* in the | |
6734 // collection set. | |
6735 // | |
6736 // Note we do not want to use a "marking" CodeBlobToOopClosure while | |
6737 // walking the the code roots lists of regions not in the collection | |
6738 // set. Suppose we have an nmethod (M) that points to objects in two | |
6739 // separate regions - one in the collection set (R1) and one not (R2). | |
6740 // Using a "marking" CodeBlobToOopClosure here would result in "marking" | |
6741 // nmethod M when walking the code roots for R1. When we come to scan | |
6742 // the code roots for R2, we would see that M is already marked and it | |
6743 // would be skipped and the objects in R2 that are referenced from M | |
6744 // would not be evacuated. | |
6745 | |
6746 class MarkStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
6747 | |
6748 class MarkStrongCodeRootOopClosure: public OopClosure { | |
6749 ConcurrentMark* _cm; | |
6750 HeapRegion* _hr; | |
6751 uint _worker_id; | |
6752 | |
6753 template <class T> void do_oop_work(T* p) { | |
6754 T heap_oop = oopDesc::load_heap_oop(p); | |
6755 if (!oopDesc::is_null(heap_oop)) { | |
6756 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6757 // Only mark objects in the region (which is assumed | |
6758 // to be not in the collection set). | |
6759 if (_hr->is_in(obj)) { | |
6760 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); | |
6761 } | |
6762 } | |
6763 } | |
6764 | |
6765 public: | |
6766 MarkStrongCodeRootOopClosure(ConcurrentMark* cm, HeapRegion* hr, uint worker_id) : | |
6767 _cm(cm), _hr(hr), _worker_id(worker_id) { | |
6768 assert(!_hr->in_collection_set(), "sanity"); | |
6769 } | |
6770 | |
6771 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6772 void do_oop(oop* p) { do_oop_work(p); } | |
6773 }; | |
6774 | |
6775 MarkStrongCodeRootOopClosure _oop_cl; | |
6776 | |
6777 public: | |
6778 MarkStrongCodeRootCodeBlobClosure(ConcurrentMark* cm, HeapRegion* hr, uint worker_id): | |
6779 _oop_cl(cm, hr, worker_id) {} | |
6780 | |
6781 void do_code_blob(CodeBlob* cb) { | |
6782 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
6783 if (nm != NULL) { | |
6784 nm->oops_do(&_oop_cl); | |
6785 } | |
6786 } | |
6787 }; | |
6788 | |
6789 class MarkStrongCodeRootsHRClosure: public HeapRegionClosure { | |
6790 G1CollectedHeap* _g1h; | |
6791 uint _worker_id; | |
6792 | |
6793 public: | |
6794 MarkStrongCodeRootsHRClosure(G1CollectedHeap* g1h, uint worker_id) : | |
6795 _g1h(g1h), _worker_id(worker_id) {} | |
6796 | |
6797 bool doHeapRegion(HeapRegion *hr) { | |
6798 HeapRegionRemSet* hrrs = hr->rem_set(); | |
6799 if (hr->isHumongous()) { | |
6800 // Code roots should never be attached to a humongous region | |
6801 assert(hrrs->strong_code_roots_list_length() == 0, "sanity"); | |
6802 return false; | |
6803 } | |
6804 | |
6805 if (hr->in_collection_set()) { | |
6806 // Don't mark code roots into regions in the collection set here. | |
6807 // They will be marked when we scan them. | |
6808 return false; | |
6809 } | |
6810 | |
6811 MarkStrongCodeRootCodeBlobClosure cb_cl(_g1h->concurrent_mark(), hr, _worker_id); | |
6812 hr->strong_code_roots_do(&cb_cl); | |
6813 return false; | |
6814 } | |
6815 }; | |
6816 | |
6817 void G1CollectedHeap::mark_strong_code_roots(uint worker_id) { | |
6818 MarkStrongCodeRootsHRClosure cl(this, worker_id); | |
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6819 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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6820 heap_region_par_iterate_chunked(&cl, |
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6821 worker_id, |
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6822 workers()->active_workers(), |
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6823 HeapRegion::ParMarkRootClaimValue); |
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6824 } else { |
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6825 heap_region_iterate(&cl); |
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6826 } |
12080 | 6827 } |
6828 | |
6829 class RebuildStrongCodeRootClosure: public CodeBlobClosure { | |
6830 G1CollectedHeap* _g1h; | |
6831 | |
6832 public: | |
6833 RebuildStrongCodeRootClosure(G1CollectedHeap* g1h) : | |
6834 _g1h(g1h) {} | |
6835 | |
6836 void do_code_blob(CodeBlob* cb) { | |
6837 nmethod* nm = (cb != NULL) ? cb->as_nmethod_or_null() : NULL; | |
6838 if (nm == NULL) { | |
6839 return; | |
6840 } | |
6841 | |
6842 if (ScavengeRootsInCode && nm->detect_scavenge_root_oops()) { | |
6843 _g1h->register_nmethod(nm); | |
6844 } | |
6845 } | |
6846 }; | |
6847 | |
6848 void G1CollectedHeap::rebuild_strong_code_roots() { | |
6849 RebuildStrongCodeRootClosure blob_cl(this); | |
6850 CodeCache::blobs_do(&blob_cl); | |
6851 } |