Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 12110:4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.
Reviewed-by: tschatzl, dcubed, brutisso
author | stefank |
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date | Fri, 16 Aug 2013 13:22:32 +0200 |
parents | 9720d338b1d5 |
children | 1624a68007bd |
rev | line source |
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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() : | |
128 _calls(0) | |
129 { | |
130 _g1h = G1CollectedHeap::heap(); | |
131 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
132 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
133 } | |
134 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
135 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
136 _calls++; | |
137 unsigned char* ujb = (unsigned char*)card_ptr; | |
138 int ind = (int)(*ujb); | |
139 _histo[ind]++; | |
140 *card_ptr = -1; | |
141 } | |
142 return true; | |
143 } | |
144 int calls() { return _calls; } | |
145 void print_histo() { | |
146 gclog_or_tty->print_cr("Card table value histogram:"); | |
147 for (int i = 0; i < 256; i++) { | |
148 if (_histo[i] != 0) { | |
149 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
150 } | |
151 } | |
152 } | |
153 }; | |
154 | |
155 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
156 int _calls; | |
157 G1CollectedHeap* _g1h; | |
158 CardTableModRefBS* _ctbs; | |
159 public: | |
160 RedirtyLoggedCardTableEntryClosure() : | |
161 _calls(0) | |
162 { | |
163 _g1h = G1CollectedHeap::heap(); | |
164 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
165 } | |
166 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
167 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
168 _calls++; | |
169 *card_ptr = 0; | |
170 } | |
171 return true; | |
172 } | |
173 int calls() { return _calls; } | |
174 }; | |
175 | |
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176 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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177 public: |
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178 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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179 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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180 return true; |
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181 } |
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182 }; |
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183 |
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184 YoungList::YoungList(G1CollectedHeap* g1h) : |
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185 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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186 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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187 guarantee(check_list_empty(false), "just making sure..."); |
342 | 188 } |
189 | |
190 void YoungList::push_region(HeapRegion *hr) { | |
191 assert(!hr->is_young(), "should not already be young"); | |
192 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
193 | |
194 hr->set_next_young_region(_head); | |
195 _head = hr; | |
196 | |
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197 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 198 ++_length; |
199 } | |
200 | |
201 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 202 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 203 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
204 | |
205 hr->set_next_young_region(_survivor_head); | |
206 if (_survivor_head == NULL) { | |
545 | 207 _survivor_tail = hr; |
342 | 208 } |
209 _survivor_head = hr; | |
210 ++_survivor_length; | |
211 } | |
212 | |
213 void YoungList::empty_list(HeapRegion* list) { | |
214 while (list != NULL) { | |
215 HeapRegion* next = list->get_next_young_region(); | |
216 list->set_next_young_region(NULL); | |
217 list->uninstall_surv_rate_group(); | |
218 list->set_not_young(); | |
219 list = next; | |
220 } | |
221 } | |
222 | |
223 void YoungList::empty_list() { | |
224 assert(check_list_well_formed(), "young list should be well formed"); | |
225 | |
226 empty_list(_head); | |
227 _head = NULL; | |
228 _length = 0; | |
229 | |
230 empty_list(_survivor_head); | |
231 _survivor_head = NULL; | |
545 | 232 _survivor_tail = NULL; |
342 | 233 _survivor_length = 0; |
234 | |
235 _last_sampled_rs_lengths = 0; | |
236 | |
237 assert(check_list_empty(false), "just making sure..."); | |
238 } | |
239 | |
240 bool YoungList::check_list_well_formed() { | |
241 bool ret = true; | |
242 | |
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243 uint length = 0; |
342 | 244 HeapRegion* curr = _head; |
245 HeapRegion* last = NULL; | |
246 while (curr != NULL) { | |
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247 if (!curr->is_young()) { |
342 | 248 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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249 "incorrectly tagged (y: %d, surv: %d)", |
342 | 250 curr->bottom(), curr->end(), |
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251 curr->is_young(), curr->is_survivor()); |
342 | 252 ret = false; |
253 } | |
254 ++length; | |
255 last = curr; | |
256 curr = curr->get_next_young_region(); | |
257 } | |
258 ret = ret && (length == _length); | |
259 | |
260 if (!ret) { | |
261 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
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262 gclog_or_tty->print_cr("### list has %u entries, _length is %u", |
342 | 263 length, _length); |
264 } | |
265 | |
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266 return ret; |
342 | 267 } |
268 | |
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269 bool YoungList::check_list_empty(bool check_sample) { |
342 | 270 bool ret = true; |
271 | |
272 if (_length != 0) { | |
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273 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %u", |
342 | 274 _length); |
275 ret = false; | |
276 } | |
277 if (check_sample && _last_sampled_rs_lengths != 0) { | |
278 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
279 ret = false; | |
280 } | |
281 if (_head != NULL) { | |
282 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
283 ret = false; | |
284 } | |
285 if (!ret) { | |
286 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
287 } | |
288 | |
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289 return ret; |
342 | 290 } |
291 | |
292 void | |
293 YoungList::rs_length_sampling_init() { | |
294 _sampled_rs_lengths = 0; | |
295 _curr = _head; | |
296 } | |
297 | |
298 bool | |
299 YoungList::rs_length_sampling_more() { | |
300 return _curr != NULL; | |
301 } | |
302 | |
303 void | |
304 YoungList::rs_length_sampling_next() { | |
305 assert( _curr != NULL, "invariant" ); | |
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306 size_t rs_length = _curr->rem_set()->occupied(); |
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307 |
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308 _sampled_rs_lengths += rs_length; |
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309 |
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310 // The current region may not yet have been added to the |
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311 // incremental collection set (it gets added when it is |
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312 // retired as the current allocation region). |
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313 if (_curr->in_collection_set()) { |
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314 // Update the collection set policy information for this region |
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315 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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316 } |
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317 |
342 | 318 _curr = _curr->get_next_young_region(); |
319 if (_curr == NULL) { | |
320 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
321 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
322 } | |
323 } | |
324 | |
325 void | |
326 YoungList::reset_auxilary_lists() { | |
327 guarantee( is_empty(), "young list should be empty" ); | |
328 assert(check_list_well_formed(), "young list should be well formed"); | |
329 | |
330 // Add survivor regions to SurvRateGroup. | |
331 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 332 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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333 |
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334 int young_index_in_cset = 0; |
342 | 335 for (HeapRegion* curr = _survivor_head; |
336 curr != NULL; | |
337 curr = curr->get_next_young_region()) { | |
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338 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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339 |
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340 // The region is a non-empty survivor so let's add it to |
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341 // the incremental collection set for the next evacuation |
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342 // pause. |
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343 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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344 young_index_in_cset += 1; |
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345 } |
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346 assert((uint) young_index_in_cset == _survivor_length, "post-condition"); |
342 | 347 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
348 | |
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349 _head = _survivor_head; |
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350 _length = _survivor_length; |
342 | 351 if (_survivor_head != NULL) { |
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352 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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353 assert(_survivor_length > 0, "invariant"); |
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354 _survivor_tail->set_next_young_region(NULL); |
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355 } |
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356 |
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357 // Don't clear the survivor list handles until the start of |
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358 // the next evacuation pause - we need it in order to re-tag |
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359 // the survivor regions from this evacuation pause as 'young' |
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360 // at the start of the next. |
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361 |
545 | 362 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 363 |
364 assert(check_list_well_formed(), "young list should be well formed"); | |
365 } | |
366 | |
367 void YoungList::print() { | |
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368 HeapRegion* lists[] = {_head, _survivor_head}; |
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369 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 370 |
371 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
372 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
373 HeapRegion *curr = lists[list]; | |
374 if (curr == NULL) | |
375 gclog_or_tty->print_cr(" empty"); | |
376 while (curr != NULL) { | |
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377 gclog_or_tty->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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378 HR_FORMAT_PARAMS(curr), |
342 | 379 curr->prev_top_at_mark_start(), |
380 curr->next_top_at_mark_start(), | |
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381 curr->age_in_surv_rate_group_cond()); |
342 | 382 curr = curr->get_next_young_region(); |
383 } | |
384 } | |
385 | |
386 gclog_or_tty->print_cr(""); | |
387 } | |
388 | |
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389 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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390 { |
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391 // Claim the right to put the region on the dirty cards region list |
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392 // by installing a self pointer. |
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393 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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394 if (next == NULL) { |
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395 HeapRegion* res = (HeapRegion*) |
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396 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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397 NULL); |
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398 if (res == NULL) { |
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399 HeapRegion* head; |
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400 do { |
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401 // Put the region to the dirty cards region list. |
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402 head = _dirty_cards_region_list; |
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403 next = (HeapRegion*) |
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404 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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405 if (next == head) { |
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406 assert(hr->get_next_dirty_cards_region() == hr, |
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407 "hr->get_next_dirty_cards_region() != hr"); |
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408 if (next == NULL) { |
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409 // The last region in the list points to itself. |
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410 hr->set_next_dirty_cards_region(hr); |
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411 } else { |
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412 hr->set_next_dirty_cards_region(next); |
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413 } |
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414 } |
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415 } while (next != head); |
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416 } |
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417 } |
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418 } |
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419 |
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420 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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421 { |
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422 HeapRegion* head; |
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423 HeapRegion* hr; |
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424 do { |
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425 head = _dirty_cards_region_list; |
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426 if (head == NULL) { |
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427 return NULL; |
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428 } |
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429 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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430 if (head == new_head) { |
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431 // The last region. |
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432 new_head = NULL; |
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433 } |
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434 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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435 head); |
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436 } while (hr != head); |
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437 assert(hr != NULL, "invariant"); |
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438 hr->set_next_dirty_cards_region(NULL); |
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439 return hr; |
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440 } |
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441 |
342 | 442 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 443 _cg1r->stop(); |
342 | 444 _cmThread->stop(); |
445 } | |
446 | |
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447 #ifdef ASSERT |
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448 // A region is added to the collection set as it is retired |
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449 // so an address p can point to a region which will be in the |
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450 // collection set but has not yet been retired. This method |
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451 // therefore is only accurate during a GC pause after all |
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452 // regions have been retired. It is used for debugging |
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453 // to check if an nmethod has references to objects that can |
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454 // be move during a partial collection. Though it can be |
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455 // inaccurate, it is sufficient for G1 because the conservative |
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456 // implementation of is_scavengable() for G1 will indicate that |
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457 // all nmethods must be scanned during a partial collection. |
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458 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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459 HeapRegion* hr = heap_region_containing(p); |
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460 return hr != NULL && hr->in_collection_set(); |
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461 } |
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462 #endif |
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463 |
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464 // Returns true if the reference points to an object that |
10405 | 465 // can move in an incremental collection. |
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466 bool G1CollectedHeap::is_scavengable(const void* p) { |
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467 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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468 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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469 HeapRegion* hr = heap_region_containing(p); |
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470 if (hr == NULL) { |
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471 // null |
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472 assert(p == NULL, err_msg("Not NULL " PTR_FORMAT ,p)); |
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473 return false; |
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474 } else { |
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475 return !hr->isHumongous(); |
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476 } |
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477 } |
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478 |
342 | 479 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
480 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
481 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
482 | |
483 // Count the dirty cards at the start. | |
484 CountNonCleanMemRegionClosure count1(this); | |
485 ct_bs->mod_card_iterate(&count1); | |
486 int orig_count = count1.n(); | |
487 | |
488 // First clear the logged cards. | |
489 ClearLoggedCardTableEntryClosure clear; | |
490 dcqs.set_closure(&clear); | |
491 dcqs.apply_closure_to_all_completed_buffers(); | |
492 dcqs.iterate_closure_all_threads(false); | |
493 clear.print_histo(); | |
494 | |
495 // Now ensure that there's no dirty cards. | |
496 CountNonCleanMemRegionClosure count2(this); | |
497 ct_bs->mod_card_iterate(&count2); | |
498 if (count2.n() != 0) { | |
499 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
500 count2.n(), orig_count); | |
501 } | |
502 guarantee(count2.n() == 0, "Card table should be clean."); | |
503 | |
504 RedirtyLoggedCardTableEntryClosure redirty; | |
505 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
506 dcqs.apply_closure_to_all_completed_buffers(); | |
507 dcqs.iterate_closure_all_threads(false); | |
508 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
509 clear.calls(), orig_count); | |
510 guarantee(redirty.calls() == clear.calls(), | |
511 "Or else mechanism is broken."); | |
512 | |
513 CountNonCleanMemRegionClosure count3(this); | |
514 ct_bs->mod_card_iterate(&count3); | |
515 if (count3.n() != orig_count) { | |
516 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
517 orig_count, count3.n()); | |
518 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
519 } | |
520 | |
521 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
522 } | |
523 | |
524 // Private class members. | |
525 | |
526 G1CollectedHeap* G1CollectedHeap::_g1h; | |
527 | |
528 // Private methods. | |
529 | |
2152 | 530 HeapRegion* |
2361 | 531 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 532 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
533 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
534 if (!_secondary_free_list.is_empty()) { | |
535 if (G1ConcRegionFreeingVerbose) { | |
536 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
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537 "secondary_free_list has %u entries", |
2152 | 538 _secondary_free_list.length()); |
539 } | |
540 // It looks as if there are free regions available on the | |
541 // secondary_free_list. Let's move them to the free_list and try | |
542 // again to allocate from it. | |
543 append_secondary_free_list(); | |
544 | |
545 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
546 "empty we should have moved at least one entry to the free_list"); | |
547 HeapRegion* res = _free_list.remove_head(); | |
548 if (G1ConcRegionFreeingVerbose) { | |
549 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
550 "allocated "HR_FORMAT" from secondary_free_list", | |
551 HR_FORMAT_PARAMS(res)); | |
552 } | |
553 return res; | |
554 } | |
555 | |
10405 | 556 // Wait here until we get notified either when (a) there are no |
2152 | 557 // more free regions coming or (b) some regions have been moved on |
558 // the secondary_free_list. | |
559 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
560 } | |
561 | |
562 if (G1ConcRegionFreeingVerbose) { | |
563 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
564 "could not allocate from secondary_free_list"); | |
565 } | |
566 return NULL; | |
567 } | |
568 | |
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569 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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570 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 571 "the only time we use this to allocate a humongous region is " |
572 "when we are allocating a single humongous region"); | |
573 | |
574 HeapRegion* res; | |
575 if (G1StressConcRegionFreeing) { | |
576 if (!_secondary_free_list.is_empty()) { | |
577 if (G1ConcRegionFreeingVerbose) { | |
578 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
579 "forced to look at the secondary_free_list"); | |
580 } | |
2361 | 581 res = new_region_try_secondary_free_list(); |
2152 | 582 if (res != NULL) { |
583 return res; | |
584 } | |
585 } | |
586 } | |
587 res = _free_list.remove_head_or_null(); | |
588 if (res == NULL) { | |
589 if (G1ConcRegionFreeingVerbose) { | |
590 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
591 "res == NULL, trying the secondary_free_list"); | |
592 } | |
2361 | 593 res = new_region_try_secondary_free_list(); |
2152 | 594 } |
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595 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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596 // Currently, only attempts to allocate GC alloc regions set |
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597 // do_expand to true. So, we should only reach here during a |
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598 // safepoint. If this assumption changes we might have to |
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599 // reconsider the use of _expand_heap_after_alloc_failure. |
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600 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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601 |
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602 ergo_verbose1(ErgoHeapSizing, |
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603 "attempt heap expansion", |
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604 ergo_format_reason("region allocation request failed") |
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605 ergo_format_byte("allocation request"), |
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606 word_size * HeapWordSize); |
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607 if (expand(word_size * HeapWordSize)) { |
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608 // Given that expand() succeeded in expanding the heap, and we |
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609 // always expand the heap by an amount aligned to the heap |
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610 // region size, the free list should in theory not be empty. So |
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611 // it would probably be OK to use remove_head(). But the extra |
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612 // check for NULL is unlikely to be a performance issue here (we |
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613 // just expanded the heap!) so let's just be conservative and |
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614 // use remove_head_or_null(). |
3766 | 615 res = _free_list.remove_head_or_null(); |
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616 } else { |
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617 _expand_heap_after_alloc_failure = false; |
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618 } |
342 | 619 } |
620 return res; | |
621 } | |
622 | |
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623 uint G1CollectedHeap::humongous_obj_allocate_find_first(uint num_regions, |
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624 size_t word_size) { |
2361 | 625 assert(isHumongous(word_size), "word_size should be humongous"); |
626 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
627 | |
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628 uint first = G1_NULL_HRS_INDEX; |
2152 | 629 if (num_regions == 1) { |
630 // Only one region to allocate, no need to go through the slower | |
10405 | 631 // path. The caller will attempt the expansion if this fails, so |
2152 | 632 // let's not try to expand here too. |
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633 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 634 if (hr != NULL) { |
635 first = hr->hrs_index(); | |
636 } else { | |
3766 | 637 first = G1_NULL_HRS_INDEX; |
2152 | 638 } |
639 } else { | |
640 // We can't allocate humongous regions while cleanupComplete() is | |
641 // running, since some of the regions we find to be empty might not | |
642 // yet be added to the free list and it is not straightforward to | |
643 // know which list they are on so that we can remove them. Note | |
644 // that we only need to do this if we need to allocate more than | |
645 // one region to satisfy the current humongous allocation | |
646 // request. If we are only allocating one region we use the common | |
647 // region allocation code (see above). | |
648 wait_while_free_regions_coming(); | |
2361 | 649 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 650 |
651 if (free_regions() >= num_regions) { | |
3766 | 652 first = _hrs.find_contiguous(num_regions); |
653 if (first != G1_NULL_HRS_INDEX) { | |
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654 for (uint i = first; i < first + num_regions; ++i) { |
3766 | 655 HeapRegion* hr = region_at(i); |
2152 | 656 assert(hr->is_empty(), "sanity"); |
2361 | 657 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 658 hr->set_pending_removal(true); |
659 } | |
660 _free_list.remove_all_pending(num_regions); | |
661 } | |
662 } | |
663 } | |
664 return first; | |
665 } | |
666 | |
2361 | 667 HeapWord* |
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668 G1CollectedHeap::humongous_obj_allocate_initialize_regions(uint first, |
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669 uint num_regions, |
2361 | 670 size_t word_size) { |
3766 | 671 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 672 assert(isHumongous(word_size), "word_size should be humongous"); |
673 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
674 | |
675 // Index of last region in the series + 1. | |
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676 uint last = first + num_regions; |
2361 | 677 |
678 // We need to initialize the region(s) we just discovered. This is | |
679 // a bit tricky given that it can happen concurrently with | |
680 // refinement threads refining cards on these regions and | |
681 // potentially wanting to refine the BOT as they are scanning | |
682 // those cards (this can happen shortly after a cleanup; see CR | |
683 // 6991377). So we have to set up the region(s) carefully and in | |
684 // a specific order. | |
685 | |
686 // The word size sum of all the regions we will allocate. | |
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687 size_t word_size_sum = (size_t) num_regions * HeapRegion::GrainWords; |
2361 | 688 assert(word_size <= word_size_sum, "sanity"); |
689 | |
690 // This will be the "starts humongous" region. | |
3766 | 691 HeapRegion* first_hr = region_at(first); |
2361 | 692 // The header of the new object will be placed at the bottom of |
693 // the first region. | |
694 HeapWord* new_obj = first_hr->bottom(); | |
695 // This will be the new end of the first region in the series that | |
10405 | 696 // should also match the end of the last region in the series. |
2361 | 697 HeapWord* new_end = new_obj + word_size_sum; |
698 // This will be the new top of the first region that will reflect | |
699 // this allocation. | |
700 HeapWord* new_top = new_obj + word_size; | |
701 | |
702 // First, we need to zero the header of the space that we will be | |
703 // allocating. When we update top further down, some refinement | |
704 // threads might try to scan the region. By zeroing the header we | |
705 // ensure that any thread that will try to scan the region will | |
706 // come across the zero klass word and bail out. | |
707 // | |
708 // NOTE: It would not have been correct to have used | |
709 // CollectedHeap::fill_with_object() and make the space look like | |
710 // an int array. The thread that is doing the allocation will | |
711 // later update the object header to a potentially different array | |
712 // type and, for a very short period of time, the klass and length | |
713 // fields will be inconsistent. This could cause a refinement | |
714 // thread to calculate the object size incorrectly. | |
715 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
716 | |
717 // We will set up the first region as "starts humongous". This | |
718 // will also update the BOT covering all the regions to reflect | |
719 // that there is a single object that starts at the bottom of the | |
720 // first region. | |
721 first_hr->set_startsHumongous(new_top, new_end); | |
722 | |
723 // Then, if there are any, we will set up the "continues | |
724 // humongous" regions. | |
725 HeapRegion* hr = NULL; | |
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726 for (uint i = first + 1; i < last; ++i) { |
3766 | 727 hr = region_at(i); |
2361 | 728 hr->set_continuesHumongous(first_hr); |
729 } | |
730 // If we have "continues humongous" regions (hr != NULL), then the | |
731 // end of the last one should match new_end. | |
732 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
733 | |
734 // Up to this point no concurrent thread would have been able to | |
735 // do any scanning on any region in this series. All the top | |
736 // fields still point to bottom, so the intersection between | |
737 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
738 // update the top fields, we'll do a storestore to make sure that | |
739 // no thread sees the update to top before the zeroing of the | |
740 // object header and the BOT initialization. | |
741 OrderAccess::storestore(); | |
742 | |
743 // Now that the BOT and the object header have been initialized, | |
744 // we can update top of the "starts humongous" region. | |
745 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
746 "new_top should be in this region"); | |
747 first_hr->set_top(new_top); | |
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748 if (_hr_printer.is_active()) { |
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749 HeapWord* bottom = first_hr->bottom(); |
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750 HeapWord* end = first_hr->orig_end(); |
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751 if ((first + 1) == last) { |
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752 // the series has a single humongous region |
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753 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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754 } else { |
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755 // the series has more than one humongous regions |
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756 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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757 } |
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758 } |
2361 | 759 |
760 // Now, we will update the top fields of the "continues humongous" | |
761 // regions. The reason we need to do this is that, otherwise, | |
762 // these regions would look empty and this will confuse parts of | |
763 // G1. For example, the code that looks for a consecutive number | |
764 // of empty regions will consider them empty and try to | |
765 // re-allocate them. We can extend is_empty() to also include | |
766 // !continuesHumongous(), but it is easier to just update the top | |
767 // fields here. The way we set top for all regions (i.e., top == | |
768 // end for all regions but the last one, top == new_top for the | |
769 // last one) is actually used when we will free up the humongous | |
770 // region in free_humongous_region(). | |
771 hr = NULL; | |
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772 for (uint i = first + 1; i < last; ++i) { |
3766 | 773 hr = region_at(i); |
2361 | 774 if ((i + 1) == last) { |
775 // last continues humongous region | |
776 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
777 "new_top should fall on this region"); | |
778 hr->set_top(new_top); | |
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779 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 780 } else { |
781 // not last one | |
782 assert(new_top > hr->end(), "new_top should be above this region"); | |
783 hr->set_top(hr->end()); | |
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784 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 785 } |
786 } | |
787 // If we have continues humongous regions (hr != NULL), then the | |
788 // end of the last one should match new_end and its top should | |
789 // match new_top. | |
790 assert(hr == NULL || | |
791 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
792 | |
793 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
794 _summary_bytes_used += first_hr->used(); | |
795 _humongous_set.add(first_hr); | |
796 | |
797 return new_obj; | |
798 } | |
799 | |
342 | 800 // If could fit into free regions w/o expansion, try. |
801 // Otherwise, if can expand, do so. | |
802 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 803 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 804 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
805 | |
806 verify_region_sets_optional(); | |
342 | 807 |
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808 size_t word_size_rounded = round_to(word_size, HeapRegion::GrainWords); |
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809 uint num_regions = (uint) (word_size_rounded / HeapRegion::GrainWords); |
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810 uint x_num = expansion_regions(); |
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811 uint fs = _hrs.free_suffix(); |
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812 uint first = humongous_obj_allocate_find_first(num_regions, word_size); |
3766 | 813 if (first == G1_NULL_HRS_INDEX) { |
2152 | 814 // The only thing we can do now is attempt expansion. |
6010
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815 if (fs + x_num >= num_regions) { |
2188
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816 // If the number of regions we're trying to allocate for this |
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817 // object is at most the number of regions in the free suffix, |
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818 // then the call to humongous_obj_allocate_find_first() above |
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819 // should have succeeded and we wouldn't be here. |
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820 // |
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821 // We should only be trying to expand when the free suffix is |
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822 // not sufficient for the object _and_ we have some expansion |
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823 // room available. |
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824 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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825 |
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826 ergo_verbose1(ErgoHeapSizing, |
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827 "attempt heap expansion", |
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828 ergo_format_reason("humongous allocation request failed") |
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829 ergo_format_byte("allocation request"), |
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830 word_size * HeapWordSize); |
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831 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 832 // Even though the heap was expanded, it might not have |
833 // reached the desired size. So, we cannot assume that the | |
834 // allocation will succeed. | |
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835 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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836 } |
2152 | 837 } |
838 } | |
839 | |
2361 | 840 HeapWord* result = NULL; |
3766 | 841 if (first != G1_NULL_HRS_INDEX) { |
2361 | 842 result = |
843 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
844 assert(result != NULL, "it should always return a valid result"); | |
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845 |
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846 // A successful humongous object allocation changes the used space |
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847 // information of the old generation so we need to recalculate the |
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848 // sizes and update the jstat counters here. |
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849 g1mm()->update_sizes(); |
2152 | 850 } |
851 | |
852 verify_region_sets_optional(); | |
2361 | 853 |
854 return result; | |
342 | 855 } |
856 | |
1973 | 857 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
858 assert_heap_not_locked_and_not_at_safepoint(); | |
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859 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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860 |
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861 unsigned int dummy_gc_count_before; |
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862 int dummy_gclocker_retry_count = 0; |
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863 return attempt_allocation(word_size, &dummy_gc_count_before, &dummy_gclocker_retry_count); |
342 | 864 } |
865 | |
866 HeapWord* | |
867 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 868 bool* gc_overhead_limit_was_exceeded) { |
869 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 870 |
10405 | 871 // Loop until the allocation is satisfied, or unsatisfied after GC. |
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872 for (int try_count = 1, gclocker_retry_count = 0; /* we'll return */; try_count += 1) { |
1973 | 873 unsigned int gc_count_before; |
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874 |
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875 HeapWord* result = NULL; |
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876 if (!isHumongous(word_size)) { |
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877 result = attempt_allocation(word_size, &gc_count_before, &gclocker_retry_count); |
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878 } else { |
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879 result = attempt_allocation_humongous(word_size, &gc_count_before, &gclocker_retry_count); |
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880 } |
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881 if (result != NULL) { |
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882 return result; |
342 | 883 } |
884 | |
885 // Create the garbage collection operation... | |
1973 | 886 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 887 // ...and get the VM thread to execute it. |
888 VMThread::execute(&op); | |
1973 | 889 |
890 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
891 // If the operation was successful we'll return the result even | |
892 // if it is NULL. If the allocation attempt failed immediately | |
893 // after a Full GC, it's unlikely we'll be able to allocate now. | |
894 HeapWord* result = op.result(); | |
895 if (result != NULL && !isHumongous(word_size)) { | |
896 // Allocations that take place on VM operations do not do any | |
897 // card dirtying and we have to do it here. We only have to do | |
898 // this for non-humongous allocations, though. | |
899 dirty_young_block(result, word_size); | |
900 } | |
342 | 901 return result; |
1973 | 902 } else { |
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903 if (gclocker_retry_count > GCLockerRetryAllocationCount) { |
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904 return NULL; |
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905 } |
1973 | 906 assert(op.result() == NULL, |
907 "the result should be NULL if the VM op did not succeed"); | |
342 | 908 } |
909 | |
910 // Give a warning if we seem to be looping forever. | |
911 if ((QueuedAllocationWarningCount > 0) && | |
912 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 913 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 914 } |
915 } | |
1973 | 916 |
917 ShouldNotReachHere(); | |
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918 return NULL; |
342 | 919 } |
920 | |
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921 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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922 unsigned int *gc_count_before_ret, |
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923 int* gclocker_retry_count_ret) { |
2433
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924 // Make sure you read the note in attempt_allocation_humongous(). |
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925 |
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926 assert_heap_not_locked_and_not_at_safepoint(); |
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927 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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928 "be called for humongous allocation requests"); |
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929 |
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930 // We should only get here after the first-level allocation attempt |
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931 // (attempt_allocation()) failed to allocate. |
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932 |
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933 // We will loop until a) we manage to successfully perform the |
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934 // allocation or b) we successfully schedule a collection which |
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935 // fails to perform the allocation. b) is the only case when we'll |
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936 // return NULL. |
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937 HeapWord* result = NULL; |
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938 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
939 bool should_try_gc; |
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|
940 unsigned int gc_count_before; |
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941 |
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942 { |
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|
943 MutexLockerEx x(Heap_lock); |
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944 |
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|
945 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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946 false /* bot_updates */); |
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|
947 if (result != NULL) { |
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|
948 return result; |
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|
949 } |
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|
950 |
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951 // If we reach here, attempt_allocation_locked() above failed to |
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952 // allocate a new region. So the mutator alloc region should be NULL. |
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953 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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|
954 |
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|
955 if (GC_locker::is_active_and_needs_gc()) { |
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956 if (g1_policy()->can_expand_young_list()) { |
3914
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957 // No need for an ergo verbose message here, |
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958 // can_expand_young_list() does this when it returns true. |
2433
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959 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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960 false /* bot_updates */); |
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|
961 if (result != NULL) { |
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|
962 return result; |
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|
963 } |
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964 } |
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965 should_try_gc = false; |
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966 } else { |
6106
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967 // The GCLocker may not be active but the GCLocker initiated |
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968 // GC may not yet have been performed (GCLocker::needs_gc() |
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969 // returns true). In this case we do not try this GC and |
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970 // wait until the GCLocker initiated GC is performed, and |
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971 // then retry the allocation. |
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972 if (GC_locker::needs_gc()) { |
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|
973 should_try_gc = false; |
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|
974 } else { |
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|
975 // Read the GC count while still holding the Heap_lock. |
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976 gc_count_before = total_collections(); |
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977 should_try_gc = true; |
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|
978 } |
2433
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979 } |
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980 } |
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|
981 |
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982 if (should_try_gc) { |
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983 bool succeeded; |
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984 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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985 if (result != NULL) { |
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986 assert(succeeded, "only way to get back a non-NULL result"); |
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987 return result; |
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988 } |
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989 |
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990 if (succeeded) { |
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991 // If we get here we successfully scheduled a collection which |
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992 // failed to allocate. No point in trying to allocate |
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993 // further. We'll just return NULL. |
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994 MutexLockerEx x(Heap_lock); |
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995 *gc_count_before_ret = total_collections(); |
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996 return NULL; |
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997 } |
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998 } else { |
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999 if (*gclocker_retry_count_ret > GCLockerRetryAllocationCount) { |
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1000 MutexLockerEx x(Heap_lock); |
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1001 *gc_count_before_ret = total_collections(); |
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1002 return NULL; |
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1003 } |
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1004 // The GCLocker is either active or the GCLocker initiated |
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1005 // GC has not yet been performed. Stall until it is and |
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1006 // then retry the allocation. |
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1007 GC_locker::stall_until_clear(); |
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1008 (*gclocker_retry_count_ret) += 1; |
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1009 } |
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1010 |
10405 | 1011 // We can reach here if we were unsuccessful in scheduling a |
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1012 // collection (because another thread beat us to it) or if we were |
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1013 // stalled due to the GC locker. In either can we should retry the |
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1014 // allocation attempt in case another thread successfully |
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1015 // performed a collection and reclaimed enough space. We do the |
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1016 // first attempt (without holding the Heap_lock) here and the |
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1017 // follow-on attempt will be at the start of the next loop |
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1018 // iteration (after taking the Heap_lock). |
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1019 result = _mutator_alloc_region.attempt_allocation(word_size, |
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1020 false /* bot_updates */); |
5963
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1021 if (result != NULL) { |
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1022 return result; |
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1023 } |
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1024 |
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1025 // Give a warning if we seem to be looping forever. |
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1026 if ((QueuedAllocationWarningCount > 0) && |
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1027 (try_count % QueuedAllocationWarningCount == 0)) { |
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1028 warning("G1CollectedHeap::attempt_allocation_slow() " |
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1029 "retries %d times", try_count); |
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1030 } |
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1031 } |
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1032 |
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1033 ShouldNotReachHere(); |
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1034 return NULL; |
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1035 } |
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1036 |
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1037 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1038 unsigned int * gc_count_before_ret, |
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1039 int* gclocker_retry_count_ret) { |
2433
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1040 // The structure of this method has a lot of similarities to |
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1041 // attempt_allocation_slow(). The reason these two were not merged |
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1042 // into a single one is that such a method would require several "if |
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1043 // allocation is not humongous do this, otherwise do that" |
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1044 // conditional paths which would obscure its flow. In fact, an early |
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1045 // version of this code did use a unified method which was harder to |
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1046 // follow and, as a result, it had subtle bugs that were hard to |
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1047 // track down. So keeping these two methods separate allows each to |
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1048 // be more readable. It will be good to keep these two in sync as |
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1049 // much as possible. |
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|
1050 |
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|
1051 assert_heap_not_locked_and_not_at_safepoint(); |
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1052 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1053 "should only be called for humongous allocations"); |
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|
1054 |
4834
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1055 // Humongous objects can exhaust the heap quickly, so we should check if we |
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|
1056 // need to start a marking cycle at each humongous object allocation. We do |
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|
1057 // the check before we do the actual allocation. The reason for doing it |
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|
1058 // before the allocation is that we avoid having to keep track of the newly |
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|
1059 // allocated memory while we do a GC. |
4910
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|
1060 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
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|
1061 word_size)) { |
4834
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|
1062 collect(GCCause::_g1_humongous_allocation); |
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|
1063 } |
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|
1064 |
2433
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1065 // We will loop until a) we manage to successfully perform the |
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1066 // allocation or b) we successfully schedule a collection which |
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|
1067 // fails to perform the allocation. b) is the only case when we'll |
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|
1068 // return NULL. |
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|
1069 HeapWord* result = NULL; |
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|
1070 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
1071 bool should_try_gc; |
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|
1072 unsigned int gc_count_before; |
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|
1073 |
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|
1074 { |
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|
1075 MutexLockerEx x(Heap_lock); |
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|
1076 |
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1077 // Given that humongous objects are not allocated in young |
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1078 // regions, we'll first try to do the allocation without doing a |
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1079 // collection hoping that there's enough space in the heap. |
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|
1080 result = humongous_obj_allocate(word_size); |
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|
1081 if (result != NULL) { |
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|
1082 return result; |
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|
1083 } |
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|
1084 |
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|
1085 if (GC_locker::is_active_and_needs_gc()) { |
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|
1086 should_try_gc = false; |
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|
1087 } else { |
6106
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1088 // The GCLocker may not be active but the GCLocker initiated |
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|
1089 // GC may not yet have been performed (GCLocker::needs_gc() |
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|
1090 // returns true). In this case we do not try this GC and |
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1091 // wait until the GCLocker initiated GC is performed, and |
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|
1092 // then retry the allocation. |
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|
1093 if (GC_locker::needs_gc()) { |
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|
1094 should_try_gc = false; |
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|
1095 } else { |
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|
1096 // Read the GC count while still holding the Heap_lock. |
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|
1097 gc_count_before = total_collections(); |
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|
1098 should_try_gc = true; |
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|
1099 } |
2433
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|
1100 } |
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|
1101 } |
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|
1102 |
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|
1103 if (should_try_gc) { |
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1104 // If we failed to allocate the humongous object, we should try to |
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1105 // do a collection pause (if we're allowed) in case it reclaims |
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1106 // enough space for the allocation to succeed after the pause. |
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1107 |
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1108 bool succeeded; |
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1109 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1110 if (result != NULL) { |
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1111 assert(succeeded, "only way to get back a non-NULL result"); |
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1112 return result; |
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1113 } |
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1114 |
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1115 if (succeeded) { |
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1116 // If we get here we successfully scheduled a collection which |
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1117 // failed to allocate. No point in trying to allocate |
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1118 // further. We'll just return NULL. |
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1119 MutexLockerEx x(Heap_lock); |
4910
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1120 *gc_count_before_ret = total_collections(); |
2433
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1121 return NULL; |
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1122 } |
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1123 } else { |
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1124 if (*gclocker_retry_count_ret > GCLockerRetryAllocationCount) { |
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1125 MutexLockerEx x(Heap_lock); |
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1126 *gc_count_before_ret = total_collections(); |
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1127 return NULL; |
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1128 } |
6106
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1129 // The GCLocker is either active or the GCLocker initiated |
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1130 // GC has not yet been performed. Stall until it is and |
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1131 // then retry the allocation. |
2433
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1132 GC_locker::stall_until_clear(); |
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1133 (*gclocker_retry_count_ret) += 1; |
2433
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1134 } |
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1135 |
10405 | 1136 // We can reach here if we were unsuccessful in scheduling a |
2433
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1137 // collection (because another thread beat us to it) or if we were |
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1138 // stalled due to the GC locker. In either can we should retry the |
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1139 // allocation attempt in case another thread successfully |
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1140 // performed a collection and reclaimed enough space. Give a |
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1141 // warning if we seem to be looping forever. |
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1142 |
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1143 if ((QueuedAllocationWarningCount > 0) && |
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1144 (try_count % QueuedAllocationWarningCount == 0)) { |
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1145 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1146 "retries %d times", try_count); |
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1147 } |
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1148 } |
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1149 |
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1150 ShouldNotReachHere(); |
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1151 return NULL; |
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1152 } |
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1153 |
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1154 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1155 bool expect_null_mutator_alloc_region) { |
2152 | 1156 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1157 assert(_mutator_alloc_region.get() == NULL || |
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1158 !expect_null_mutator_alloc_region, |
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1159 "the current alloc region was unexpectedly found to be non-NULL"); |
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1160 |
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1161 if (!isHumongous(word_size)) { |
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1162 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1163 false /* bot_updates */); |
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1164 } else { |
4829
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|
1165 HeapWord* result = humongous_obj_allocate(word_size); |
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1166 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
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1167 g1_policy()->set_initiate_conc_mark_if_possible(); |
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|
1168 } |
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|
1169 return result; |
2433
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|
1170 } |
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|
1171 |
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1172 ShouldNotReachHere(); |
342 | 1173 } |
1174 | |
1175 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
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1176 G1CollectedHeap* _g1h; |
342 | 1177 ModRefBarrierSet* _mr_bs; |
1178 public: | |
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1179 PostMCRemSetClearClosure(G1CollectedHeap* g1h, ModRefBarrierSet* mr_bs) : |
12080 | 1180 _g1h(g1h), _mr_bs(mr_bs) {} |
1181 | |
342 | 1182 bool doHeapRegion(HeapRegion* r) { |
12080 | 1183 HeapRegionRemSet* hrrs = r->rem_set(); |
1184 | |
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1185 if (r->continuesHumongous()) { |
12080 | 1186 // We'll assert that the strong code root list and RSet is empty |
1187 assert(hrrs->strong_code_roots_list_length() == 0, "sanity"); | |
1188 assert(hrrs->occupied() == 0, "RSet should be empty"); | |
342 | 1189 return false; |
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1190 } |
12080 | 1191 |
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1192 _g1h->reset_gc_time_stamps(r); |
12080 | 1193 hrrs->clear(); |
342 | 1194 // You might think here that we could clear just the cards |
1195 // corresponding to the used region. But no: if we leave a dirty card | |
1196 // in a region we might allocate into, then it would prevent that card | |
1197 // from being enqueued, and cause it to be missed. | |
1198 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1199 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
12080 | 1200 |
342 | 1201 return false; |
1202 } | |
1203 }; | |
1204 | |
6254
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1205 void G1CollectedHeap::clear_rsets_post_compaction() { |
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1206 PostMCRemSetClearClosure rs_clear(this, mr_bs()); |
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1207 heap_region_iterate(&rs_clear); |
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1208 } |
342 | 1209 |
626
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|
1210 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1211 G1CollectedHeap* _g1h; |
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|
1212 UpdateRSOopClosure _cl; |
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|
1213 int _worker_i; |
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|
1214 public: |
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|
1215 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1216 _cl(g1->g1_rem_set(), worker_i), |
626
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1217 _worker_i(worker_i), |
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1218 _g1h(g1) |
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|
1219 { } |
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|
1220 |
626
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1221 bool doHeapRegion(HeapRegion* r) { |
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1222 if (!r->continuesHumongous()) { |
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|
1223 _cl.set_from(r); |
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|
1224 r->oop_iterate(&_cl); |
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|
1225 } |
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|
1226 return false; |
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|
1227 } |
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|
1228 }; |
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|
1229 |
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1230 class ParRebuildRSTask: public AbstractGangTask { |
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|
1231 G1CollectedHeap* _g1; |
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|
1232 public: |
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|
1233 ParRebuildRSTask(G1CollectedHeap* g1) |
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1234 : AbstractGangTask("ParRebuildRSTask"), |
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1235 _g1(g1) |
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1236 { } |
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|
1237 |
4728
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|
1238 void work(uint worker_id) { |
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|
1239 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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|
1240 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
4095
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|
1241 _g1->workers()->active_workers(), |
626
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|
1242 HeapRegion::RebuildRSClaimValue); |
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|
1243 } |
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|
1244 }; |
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|
1245 |
3778
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|
1246 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1247 private: |
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1248 G1HRPrinter* _hr_printer; |
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1249 public: |
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1250 bool doHeapRegion(HeapRegion* hr) { |
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1251 assert(!hr->is_young(), "not expecting to find young regions"); |
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1252 // We only generate output for non-empty regions. |
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1253 if (!hr->is_empty()) { |
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1254 if (!hr->isHumongous()) { |
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1255 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1256 } else if (hr->startsHumongous()) { |
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1257 if (hr->region_num() == 1) { |
3778
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1258 // single humongous region |
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1259 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1260 } else { |
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1261 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1262 } |
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1263 } else { |
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1264 assert(hr->continuesHumongous(), "only way to get here"); |
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1265 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1266 } |
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1267 } |
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1268 return false; |
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|
1269 } |
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1270 |
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1271 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1272 : _hr_printer(hr_printer) { } |
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1273 }; |
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1274 |
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1275 void G1CollectedHeap::print_hrs_post_compaction() { |
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1276 PostCompactionPrinterClosure cl(hr_printer()); |
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1277 heap_region_iterate(&cl); |
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1278 } |
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1279 |
1973 | 1280 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1281 bool clear_all_soft_refs, |
342 | 1282 size_t word_size) { |
2152 | 1283 assert_at_safepoint(true /* should_be_vm_thread */); |
1284 | |
1359
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1285 if (GC_locker::check_active_before_gc()) { |
1973 | 1286 return false; |
1359
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1287 } |
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1288 |
10405 | 1289 STWGCTimer* gc_timer = G1MarkSweep::gc_timer(); |
1290 gc_timer->register_gc_start(os::elapsed_counter()); | |
1291 | |
1292 SerialOldTracer* gc_tracer = G1MarkSweep::gc_tracer(); | |
1293 gc_tracer->report_gc_start(gc_cause(), gc_timer->gc_start()); | |
1294 | |
2125
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|
1295 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1296 ResourceMark rm; |
1297 | |
4872
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1298 print_heap_before_gc(); |
10405 | 1299 trace_heap_before_gc(gc_tracer); |
838
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1300 |
10183
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1301 size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
6725
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1302 |
4072 | 1303 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1304 verify_region_sets_optional(); |
342 | 1305 |
1387
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1306 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1307 collector_policy()->should_clear_all_soft_refs(); |
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1308 |
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|
1309 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1310 |
342 | 1311 { |
1312 IsGCActiveMark x; | |
1313 | |
1314 // Timing | |
6030 | 1315 assert(gc_cause() != GCCause::_java_lang_system_gc || explicit_gc, "invariant"); |
6007
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1316 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
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1317 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
6030 | 1318 |
342 | 1319 { |
10405 | 1320 GCTraceTime t(GCCauseString("Full GC", gc_cause()), G1Log::fine(), true, NULL); |
10098
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1321 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
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1322 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1323 |
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1324 double start = os::elapsedTime(); |
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1325 g1_policy()->record_full_collection_start(); |
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1326 |
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1327 // Note: When we have a more flexible GC logging framework that |
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1328 // allows us to add optional attributes to a GC log record we |
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1329 // could consider timing and reporting how long we wait in the |
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1330 // following two methods. |
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1331 wait_while_free_regions_coming(); |
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1332 // If we start the compaction before the CM threads finish |
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1333 // scanning the root regions we might trip them over as we'll |
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1334 // be moving objects / updating references. So let's wait until |
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1335 // they are done. By telling them to abort, they should complete |
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1336 // early. |
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1337 _cm->root_regions()->abort(); |
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1338 _cm->root_regions()->wait_until_scan_finished(); |
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1339 append_secondary_free_list_if_not_empty_with_lock(); |
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1340 |
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1341 gc_prologue(true); |
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1342 increment_total_collections(true /* full gc */); |
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1343 increment_old_marking_cycles_started(); |
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|
1344 |
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|
1345 assert(used() == recalculate_used(), "Should be equal"); |
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1346 |
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1347 verify_before_gc(); |
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1348 |
10405 | 1349 pre_full_gc_dump(gc_timer); |
10098
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1350 |
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1351 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
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|
1352 |
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1353 // Disable discovery and empty the discovered lists |
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|
1354 // for the CM ref processor. |
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|
1355 ref_processor_cm()->disable_discovery(); |
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|
1356 ref_processor_cm()->abandon_partial_discovery(); |
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|
1357 ref_processor_cm()->verify_no_references_recorded(); |
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1358 |
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1359 // Abandon current iterations of concurrent marking and concurrent |
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1360 // refinement, if any are in progress. We have to do this before |
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|
1361 // wait_until_scan_finished() below. |
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|
1362 concurrent_mark()->abort(); |
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|
1363 |
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1364 // Make sure we'll choose a new allocation region afterwards. |
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1365 release_mutator_alloc_region(); |
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|
1366 abandon_gc_alloc_regions(); |
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1367 g1_rem_set()->cleanupHRRS(); |
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|
1368 |
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1369 // We should call this after we retire any currently active alloc |
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1370 // regions so that all the ALLOC / RETIRE events are generated |
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|
1371 // before the start GC event. |
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|
1372 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1373 |
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1374 // We may have added regions to the current incremental collection |
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1375 // set between the last GC or pause and now. We need to clear the |
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1376 // incremental collection set and then start rebuilding it afresh |
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|
1377 // after this full GC. |
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|
1378 abandon_collection_set(g1_policy()->inc_cset_head()); |
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|
1379 g1_policy()->clear_incremental_cset(); |
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1380 g1_policy()->stop_incremental_cset_building(); |
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1381 |
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|
1382 tear_down_region_sets(false /* free_list_only */); |
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|
1383 g1_policy()->set_gcs_are_young(true); |
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1384 |
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1385 // See the comments in g1CollectedHeap.hpp and |
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1386 // G1CollectedHeap::ref_processing_init() about |
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1387 // how reference processing currently works in G1. |
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|
1388 |
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|
1389 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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|
1390 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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|
1391 |
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1392 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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|
1393 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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1394 |
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1395 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1396 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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|
1397 |
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|
1398 // Do collection work |
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|
1399 { |
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|
1400 HandleMark hm; // Discard invalid handles created during gc |
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1401 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
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|
1402 } |
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|
1403 |
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|
1404 assert(free_regions() == 0, "we should not have added any free regions"); |
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|
1405 rebuild_region_sets(false /* free_list_only */); |
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|
1406 |
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1407 // Enqueue any discovered reference objects that have |
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1408 // not been removed from the discovered lists. |
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1409 ref_processor_stw()->enqueue_discovered_references(); |
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|
1410 |
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|
1411 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
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|
1412 |
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|
1413 MemoryService::track_memory_usage(); |
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|
1414 |
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1415 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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1416 ref_processor_stw()->verify_no_references_recorded(); |
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|
1417 |
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1418 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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|
1419 ClassLoaderDataGraph::purge(); |
12080 | 1420 MetaspaceAux::verify_metrics(); |
10098
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1421 |
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1422 // Note: since we've just done a full GC, concurrent |
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1423 // marking is no longer active. Therefore we need not |
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|
1424 // re-enable reference discovery for the CM ref processor. |
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|
1425 // That will be done at the start of the next marking cycle. |
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|
1426 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1427 ref_processor_cm()->verify_no_references_recorded(); |
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|
1428 |
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|
1429 reset_gc_time_stamp(); |
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|
1430 // Since everything potentially moved, we will clear all remembered |
10405 | 1431 // sets, and clear all cards. Later we will rebuild remembered |
10098
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|
1432 // sets. We will also reset the GC time stamps of the regions. |
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|
1433 clear_rsets_post_compaction(); |
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|
1434 check_gc_time_stamps(); |
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|
1435 |
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|
1436 // Resize the heap if necessary. |
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|
1437 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
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|
1438 |
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|
1439 if (_hr_printer.is_active()) { |
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|
1440 // We should do this after we potentially resize the heap so |
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|
1441 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1442 // the end GC event. |
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|
1443 |
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|
1444 print_hrs_post_compaction(); |
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|
1445 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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|
1446 } |
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|
1447 |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
1448 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
194f52aa2f23
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|
1449 if (hot_card_cache->use_cache()) { |
194f52aa2f23
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|
1450 hot_card_cache->reset_card_counts(); |
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|
1451 hot_card_cache->reset_hot_cache(); |
10098
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|
1452 } |
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|
1453 |
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|
1454 // Rebuild remembered sets of all regions. |
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|
1455 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1456 uint n_workers = |
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|
1457 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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|
1458 workers()->active_workers(), |
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|
1459 Threads::number_of_non_daemon_threads()); |
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|
1460 assert(UseDynamicNumberOfGCThreads || |
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|
1461 n_workers == workers()->total_workers(), |
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|
1462 "If not dynamic should be using all the workers"); |
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|
1463 workers()->set_active_workers(n_workers); |
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|
1464 // Set parallel threads in the heap (_n_par_threads) only |
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|
1465 // before a parallel phase and always reset it to 0 after |
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|
1466 // the phase so that the number of parallel threads does |
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|
1467 // no get carried forward to a serial phase where there |
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|
1468 // may be code that is "possibly_parallel". |
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|
1469 set_par_threads(n_workers); |
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|
1470 |
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|
1471 ParRebuildRSTask rebuild_rs_task(this); |
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|
1472 assert(check_heap_region_claim_values( |
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|
1473 HeapRegion::InitialClaimValue), "sanity check"); |
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|
1474 assert(UseDynamicNumberOfGCThreads || |
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|
1475 workers()->active_workers() == workers()->total_workers(), |
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|
1476 "Unless dynamic should use total workers"); |
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|
1477 // Use the most recent number of active workers |
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|
1478 assert(workers()->active_workers() > 0, |
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|
1479 "Active workers not properly set"); |
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|
1480 set_par_threads(workers()->active_workers()); |
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|
1481 workers()->run_task(&rebuild_rs_task); |
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|
1482 set_par_threads(0); |
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|
1483 assert(check_heap_region_claim_values( |
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|
1484 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1485 reset_heap_region_claim_values(); |
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|
1486 } else { |
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|
1487 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1488 heap_region_iterate(&rebuild_rs); |
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|
1489 } |
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|
1490 |
12080 | 1491 // Rebuild the strong code root lists for each region |
1492 rebuild_strong_code_roots(); | |
1493 | |
10098
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|
1494 if (true) { // FIXME |
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|
1495 MetaspaceGC::compute_new_size(); |
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|
1496 } |
342 | 1497 |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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diff
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|
1498 #ifdef TRACESPINNING |
10098
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|
1499 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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|
1500 #endif |
05c6d52fa7a9
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jmasa
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545
diff
changeset
|
1501 |
10098
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|
1502 // Discard all rset updates |
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|
1503 JavaThread::dirty_card_queue_set().abandon_logs(); |
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|
1504 assert(!G1DeferredRSUpdate |
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|
1505 || (G1DeferredRSUpdate && |
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|
1506 (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
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|
1507 |
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|
1508 _young_list->reset_sampled_info(); |
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|
1509 // At this point there should be no regions in the |
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|
1510 // entire heap tagged as young. |
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|
1511 assert(check_young_list_empty(true /* check_heap */), |
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|
1512 "young list should be empty at this point"); |
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|
1513 |
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|
1514 // Update the number of full collections that have been completed. |
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|
1515 increment_old_marking_cycles_completed(false /* concurrent */); |
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|
1516 |
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|
1517 _hrs.verify_optional(); |
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|
1518 verify_region_sets_optional(); |
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|
1519 |
10373
3a4805ad0005
8015244: G1: Verification after a full GC is incorrectly placed.
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|
1520 verify_after_gc(); |
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|
1521 |
10098
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1522 // Start a new incremental collection set for the next pause |
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1523 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1524 g1_policy()->start_incremental_cset_building(); |
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1525 |
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1526 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1527 // regions to the incremental collection set for the next |
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1528 // evacuation pause. |
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1529 clear_cset_fast_test(); |
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1530 |
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1531 init_mutator_alloc_region(); |
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1532 |
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1533 double end = os::elapsedTime(); |
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1534 g1_policy()->record_full_collection_end(); |
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1535 |
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1536 if (G1Log::fine()) { |
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1537 g1_policy()->print_heap_transition(); |
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1538 } |
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1539 |
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1540 // We must call G1MonitoringSupport::update_sizes() in the same scoping level |
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1541 // as an active TraceMemoryManagerStats object (i.e. before the destructor for the |
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1542 // TraceMemoryManagerStats is called) so that the G1 memory pools are updated |
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1543 // before any GC notifications are raised. |
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1544 g1mm()->update_sizes(); |
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1545 |
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1546 gc_epilogue(true); |
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1547 } |
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1548 |
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1549 if (G1Log::finer()) { |
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1550 g1_policy()->print_detailed_heap_transition(true /* full */); |
10098
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1551 } |
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1552 |
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1553 print_heap_after_gc(); |
10405 | 1554 trace_heap_after_gc(gc_tracer); |
1555 | |
1556 post_full_gc_dump(gc_timer); | |
1557 | |
1558 gc_timer->register_gc_end(os::elapsed_counter()); | |
1559 gc_tracer->report_gc_end(gc_timer->gc_end(), gc_timer->time_partitions()); | |
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1560 } |
1973 | 1561 |
1562 return true; | |
342 | 1563 } |
1564 | |
1565 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1566 // do_collection() will return whether it succeeded in performing |
1567 // the GC. Currently, there is no facility on the | |
1568 // do_full_collection() API to notify the caller than the collection | |
1569 // did not succeed (e.g., because it was locked out by the GC | |
1570 // locker). So, right now, we'll ignore the return value. | |
1571 bool dummy = do_collection(true, /* explicit_gc */ | |
1572 clear_all_soft_refs, | |
1573 0 /* word_size */); | |
342 | 1574 } |
1575 | |
1576 // This code is mostly copied from TenuredGeneration. | |
1577 void | |
1578 G1CollectedHeap:: | |
1579 resize_if_necessary_after_full_collection(size_t word_size) { | |
1580 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1581 | |
1582 // Include the current allocation, if any, and bytes that will be | |
1583 // pre-allocated to support collections, as "used". | |
1584 const size_t used_after_gc = used(); | |
1585 const size_t capacity_after_gc = capacity(); | |
1586 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1587 | |
1717
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1588 // This is enforced in arguments.cpp. |
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1589 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1590 "otherwise the code below doesn't make sense"); |
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1591 |
342 | 1592 // We don't have floating point command-line arguments |
1717
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1593 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1594 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1595 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1596 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1597 | |
1717
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1598 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1599 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1600 |
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1601 // We have to be careful here as these two calculations can overflow |
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1602 // 32-bit size_t's. |
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1603 double used_after_gc_d = (double) used_after_gc; |
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1604 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1605 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1606 |
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1607 // Let's make sure that they are both under the max heap size, which |
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1608 // by default will make them fit into a size_t. |
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1609 double desired_capacity_upper_bound = (double) max_heap_size; |
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1610 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1611 desired_capacity_upper_bound); |
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1612 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1613 desired_capacity_upper_bound); |
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1614 |
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1615 // We can now safely turn them into size_t's. |
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1616 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1617 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1618 |
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1619 // This assert only makes sense here, before we adjust them |
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1620 // with respect to the min and max heap size. |
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1621 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1622 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1623 "maximum_desired_capacity = "SIZE_FORMAT, |
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1624 minimum_desired_capacity, maximum_desired_capacity)); |
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1625 |
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1626 // Should not be greater than the heap max size. No need to adjust |
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1627 // it with respect to the heap min size as it's a lower bound (i.e., |
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1628 // we'll try to make the capacity larger than it, not smaller). |
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1629 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1630 // Should not be less than the heap min size. No need to adjust it |
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1631 // with respect to the heap max size as it's an upper bound (i.e., |
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1632 // we'll try to make the capacity smaller than it, not greater). |
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1633 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1634 |
1717
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1635 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1636 // Don't expand unless it's significant |
1637 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1638 ergo_verbose4(ErgoHeapSizing, |
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1639 "attempt heap expansion", |
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1640 ergo_format_reason("capacity lower than " |
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1641 "min desired capacity after Full GC") |
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1642 ergo_format_byte("capacity") |
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1643 ergo_format_byte("occupancy") |
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1644 ergo_format_byte_perc("min desired capacity"), |
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1645 capacity_after_gc, used_after_gc, |
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1646 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1647 expand(expand_bytes); |
342 | 1648 |
1649 // No expansion, now see if we want to shrink | |
1717
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1650 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1651 // Capacity too large, compute shrinking size |
1652 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
3914
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1653 ergo_verbose4(ErgoHeapSizing, |
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1654 "attempt heap shrinking", |
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1655 ergo_format_reason("capacity higher than " |
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1656 "max desired capacity after Full GC") |
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1657 ergo_format_byte("capacity") |
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1658 ergo_format_byte("occupancy") |
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1659 ergo_format_byte_perc("max desired capacity"), |
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1660 capacity_after_gc, used_after_gc, |
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1661 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1662 shrink(shrink_bytes); |
1663 } | |
1664 } | |
1665 | |
1666 | |
1667 HeapWord* | |
1973 | 1668 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1669 bool* succeeded) { | |
2152 | 1670 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1671 |
1672 *succeeded = true; | |
1673 // Let's attempt the allocation first. | |
2433
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1674 HeapWord* result = |
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1675 attempt_allocation_at_safepoint(word_size, |
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1676 false /* expect_null_mutator_alloc_region */); |
1973 | 1677 if (result != NULL) { |
1678 assert(*succeeded, "sanity"); | |
1679 return result; | |
1680 } | |
342 | 1681 |
1682 // In a G1 heap, we're supposed to keep allocation from failing by | |
1683 // incremental pauses. Therefore, at least for now, we'll favor | |
1684 // expansion over collection. (This might change in the future if we can | |
1685 // do something smarter than full collection to satisfy a failed alloc.) | |
1686 result = expand_and_allocate(word_size); | |
1687 if (result != NULL) { | |
1973 | 1688 assert(*succeeded, "sanity"); |
342 | 1689 return result; |
1690 } | |
1691 | |
1973 | 1692 // Expansion didn't work, we'll try to do a Full GC. |
1693 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1694 false, /* clear_all_soft_refs */ | |
1695 word_size); | |
1696 if (!gc_succeeded) { | |
1697 *succeeded = false; | |
1698 return NULL; | |
1699 } | |
1700 | |
1701 // Retry the allocation | |
1702 result = attempt_allocation_at_safepoint(word_size, | |
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1703 true /* expect_null_mutator_alloc_region */); |
342 | 1704 if (result != NULL) { |
1973 | 1705 assert(*succeeded, "sanity"); |
342 | 1706 return result; |
1707 } | |
1708 | |
1973 | 1709 // Then, try a Full GC that will collect all soft references. |
1710 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1711 true, /* clear_all_soft_refs */ | |
1712 word_size); | |
1713 if (!gc_succeeded) { | |
1714 *succeeded = false; | |
1715 return NULL; | |
1716 } | |
1717 | |
1718 // Retry the allocation once more | |
1719 result = attempt_allocation_at_safepoint(word_size, | |
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1720 true /* expect_null_mutator_alloc_region */); |
342 | 1721 if (result != NULL) { |
1973 | 1722 assert(*succeeded, "sanity"); |
342 | 1723 return result; |
1724 } | |
1725 | |
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1726 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1727 "Flag should have been handled and cleared prior to this point"); |
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1728 |
342 | 1729 // What else? We might try synchronous finalization later. If the total |
1730 // space available is large enough for the allocation, then a more | |
1731 // complete compaction phase than we've tried so far might be | |
1732 // appropriate. | |
1973 | 1733 assert(*succeeded, "sanity"); |
342 | 1734 return NULL; |
1735 } | |
1736 | |
1737 // Attempting to expand the heap sufficiently | |
1738 // to support an allocation of the given "word_size". If | |
1739 // successful, perform the allocation and return the address of the | |
1740 // allocated block, or else "NULL". | |
1741 | |
1742 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1743 assert_at_safepoint(true /* should_be_vm_thread */); |
1744 | |
1745 verify_region_sets_optional(); | |
1973 | 1746 |
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1747 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1748 ergo_verbose1(ErgoHeapSizing, |
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1749 "attempt heap expansion", |
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1750 ergo_format_reason("allocation request failed") |
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1751 ergo_format_byte("allocation request"), |
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1752 word_size * HeapWordSize); |
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1753 if (expand(expand_bytes)) { |
3766 | 1754 _hrs.verify_optional(); |
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1755 verify_region_sets_optional(); |
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1756 return attempt_allocation_at_safepoint(word_size, |
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1757 false /* expect_null_mutator_alloc_region */); |
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1758 } |
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1759 return NULL; |
342 | 1760 } |
1761 | |
3766 | 1762 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1763 HeapWord* new_end) { | |
1764 assert(old_end != new_end, "don't call this otherwise"); | |
1765 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1766 | |
1767 // Update the committed mem region. | |
1768 _g1_committed.set_end(new_end); | |
1769 // Tell the card table about the update. | |
1770 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1771 // Tell the BOT about the update. | |
1772 _bot_shared->resize(_g1_committed.word_size()); | |
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1773 // Tell the hot card cache about the update |
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1774 _cg1r->hot_card_cache()->resize_card_counts(capacity()); |
3766 | 1775 } |
1776 | |
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1777 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1778 size_t old_mem_size = _g1_storage.committed_size(); |
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1779 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1780 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1781 HeapRegion::GrainBytes); | |
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1782 ergo_verbose2(ErgoHeapSizing, |
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1783 "expand the heap", |
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1784 ergo_format_byte("requested expansion amount") |
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1785 ergo_format_byte("attempted expansion amount"), |
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1786 expand_bytes, aligned_expand_bytes); |
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1787 |
3766 | 1788 // First commit the memory. |
1789 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1790 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1791 if (successful) { |
3766 | 1792 // Then propagate this update to the necessary data structures. |
1793 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1794 update_committed_space(old_end, new_end); | |
1795 | |
1796 FreeRegionList expansion_list("Local Expansion List"); | |
1797 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1798 assert(mr.start() == old_end, "post-condition"); | |
1799 // mr might be a smaller region than what was requested if | |
1800 // expand_by() was unable to allocate the HeapRegion instances | |
1801 assert(mr.end() <= new_end, "post-condition"); | |
1802 | |
1803 size_t actual_expand_bytes = mr.byte_size(); | |
1804 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1805 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1806 "post-condition"); | |
1807 if (actual_expand_bytes < aligned_expand_bytes) { | |
1808 // We could not expand _hrs to the desired size. In this case we | |
1809 // need to shrink the committed space accordingly. | |
1810 assert(mr.end() < new_end, "invariant"); | |
1811 | |
1812 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1813 // First uncommit the memory. | |
1814 _g1_storage.shrink_by(diff_bytes); | |
1815 // Then propagate this update to the necessary data structures. | |
1816 update_committed_space(new_end, mr.end()); | |
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1817 } |
3766 | 1818 _free_list.add_as_tail(&expansion_list); |
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1819 |
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1820 if (_hr_printer.is_active()) { |
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1821 HeapWord* curr = mr.start(); |
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1822 while (curr < mr.end()) { |
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1823 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1824 _hr_printer.commit(curr, curr_end); |
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1825 curr = curr_end; |
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1826 } |
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1827 assert(curr == mr.end(), "post-condition"); |
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1828 } |
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1829 g1_policy()->record_new_heap_size(n_regions()); |
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1830 } else { |
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1831 ergo_verbose0(ErgoHeapSizing, |
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1832 "did not expand the heap", |
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1833 ergo_format_reason("heap expansion operation failed")); |
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1834 // The expansion of the virtual storage space was unsuccessful. |
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1835 // Let's see if it was because we ran out of swap. |
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1836 if (G1ExitOnExpansionFailure && |
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1837 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1838 // We had head room... |
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1839 vm_exit_out_of_memory(aligned_expand_bytes, OOM_MMAP_ERROR, "G1 heap expansion"); |
342 | 1840 } |
1841 } | |
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1842 return successful; |
342 | 1843 } |
1844 | |
3766 | 1845 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1846 size_t old_mem_size = _g1_storage.committed_size(); |
1847 size_t aligned_shrink_bytes = | |
1848 ReservedSpace::page_align_size_down(shrink_bytes); | |
1849 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1850 HeapRegion::GrainBytes); | |
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1851 uint num_regions_to_remove = (uint)(shrink_bytes / HeapRegion::GrainBytes); |
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1852 |
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1853 uint num_regions_removed = _hrs.shrink_by(num_regions_to_remove); |
3766 | 1854 HeapWord* old_end = (HeapWord*) _g1_storage.high(); |
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1855 size_t shrunk_bytes = num_regions_removed * HeapRegion::GrainBytes; |
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1856 |
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1857 ergo_verbose3(ErgoHeapSizing, |
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1858 "shrink the heap", |
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1859 ergo_format_byte("requested shrinking amount") |
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1860 ergo_format_byte("aligned shrinking amount") |
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1861 ergo_format_byte("attempted shrinking amount"), |
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1862 shrink_bytes, aligned_shrink_bytes, shrunk_bytes); |
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1863 if (num_regions_removed > 0) { |
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1864 _g1_storage.shrink_by(shrunk_bytes); |
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1865 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
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1866 |
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1867 if (_hr_printer.is_active()) { |
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1868 HeapWord* curr = old_end; |
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1869 while (curr > new_end) { |
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1870 HeapWord* curr_end = curr; |
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1871 curr -= HeapRegion::GrainWords; |
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1872 _hr_printer.uncommit(curr, curr_end); |
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1873 } |
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1874 } |
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1875 |
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1876 _expansion_regions += num_regions_removed; |
3766 | 1877 update_committed_space(old_end, new_end); |
1878 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1879 g1_policy()->record_new_heap_size(n_regions()); |
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1880 } else { |
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1881 ergo_verbose0(ErgoHeapSizing, |
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1882 "did not shrink the heap", |
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1883 ergo_format_reason("heap shrinking operation failed")); |
342 | 1884 } |
1885 } | |
1886 | |
1887 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1888 verify_region_sets_optional(); |
1889 | |
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1890 // We should only reach here at the end of a Full GC which means we |
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1891 // should not not be holding to any GC alloc regions. The method |
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1892 // below will make sure of that and do any remaining clean up. |
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1893 abandon_gc_alloc_regions(); |
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1894 |
2152 | 1895 // Instead of tearing down / rebuilding the free lists here, we |
1896 // could instead use the remove_all_pending() method on free_list to | |
1897 // remove only the ones that we need to remove. | |
4072 | 1898 tear_down_region_sets(true /* free_list_only */); |
342 | 1899 shrink_helper(shrink_bytes); |
4072 | 1900 rebuild_region_sets(true /* free_list_only */); |
2152 | 1901 |
3766 | 1902 _hrs.verify_optional(); |
2152 | 1903 verify_region_sets_optional(); |
342 | 1904 } |
1905 | |
1906 // Public methods. | |
1907 | |
1908 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1909 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1910 #endif // _MSC_VER | |
1911 | |
1912 | |
1913 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1914 SharedHeap(policy_), | |
1915 _g1_policy(policy_), | |
1111 | 1916 _dirty_card_queue_set(false), |
1705 | 1917 _into_cset_dirty_card_queue_set(false), |
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1918 _is_alive_closure_cm(this), |
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1919 _is_alive_closure_stw(this), |
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1920 _ref_processor_cm(NULL), |
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1921 _ref_processor_stw(NULL), |
342 | 1922 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1923 _bot_shared(NULL), | |
10405 | 1924 _evac_failure_scan_stack(NULL), |
342 | 1925 _mark_in_progress(false), |
2152 | 1926 _cg1r(NULL), _summary_bytes_used(0), |
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1927 _g1mm(NULL), |
342 | 1928 _refine_cte_cl(NULL), |
1929 _full_collection(false), | |
2152 | 1930 _free_list("Master Free List"), |
1931 _secondary_free_list("Secondary Free List"), | |
4072 | 1932 _old_set("Old Set"), |
2152 | 1933 _humongous_set("Master Humongous Set"), |
1934 _free_regions_coming(false), | |
342 | 1935 _young_list(new YoungList(this)), |
1936 _gc_time_stamp(0), | |
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1937 _retained_old_gc_alloc_region(NULL), |
6595 | 1938 _survivor_plab_stats(YoungPLABSize, PLABWeight), |
1939 _old_plab_stats(OldPLABSize, PLABWeight), | |
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1940 _expand_heap_after_alloc_failure(true), |
526 | 1941 _surviving_young_words(NULL), |
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1942 _old_marking_cycles_started(0), |
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1943 _old_marking_cycles_completed(0), |
10405 | 1944 _concurrent_cycle_started(false), |
526 | 1945 _in_cset_fast_test(NULL), |
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1946 _in_cset_fast_test_base(NULL), |
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1947 _dirty_cards_region_list(NULL), |
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1948 _worker_cset_start_region(NULL), |
10405 | 1949 _worker_cset_start_region_time_stamp(NULL), |
1950 _gc_timer_stw(new (ResourceObj::C_HEAP, mtGC) STWGCTimer()), | |
1951 _gc_timer_cm(new (ResourceObj::C_HEAP, mtGC) ConcurrentGCTimer()), | |
1952 _gc_tracer_stw(new (ResourceObj::C_HEAP, mtGC) G1NewTracer()), | |
1953 _gc_tracer_cm(new (ResourceObj::C_HEAP, mtGC) G1OldTracer()) { | |
1954 | |
1955 _g1h = this; | |
342 | 1956 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { |
1957 vm_exit_during_initialization("Failed necessary allocation."); | |
1958 } | |
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1959 |
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1960 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1961 |
342 | 1962 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1963 _task_queues = new RefToScanQueueSet(n_queues); | |
1964 | |
1965 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1966 assert(n_rem_sets > 0, "Invariant."); | |
1967 | |
6197 | 1968 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues, mtGC); |
1969 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues, mtGC); | |
10405 | 1970 _evacuation_failed_info_array = NEW_C_HEAP_ARRAY(EvacuationFailedInfo, n_queues, mtGC); |
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1971 |
342 | 1972 for (int i = 0; i < n_queues; i++) { |
1973 RefToScanQueue* q = new RefToScanQueue(); | |
1974 q->initialize(); | |
1975 _task_queues->register_queue(i, q); | |
10405 | 1976 ::new (&_evacuation_failed_info_array[i]) EvacuationFailedInfo(); |
1977 } | |
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1978 clear_cset_start_regions(); |
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1979 |
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1980 // Initialize the G1EvacuationFailureALot counters and flags. |
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1981 NOT_PRODUCT(reset_evacuation_should_fail();) |
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1982 |
342 | 1983 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1984 } | |
1985 | |
1986 jint G1CollectedHeap::initialize() { | |
1166 | 1987 CollectedHeap::pre_initialize(); |
342 | 1988 os::enable_vtime(); |
1989 | |
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1990 G1Log::init(); |
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1991 |
342 | 1992 // Necessary to satisfy locking discipline assertions. |
1993 | |
1994 MutexLocker x(Heap_lock); | |
1995 | |
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1996 // We have to initialize the printer before committing the heap, as |
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1997 // it will be used then. |
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1998 _hr_printer.set_active(G1PrintHeapRegions); |
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1999 |
342 | 2000 // While there are no constraints in the GC code that HeapWordSize |
2001 // be any particular value, there are multiple other areas in the | |
2002 // system which believe this to be true (e.g. oop->object_size in some | |
2003 // cases incorrectly returns the size in wordSize units rather than | |
2004 // HeapWordSize). | |
2005 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
2006 | |
2007 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
2008 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
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2009 size_t heap_alignment = collector_policy()->max_alignment(); |
342 | 2010 |
2011 // Ensure that the sizes are properly aligned. | |
2012 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
2013 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
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2014 Universe::check_alignment(max_byte_size, heap_alignment, "g1 heap"); |
342 | 2015 |
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2016 _cg1r = new ConcurrentG1Refine(this); |
342 | 2017 |
2018 // Reserve the maximum. | |
642
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2019 |
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2020 // When compressed oops are enabled, the preferred heap base |
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2021 // is calculated by subtracting the requested size from the |
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2022 // 32Gb boundary and using the result as the base address for |
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2023 // heap reservation. If the requested size is not aligned to |
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2024 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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2025 // into the ReservedHeapSpace constructor) then the actual |
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2026 // base of the reserved heap may end up differing from the |
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2027 // address that was requested (i.e. the preferred heap base). |
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2028 // If this happens then we could end up using a non-optimal |
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2029 // compressed oops mode. |
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2030 |
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2031 ReservedSpace heap_rs = Universe::reserve_heap(max_byte_size, |
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2032 heap_alignment); |
342 | 2033 |
2034 // It is important to do this in a way such that concurrent readers can't | |
10405 | 2035 // temporarily think something is in the heap. (I've actually seen this |
342 | 2036 // happen in asserts: DLD.) |
2037 _reserved.set_word_size(0); | |
2038 _reserved.set_start((HeapWord*)heap_rs.base()); | |
2039 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
2040 | |
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2041 _expansion_regions = (uint) (max_byte_size / HeapRegion::GrainBytes); |
342 | 2042 |
2043 // Create the gen rem set (and barrier set) for the entire reserved region. | |
2044 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
2045 set_barrier_set(rem_set()->bs()); | |
2046 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
2047 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
2048 } else { | |
2049 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
2050 return JNI_ENOMEM; | |
2051 } | |
2052 | |
2053 // Also create a G1 rem set. | |
1861 | 2054 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
2055 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 2056 } else { |
1861 | 2057 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
2058 return JNI_ENOMEM; | |
342 | 2059 } |
2060 | |
2061 // Carve out the G1 part of the heap. | |
2062 | |
2063 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2064 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2065 g1_rs.size()/HeapWordSize); | |
2066 | |
2067 _g1_storage.initialize(g1_rs, 0); | |
2068 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2069 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
2070 (HeapWord*) _g1_reserved.end(), | |
2071 _expansion_regions); | |
342 | 2072 |
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2073 // Do later initialization work for concurrent refinement. |
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2074 _cg1r->init(); |
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2075 |
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2076 // 6843694 - ensure that the maximum region index can fit |
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2077 // in the remembered set structures. |
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2078 const uint max_region_idx = (1U << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
807
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2079 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2080 |
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2081 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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2082 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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2083 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2084 "too many cards per region"); |
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2085 |
2152 | 2086 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2087 | |
342 | 2088 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2089 heap_word_size(init_byte_size)); | |
2090 | |
2091 _g1h = this; | |
2092 | |
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2093 _in_cset_fast_test_length = max_regions(); |
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2094 _in_cset_fast_test_base = |
6197 | 2095 NEW_C_HEAP_ARRAY(bool, (size_t) _in_cset_fast_test_length, mtGC); |
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2096 |
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2097 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2098 // beginning of the heap every time we want to index; basically |
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2099 // it's the same with what we do with the card table. |
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2100 _in_cset_fast_test = _in_cset_fast_test_base - |
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2101 ((uintx) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2102 |
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2103 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2104 // regions to the incremental collection set for the first |
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2105 // evacuation pause. |
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2106 clear_cset_fast_test(); |
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2107 |
342 | 2108 // Create the ConcurrentMark data structure and thread. |
2109 // (Must do this late, so that "max_regions" is defined.) | |
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2110 _cm = new ConcurrentMark(this, heap_rs); |
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2111 if (_cm == NULL || !_cm->completed_initialization()) { |
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2112 vm_shutdown_during_initialization("Could not create/initialize ConcurrentMark"); |
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2113 return JNI_ENOMEM; |
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2114 } |
342 | 2115 _cmThread = _cm->cmThread(); |
2116 | |
2117 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2118 HeapRegionRemSet::init_heap(max_regions()); | |
2119 | |
677 | 2120 // Now expand into the initial heap size. |
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2121 if (!expand(init_byte_size)) { |
7397
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8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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parents:
7207
diff
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|
2122 vm_shutdown_during_initialization("Failed to allocate initial heap."); |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
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|
2123 return JNI_ENOMEM; |
c33825b68624
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diff
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|
2124 } |
342 | 2125 |
2126 // Perform any initialization actions delegated to the policy. | |
2127 g1_policy()->init(); | |
2128 | |
2129 _refine_cte_cl = | |
2130 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2131 g1_rem_set(), | |
2132 concurrent_g1_refine()); | |
2133 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2134 | |
2135 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2136 SATB_Q_FL_lock, | |
1111 | 2137 G1SATBProcessCompletedThreshold, |
342 | 2138 Shared_SATB_Q_lock); |
794 | 2139 |
2140 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2141 DirtyCardQ_FL_lock, | |
1111 | 2142 concurrent_g1_refine()->yellow_zone(), |
2143 concurrent_g1_refine()->red_zone(), | |
794 | 2144 Shared_DirtyCardQ_lock); |
2145 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
changeset
|
2146 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
changeset
|
2147 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
|
2148 DirtyCardQ_FL_lock, |
1111 | 2149 -1, // never trigger processing |
2150 -1, // no limit on length | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
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|
2151 Shared_DirtyCardQ_lock, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
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|
2152 &JavaThread::dirty_card_queue_set()); |
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iveresov
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diff
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|
2153 } |
1705 | 2154 |
2155 // Initialize the card queue set used to hold cards containing | |
2156 // references into the collection set. | |
2157 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2158 DirtyCardQ_FL_lock, | |
2159 -1, // never trigger processing | |
2160 -1, // no limit on length | |
2161 Shared_DirtyCardQ_lock, | |
2162 &JavaThread::dirty_card_queue_set()); | |
2163 | |
342 | 2164 // In case we're keeping closure specialization stats, initialize those |
2165 // counts and that mechanism. | |
2166 SpecializationStats::clear(); | |
2167 | |
2433
abdfc822206f
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2432
diff
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|
2168 // 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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|
2169 // G1AllocRegion class. If we don't pass an address in the reserved |
abdfc822206f
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tonyp
parents:
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diff
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|
2170 // space here, lots of asserts fire. |
3766 | 2171 |
2172 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2173 _g1_reserved.start()); | |
2433
abdfc822206f
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|
2174 // We'll re-use the same region whether the alloc region will |
abdfc822206f
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|
2175 // require BOT updates or not and, if it doesn't, then a non-young |
abdfc822206f
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|
2176 // region will complain that it cannot support allocations without |
abdfc822206f
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|
2177 // BOT updates. So we'll tag the dummy region as young to avoid that. |
abdfc822206f
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|
2178 dummy_region->set_young(); |
abdfc822206f
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|
2179 // Make sure it's full. |
abdfc822206f
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|
2180 dummy_region->set_top(dummy_region->end()); |
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|
2181 G1AllocRegion::setup(this, dummy_region); |
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|
2182 |
abdfc822206f
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diff
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|
2183 init_mutator_alloc_region(); |
abdfc822206f
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|
2184 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
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3285
diff
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|
2185 // Do create of the monitoring and management support so that |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
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diff
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|
2186 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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3979
diff
changeset
|
2187 _g1mm = new G1MonitoringSupport(this); |
3289
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|
2188 |
342 | 2189 return JNI_OK; |
2190 } | |
2191 | |
2192 void G1CollectedHeap::ref_processing_init() { | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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|
2193 // Reference processing in G1 currently works as follows: |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
2194 // |
3979
4dfb2df418f2
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|
2195 // * There are two reference processor instances. One is |
4dfb2df418f2
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diff
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|
2196 // used to record and process discovered references |
4dfb2df418f2
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|
2197 // during concurrent marking; the other is used to |
4dfb2df418f2
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diff
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|
2198 // record and process references during STW pauses |
4dfb2df418f2
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diff
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|
2199 // (both full and incremental). |
4dfb2df418f2
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parents:
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|
2200 // * Both ref processors need to 'span' the entire heap as |
4dfb2df418f2
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parents:
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diff
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|
2201 // the regions in the collection set may be dotted around. |
4dfb2df418f2
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diff
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|
2202 // |
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|
2203 // * For the concurrent marking ref processor: |
4dfb2df418f2
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diff
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|
2204 // * Reference discovery is enabled at initial marking. |
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|
2205 // * Reference discovery is disabled and the discovered |
4dfb2df418f2
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|
2206 // references processed etc during remarking. |
4dfb2df418f2
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|
2207 // * Reference discovery is MT (see below). |
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diff
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|
2208 // * Reference discovery requires a barrier (see below). |
4dfb2df418f2
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diff
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|
2209 // * Reference processing may or may not be MT |
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diff
changeset
|
2210 // (depending on the value of ParallelRefProcEnabled |
4dfb2df418f2
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parents:
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|
2211 // and ParallelGCThreads). |
4dfb2df418f2
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parents:
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diff
changeset
|
2212 // * A full GC disables reference discovery by the CM |
4dfb2df418f2
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parents:
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diff
changeset
|
2213 // ref processor and abandons any entries on it's |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2214 // discovered lists. |
4dfb2df418f2
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parents:
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diff
changeset
|
2215 // |
4dfb2df418f2
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parents:
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diff
changeset
|
2216 // * For the STW processor: |
4dfb2df418f2
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diff
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|
2217 // * Non MT discovery is enabled at the start of a full GC. |
4dfb2df418f2
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parents:
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|
2218 // * Processing and enqueueing during a full GC is non-MT. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2219 // * During a full GC, references are processed after marking. |
4dfb2df418f2
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johnc
parents:
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diff
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|
2220 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2221 // * Discovery (may or may not be MT) is enabled at the start |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2222 // of an incremental evacuation pause. |
4dfb2df418f2
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3973
diff
changeset
|
2223 // * References are processed near the end of a STW evacuation pause. |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2224 // * For both types of GC: |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2225 // * Discovery is atomic - i.e. not concurrent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2226 // * 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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|
2227 |
342 | 2228 SharedHeap::ref_processing_init(); |
2229 MemRegion mr = reserved_region(); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2230 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
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|
2231 // Concurrent Mark ref processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
2232 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2233 new ReferenceProcessor(mr, // span |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2234 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
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johnc
parents:
3973
diff
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|
2235 // mt processing |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2236 (int) ParallelGCThreads, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2237 // degree of mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2238 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2239 // mt discovery |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2240 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2241 // degree of mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2242 false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2243 // Reference discovery is not atomic |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2244 &_is_alive_closure_cm, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2245 // is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2246 // (for efficiency/performance) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
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|
2247 true); |
4dfb2df418f2
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3973
diff
changeset
|
2248 // Setting next fields of discovered |
4dfb2df418f2
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3973
diff
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|
2249 // lists requires a barrier. |
4dfb2df418f2
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parents:
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diff
changeset
|
2250 |
4dfb2df418f2
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3973
diff
changeset
|
2251 // STW ref processor |
4dfb2df418f2
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diff
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|
2252 _ref_processor_stw = |
4dfb2df418f2
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3973
diff
changeset
|
2253 new ReferenceProcessor(mr, // span |
4dfb2df418f2
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diff
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|
2254 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
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parents:
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diff
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|
2255 // mt processing |
4dfb2df418f2
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diff
changeset
|
2256 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2257 // degree of mt processing |
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diff
changeset
|
2258 (ParallelGCThreads > 1), |
4dfb2df418f2
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diff
changeset
|
2259 // mt discovery |
4dfb2df418f2
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diff
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|
2260 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
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parents:
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diff
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|
2261 // degree of mt discovery |
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parents:
3973
diff
changeset
|
2262 true, |
4dfb2df418f2
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diff
changeset
|
2263 // Reference discovery is atomic |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2264 &_is_alive_closure_stw, |
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3973
diff
changeset
|
2265 // is alive closure |
4dfb2df418f2
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diff
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|
2266 // (for efficiency/performance) |
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3973
diff
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|
2267 false); |
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diff
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|
2268 // Setting next fields of discovered |
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|
2269 // lists requires a barrier. |
342 | 2270 } |
2271 | |
2272 size_t G1CollectedHeap::capacity() const { | |
2273 return _g1_committed.byte_size(); | |
2274 } | |
2275 | |
6254
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|
2276 void G1CollectedHeap::reset_gc_time_stamps(HeapRegion* hr) { |
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|
2277 assert(!hr->continuesHumongous(), "pre-condition"); |
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|
2278 hr->reset_gc_time_stamp(); |
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|
2279 if (hr->startsHumongous()) { |
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|
2280 uint first_index = hr->hrs_index() + 1; |
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|
2281 uint last_index = hr->last_hc_index(); |
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|
2282 for (uint i = first_index; i < last_index; i += 1) { |
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|
2283 HeapRegion* chr = region_at(i); |
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|
2284 assert(chr->continuesHumongous(), "sanity"); |
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|
2285 chr->reset_gc_time_stamp(); |
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|
2286 } |
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|
2287 } |
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|
2288 } |
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|
2289 |
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|
2290 #ifndef PRODUCT |
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|
2291 class CheckGCTimeStampsHRClosure : public HeapRegionClosure { |
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2292 private: |
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2293 unsigned _gc_time_stamp; |
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2294 bool _failures; |
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2295 |
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2296 public: |
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2297 CheckGCTimeStampsHRClosure(unsigned gc_time_stamp) : |
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2298 _gc_time_stamp(gc_time_stamp), _failures(false) { } |
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2299 |
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|
2300 virtual bool doHeapRegion(HeapRegion* hr) { |
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2301 unsigned region_gc_time_stamp = hr->get_gc_time_stamp(); |
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2302 if (_gc_time_stamp != region_gc_time_stamp) { |
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2303 gclog_or_tty->print_cr("Region "HR_FORMAT" has GC time stamp = %d, " |
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2304 "expected %d", HR_FORMAT_PARAMS(hr), |
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2305 region_gc_time_stamp, _gc_time_stamp); |
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2306 _failures = true; |
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|
2307 } |
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|
2308 return false; |
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|
2309 } |
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2310 |
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2311 bool failures() { return _failures; } |
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2312 }; |
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|
2313 |
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2314 void G1CollectedHeap::check_gc_time_stamps() { |
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2315 CheckGCTimeStampsHRClosure cl(_gc_time_stamp); |
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2316 heap_region_iterate(&cl); |
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2317 guarantee(!cl.failures(), "all GC time stamps should have been reset"); |
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|
2318 } |
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2319 #endif // PRODUCT |
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|
2320 |
1705 | 2321 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2322 DirtyCardQueue* into_cset_dcq, | |
2323 bool concurrent, | |
342 | 2324 int worker_i) { |
889 | 2325 // Clean cards in the hot card cache |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
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|
2326 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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|
2327 hot_card_cache->drain(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2328 |
342 | 2329 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2330 int n_completed_buffers = 0; | |
1705 | 2331 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2332 n_completed_buffers++; |
2333 } | |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2334 g1_policy()->phase_times()->record_update_rs_processed_buffers(worker_i, n_completed_buffers); |
342 | 2335 dcqs.clear_n_completed_buffers(); |
2336 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2337 } | |
2338 | |
2339 | |
2340 // Computes the sum of the storage used by the various regions. | |
2341 | |
2342 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
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|
2343 assert(Heap_lock->owner() != NULL, |
36b5611220a7
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diff
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|
2344 "Should be owned on this thread's behalf."); |
342 | 2345 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2346 // Read only once in case it is set to NULL concurrently |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2347 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2348 if (hr != NULL) |
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|
2349 result += hr->used(); |
342 | 2350 return result; |
2351 } | |
2352 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2353 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2354 size_t result = _summary_bytes_used; |
42d84bbbecf4
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|
2355 return result; |
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6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2356 } |
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|
2357 |
342 | 2358 class SumUsedClosure: public HeapRegionClosure { |
2359 size_t _used; | |
2360 public: | |
2361 SumUsedClosure() : _used(0) {} | |
2362 bool doHeapRegion(HeapRegion* r) { | |
2363 if (!r->continuesHumongous()) { | |
2364 _used += r->used(); | |
2365 } | |
2366 return false; | |
2367 } | |
2368 size_t result() { return _used; } | |
2369 }; | |
2370 | |
2371 size_t G1CollectedHeap::recalculate_used() const { | |
2372 SumUsedClosure blk; | |
3766 | 2373 heap_region_iterate(&blk); |
342 | 2374 return blk.result(); |
2375 } | |
2376 | |
2377 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2378 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2379 // otherwise, is there space in the current allocation region? |
2380 | |
2381 // We need to store the current allocation region in a local variable | |
2382 // here. The problem is that this method doesn't take any locks and | |
2383 // there may be other threads which overwrite the current allocation | |
2384 // region field. attempt_allocation(), for example, sets it to NULL | |
2385 // and this can happen *after* the NULL check here but before the call | |
2386 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2387 // to be a problem in the optimized build, since the two loads of the | |
2388 // current allocation region field are optimized away. | |
2433
abdfc822206f
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|
2389 HeapRegion* hr = _mutator_alloc_region.get(); |
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diff
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|
2390 if (hr == NULL) { |
342 | 2391 return 0; |
2392 } | |
2433
abdfc822206f
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|
2393 return hr->free(); |
342 | 2394 } |
2395 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2396 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
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4875
diff
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|
2397 switch (cause) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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4875
diff
changeset
|
2398 case GCCause::_gc_locker: return GCLockerInvokesConcurrent; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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4875
diff
changeset
|
2399 case GCCause::_java_lang_system_gc: return ExplicitGCInvokesConcurrent; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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4875
diff
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|
2400 case GCCause::_g1_humongous_allocation: return true; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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4875
diff
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|
2401 default: return false; |
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4875
diff
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|
2402 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2403 } |
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1611
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|
2404 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
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2433
diff
changeset
|
2405 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
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2433
diff
changeset
|
2406 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
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2433
diff
changeset
|
2407 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
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2433
diff
changeset
|
2408 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2409 // 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
|
2410 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2411 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2412 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2413 // Let's use the existing mechanism for the allocation |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2414 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2415 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2416 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2417 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2418 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2419 // 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
|
2420 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2421 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2422 } |
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
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2433
diff
changeset
|
2424 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2425 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2426 |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2427 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
|
2428 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
|
2429 _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
|
2430 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
|
2431 _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
|
2432 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2433 _old_marking_cycles_started++; |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2434 } |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2435 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2436 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
|
2437 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2438 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2439 // 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
|
2440 // 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
|
2441 // 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
|
2442 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2443 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2444 // 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
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1611
diff
changeset
|
2445 // concurrent cycle, and those can be nested (i.e., a Full GC can |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2446 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2447 // completed should be either one (in the case where there was no |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2448 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2449 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2450 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2451 // 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
|
2452 assert(concurrent || |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2453 (_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
|
2454 (_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
|
2455 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
|
2456 "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
|
2457 _old_marking_cycles_started, _old_marking_cycles_completed)); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2458 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2459 // 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
|
2460 assert(!concurrent || |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2461 (_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
|
2462 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
|
2463 "_old_marking_cycles_started = %u " |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2464 "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
|
2465 _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
|
2466 |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2467 _old_marking_cycles_completed += 1; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2468 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2469 // 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
|
2470 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2471 // is set) so that if a waiter requests another System.gc() it doesn't |
10405 | 2472 // 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
|
2473 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2474 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2475 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2476 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2477 // 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
|
2478 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2479 // 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
|
2480 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2481 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2482 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2483 |
10405 | 2484 void G1CollectedHeap::register_concurrent_cycle_start(jlong start_time) { |
2485 _concurrent_cycle_started = true; | |
2486 _gc_timer_cm->register_gc_start(start_time); | |
2487 | |
2488 _gc_tracer_cm->report_gc_start(gc_cause(), _gc_timer_cm->gc_start()); | |
2489 trace_heap_before_gc(_gc_tracer_cm); | |
2490 } | |
2491 | |
2492 void G1CollectedHeap::register_concurrent_cycle_end() { | |
2493 if (_concurrent_cycle_started) { | |
2494 _gc_timer_cm->register_gc_end(os::elapsed_counter()); | |
2495 | |
2496 if (_cm->has_aborted()) { | |
2497 _gc_tracer_cm->report_concurrent_mode_failure(); | |
2498 } | |
2499 _gc_tracer_cm->report_gc_end(_gc_timer_cm->gc_end(), _gc_timer_cm->time_partitions()); | |
2500 | |
2501 _concurrent_cycle_started = false; | |
2502 } | |
2503 } | |
2504 | |
2505 void G1CollectedHeap::trace_heap_after_concurrent_cycle() { | |
2506 if (_concurrent_cycle_started) { | |
2507 trace_heap_after_gc(_gc_tracer_cm); | |
2508 } | |
2509 } | |
2510 | |
2511 G1YCType G1CollectedHeap::yc_type() { | |
2512 bool is_young = g1_policy()->gcs_are_young(); | |
2513 bool is_initial_mark = g1_policy()->during_initial_mark_pause(); | |
2514 bool is_during_mark = mark_in_progress(); | |
2515 | |
2516 if (is_initial_mark) { | |
2517 return InitialMark; | |
2518 } else if (is_during_mark) { | |
2519 return DuringMark; | |
2520 } else if (is_young) { | |
2521 return Normal; | |
2522 } else { | |
2523 return Mixed; | |
2524 } | |
2525 } | |
2526 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2527 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
|
2528 assert_heap_not_locked(); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2529 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2530 unsigned int gc_count_before; |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2531 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
|
2532 bool retry_gc; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2533 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2534 do { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2535 retry_gc = false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2536 |
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 MutexLocker ml(Heap_lock); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2539 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2540 // 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
|
2541 gc_count_before = total_collections(); |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2542 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
|
2543 } |
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 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
|
2546 // 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
|
2547 // 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
|
2548 // we are not requesting a post-GC allocation. |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2549 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2550 0, /* word_size */ |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2551 true, /* should_initiate_conc_mark */ |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2552 g1_policy()->max_pause_time_ms(), |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2553 cause); |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2554 |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2555 VMThread::execute(&op); |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2556 if (!op.pause_succeeded()) { |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2557 if (old_marking_count_before == _old_marking_cycles_started) { |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2558 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
|
2559 } else { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2560 // 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
|
2561 // 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
|
2562 // 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
|
2563 } |
5963
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2564 |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2565 if (retry_gc) { |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2566 if (GC_locker::is_active_and_needs_gc()) { |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2567 GC_locker::stall_until_clear(); |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2568 } |
64bf7c8270cb
7147724: G1: hang in SurrogateLockerThread::manipulatePLL
johnc
parents:
4912
diff
changeset
|
2569 } |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2570 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2571 } else { |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2572 if (cause == GCCause::_gc_locker |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2573 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
|
2574 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2575 // 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
|
2576 // 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
|
2577 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
|
2578 0, /* word_size */ |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2579 false, /* should_initiate_conc_mark */ |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2580 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
|
2581 cause); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2582 VMThread::execute(&op); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2583 } else { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2584 // Schedule a Full GC. |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2585 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
|
2586 VMThread::execute(&op); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2587 } |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2588 } |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2589 } while (retry_gc); |
342 | 2590 } |
2591 | |
2592 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2593 if (_g1_committed.contains(p)) { |
2594 // Given that we know that p is in the committed space, | |
2595 // heap_region_containing_raw() should successfully | |
2596 // return the containing region. | |
2597 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2598 return hr->is_in(p); |
2599 } else { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2600 return false; |
342 | 2601 } |
2602 } | |
2603 | |
2604 // Iteration functions. | |
2605 | |
2606 // Iterates an OopClosure over all ref-containing fields of objects | |
2607 // within a HeapRegion. | |
2608 | |
2609 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2610 MemRegion _mr; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2611 ExtendedOopClosure* _cl; |
342 | 2612 public: |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2613 IterateOopClosureRegionClosure(MemRegion mr, ExtendedOopClosure* cl) |
342 | 2614 : _mr(mr), _cl(cl) {} |
2615 bool doHeapRegion(HeapRegion* r) { | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2616 if (!r->continuesHumongous()) { |
342 | 2617 r->oop_iterate(_cl); |
2618 } | |
2619 return false; | |
2620 } | |
2621 }; | |
2622 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2623 void G1CollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
342 | 2624 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2625 heap_region_iterate(&blk); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2626 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2627 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2628 void G1CollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
342 | 2629 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2630 heap_region_iterate(&blk); |
342 | 2631 } |
2632 | |
2633 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2634 | |
2635 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2636 ObjectClosure* _cl; | |
2637 public: | |
2638 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2639 bool doHeapRegion(HeapRegion* r) { | |
2640 if (! r->continuesHumongous()) { | |
2641 r->object_iterate(_cl); | |
2642 } | |
2643 return false; | |
2644 } | |
2645 }; | |
2646 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
2647 void G1CollectedHeap::object_iterate(ObjectClosure* cl) { |
342 | 2648 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2649 heap_region_iterate(&blk); |
342 | 2650 } |
2651 | |
2652 // Calls a SpaceClosure on a HeapRegion. | |
2653 | |
2654 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2655 SpaceClosure* _cl; | |
2656 public: | |
2657 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2658 bool doHeapRegion(HeapRegion* r) { | |
2659 _cl->do_space(r); | |
2660 return false; | |
2661 } | |
2662 }; | |
2663 | |
2664 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2665 SpaceClosureRegionClosure blk(cl); | |
3766 | 2666 heap_region_iterate(&blk); |
342 | 2667 } |
2668 | |
3766 | 2669 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2670 _hrs.iterate(cl); | |
342 | 2671 } |
2672 | |
2673 void | |
2674 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
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2675 uint worker_id, |
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2676 uint no_of_par_workers, |
342 | 2677 jint claim_value) { |
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2678 const uint regions = n_regions(); |
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2679 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2680 no_of_par_workers : |
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2681 1); |
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2682 assert(UseDynamicNumberOfGCThreads || |
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2683 no_of_par_workers == workers()->total_workers(), |
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2684 "Non dynamic should use fixed number of workers"); |
355 | 2685 // try to spread out the starting points of the workers |
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2686 const HeapRegion* start_hr = |
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2687 start_region_for_worker(worker_id, no_of_par_workers); |
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2688 const uint start_index = start_hr->hrs_index(); |
355 | 2689 |
2690 // each worker will actually look at all regions | |
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2691 for (uint count = 0; count < regions; ++count) { |
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2692 const uint index = (start_index + count) % regions; |
355 | 2693 assert(0 <= index && index < regions, "sanity"); |
2694 HeapRegion* r = region_at(index); | |
2695 // we'll ignore "continues humongous" regions (we'll process them | |
2696 // when we come across their corresponding "start humongous" | |
2697 // region) and regions already claimed | |
2698 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2699 continue; | |
2700 } | |
2701 // OK, try to claim it | |
342 | 2702 if (r->claimHeapRegion(claim_value)) { |
355 | 2703 // success! |
2704 assert(!r->continuesHumongous(), "sanity"); | |
2705 if (r->startsHumongous()) { | |
2706 // If the region is "starts humongous" we'll iterate over its | |
2707 // "continues humongous" first; in fact we'll do them | |
2708 // first. The order is important. In on case, calling the | |
2709 // closure on the "starts humongous" region might de-allocate | |
2710 // and clear all its "continues humongous" regions and, as a | |
2711 // result, we might end up processing them twice. So, we'll do | |
2712 // them first (notice: most closures will ignore them anyway) and | |
2713 // then we'll do the "starts humongous" region. | |
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2714 for (uint ch_index = index + 1; ch_index < regions; ++ch_index) { |
355 | 2715 HeapRegion* chr = region_at(ch_index); |
2716 | |
2717 // if the region has already been claimed or it's not | |
2718 // "continues humongous" we're done | |
2719 if (chr->claim_value() == claim_value || | |
2720 !chr->continuesHumongous()) { | |
2721 break; | |
2722 } | |
2723 | |
10405 | 2724 // No one should have claimed it directly. We can given |
355 | 2725 // that we claimed its "starts humongous" region. |
2726 assert(chr->claim_value() != claim_value, "sanity"); | |
2727 assert(chr->humongous_start_region() == r, "sanity"); | |
2728 | |
2729 if (chr->claimHeapRegion(claim_value)) { | |
10405 | 2730 // we should always be able to claim it; no one else should |
355 | 2731 // be trying to claim this region |
2732 | |
2733 bool res2 = cl->doHeapRegion(chr); | |
2734 assert(!res2, "Should not abort"); | |
2735 | |
2736 // Right now, this holds (i.e., no closure that actually | |
2737 // does something with "continues humongous" regions | |
2738 // clears them). We might have to weaken it in the future, | |
2739 // but let's leave these two asserts here for extra safety. | |
2740 assert(chr->continuesHumongous(), "should still be the case"); | |
2741 assert(chr->humongous_start_region() == r, "sanity"); | |
2742 } else { | |
2743 guarantee(false, "we should not reach here"); | |
2744 } | |
2745 } | |
2746 } | |
2747 | |
2748 assert(!r->continuesHumongous(), "sanity"); | |
2749 bool res = cl->doHeapRegion(r); | |
2750 assert(!res, "Should not abort"); | |
2751 } | |
2752 } | |
2753 } | |
2754 | |
390 | 2755 class ResetClaimValuesClosure: public HeapRegionClosure { |
2756 public: | |
2757 bool doHeapRegion(HeapRegion* r) { | |
2758 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2759 return false; | |
2760 } | |
2761 }; | |
2762 | |
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2763 void G1CollectedHeap::reset_heap_region_claim_values() { |
390 | 2764 ResetClaimValuesClosure blk; |
2765 heap_region_iterate(&blk); | |
2766 } | |
2767 | |
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2768 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2769 ResetClaimValuesClosure blk; |
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2770 collection_set_iterate(&blk); |
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|
2771 } |
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2772 |
355 | 2773 #ifdef ASSERT |
2774 // This checks whether all regions in the heap have the correct claim | |
2775 // value. I also piggy-backed on this a check to ensure that the | |
2776 // humongous_start_region() information on "continues humongous" | |
2777 // regions is correct. | |
2778 | |
2779 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2780 private: | |
2781 jint _claim_value; | |
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2782 uint _failures; |
355 | 2783 HeapRegion* _sh_region; |
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2784 |
355 | 2785 public: |
2786 CheckClaimValuesClosure(jint claim_value) : | |
2787 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2788 bool doHeapRegion(HeapRegion* r) { | |
2789 if (r->claim_value() != _claim_value) { | |
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2790 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2791 "claim value = %d, should be %d", |
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2792 HR_FORMAT_PARAMS(r), |
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|
2793 r->claim_value(), _claim_value); |
355 | 2794 ++_failures; |
2795 } | |
2796 if (!r->isHumongous()) { | |
2797 _sh_region = NULL; | |
2798 } else if (r->startsHumongous()) { | |
2799 _sh_region = r; | |
2800 } else if (r->continuesHumongous()) { | |
2801 if (r->humongous_start_region() != _sh_region) { | |
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2802 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2803 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2804 HR_FORMAT_PARAMS(r), |
355 | 2805 r->humongous_start_region(), |
2806 _sh_region); | |
2807 ++_failures; | |
342 | 2808 } |
2809 } | |
355 | 2810 return false; |
2811 } | |
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2812 uint failures() { return _failures; } |
355 | 2813 }; |
2814 | |
2815 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2816 CheckClaimValuesClosure cl(claim_value); | |
2817 heap_region_iterate(&cl); | |
2818 return cl.failures() == 0; | |
2819 } | |
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2820 |
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2821 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2822 private: |
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|
2823 jint _claim_value; |
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2824 uint _failures; |
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|
2825 |
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|
2826 public: |
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|
2827 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2828 _claim_value(claim_value), _failures(0) { } |
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2829 |
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|
2830 uint failures() { return _failures; } |
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|
2831 |
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|
2832 bool doHeapRegion(HeapRegion* hr) { |
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2833 assert(hr->in_collection_set(), "how?"); |
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|
2834 assert(!hr->isHumongous(), "H-region in CSet"); |
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|
2835 if (hr->claim_value() != _claim_value) { |
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2836 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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|
2837 "claim value = %d, should be %d", |
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|
2838 HR_FORMAT_PARAMS(hr), |
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|
2839 hr->claim_value(), _claim_value); |
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|
2840 _failures += 1; |
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|
2841 } |
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|
2842 return false; |
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|
2843 } |
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|
2844 }; |
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|
2845 |
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|
2846 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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|
2847 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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|
2848 collection_set_iterate(&cl); |
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|
2849 return cl.failures() == 0; |
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2850 } |
355 | 2851 #endif // ASSERT |
342 | 2852 |
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2853 // Clear the cached CSet starting regions and (more importantly) |
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2854 // the time stamps. Called when we reset the GC time stamp. |
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2855 void G1CollectedHeap::clear_cset_start_regions() { |
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|
2856 assert(_worker_cset_start_region != NULL, "sanity"); |
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|
2857 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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|
2858 |
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|
2859 int n_queues = MAX2((int)ParallelGCThreads, 1); |
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|
2860 for (int i = 0; i < n_queues; i++) { |
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|
2861 _worker_cset_start_region[i] = NULL; |
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|
2862 _worker_cset_start_region_time_stamp[i] = 0; |
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|
2863 } |
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|
2864 } |
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|
2865 |
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|
2866 // Given the id of a worker, obtain or calculate a suitable |
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2867 // starting region for iterating over the current collection set. |
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2868 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
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2869 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
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|
2870 |
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|
2871 HeapRegion* result = NULL; |
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|
2872 unsigned gc_time_stamp = get_gc_time_stamp(); |
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|
2873 |
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|
2874 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
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|
2875 // Cached starting region for current worker was set |
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|
2876 // during the current pause - so it's valid. |
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|
2877 // Note: the cached starting heap region may be NULL |
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|
2878 // (when the collection set is empty). |
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changeset
|
2879 result = _worker_cset_start_region[worker_i]; |
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|
2880 assert(result == NULL || result->in_collection_set(), "sanity"); |
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|
2881 return result; |
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4708
diff
changeset
|
2882 } |
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 // 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
|
2885 // 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
|
2886 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2887 // 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
|
2888 // 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
|
2889 // avoid contention. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2890 // If we have: |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2891 // n collection set regions |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2892 // p threads |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2893 // 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
|
2894 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2895 result = g1_policy()->collection_set(); |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2896 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2897 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
|
2898 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
|
2899 assert(UseDynamicNumberOfGCThreads || |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2900 active_workers == workers()->total_workers(), |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2901 "Unless dynamic should use total workers"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2902 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2903 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
|
2904 uint start_ind = 0; |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2905 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2906 if (worker_i > 0 && |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2907 _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
|
2908 // Previous workers starting region is valid |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2909 // so let's iterate from there |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2910 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
|
2911 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
|
2912 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2913 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2914 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
|
2915 result = result->next_in_collection_set(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2916 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2917 } |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2918 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2919 // 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
|
2920 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2921 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
|
2922 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
|
2923 "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
|
2924 _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
|
2925 OrderAccess::storestore(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2926 _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
|
2927 return result; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2928 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2929 |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2930 HeapRegion* G1CollectedHeap::start_region_for_worker(uint worker_i, |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2931 uint no_of_par_workers) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2932 uint worker_num = |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2933 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
|
2934 assert(UseDynamicNumberOfGCThreads || |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2935 no_of_par_workers == workers()->total_workers(), |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2936 "Non dynamic should use fixed number of workers"); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2937 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
|
2938 return region_at(start_index); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2939 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2940 |
342 | 2941 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2942 HeapRegion* r = g1_policy()->collection_set(); | |
2943 while (r != NULL) { | |
2944 HeapRegion* next = r->next_in_collection_set(); | |
2945 if (cl->doHeapRegion(r)) { | |
2946 cl->incomplete(); | |
2947 return; | |
2948 } | |
2949 r = next; | |
2950 } | |
2951 } | |
2952 | |
2953 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2954 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2955 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2956 // 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
|
2957 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2958 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2959 |
342 | 2960 assert(r->in_collection_set(), |
2961 "Start region must be a member of the collection set."); | |
2962 HeapRegion* cur = r; | |
2963 while (cur != NULL) { | |
2964 HeapRegion* next = cur->next_in_collection_set(); | |
2965 if (cl->doHeapRegion(cur) && false) { | |
2966 cl->incomplete(); | |
2967 return; | |
2968 } | |
2969 cur = next; | |
2970 } | |
2971 cur = g1_policy()->collection_set(); | |
2972 while (cur != r) { | |
2973 HeapRegion* next = cur->next_in_collection_set(); | |
2974 if (cl->doHeapRegion(cur) && false) { | |
2975 cl->incomplete(); | |
2976 return; | |
2977 } | |
2978 cur = next; | |
2979 } | |
2980 } | |
2981 | |
2982 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2983 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2984 } |
2985 | |
2986 | |
2987 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2988 Space* res = heap_region_containing(addr); | |
2989 return res; | |
2990 } | |
2991 | |
2992 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2993 Space* sp = space_containing(addr); | |
2994 if (sp != NULL) { | |
2995 return sp->block_start(addr); | |
2996 } | |
2997 return NULL; | |
2998 } | |
2999 | |
3000 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
3001 Space* sp = space_containing(addr); | |
3002 assert(sp != NULL, "block_size of address outside of heap"); | |
3003 return sp->block_size(addr); | |
3004 } | |
3005 | |
3006 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
3007 Space* sp = space_containing(addr); | |
3008 return sp->block_is_obj(addr); | |
3009 } | |
3010 | |
3011 bool G1CollectedHeap::supports_tlab_allocation() const { | |
3012 return true; | |
3013 } | |
3014 | |
3015 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
3016 return HeapRegion::GrainBytes; | |
3017 } | |
3018 | |
3019 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
3020 // Return the remaining space in the cur alloc region, but not less than | |
3021 // the min TLAB size. | |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3022 |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3023 // Also, this value can be at most the humongous object threshold, |
10405 | 3024 // 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
|
3025 // humongous objects. |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3026 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3027 HeapRegion* hr = _mutator_alloc_region.get(); |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3028 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
|
3029 if (hr == NULL) { |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
3030 return max_tlab_size; |
342 | 3031 } else { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3032 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 3033 } |
3034 } | |
3035 | |
3036 size_t G1CollectedHeap::max_capacity() const { | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3037 return _g1_reserved.byte_size(); |
342 | 3038 } |
3039 | |
3040 jlong G1CollectedHeap::millis_since_last_gc() { | |
3041 // assert(false, "NYI"); | |
3042 return 0; | |
3043 } | |
3044 | |
3045 void G1CollectedHeap::prepare_for_verify() { | |
3046 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
3047 ensure_parsability(false); | |
3048 } | |
3049 g1_rem_set()->prepare_for_verify(); | |
3050 } | |
3051 | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
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|
3052 bool G1CollectedHeap::allocated_since_marking(oop obj, HeapRegion* hr, |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
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|
3053 VerifyOption vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3054 switch (vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3055 case VerifyOption_G1UsePrevMarking: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3056 return hr->obj_allocated_since_prev_marking(obj); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3057 case VerifyOption_G1UseNextMarking: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3058 return hr->obj_allocated_since_next_marking(obj); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3059 case VerifyOption_G1UseMarkWord: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3060 return false; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3061 default: |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3062 ShouldNotReachHere(); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3063 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3064 return false; // keep some compilers happy |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3065 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3066 |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3067 HeapWord* G1CollectedHeap::top_at_mark_start(HeapRegion* hr, VerifyOption vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3068 switch (vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3069 case VerifyOption_G1UsePrevMarking: return hr->prev_top_at_mark_start(); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3070 case VerifyOption_G1UseNextMarking: return hr->next_top_at_mark_start(); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3071 case VerifyOption_G1UseMarkWord: return NULL; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3072 default: ShouldNotReachHere(); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3073 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3074 return NULL; // keep some compilers happy |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3075 } |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3076 |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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parents:
6220
diff
changeset
|
3077 bool G1CollectedHeap::is_marked(oop obj, VerifyOption vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3078 switch (vo) { |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
3079 case VerifyOption_G1UsePrevMarking: return isMarkedPrev(obj); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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3080 case VerifyOption_G1UseNextMarking: return isMarkedNext(obj); |
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3081 case VerifyOption_G1UseMarkWord: return obj->is_gc_marked(); |
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3082 default: ShouldNotReachHere(); |
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3083 } |
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3084 return false; // keep some compilers happy |
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3085 } |
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3086 |
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3087 const char* G1CollectedHeap::top_at_mark_start_str(VerifyOption vo) { |
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3088 switch (vo) { |
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3089 case VerifyOption_G1UsePrevMarking: return "PTAMS"; |
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3090 case VerifyOption_G1UseNextMarking: return "NTAMS"; |
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3091 case VerifyOption_G1UseMarkWord: return "NONE"; |
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3092 default: ShouldNotReachHere(); |
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3093 } |
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3094 return NULL; // keep some compilers happy |
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3095 } |
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3096 |
12080 | 3097 // TODO: VerifyRootsClosure extends OopsInGenClosure so that we can |
3098 // pass it as the perm_blk to SharedHeap::process_strong_roots. | |
3099 // When process_strong_roots stop calling perm_blk->younger_refs_iterate | |
3100 // we can change this closure to extend the simpler OopClosure. | |
3101 class VerifyRootsClosure: public OopsInGenClosure { | |
3102 private: | |
3103 G1CollectedHeap* _g1h; | |
3104 VerifyOption _vo; | |
3105 bool _failures; | |
3106 public: | |
3107 // _vo == UsePrevMarking -> use "prev" marking information, | |
3108 // _vo == UseNextMarking -> use "next" marking information, | |
3109 // _vo == UseMarkWord -> use mark word from object header. | |
3110 VerifyRootsClosure(VerifyOption vo) : | |
3111 _g1h(G1CollectedHeap::heap()), | |
3112 _vo(vo), | |
3113 _failures(false) { } | |
3114 | |
3115 bool failures() { return _failures; } | |
3116 | |
3117 template <class T> void do_oop_nv(T* p) { | |
3118 T heap_oop = oopDesc::load_heap_oop(p); | |
3119 if (!oopDesc::is_null(heap_oop)) { | |
3120 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
3121 if (_g1h->is_obj_dead_cond(obj, _vo)) { | |
3122 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " | |
3123 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
3124 if (_vo == VerifyOption_G1UseMarkWord) { | |
3125 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); | |
3126 } | |
3127 obj->print_on(gclog_or_tty); | |
3128 _failures = true; | |
3129 } | |
3130 } | |
3131 } | |
3132 | |
3133 void do_oop(oop* p) { do_oop_nv(p); } | |
3134 void do_oop(narrowOop* p) { do_oop_nv(p); } | |
3135 }; | |
3136 | |
3137 class G1VerifyCodeRootOopClosure: public OopsInGenClosure { | |
3138 G1CollectedHeap* _g1h; | |
3139 OopClosure* _root_cl; | |
3140 nmethod* _nm; | |
3141 VerifyOption _vo; | |
3142 bool _failures; | |
3143 | |
3144 template <class T> void do_oop_work(T* p) { | |
3145 // First verify that this root is live | |
3146 _root_cl->do_oop(p); | |
3147 | |
3148 if (!G1VerifyHeapRegionCodeRoots) { | |
3149 // We're not verifying the code roots attached to heap region. | |
3150 return; | |
3151 } | |
3152 | |
3153 // Don't check the code roots during marking verification in a full GC | |
3154 if (_vo == VerifyOption_G1UseMarkWord) { | |
3155 return; | |
3156 } | |
3157 | |
3158 // Now verify that the current nmethod (which contains p) is | |
3159 // in the code root list of the heap region containing the | |
3160 // object referenced by p. | |
3161 | |
3162 T heap_oop = oopDesc::load_heap_oop(p); | |
3163 if (!oopDesc::is_null(heap_oop)) { | |
3164 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
3165 | |
3166 // Now fetch the region containing the object | |
3167 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
3168 HeapRegionRemSet* hrrs = hr->rem_set(); | |
3169 // Verify that the strong code root list for this region | |
3170 // contains the nmethod | |
3171 if (!hrrs->strong_code_roots_list_contains(_nm)) { | |
3172 gclog_or_tty->print_cr("Code root location "PTR_FORMAT" " | |
3173 "from nmethod "PTR_FORMAT" not in strong " | |
3174 "code roots for region ["PTR_FORMAT","PTR_FORMAT")", | |
3175 p, _nm, hr->bottom(), hr->end()); | |
3176 _failures = true; | |
3177 } | |
3178 } | |
3179 } | |
3180 | |
3181 public: | |
3182 G1VerifyCodeRootOopClosure(G1CollectedHeap* g1h, OopClosure* root_cl, VerifyOption vo): | |
3183 _g1h(g1h), _root_cl(root_cl), _vo(vo), _nm(NULL), _failures(false) {} | |
3184 | |
3185 void do_oop(oop* p) { do_oop_work(p); } | |
3186 void do_oop(narrowOop* p) { do_oop_work(p); } | |
3187 | |
3188 void set_nmethod(nmethod* nm) { _nm = nm; } | |
3189 bool failures() { return _failures; } | |
3190 }; | |
3191 | |
3192 class G1VerifyCodeRootBlobClosure: public CodeBlobClosure { | |
3193 G1VerifyCodeRootOopClosure* _oop_cl; | |
3194 | |
3195 public: | |
3196 G1VerifyCodeRootBlobClosure(G1VerifyCodeRootOopClosure* oop_cl): | |
3197 _oop_cl(oop_cl) {} | |
3198 | |
3199 void do_code_blob(CodeBlob* cb) { | |
3200 nmethod* nm = cb->as_nmethod_or_null(); | |
3201 if (nm != NULL) { | |
3202 _oop_cl->set_nmethod(nm); | |
3203 nm->oops_do(_oop_cl); | |
3204 } | |
3205 } | |
3206 }; | |
3207 | |
3208 class YoungRefCounterClosure : public OopClosure { | |
3209 G1CollectedHeap* _g1h; | |
3210 int _count; | |
3211 public: | |
3212 YoungRefCounterClosure(G1CollectedHeap* g1h) : _g1h(g1h), _count(0) {} | |
3213 void do_oop(oop* p) { if (_g1h->is_in_young(*p)) { _count++; } } | |
3214 void do_oop(narrowOop* p) { ShouldNotReachHere(); } | |
3215 | |
3216 int count() { return _count; } | |
3217 void reset_count() { _count = 0; }; | |
3218 }; | |
3219 | |
3220 class VerifyKlassClosure: public KlassClosure { | |
3221 YoungRefCounterClosure _young_ref_counter_closure; | |
3222 OopClosure *_oop_closure; | |
3223 public: | |
3224 VerifyKlassClosure(G1CollectedHeap* g1h, OopClosure* cl) : _young_ref_counter_closure(g1h), _oop_closure(cl) {} | |
3225 void do_klass(Klass* k) { | |
3226 k->oops_do(_oop_closure); | |
3227 | |
3228 _young_ref_counter_closure.reset_count(); | |
3229 k->oops_do(&_young_ref_counter_closure); | |
3230 if (_young_ref_counter_closure.count() > 0) { | |
3231 guarantee(k->has_modified_oops(), err_msg("Klass %p, has young refs but is not dirty.", k)); | |
3232 } | |
3233 } | |
3234 }; | |
3235 | |
342 | 3236 class VerifyLivenessOopClosure: public OopClosure { |
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3237 G1CollectedHeap* _g1h; |
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3238 VerifyOption _vo; |
342 | 3239 public: |
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3240 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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3241 _g1h(g1h), _vo(vo) |
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3242 { } |
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3243 void do_oop(narrowOop *p) { do_oop_work(p); } |
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3244 void do_oop( oop *p) { do_oop_work(p); } |
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3245 |
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3246 template <class T> void do_oop_work(T *p) { |
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3247 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
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3248 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
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3249 "Dead object referenced by a not dead object"); |
342 | 3250 } |
3251 }; | |
3252 | |
3253 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 3254 private: |
342 | 3255 G1CollectedHeap* _g1h; |
3256 size_t _live_bytes; | |
3257 HeapRegion *_hr; | |
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3258 VerifyOption _vo; |
342 | 3259 public: |
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3260 // _vo == UsePrevMarking -> use "prev" marking information, |
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3261 // _vo == UseNextMarking -> use "next" marking information, |
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3262 // _vo == UseMarkWord -> use mark word from object header. |
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3263 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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3264 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 3265 _g1h = G1CollectedHeap::heap(); |
3266 } | |
3267 void do_object(oop o) { | |
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3268 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 3269 assert(o != NULL, "Huh?"); |
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3270 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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3271 // If the object is alive according to the mark word, |
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3272 // then verify that the marking information agrees. |
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3273 // Note we can't verify the contra-positive of the |
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3274 // above: if the object is dead (according to the mark |
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3275 // word), it may not be marked, or may have been marked |
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3276 // but has since became dead, or may have been allocated |
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3277 // since the last marking. |
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3278 if (_vo == VerifyOption_G1UseMarkWord) { |
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3279 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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3280 } |
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|
3281 |
6725
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3282 o->oop_iterate_no_header(&isLive); |
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3283 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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3284 size_t obj_size = o->size(); // Make sure we don't overflow |
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3285 _live_bytes += (obj_size * HeapWordSize); |
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3286 } |
342 | 3287 } |
3288 } | |
3289 size_t live_bytes() { return _live_bytes; } | |
3290 }; | |
3291 | |
3292 class PrintObjsInRegionClosure : public ObjectClosure { | |
3293 HeapRegion *_hr; | |
3294 G1CollectedHeap *_g1; | |
3295 public: | |
3296 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
3297 _g1 = G1CollectedHeap::heap(); | |
3298 }; | |
3299 | |
3300 void do_object(oop o) { | |
3301 if (o != NULL) { | |
3302 HeapWord *start = (HeapWord *) o; | |
3303 size_t word_sz = o->size(); | |
3304 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
3305 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
3306 (void*) o, word_sz, | |
3307 _g1->isMarkedPrev(o), | |
3308 _g1->isMarkedNext(o), | |
3309 _hr->obj_allocated_since_prev_marking(o)); | |
3310 HeapWord *end = start + word_sz; | |
3311 HeapWord *cur; | |
3312 int *val; | |
3313 for (cur = start; cur < end; cur++) { | |
3314 val = (int *) cur; | |
3315 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
3316 } | |
3317 } | |
3318 } | |
3319 }; | |
3320 | |
3321 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 3322 private: |
6254
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3323 bool _par; |
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3324 VerifyOption _vo; |
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3325 bool _failures; |
811 | 3326 public: |
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3327 // _vo == UsePrevMarking -> use "prev" marking information, |
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3328 // _vo == UseNextMarking -> use "next" marking information, |
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3329 // _vo == UseMarkWord -> use mark word from object header. |
6008 | 3330 VerifyRegionClosure(bool par, VerifyOption vo) |
3331 : _par(par), | |
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3332 _vo(vo), |
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3333 _failures(false) {} |
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3334 |
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3335 bool failures() { |
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3336 return _failures; |
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3337 } |
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3338 |
342 | 3339 bool doHeapRegion(HeapRegion* r) { |
637
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3340 if (!r->continuesHumongous()) { |
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3341 bool failures = false; |
6008 | 3342 r->verify(_vo, &failures); |
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3343 if (failures) { |
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3344 _failures = true; |
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3345 } else { |
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3346 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
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3347 r->object_iterate(¬_dead_yet_cl); |
4787
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3348 if (_vo != VerifyOption_G1UseNextMarking) { |
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3349 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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3350 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
3351 "max_live_bytes "SIZE_FORMAT" " |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3352 "< calculated "SIZE_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3353 r->bottom(), r->end(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3354 r->max_live_bytes(), |
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|
3355 not_dead_yet_cl.live_bytes()); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3356 _failures = true; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
3357 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3358 } else { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3359 // When vo == UseNextMarking we cannot currently do a sanity |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
3360 // check on the live bytes as the calculation has not been |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3361 // finalized yet. |
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|
3362 } |
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|
3363 } |
342 | 3364 } |
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|
3365 return false; // stop the region iteration if we hit a failure |
342 | 3366 } |
3367 }; | |
3368 | |
12080 | 3369 // This is the task used for parallel verification of the heap regions |
390 | 3370 |
3371 class G1ParVerifyTask: public AbstractGangTask { | |
3372 private: | |
3373 G1CollectedHeap* _g1h; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3374 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3375 bool _failures; |
390 | 3376 |
3377 public: | |
3772
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|
3378 // _vo == UsePrevMarking -> use "prev" marking information, |
6747fd0512e0
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|
3379 // _vo == UseNextMarking -> use "next" marking information, |
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|
3380 // _vo == UseMarkWord -> use mark word from object header. |
6008 | 3381 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) : |
390 | 3382 AbstractGangTask("Parallel verify task"), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
3383 _g1h(g1h), |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3384 _vo(vo), |
1020
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diff
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|
3385 _failures(false) { } |
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|
3386 |
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|
3387 bool failures() { |
ff2402f6a50b
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|
3388 return _failures; |
ff2402f6a50b
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|
3389 } |
390 | 3390 |
4728
441e946dc1af
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|
3391 void work(uint worker_id) { |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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diff
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|
3392 HandleMark hm; |
6008 | 3393 VerifyRegionClosure blk(true, _vo); |
4728
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3394 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
4095
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|
3395 _g1h->workers()->active_workers(), |
390 | 3396 HeapRegion::ParVerifyClaimValue); |
1020
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|
3397 if (blk.failures()) { |
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|
3398 _failures = true; |
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|
3399 } |
390 | 3400 } |
3401 }; | |
3402 | |
12080 | 3403 void G1CollectedHeap::verify(bool silent, VerifyOption vo) { |
8855
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8010463: G1: Crashes with -UseTLAB and heap verification
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|
3404 if (SafepointSynchronize::is_at_safepoint()) { |
12080 | 3405 assert(Thread::current()->is_VM_thread(), |
3406 "Expected to be executed serially by the VM thread at this point"); | |
3407 | |
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|
3408 if (!silent) { gclog_or_tty->print("Roots "); } |
3772
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|
3409 VerifyRootsClosure rootsCl(vo); |
12080 | 3410 G1VerifyCodeRootOopClosure codeRootsCl(this, &rootsCl, vo); |
3411 G1VerifyCodeRootBlobClosure blobsCl(&codeRootsCl); | |
6725
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|
3412 VerifyKlassClosure klassCl(this, &rootsCl); |
3772
6747fd0512e0
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|
3413 |
3293
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
changeset
|
3414 // We apply the relevant closures to all the oops in the |
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
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|
3415 // 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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|
3416 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
3772
6747fd0512e0
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|
3417 |
6725
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6964458: Reimplement class meta-data storage to use native memory
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|
3418 // Need cleared claim bits for the strong roots processing |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3419 ClassLoaderDataGraph::clear_claimed_marks(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3420 |
3293
1f4413413144
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diff
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|
3421 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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|
3422 false, // we set "is scavenging" to false, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3423 // so we don't reset the dirty cards. |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
3424 ScanningOption(so), // roots scanning options |
342 | 3425 &rootsCl, |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
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diff
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|
3426 &blobsCl, |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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diff
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|
3427 &klassCl |
da91efe96a93
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|
3428 ); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3429 |
12080 | 3430 bool failures = rootsCl.failures() || codeRootsCl.failures(); |
3772
6747fd0512e0
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|
3431 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3432 if (vo != VerifyOption_G1UseMarkWord) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
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diff
changeset
|
3433 // If we're verifying during a full GC then the region sets |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
3434 // will have been torn down at the start of the GC. Therefore |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
3435 // verifying the region sets will fail. So we only verify |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3436 // the region sets when not in a full GC. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
3437 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3438 verify_region_sets(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3439 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3440 |
2152 | 3441 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3442 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3443 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3444 "sanity check"); | |
3445 | |
6008 | 3446 G1ParVerifyTask task(this, vo); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
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|
3447 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
3448 workers()->active_workers() == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
3449 "If not dynamic should be using all the workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
3450 int n_workers = workers()->active_workers(); |
390 | 3451 set_par_threads(n_workers); |
3452 workers()->run_task(&task); | |
3453 set_par_threads(0); | |
1020
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6882730: G1: parallel heap verification messes up region dump
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1019
diff
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|
3454 if (task.failures()) { |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3455 failures = true; |
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6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3456 } |
390 | 3457 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
3458 // Checks that the expected amount of parallel work was done. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
3459 // The implication is that n_workers is > 0. |
390 | 3460 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3461 "sanity check"); | |
3462 | |
3463 reset_heap_region_claim_values(); | |
3464 | |
3465 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3466 "sanity check"); | |
3467 } else { | |
6008 | 3468 VerifyRegionClosure blk(false, vo); |
3766 | 3469 heap_region_iterate(&blk); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3470 if (blk.failures()) { |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3471 failures = true; |
ff2402f6a50b
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parents:
1019
diff
changeset
|
3472 } |
390 | 3473 } |
2152 | 3474 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3475 rem_set()->verify(); |
1020
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6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3476 |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3477 if (failures) { |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3478 gclog_or_tty->print_cr("Heap:"); |
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3479 // It helps to have the per-region information in the output to |
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3480 // help us track down what went wrong. This is why we call |
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3481 // print_extended_on() instead of print_on(). |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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parents:
4072
diff
changeset
|
3482 print_extended_on(gclog_or_tty); |
1020
ff2402f6a50b
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diff
changeset
|
3483 gclog_or_tty->print_cr(""); |
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
jcoomes
parents:
1545
diff
changeset
|
3484 #ifndef PRODUCT |
1044 | 3485 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3486 concurrent_mark()->print_reachable("at-verification-failure", |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
3487 vo, false /* all */); |
1020
ff2402f6a50b
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1019
diff
changeset
|
3488 } |
1547
fb1a39993f69
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1545
diff
changeset
|
3489 #endif |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3490 gclog_or_tty->flush(); |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3491 } |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3492 guarantee(!failures, "there should not have been any failures"); |
342 | 3493 } else { |
8855
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
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8853
diff
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|
3494 if (!silent) |
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8853
diff
changeset
|
3495 gclog_or_tty->print("(SKIPPING roots, heapRegionSets, heapRegions, remset) "); |
342 | 3496 } |
3497 } | |
3498 | |
12080 | 3499 void G1CollectedHeap::verify(bool silent) { |
3500 verify(silent, VerifyOption_G1UsePrevMarking); | |
3501 } | |
3502 | |
3503 double G1CollectedHeap::verify(bool guard, const char* msg) { | |
3504 double verify_time_ms = 0.0; | |
3505 | |
3506 if (guard && total_collections() >= VerifyGCStartAt) { | |
3507 double verify_start = os::elapsedTime(); | |
3508 HandleMark hm; // Discard invalid handles created during verification | |
3509 prepare_for_verify(); | |
3510 Universe::verify(VerifyOption_G1UsePrevMarking, msg); | |
3511 verify_time_ms = (os::elapsedTime() - verify_start) * 1000; | |
3512 } | |
3513 | |
3514 return verify_time_ms; | |
3515 } | |
3516 | |
3517 void G1CollectedHeap::verify_before_gc() { | |
3518 double verify_time_ms = verify(VerifyBeforeGC, " VerifyBeforeGC:"); | |
3519 g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms); | |
3520 } | |
3521 | |
3522 void G1CollectedHeap::verify_after_gc() { | |
3523 double verify_time_ms = verify(VerifyAfterGC, " VerifyAfterGC:"); | |
3524 g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms); | |
3525 } | |
3526 | |
342 | 3527 class PrintRegionClosure: public HeapRegionClosure { |
3528 outputStream* _st; | |
3529 public: | |
3530 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3531 bool doHeapRegion(HeapRegion* r) { | |
3532 r->print_on(_st); | |
3533 return false; | |
3534 } | |
3535 }; | |
3536 | |
3537 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3538 st->print(" %-20s", "garbage-first heap"); |
0316eac49d5a
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diff
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|
3539 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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845
diff
changeset
|
3540 capacity()/K, used_unlocked()/K); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3541 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3542 _g1_storage.low_boundary(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3543 _g1_storage.high(), |
0316eac49d5a
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diff
changeset
|
3544 _g1_storage.high_boundary()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3545 st->cr(); |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3546 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
|
3547 uint young_regions = _young_list->length(); |
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3548 st->print("%u young (" SIZE_FORMAT "K), ", young_regions, |
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3549 (size_t) young_regions * HeapRegion::GrainBytes / K); |
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3550 uint survivor_regions = g1_policy()->recorded_survivor_regions(); |
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3551 st->print("%u survivors (" SIZE_FORMAT "K)", survivor_regions, |
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3552 (size_t) survivor_regions * HeapRegion::GrainBytes / K); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3553 st->cr(); |
6863
04155d9c8c76
8000358: G1: metaspace information not printed in PrintHeapAtGC output nor in hs_err file
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|
3554 MetaspaceAux::print_on(st); |
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3555 } |
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|
3556 |
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3557 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3558 print_on(st); |
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|
3559 |
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|
3560 // Print the per-region information. |
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|
3561 st->cr(); |
6010
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|
3562 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), " |
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3563 "HS=humongous(starts), HC=humongous(continues), " |
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3564 "CS=collection set, F=free, TS=gc time stamp, " |
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|
3565 "PTAMS=previous top-at-mark-start, " |
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|
3566 "NTAMS=next top-at-mark-start)"); |
342 | 3567 PrintRegionClosure blk(st); |
3766 | 3568 heap_region_iterate(&blk); |
342 | 3569 } |
3570 | |
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|
3571 void G1CollectedHeap::print_on_error(outputStream* st) const { |
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|
3572 this->CollectedHeap::print_on_error(st); |
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|
3573 |
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|
3574 if (_cm != NULL) { |
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|
3575 st->cr(); |
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|
3576 _cm->print_on_error(st); |
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|
3577 } |
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|
3578 } |
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3579 |
342 | 3580 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { |
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6984287: Regularize how GC parallel workers are specified.
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|
3581 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3582 workers()->print_worker_threads_on(st); |
3583 } | |
3584 _cmThread->print_on(st); | |
342 | 3585 st->cr(); |
1019 | 3586 _cm->print_worker_threads_on(st); |
3587 _cg1r->print_worker_threads_on(st); | |
342 | 3588 } |
3589 | |
3590 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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|
3591 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3592 workers()->threads_do(tc); |
3593 } | |
3594 tc->do_thread(_cmThread); | |
794 | 3595 _cg1r->threads_do(tc); |
342 | 3596 } |
3597 | |
3598 void G1CollectedHeap::print_tracing_info() const { | |
3599 // We'll overload this to mean "trace GC pause statistics." | |
3600 if (TraceGen0Time || TraceGen1Time) { | |
3601 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3602 // to that. | |
3603 g1_policy()->print_tracing_info(); | |
3604 } | |
751 | 3605 if (G1SummarizeRSetStats) { |
342 | 3606 g1_rem_set()->print_summary_info(); |
3607 } | |
1282 | 3608 if (G1SummarizeConcMark) { |
342 | 3609 concurrent_mark()->print_summary_info(); |
3610 } | |
3611 g1_policy()->print_yg_surv_rate_info(); | |
3612 SpecializationStats::print(); | |
3613 } | |
3614 | |
3777
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|
3615 #ifndef PRODUCT |
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|
3616 // Helpful for debugging RSet issues. |
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|
3617 |
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3618 class PrintRSetsClosure : public HeapRegionClosure { |
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|
3619 private: |
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|
3620 const char* _msg; |
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|
3621 size_t _occupied_sum; |
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|
3622 |
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|
3623 public: |
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3624 bool doHeapRegion(HeapRegion* r) { |
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3625 HeapRegionRemSet* hrrs = r->rem_set(); |
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|
3626 size_t occupied = hrrs->occupied(); |
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|
3627 _occupied_sum += occupied; |
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|
3628 |
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|
3629 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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|
3630 HR_FORMAT_PARAMS(r)); |
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|
3631 if (occupied == 0) { |
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|
3632 gclog_or_tty->print_cr(" RSet is empty"); |
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|
3633 } else { |
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|
3634 hrrs->print(); |
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|
3635 } |
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changeset
|
3636 gclog_or_tty->print_cr("----------"); |
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|
3637 return false; |
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parents:
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changeset
|
3638 } |
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changeset
|
3639 |
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changeset
|
3640 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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|
3641 gclog_or_tty->cr(); |
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|
3642 gclog_or_tty->print_cr("========================================"); |
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|
3643 gclog_or_tty->print_cr(msg); |
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diff
changeset
|
3644 gclog_or_tty->cr(); |
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tonyp
parents:
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changeset
|
3645 } |
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tonyp
parents:
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diff
changeset
|
3646 |
e8b0b0392037
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diff
changeset
|
3647 ~PrintRSetsClosure() { |
e8b0b0392037
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changeset
|
3648 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
e8b0b0392037
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changeset
|
3649 gclog_or_tty->print_cr("========================================"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
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diff
changeset
|
3650 gclog_or_tty->cr(); |
e8b0b0392037
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tonyp
parents:
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diff
changeset
|
3651 } |
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parents:
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diff
changeset
|
3652 }; |
e8b0b0392037
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tonyp
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diff
changeset
|
3653 |
e8b0b0392037
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diff
changeset
|
3654 void G1CollectedHeap::print_cset_rsets() { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
changeset
|
3655 PrintRSetsClosure cl("Printing CSet RSets"); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3656 collection_set_iterate(&cl); |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3657 } |
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tonyp
parents:
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diff
changeset
|
3658 |
e8b0b0392037
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diff
changeset
|
3659 void G1CollectedHeap::print_all_rsets() { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3660 PrintRSetsClosure cl("Printing All RSets");; |
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parents:
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diff
changeset
|
3661 heap_region_iterate(&cl); |
e8b0b0392037
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parents:
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diff
changeset
|
3662 } |
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diff
changeset
|
3663 #endif // PRODUCT |
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|
3664 |
342 | 3665 G1CollectedHeap* G1CollectedHeap::heap() { |
3666 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3667 "not a garbage-first heap"); | |
3668 return _g1h; | |
3669 } | |
3670 | |
3671 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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parents:
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diff
changeset
|
3672 // always_do_update_barrier = false; |
342 | 3673 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3674 // Fill TLAB's and such | |
3675 ensure_parsability(true); | |
3676 } | |
3677 | |
3678 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
10372
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
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10327
diff
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|
3679 |
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changeset
|
3680 if (G1SummarizeRSetStats && |
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8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
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diff
changeset
|
3681 (G1SummarizeRSetStatsPeriod > 0) && |
e72f7eecc96d
8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
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10327
diff
changeset
|
3682 // we are at the end of the GC. Total collections has already been increased. |
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8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
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diff
changeset
|
3683 ((total_collections() - 1) % G1SummarizeRSetStatsPeriod == 0)) { |
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tschatzl
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10327
diff
changeset
|
3684 g1_rem_set()->print_periodic_summary_info(); |
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tschatzl
parents:
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diff
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|
3685 } |
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diff
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|
3686 |
342 | 3687 // FIXME: what is this about? |
3688 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3689 // is set. | |
3690 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3691 "derived pointer present")); | |
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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changeset
|
3692 // always_do_update_barrier = true; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 // We have just completed a GC. Update the soft reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
3695 // policy with the new heap occupancy |
4dfb2df418f2
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changeset
|
3696 Universe::update_heap_info_at_gc(); |
342 | 3697 } |
3698 | |
1973 | 3699 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3700 unsigned int gc_count_before, | |
3701 bool* succeeded) { | |
3702 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3703 g1_policy()->record_stop_world_start(); |
1973 | 3704 VM_G1IncCollectionPause op(gc_count_before, |
3705 word_size, | |
3706 false, /* should_initiate_conc_mark */ | |
3707 g1_policy()->max_pause_time_ms(), | |
3708 GCCause::_g1_inc_collection_pause); | |
3709 VMThread::execute(&op); | |
3710 | |
3711 HeapWord* result = op.result(); | |
3712 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3713 assert(result == NULL || ret_succeeded, | |
3714 "the result should be NULL if the VM did not succeed"); | |
3715 *succeeded = ret_succeeded; | |
3716 | |
3717 assert_heap_not_locked(); | |
3718 return result; | |
342 | 3719 } |
3720 | |
3721 void | |
3722 G1CollectedHeap::doConcurrentMark() { | |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
3723 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
3724 if (!_cmThread->in_progress()) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
3725 _cmThread->set_started(); |
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changeset
|
3726 CGC_lock->notify(); |
342 | 3727 } |
3728 } | |
3729 | |
3730 size_t G1CollectedHeap::pending_card_num() { | |
3731 size_t extra_cards = 0; | |
3732 JavaThread *curr = Threads::first(); | |
3733 while (curr != NULL) { | |
3734 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3735 extra_cards += dcq.size(); | |
3736 curr = curr->next(); | |
3737 } | |
3738 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3739 size_t buffer_size = dcqs.buffer_size(); | |
3740 size_t buffer_num = dcqs.completed_buffers_num(); | |
6611 | 3741 |
3742 // PtrQueueSet::buffer_size() and PtrQueue:size() return sizes | |
3743 // in bytes - not the number of 'entries'. We need to convert | |
3744 // into a number of cards. | |
3745 return (buffer_size * buffer_num + extra_cards) / oopSize; | |
342 | 3746 } |
3747 | |
3748 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3749 return g1_rem_set()->cardsScanned(); |
342 | 3750 } |
3751 | |
3752 void | |
3753 G1CollectedHeap::setup_surviving_young_words() { | |
6010
720b6a76dd9d
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changeset
|
3754 assert(_surviving_young_words == NULL, "pre-condition"); |
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changeset
|
3755 uint array_length = g1_policy()->young_cset_region_length(); |
6197 | 3756 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, (size_t) array_length, mtGC); |
342 | 3757 if (_surviving_young_words == NULL) { |
10161
746b070f5022
8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
ccheung
parents:
10099
diff
changeset
|
3758 vm_exit_out_of_memory(sizeof(size_t) * array_length, OOM_MALLOC_ERROR, |
342 | 3759 "Not enough space for young surv words summary."); |
3760 } | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3761 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
|
3762 #ifdef ASSERT |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3763 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
|
3764 assert( _surviving_young_words[i] == 0, "memset above" ); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3765 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3766 #endif // !ASSERT |
342 | 3767 } |
3768 | |
3769 void | |
3770 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3771 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
|
3772 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
|
3773 for (uint i = 0; i < array_length; ++i) { |
342 | 3774 _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
|
3775 } |
342 | 3776 } |
3777 | |
3778 void | |
3779 G1CollectedHeap::cleanup_surviving_young_words() { | |
3780 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
6197 | 3781 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words, mtGC); |
342 | 3782 _surviving_young_words = NULL; |
3783 } | |
3784 | |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3785 #ifdef ASSERT |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3786 class VerifyCSetClosure: public HeapRegionClosure { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3787 public: |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3788 bool doHeapRegion(HeapRegion* hr) { |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3789 // 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
|
3790 // 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
|
3791 // 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
|
3792 // 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
|
3793 // 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
|
3794 // 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
|
3795 // 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
|
3796 // 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
|
3797 // evacuation failure handling. |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3798 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
|
3799 |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3800 // 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
|
3801 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3802 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3803 } |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3804 }; |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3805 #endif // ASSERT |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3806 |
1709 | 3807 #if TASKQUEUE_STATS |
3808 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3809 st->print_raw_cr("GC Task Stats"); | |
3810 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3811 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3812 } | |
3813 | |
3814 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3815 print_taskqueue_stats_hdr(st); | |
3816 | |
3817 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3818 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3819 for (int i = 0; i < n; ++i) { |
3820 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3821 totals += task_queue(i)->stats; | |
3822 } | |
3823 st->print_raw("tot "); totals.print(st); st->cr(); | |
3824 | |
3825 DEBUG_ONLY(totals.verify()); | |
3826 } | |
3827 | |
3828 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3829 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3830 for (int i = 0; i < n; ++i) { |
3831 task_queue(i)->stats.reset(); | |
3832 } | |
3833 } | |
3834 #endif // TASKQUEUE_STATS | |
3835 | |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3836 void G1CollectedHeap::log_gc_header() { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3837 if (!G1Log::fine()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3838 return; |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3839 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3840 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3841 gclog_or_tty->date_stamp(PrintGCDateStamps); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3842 gclog_or_tty->stamp(PrintGCTimeStamps); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3843 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3844 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
|
3845 .append(g1_policy()->gcs_are_young() ? "(young)" : "(mixed)") |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3846 .append(g1_policy()->during_initial_mark_pause() ? " (initial-mark)" : ""); |
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->print("[%s", (const char*)gc_cause_str); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3849 } |
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 void G1CollectedHeap::log_gc_footer(double pause_time_sec) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3852 if (!G1Log::fine()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3853 return; |
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 |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3856 if (G1Log::finer()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3857 if (evacuation_failed()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3858 gclog_or_tty->print(" (to-space exhausted)"); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3859 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3860 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
|
3861 g1_policy()->phase_times()->note_gc_end(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3862 g1_policy()->phase_times()->print(pause_time_sec); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3863 g1_policy()->print_detailed_heap_transition(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3864 } else { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3865 if (evacuation_failed()) { |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3866 gclog_or_tty->print("--"); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3867 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3868 g1_policy()->print_heap_transition(); |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3869 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
|
3870 } |
7207
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
3871 gclog_or_tty->flush(); |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3872 } |
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3873 |
1973 | 3874 bool |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3875 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3876 assert_at_safepoint(true /* should_be_vm_thread */); |
3877 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3878 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3879 if (GC_locker::check_active_before_gc()) { |
1973 | 3880 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3881 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3882 |
10405 | 3883 _gc_timer_stw->register_gc_start(os::elapsed_counter()); |
3884 | |
3885 _gc_tracer_stw->report_gc_start(gc_cause(), _gc_timer_stw->gc_start()); | |
3886 | |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3887 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3888 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3889 |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3890 print_heap_before_gc(); |
10405 | 3891 trace_heap_before_gc(_gc_tracer_stw); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3892 |
4072 | 3893 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3894 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3895 verify_dirty_young_regions(); |
2152 | 3896 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3897 // 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
|
3898 // 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
|
3899 // for the duration of this pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3900 g1_policy()->decide_on_conc_mark_initiation(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3901 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3902 // 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
|
3903 assert(!g1_policy()->during_initial_mark_pause() || |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3904 g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3905 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3906 // 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
|
3907 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
|
3908 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3909 // 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
|
3910 // 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
|
3911 // 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
|
3912 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
|
3913 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3914 // 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
|
3915 { |
10405 | 3916 EvacuationInfo evacuation_info; |
3917 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3918 if (g1_policy()->during_initial_mark_pause()) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3919 // 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
|
3920 // full collection counter. |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
3921 increment_old_marking_cycles_started(); |
10405 | 3922 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
|
3923 } |
10405 | 3924 |
3925 _gc_tracer_stw->report_yc_type(yc_type()); | |
3926 | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3927 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
6030 | 3928 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3929 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
|
3930 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
|
3931 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
|
3932 g1_policy()->phase_times()->note_gc_start(active_workers); |
6752
9646b7ff4d14
7198130: G1: PrintReferenceGC output comes out of order
brutisso
parents:
6725
diff
changeset
|
3933 log_gc_header(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3934 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3935 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3936 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3937 |
2361 | 3938 // If the secondary_free_list is not empty, append it to the |
3939 // free_list. No need to wait for the cleanup operation to finish; | |
3940 // the region allocation code will check the secondary_free_list | |
3941 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3942 // set, skip this step so that the region allocation code has to | |
3943 // get entries from the secondary_free_list. | |
2152 | 3944 if (!G1StressConcRegionFreeing) { |
2361 | 3945 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3946 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3947 |
12080 | 3948 assert(check_young_list_well_formed(), "young list should be well formed"); |
3949 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3950 "sanity check"); | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3951 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3952 // 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
|
3953 // 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
|
3954 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3955 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3956 { // 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
|
3957 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3958 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3959 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3960 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
|
3961 increment_gc_time_stamp(); |
342 | 3962 |
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
|
3963 verify_before_gc(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3964 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3965 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3966 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3967 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3968 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3969 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3970 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3971 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3972 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3973 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3974 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3975 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3976 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3977 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3978 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3979 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3980 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
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 // 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
|
3983 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3984 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3985 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3986 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3987 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3988 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3989 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3990 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3991 // 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
|
3992 // 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
|
3993 // 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
|
3994 // |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3995 // 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
|
3996 // |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3997 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3998 // 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
|
3999 double sample_start_time_sec = os::elapsedTime(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4000 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4001 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4002 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4003 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4004 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
|
4005 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4006 |
10098
71013d764f6e
8010780: G1: Eden occupancy/capacity output wrong after a full GC
johnc
parents:
8855
diff
changeset
|
4007 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
|
4008 |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4009 double scan_wait_start = os::elapsedTime(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4010 // 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
|
4011 // 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
|
4012 // 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
|
4013 // moving them during the GC. |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4014 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
|
4015 double wait_time_ms = 0.0; |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4016 if (waited) { |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4017 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
|
4018 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
|
4019 } |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4020 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
|
4021 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4022 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4023 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4024 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4025 #endif // YOUNG_LIST_VERBOSE |
342 | 4026 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4027 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4028 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4029 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4030 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4031 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4032 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4033 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4034 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
|
4035 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4036 |
10405 | 4037 g1_policy()->finalize_cset(target_pause_time_ms, evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4038 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4039 _cm->note_start_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4040 // 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
|
4041 // 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
|
4042 // 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
|
4043 // ensure that the CSet has been finalized. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4044 _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
|
4045 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4046 false /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4047 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4048 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4049 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4050 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4051 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4052 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4053 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4054 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4055 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4056 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4057 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4058 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4059 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4060 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4061 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4062 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4063 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4064 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
4065 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4066 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4067 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
4068 #endif // ASSERT |
1707 | 4069 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4070 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4071 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4072 // Initialize the GC alloc regions. |
10405 | 4073 init_gc_alloc_regions(evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4074 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4075 // Actually do the work... |
10405 | 4076 evacuate_collection_set(evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4077 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4078 // 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
|
4079 // (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
|
4080 // 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
|
4081 // 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
|
4082 // we checked. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4083 _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
|
4084 false /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4085 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4086 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4087 |
10405 | 4088 free_collection_set(g1_policy()->collection_set(), evacuation_info); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4089 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4090 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4091 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4092 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4093 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4094 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4095 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4096 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4097 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4098 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4099 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4100 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4101 _young_list->reset_sampled_info(); |
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 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4104 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4105 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4106 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4107 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4108 "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
|
4109 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4110 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4111 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4112 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4113 #endif // YOUNG_LIST_VERBOSE |
342 | 4114 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4115 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
10405 | 4116 _young_list->first_survivor_region(), |
4117 _young_list->last_survivor_region()); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4118 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4119 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4120 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4121 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4122 _summary_bytes_used = recalculate_used(); |
10405 | 4123 uint n_queues = MAX2((int)ParallelGCThreads, 1); |
4124 for (uint i = 0; i < n_queues; i++) { | |
4125 if (_evacuation_failed_info_array[i].has_failed()) { | |
4126 _gc_tracer_stw->report_evacuation_failed(_evacuation_failed_info_array[i]); | |
4127 } | |
4128 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4129 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4130 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4131 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4132 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4133 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4134 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4135 if (g1_policy()->during_initial_mark_pause()) { |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
4136 // 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
|
4137 // 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
|
4138 // appropriate initialization is done on the CM object. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4139 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4140 set_marking_started(); |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4141 // 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
|
4142 // 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
|
4143 // the current thread has completed its logging output. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4144 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4145 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4146 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
4147 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4148 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4149 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4150 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4151 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
|
4152 #endif // YOUNG_LIST_VERBOSE |
342 | 4153 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4154 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4155 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4156 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4157 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4158 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4159 size_t bytes_before = capacity(); |
4785 | 4160 // No need for an ergo verbose message here, |
4161 // expansion_amount() does this when it returns a value > 0. | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4162 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4163 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4164 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4165 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4166 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4167 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4168 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4169 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4170 |
10405 | 4171 // 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
|
4172 // 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
|
4173 _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
|
4174 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4175 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4176 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4177 _cm->note_end_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4178 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4179 // 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
|
4180 // 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
|
4181 // 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
|
4182 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
|
4183 double pause_time_ms = (sample_end_time_sec - sample_start_time_sec) * MILLIUNITS; |
10405 | 4184 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
|
4185 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4186 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4187 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4188 // 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
|
4189 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4190 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4191 // 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
|
4192 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4193 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4194 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4195 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4196 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4197 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4198 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4199 // 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
|
4200 // 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
|
4201 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4202 // 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
|
4203 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4204 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4205 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4206 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4207 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4208 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4209 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4210 |
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
|
4211 verify_after_gc(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4212 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4213 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4214 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4215 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4216 // 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
|
4217 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
4218 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4219 // 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
|
4220 // 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
|
4221 // 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
|
4222 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4223 _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
|
4224 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4225 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4226 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4227 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4228 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4229 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4230 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
4231 #endif |
342 | 4232 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4233 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
4234 } |
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4235 |
7207
0f80645e9c26
8004170: G1: Verbose GC output is not getting flushed to log file using JDK 8
johnc
parents:
6863
diff
changeset
|
4236 // 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
|
4237 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
|
4238 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4239 // 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
|
4240 // 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
|
4241 // 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
|
4242 // logging output either. |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4243 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4244 _hrs.verify_optional(); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4245 verify_region_sets_optional(); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4246 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4247 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
|
4248 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4249 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4250 print_heap_after_gc(); |
10405 | 4251 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
|
4252 |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4253 // 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
|
4254 // 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
|
4255 // 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
|
4256 // before any GC notifications are raised. |
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
4257 g1mm()->update_sizes(); |
10405 | 4258 |
4259 _gc_tracer_stw->report_evacuation_info(&evacuation_info); | |
4260 _gc_tracer_stw->report_tenuring_threshold(_g1_policy->tenuring_threshold()); | |
4261 _gc_timer_stw->register_gc_end(os::elapsed_counter()); | |
4262 _gc_tracer_stw->report_gc_end(_gc_timer_stw->gc_end(), _gc_timer_stw->time_partitions()); | |
4263 } | |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4264 // 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
|
4265 // 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
|
4266 // that came from the pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4267 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4268 if (should_start_conc_mark) { |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4269 // CAUTION: after the doConcurrentMark() call below, |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4270 // the concurrent marking thread(s) could be running |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4271 // concurrently with us. Make sure that anything after |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4272 // 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
|
4273 // 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
|
4274 // 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
|
4275 // ConcurrentGCThread::safepoint_desynchronize(). |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4276 doConcurrentMark(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4277 } |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4278 |
1973 | 4279 return true; |
342 | 4280 } |
4281 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4282 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4283 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4284 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4285 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4286 case GCAllocForSurvived: |
6595 | 4287 gclab_word_size = _survivor_plab_stats.desired_plab_sz(); |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4288 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4289 case GCAllocForTenured: |
6595 | 4290 gclab_word_size = _old_plab_stats.desired_plab_sz(); |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4291 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4292 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4293 assert(false, "unknown GCAllocPurpose"); |
6595 | 4294 gclab_word_size = _old_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 } |
6595 | 4297 |
4298 // Prevent humongous PLAB sizes for two reasons: | |
4299 // * PLABs are allocated using a similar paths as oops, but should | |
4300 // never be in a humongous region | |
4301 // * Allowing humongous PLABs needlessly churns the region free lists | |
4302 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
|
4303 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4304 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4305 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4306 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4307 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4308 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4309 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4310 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4311 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4312 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4313 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4314 |
10405 | 4315 void G1CollectedHeap::init_gc_alloc_regions(EvacuationInfo& evacuation_info) { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4316 assert_at_safepoint(true /* should_be_vm_thread */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4317 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4318 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4319 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4320 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4321 _retained_old_gc_alloc_region = NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4322 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4323 // We will discard the current GC alloc region if: |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4324 // a) it's in the collection set (it can happen!), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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4325 // b) it's already full (no point in using it), |
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4326 // c) it's empty (this means that it was emptied during |
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4327 // a cleanup and it should be on the free list now), or |
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4328 // d) it's humongous (this means that it was emptied |
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4329 // during a cleanup and was added to the free list, but |
10405 | 4330 // has been subsequently used to allocate a humongous |
3830
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4331 // object that may be less than the region size). |
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4332 if (retained_region != NULL && |
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4333 !retained_region->in_collection_set() && |
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4334 !(retained_region->top() == retained_region->end()) && |
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4335 !retained_region->is_empty() && |
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4336 !retained_region->isHumongous()) { |
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4337 retained_region->set_saved_mark(); |
4072 | 4338 // The retained region was added to the old region set when it was |
4339 // retired. We have to remove it now, since we don't allow regions | |
4340 // we allocate to in the region sets. We'll re-add it later, when | |
4341 // it's retired again. | |
4342 _old_set.remove(retained_region); | |
4787
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4343 bool during_im = g1_policy()->during_initial_mark_pause(); |
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4344 retained_region->note_start_of_copying(during_im); |
3830
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4345 _old_gc_alloc_region.set(retained_region); |
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4346 _hr_printer.reuse(retained_region); |
10405 | 4347 evacuation_info.set_alloc_regions_used_before(retained_region->used()); |
4348 } | |
4349 } | |
4350 | |
4351 void G1CollectedHeap::release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) { | |
4352 evacuation_info.set_allocation_regions(_survivor_gc_alloc_region.count() + | |
4353 _old_gc_alloc_region.count()); | |
3830
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4354 _survivor_gc_alloc_region.release(); |
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4355 // If we have an old GC alloc region to release, we'll save it in |
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4356 // _retained_old_gc_alloc_region. If we don't |
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4357 // _retained_old_gc_alloc_region will become NULL. This is what we |
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4358 // want either way so no reason to check explicitly for either |
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4359 // condition. |
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4360 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
6595 | 4361 |
4362 if (ResizePLAB) { | |
6819 | 4363 _survivor_plab_stats.adjust_desired_plab_sz(no_of_gc_workers); |
4364 _old_plab_stats.adjust_desired_plab_sz(no_of_gc_workers); | |
6595 | 4365 } |
342 | 4366 } |
4367 | |
3830
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4368 void G1CollectedHeap::abandon_gc_alloc_regions() { |
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4369 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
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4370 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
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4371 _retained_old_gc_alloc_region = NULL; |
342 | 4372 } |
4373 | |
4374 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
4375 _drain_in_progress = false; | |
4376 set_evac_failure_closure(cl); | |
6197 | 4377 _evac_failure_scan_stack = new (ResourceObj::C_HEAP, mtGC) GrowableArray<oop>(40, true); |
342 | 4378 } |
4379 | |
4380 void G1CollectedHeap::finalize_for_evac_failure() { | |
4381 assert(_evac_failure_scan_stack != NULL && | |
4382 _evac_failure_scan_stack->length() == 0, | |
4383 "Postcondition"); | |
4384 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 4385 delete _evac_failure_scan_stack; |
342 | 4386 _evac_failure_scan_stack = NULL; |
4387 } | |
4388 | |
4389 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
4783
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4390 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
023652e49ac0
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4391 |
023652e49ac0
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4392 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
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4393 |
023652e49ac0
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4394 if (G1CollectedHeap::use_parallel_gc_threads()) { |
023652e49ac0
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4395 set_par_threads(); |
023652e49ac0
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4396 workers()->run_task(&rsfp_task); |
023652e49ac0
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4397 set_par_threads(0); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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4398 } else { |
4783
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4399 rsfp_task.work(0); |
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4400 } |
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|
4401 |
023652e49ac0
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4402 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
023652e49ac0
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4403 |
023652e49ac0
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4404 // Reset the claim values in the regions in the collection set. |
023652e49ac0
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4405 reset_cset_heap_region_claim_values(); |
023652e49ac0
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|
4406 |
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|
4407 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
342 | 4408 |
4409 // Now restore saved marks, if any. | |
8038
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4410 assert(_objs_with_preserved_marks.size() == |
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4411 _preserved_marks_of_objs.size(), "Both or none."); |
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4412 while (!_objs_with_preserved_marks.is_empty()) { |
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4413 oop obj = _objs_with_preserved_marks.pop(); |
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4414 markOop m = _preserved_marks_of_objs.pop(); |
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4415 obj->set_mark(m); |
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4416 } |
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4417 _objs_with_preserved_marks.clear(true); |
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4418 _preserved_marks_of_objs.clear(true); |
342 | 4419 } |
4420 | |
4421 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4422 _evac_failure_scan_stack->push(obj); | |
4423 } | |
4424 | |
4425 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4426 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4427 | |
4428 while (_evac_failure_scan_stack->length() > 0) { | |
4429 oop obj = _evac_failure_scan_stack->pop(); | |
4430 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4431 obj->oop_iterate_backwards(_evac_failure_closure); | |
4432 } | |
4433 } | |
4434 | |
4435 oop | |
10405 | 4436 G1CollectedHeap::handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4437 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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|
4438 assert(obj_in_cs(old), |
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7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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|
4439 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
75af3e8de182
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|
4440 (HeapWord*) old)); |
342 | 4441 markOop m = old->mark(); |
4442 oop forward_ptr = old->forward_to_atomic(old); | |
4443 if (forward_ptr == NULL) { | |
4444 // Forward-to-self succeeded. | |
10405 | 4445 assert(_par_scan_state != NULL, "par scan state"); |
4446 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4447 uint queue_num = _par_scan_state->queue_num(); | |
4448 | |
4449 _evacuation_failed = true; | |
4450 _evacuation_failed_info_array[queue_num].register_copy_failure(old->size()); | |
342 | 4451 if (_evac_failure_closure != cl) { |
4452 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4453 assert(!_drain_in_progress, | |
4454 "Should only be true while someone holds the lock."); | |
4455 // Set the global evac-failure closure to the current thread's. | |
4456 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4457 set_evac_failure_closure(cl); | |
4458 // Now do the common part. | |
4459 handle_evacuation_failure_common(old, m); | |
4460 // Reset to NULL. | |
4461 set_evac_failure_closure(NULL); | |
4462 } else { | |
4463 // The lock is already held, and this is recursive. | |
4464 assert(_drain_in_progress, "This should only be the recursive case."); | |
4465 handle_evacuation_failure_common(old, m); | |
4466 } | |
4467 return old; | |
4468 } else { | |
3323
75af3e8de182
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|
4469 // Forward-to-self failed. Either someone else managed to allocate |
75af3e8de182
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|
4470 // space for this object (old != forward_ptr) or they beat us in |
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|
4471 // self-forwarding it (old == forward_ptr). |
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|
4472 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
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|
4473 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
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|
4474 "should not be in the CSet", |
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|
4475 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4476 return forward_ptr; |
4477 } | |
4478 } | |
4479 | |
4480 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4481 preserve_mark_if_necessary(old, m); | |
4482 | |
4483 HeapRegion* r = heap_region_containing(old); | |
4484 if (!r->evacuation_failed()) { | |
4485 r->set_evacuation_failed(true); | |
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5f6f2615433a
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|
4486 _hr_printer.evac_failure(r); |
342 | 4487 } |
4488 | |
4489 push_on_evac_failure_scan_stack(old); | |
4490 | |
4491 if (!_drain_in_progress) { | |
4492 // prevent recursion in copy_to_survivor_space() | |
4493 _drain_in_progress = true; | |
4494 drain_evac_failure_scan_stack(); | |
4495 _drain_in_progress = false; | |
4496 } | |
4497 } | |
4498 | |
4499 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
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|
4500 assert(evacuation_failed(), "Oversaving!"); |
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diff
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|
4501 // We want to call the "for_promotion_failure" version only in the |
74ee0db180fa
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2037
diff
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|
4502 // case of a promotion failure. |
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|
4503 if (m->must_be_preserved_for_promotion_failure(obj)) { |
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|
4504 _objs_with_preserved_marks.push(obj); |
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|
4505 _preserved_marks_of_objs.push(m); |
342 | 4506 } |
4507 } | |
4508 | |
4509 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4510 size_t word_size) { | |
3830
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4511 if (purpose == GCAllocForSurvived) { |
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|
4512 HeapWord* result = survivor_attempt_allocation(word_size); |
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|
4513 if (result != NULL) { |
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|
4514 return result; |
342 | 4515 } else { |
3830
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|
4516 // Let's try to allocate in the old gen in case we can fit the |
f44782f04dd4
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|
4517 // object there. |
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|
4518 return old_attempt_allocation(word_size); |
342 | 4519 } |
3830
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|
4520 } else { |
f44782f04dd4
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|
4521 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
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|
4522 HeapWord* result = old_attempt_allocation(word_size); |
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|
4523 if (result != NULL) { |
f44782f04dd4
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|
4524 return result; |
342 | 4525 } else { |
3830
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changeset
|
4526 // 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
|
4527 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4528 return survivor_attempt_allocation(word_size); |
342 | 4529 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4530 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4531 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4532 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4533 // 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
|
4534 return NULL; |
342 | 4535 } |
4536 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4537 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
|
4538 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4539 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4540 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4541 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4542 _refs(g1h->task_queue(queue_num)), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4543 _dcq(&g1h->dirty_card_queue_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4544 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4545 _g1_rem(g1h->g1_rem_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4546 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4547 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4548 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4549 _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
|
4550 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
4551 _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
|
4552 _alloc_buffer_waste(0), _undo_waste(0) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4553 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4554 // 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
|
4555 // non-young regions (where the age is -1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4556 // 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
|
4557 // an attempt to eliminate cache contention |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4558 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
|
4559 uint array_length = PADDING_ELEM_NUM + |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4560 real_length + |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4561 PADDING_ELEM_NUM; |
6197 | 4562 _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
|
4563 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
|
4564 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
|
4565 "Not enough space for young surv histo."); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4566 _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
|
4567 memset(_surviving_young_words, 0, (size_t) real_length * sizeof(size_t)); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
4568 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4569 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4570 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4571 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4572 _start = os::elapsedTime(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
4573 } |
342 | 4574 |
1709 | 4575 void |
4576 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4577 { | |
4578 st->print_raw_cr("GC Termination Stats"); | |
4579 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4580 " ------waste (KiB)------"); | |
4581 st->print_raw_cr("thr ms ms % ms % attempts" | |
4582 " total alloc undo"); | |
4583 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4584 " ------- ------- -------"); | |
4585 } | |
4586 | |
4587 void | |
4588 G1ParScanThreadState::print_termination_stats(int i, | |
4589 outputStream* const st) const | |
4590 { | |
4591 const double elapsed_ms = elapsed_time() * 1000.0; | |
4592 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4593 const double term_ms = term_time() * 1000.0; | |
4594 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4595 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4596 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4597 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4598 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4599 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4600 alloc_buffer_waste() * HeapWordSize / K, | |
4601 undo_waste() * HeapWordSize / K); | |
4602 } | |
4603 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4604 #ifdef ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4605 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4606 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4607 assert(UseCompressedOops, "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4608 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4609 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4610 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4611 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4612 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4613 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4614 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4615 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4616 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4617 if (has_partial_array_mask(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4618 // Must be in the collection set--it's already been copied. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4619 oop p = clear_partial_array_mask(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4620 assert(_g1h->obj_in_cs(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4621 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4622 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4623 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4624 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4625 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4626 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4627 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4628 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4629 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4630 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4631 if (ref.is_narrow()) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4632 return verify_ref((narrowOop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4633 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4634 return verify_ref((oop*) ref); |
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 #endif // ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4638 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4639 void G1ParScanThreadState::trim_queue() { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4640 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4641 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4642 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4643 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4644 StarTask ref; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4645 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4646 // Drain the overflow stack first, so other threads can steal. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4647 while (refs()->pop_overflow(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4648 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4649 } |
3979
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 while (refs()->pop_local(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4652 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4653 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4654 } while (!refs()->is_empty()); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4655 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4656 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4657 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4658 G1ParScanThreadState* par_scan_state) : |
342 | 4659 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4660 _par_scan_state(par_scan_state), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4661 _worker_id(par_scan_state->queue_num()), |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4662 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4663 _mark_in_progress(_g1->mark_in_progress()) { } |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4664 |
5987 | 4665 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4666 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object>::mark_object(oop obj) { | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4667 #ifdef ASSERT |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4668 HeapRegion* hr = _g1->heap_region_containing(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4669 assert(hr != NULL, "sanity"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4670 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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|
4671 #endif // ASSERT |
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|
4672 |
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|
4673 // We know that the object is not moving so it's safe to read its size. |
4836
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|
4674 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4675 } |
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|
4676 |
5987 | 4677 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4678 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
4679 ::mark_forwarded_object(oop from_obj, oop to_obj) { | |
4787
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|
4680 #ifdef ASSERT |
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|
4681 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
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4682 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
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4683 assert(from_obj != to_obj, "should not be self-forwarded"); |
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|
4684 |
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4685 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
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4686 assert(from_hr != NULL, "sanity"); |
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|
4687 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
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|
4688 |
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|
4689 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
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4690 assert(to_hr != NULL, "sanity"); |
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|
4691 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
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|
4692 #endif // ASSERT |
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|
4693 |
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4694 // The object might be in the process of being copied by another |
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|
4695 // worker so we cannot trust that its to-space image is |
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|
4696 // well-formed. So we have to read its size from its from-space |
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4697 // image which we know should not be changing. |
4836
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4698 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
4787
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|
4699 } |
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|
4700 |
5987 | 4701 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
4702 oop G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
4703 ::copy_to_survivor_space(oop old) { | |
6010
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4704 size_t word_sz = old->size(); |
342 | 4705 HeapRegion* from_region = _g1->heap_region_containing_raw(old); |
4706 // +1 to make the -1 indexes valid... | |
4707 int young_index = from_region->young_index_in_cset()+1; | |
4787
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4708 assert( (from_region->is_young() && young_index > 0) || |
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|
4709 (!from_region->is_young() && young_index == 0), "invariant" ); |
342 | 4710 G1CollectorPolicy* g1p = _g1->g1_policy(); |
4711 markOop m = old->mark(); | |
545 | 4712 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4713 : m->age(); | |
4714 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4715 word_sz); |
4716 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
6629
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|
4717 #ifndef PRODUCT |
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|
4718 // Should this evacuation fail? |
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|
4719 if (_g1->evacuation_should_fail()) { |
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|
4720 if (obj_ptr != NULL) { |
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|
4721 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); |
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|
4722 obj_ptr = NULL; |
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|
4723 } |
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|
4724 } |
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|
4725 #endif // !PRODUCT |
342 | 4726 |
4727 if (obj_ptr == NULL) { | |
4728 // This will either forward-to-self, or detect that someone else has | |
4729 // installed a forwarding pointer. | |
10405 | 4730 return _g1->handle_evacuation_failure_par(_par_scan_state, old); |
342 | 4731 } |
4732 | |
6629
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|
4733 oop obj = oop(obj_ptr); |
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|
4734 |
526 | 4735 // We're going to allocate linearly, so might as well prefetch ahead. |
4736 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4737 | |
342 | 4738 oop forward_ptr = old->forward_to_atomic(obj); |
4739 if (forward_ptr == NULL) { | |
4740 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4741 if (g1p->track_object_age(alloc_purpose)) { |
4742 // We could simply do obj->incr_age(). However, this causes a | |
4743 // performance issue. obj->incr_age() will first check whether | |
4744 // the object has a displaced mark by checking its mark word; | |
4745 // getting the mark word from the new location of the object | |
4746 // stalls. So, given that we already have the mark word and we | |
4747 // are about to install it anyway, it's better to increase the | |
4748 // age on the mark word, when the object does not have a | |
4749 // displaced mark word. We're not expecting many objects to have | |
4750 // a displaced marked word, so that case is not optimized | |
4751 // further (it could be...) and we simply call obj->incr_age(). | |
4752 | |
4753 if (m->has_displaced_mark_helper()) { | |
4754 // in this case, we have to install the mark word first, | |
4755 // otherwise obj looks to be forwarded (the old mark word, | |
4756 // which contains the forward pointer, was copied) | |
4757 obj->set_mark(m); | |
4758 obj->incr_age(); | |
4759 } else { | |
4760 m = m->incr_age(); | |
545 | 4761 obj->set_mark(m); |
526 | 4762 } |
545 | 4763 _par_scan_state->age_table()->add(obj, word_sz); |
4764 } else { | |
4765 obj->set_mark(m); | |
526 | 4766 } |
4767 | |
342 | 4768 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
4769 surv_young_words[young_index] += word_sz; | |
4770 | |
4771 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4784
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|
4772 // We keep track of the next start index in the length field of |
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|
4773 // the to-space object. The actual length can be found in the |
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|
4774 // length field of the from-space object. |
02838862dec8
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|
4775 arrayOop(obj)->set_length(0); |
845
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|
4776 oop* old_p = set_partial_array_mask(old); |
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|
4777 _par_scan_state->push_on_queue(old_p); |
342 | 4778 } else { |
526 | 4779 // No point in using the slower heap_region_containing() method, |
4780 // given that we know obj is in the heap. | |
5987 | 4781 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
4782 obj->oop_iterate_backwards(&_scanner); | |
342 | 4783 } |
4784 } else { | |
4785 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4786 obj = forward_ptr; | |
4787 } | |
4788 return obj; | |
4789 } | |
4790 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4791 template <class T> |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4792 void G1ParCopyHelper::do_klass_barrier(T* p, oop new_obj) { |
da91efe96a93
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|
4793 if (_g1->heap_region_containing_raw(new_obj)->is_young()) { |
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coleenp
parents:
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|
4794 _scanned_klass->record_modified_oops(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4795 } |
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|
4796 } |
da91efe96a93
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|
4797 |
3886
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|
4798 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
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|
4799 template <class T> |
3886
eeae91c9baba
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|
4800 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
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|
4801 ::do_oop_work(T* p) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4802 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4803 assert(barrier != G1BarrierRS || obj != NULL, |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
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|
4804 "Precondition: G1BarrierRS implies obj is non-NULL"); |
3886
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|
4805 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4806 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
4807 |
526 | 4808 // here the null check is implicit in the cset_fast_test() test |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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1245
diff
changeset
|
4809 if (_g1->in_cset_fast_test(obj)) { |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4810 oop forwardee; |
526 | 4811 if (obj->is_forwarded()) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
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|
4812 forwardee = obj->forwardee(); |
526 | 4813 } else { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4814 forwardee = copy_to_survivor_space(obj); |
342 | 4815 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4816 assert(forwardee != NULL, "forwardee should not be NULL"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4817 oopDesc::encode_store_heap_oop(p, forwardee); |
2ace1c4ee8da
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4785
diff
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|
4818 if (do_mark_object && forwardee != obj) { |
2ace1c4ee8da
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|
4819 // If the object is self-forwarded we don't need to explicitly |
2ace1c4ee8da
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4785
diff
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|
4820 // mark it, the evacuation failure protocol will do so. |
2ace1c4ee8da
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parents:
4785
diff
changeset
|
4821 mark_forwarded_object(obj, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4822 } |
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4785
diff
changeset
|
4823 |
526 | 4824 // When scanning the RS, we only care about objs in CS. |
4825 if (barrier == G1BarrierRS) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4834
diff
changeset
|
4826 _par_scan_state->update_rs(_from, p, _worker_id); |
6725
da91efe96a93
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coleenp
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diff
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|
4827 } else if (barrier == G1BarrierKlass) { |
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coleenp
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6629
diff
changeset
|
4828 do_klass_barrier(p, forwardee); |
342 | 4829 } |
3886
eeae91c9baba
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|
4830 } else { |
eeae91c9baba
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|
4831 // The object is not in collection set. If we're a root scanning |
eeae91c9baba
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diff
changeset
|
4832 // closure during an initial mark pause (i.e. do_mark_object will |
eeae91c9baba
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diff
changeset
|
4833 // be true) then attempt to mark the object. |
4787
2ace1c4ee8da
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4785
diff
changeset
|
4834 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
|
4835 mark_object(obj); |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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3869
diff
changeset
|
4836 } |
526 | 4837 } |
4838 | |
4839 if (barrier == G1BarrierEvac && obj != NULL) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4840 _par_scan_state->update_rs(_from, p, _worker_id); |
526 | 4841 } |
4842 | |
4843 if (do_gen_barrier && obj != NULL) { | |
4844 par_do_barrier(p); | |
4845 } | |
4846 } | |
4847 | |
1261
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1245
diff
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|
4848 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
0414c1049f15
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iveresov
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diff
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|
4849 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
df6caf649ff7
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|
4850 |
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diff
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|
4851 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4852 assert(has_partial_array_mask(p), "invariant"); |
4784
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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4783
diff
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|
4853 oop from_obj = clear_partial_array_mask(p); |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4854 |
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diff
changeset
|
4855 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
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4783
diff
changeset
|
4856 assert(from_obj->is_objArray(), "must be obj array"); |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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4783
diff
changeset
|
4857 objArrayOop from_obj_array = objArrayOop(from_obj); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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4783
diff
changeset
|
4858 // The from-space object contains the real length. |
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|
4859 int length = from_obj_array->length(); |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
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|
4860 |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4861 assert(from_obj->is_forwarded(), "must be forwarded"); |
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|
4862 oop to_obj = from_obj->forwardee(); |
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|
4863 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
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diff
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|
4864 objArrayOop to_obj_array = objArrayOop(to_obj); |
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parents:
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diff
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|
4865 // 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
|
4866 // to-space object. |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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diff
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|
4867 int next_index = to_obj_array->length(); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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|
4868 assert(0 <= next_index && next_index < length, |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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diff
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|
4869 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
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tonyp
parents:
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diff
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|
4870 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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diff
changeset
|
4871 int start = next_index; |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4872 int end = length; |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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diff
changeset
|
4873 int remainder = end - start; |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4874 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
342 | 4875 if (remainder > 2 * ParGCArrayScanChunk) { |
4876 end = start + ParGCArrayScanChunk; | |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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|
4877 to_obj_array->set_length(end); |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4878 // Push the remainder before we process the range in case another |
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|
4879 // worker has run out of things to do and can steal it. |
02838862dec8
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|
4880 oop* from_obj_p = set_partial_array_mask(from_obj); |
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|
4881 _par_scan_state->push_on_queue(from_obj_p); |
342 | 4882 } else { |
4784
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|
4883 assert(length == end, "sanity"); |
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|
4884 // We'll process the final range for this object. Restore the length |
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|
4885 // so that the heap remains parsable in case of evacuation failure. |
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|
4886 to_obj_array->set_length(end); |
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|
4887 } |
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|
4888 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
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|
4889 // Process indexes [start,end). It will also process the header |
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|
4890 // along with the first chunk (i.e., the chunk with start == 0). |
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|
4891 // Note that at this point the length field of to_obj_array is not |
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|
4892 // correct given that we are using it to keep track of the next |
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|
4893 // start index. oop_iterate_range() (thankfully!) ignores the length |
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|
4894 // field and only relies on the start / end parameters. It does |
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|
4895 // however return the size of the object which will be incorrect. So |
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|
4896 // we have to ignore it even if we wanted to use it. |
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|
4897 to_obj_array->oop_iterate_range(&_scanner, start, end); |
342 | 4898 } |
4899 | |
4900 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4901 protected: | |
4902 G1CollectedHeap* _g1h; | |
4903 G1ParScanThreadState* _par_scan_state; | |
4904 RefToScanQueueSet* _queues; | |
4905 ParallelTaskTerminator* _terminator; | |
4906 | |
4907 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4908 RefToScanQueueSet* queues() { return _queues; } | |
4909 ParallelTaskTerminator* terminator() { return _terminator; } | |
4910 | |
4911 public: | |
4912 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4913 G1ParScanThreadState* par_scan_state, | |
4914 RefToScanQueueSet* queues, | |
4915 ParallelTaskTerminator* terminator) | |
4916 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4917 _queues(queues), _terminator(terminator) {} | |
4918 | |
1862
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parents:
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|
4919 void do_void(); |
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|
4920 |
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|
4921 private: |
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|
4922 inline bool offer_termination(); |
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|
4923 }; |
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|
4924 |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4925 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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|
4926 G1ParScanThreadState* const pss = par_scan_state(); |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4927 pss->start_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4928 const bool res = terminator()->offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4929 pss->end_term_time(); |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4930 return res; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
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|
4931 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4932 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4933 void G1ParEvacuateFollowersClosure::do_void() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4934 StarTask stolen_task; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4935 G1ParScanThreadState* const pss = par_scan_state(); |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4936 pss->trim_queue(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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changeset
|
4937 |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4938 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4939 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4940 assert(pss->verify_task(stolen_task), "sanity"); |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4941 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
|
4942 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4943 } else { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4944 pss->deal_with_reference((oop*) stolen_task); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4945 } |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
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diff
changeset
|
4946 |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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changeset
|
4947 // 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
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parents:
1862
diff
changeset
|
4948 // 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
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parents:
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diff
changeset
|
4949 // we drain the queues as necessary. |
342 | 4950 pss->trim_queue(); |
4951 } | |
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
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|
4952 } while (!offer_termination()); |
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|
4953 |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4954 pss->retire_alloc_buffers(); |
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diff
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|
4955 } |
342 | 4956 |
6725
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6964458: Reimplement class meta-data storage to use native memory
coleenp
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6629
diff
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|
4957 class G1KlassScanClosure : public KlassClosure { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
4958 G1ParCopyHelper* _closure; |
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6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
4959 bool _process_only_dirty; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
4960 int _count; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4961 public: |
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|
4962 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) |
da91efe96a93
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coleenp
parents:
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|
4963 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {} |
da91efe96a93
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coleenp
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|
4964 void do_klass(Klass* klass) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
4965 // If the klass has not been dirtied we know that there's |
da91efe96a93
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coleenp
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|
4966 // no references into the young gen and we can skip it. |
da91efe96a93
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diff
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|
4967 if (!_process_only_dirty || klass->has_modified_oops()) { |
da91efe96a93
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coleenp
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|
4968 // Clean the klass since we're going to scavenge all the metadata. |
da91efe96a93
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coleenp
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diff
changeset
|
4969 klass->clear_modified_oops(); |
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|
4970 |
da91efe96a93
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|
4971 // Tell the closure that this klass is the Klass to scavenge |
da91efe96a93
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|
4972 // and is the one to dirty if oops are left pointing into the young gen. |
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coleenp
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|
4973 _closure->set_scanned_klass(klass); |
da91efe96a93
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|
4974 |
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|
4975 klass->oops_do(_closure); |
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|
4976 |
da91efe96a93
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|
4977 _closure->set_scanned_klass(NULL); |
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|
4978 } |
da91efe96a93
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|
4979 _count++; |
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|
4980 } |
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|
4981 }; |
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|
4982 |
342 | 4983 class G1ParTask : public AbstractGangTask { |
4984 protected: | |
4985 G1CollectedHeap* _g1h; | |
4986 RefToScanQueueSet *_queues; | |
4987 ParallelTaskTerminator _terminator; | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4988 uint _n_workers; |
342 | 4989 |
4990 Mutex _stats_lock; | |
4991 Mutex* stats_lock() { return &_stats_lock; } | |
4992 | |
4993 size_t getNCards() { | |
4994 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4995 / G1BlockOffsetSharedArray::N_bytes; | |
4996 } | |
4997 | |
4998 public: | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
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|
4999 G1ParTask(G1CollectedHeap* g1h, |
bca17e38de00
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diff
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|
5000 RefToScanQueueSet *task_queues) |
342 | 5001 : AbstractGangTask("G1 collection"), |
5002 _g1h(g1h), | |
5003 _queues(task_queues), | |
4095
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4090
diff
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|
5004 _terminator(0, _queues), |
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|
5005 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 5006 {} |
5007 | |
5008 RefToScanQueueSet* queues() { return _queues; } | |
5009 | |
5010 RefToScanQueue *work_queue(int i) { | |
5011 return queues()->queue(i); | |
5012 } | |
5013 | |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5014 ParallelTaskTerminator* terminator() { return &_terminator; } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
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|
5015 |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
5016 virtual void set_for_termination(int active_workers) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
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|
5017 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
bca17e38de00
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jmasa
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|
5018 // in the young space (_par_seq_tasks) in the G1 heap |
bca17e38de00
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4090
diff
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|
5019 // for SequentialSubTasksDone. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5020 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
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|
5021 // both of which need setting by set_n_termination(). |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5022 _g1h->SharedHeap::set_n_termination(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
5023 _g1h->set_n_termination(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5024 terminator()->reset_for_reuse(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
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diff
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|
5025 _n_workers = active_workers; |
bca17e38de00
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jmasa
parents:
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diff
changeset
|
5026 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5027 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5028 void work(uint worker_id) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
changeset
|
5029 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 5030 |
5031 double start_time_ms = os::elapsedTime() * 1000.0; | |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
5032 _g1h->g1_policy()->phase_times()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 5033 |
5986
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diff
changeset
|
5034 { |
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diff
changeset
|
5035 ResourceMark rm; |
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parents:
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diff
changeset
|
5036 HandleMark hm; |
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diff
changeset
|
5037 |
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changeset
|
5038 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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changeset
|
5039 |
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diff
changeset
|
5040 G1ParScanThreadState pss(_g1h, worker_id); |
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changeset
|
5041 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
500023bd0818
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|
5042 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
500023bd0818
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changeset
|
5043 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
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|
5044 |
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changeset
|
5045 pss.set_evac_closure(&scan_evac_cl); |
500023bd0818
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diff
changeset
|
5046 pss.set_evac_failure_closure(&evac_failure_cl); |
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diff
changeset
|
5047 pss.set_partial_scan_closure(&partial_scan_cl); |
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diff
changeset
|
5048 |
500023bd0818
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diff
changeset
|
5049 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
5050 G1ParScanMetadataClosure only_scan_metadata_cl(_g1h, &pss, rp); |
5986
500023bd0818
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changeset
|
5051 |
500023bd0818
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diff
changeset
|
5052 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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changeset
|
5053 G1ParScanAndMarkMetadataClosure scan_mark_metadata_cl(_g1h, &pss, rp); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
5054 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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changeset
|
5055 bool only_young = _g1h->g1_policy()->gcs_are_young(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
5056 G1KlassScanClosure scan_mark_klasses_cl_s(&scan_mark_metadata_cl, false); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
5057 G1KlassScanClosure only_scan_klasses_cl_s(&only_scan_metadata_cl, only_young); |
5986
500023bd0818
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changeset
|
5058 |
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diff
changeset
|
5059 OopClosure* scan_root_cl = &only_scan_root_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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changeset
|
5060 G1KlassScanClosure* scan_klasses_cl = &only_scan_klasses_cl_s; |
5986
500023bd0818
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diff
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|
5061 |
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diff
changeset
|
5062 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
500023bd0818
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parents:
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diff
changeset
|
5063 // We also need to mark copied objects. |
500023bd0818
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parents:
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diff
changeset
|
5064 scan_root_cl = &scan_mark_root_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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changeset
|
5065 scan_klasses_cl = &scan_mark_klasses_cl_s; |
5986
500023bd0818
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parents:
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diff
changeset
|
5066 } |
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diff
changeset
|
5067 |
500023bd0818
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diff
changeset
|
5068 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
500023bd0818
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diff
changeset
|
5069 |
12080 | 5070 // Don't scan the scavengable methods in the code cache as part |
5071 // of strong root scanning. The code roots that point into a | |
5072 // region in the collection set are scanned when we scan the | |
5073 // region's RSet. | |
5074 int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
5075 |
5986
500023bd0818
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diff
changeset
|
5076 pss.start_strong_roots(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
5077 _g1h->g1_process_strong_roots(/* is scavenging */ true, |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
5078 SharedHeap::ScanningOption(so), |
5986
500023bd0818
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5963
diff
changeset
|
5079 scan_root_cl, |
500023bd0818
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parents:
5963
diff
changeset
|
5080 &push_heap_rs_cl, |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6629
diff
changeset
|
5081 scan_klasses_cl, |
5986
500023bd0818
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5963
diff
changeset
|
5082 worker_id); |
500023bd0818
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parents:
5963
diff
changeset
|
5083 pss.end_strong_roots(); |
500023bd0818
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parents:
5963
diff
changeset
|
5084 |
500023bd0818
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parents:
5963
diff
changeset
|
5085 { |
500023bd0818
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parents:
5963
diff
changeset
|
5086 double start = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5087 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5088 evac.do_void(); |
500023bd0818
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parents:
5963
diff
changeset
|
5089 double elapsed_ms = (os::elapsedTime()-start)*1000.0; |
500023bd0818
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johnc
parents:
5963
diff
changeset
|
5090 double term_ms = pss.term_time()*1000.0; |
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
|
5091 _g1h->g1_policy()->phase_times()->add_obj_copy_time(worker_id, elapsed_ms-term_ms); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5092 _g1h->g1_policy()->phase_times()->record_termination(worker_id, term_ms, pss.term_attempts()); |
5986
500023bd0818
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parents:
5963
diff
changeset
|
5093 } |
500023bd0818
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parents:
5963
diff
changeset
|
5094 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
500023bd0818
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parents:
5963
diff
changeset
|
5095 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
500023bd0818
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parents:
5963
diff
changeset
|
5096 |
500023bd0818
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5963
diff
changeset
|
5097 if (ParallelGCVerbose) { |
500023bd0818
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johnc
parents:
5963
diff
changeset
|
5098 MutexLocker x(stats_lock()); |
500023bd0818
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johnc
parents:
5963
diff
changeset
|
5099 pss.print_termination_stats(worker_id); |
500023bd0818
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parents:
5963
diff
changeset
|
5100 } |
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5963
diff
changeset
|
5101 |
500023bd0818
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parents:
5963
diff
changeset
|
5102 assert(pss.refs()->is_empty(), "should be empty"); |
500023bd0818
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5963
diff
changeset
|
5103 |
500023bd0818
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5963
diff
changeset
|
5104 // Close the inner scope so that the ResourceMark and HandleMark |
500023bd0818
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5963
diff
changeset
|
5105 // destructors are executed here and are included as part of the |
500023bd0818
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5963
diff
changeset
|
5106 // "GC Worker Time". |
342 | 5107 } |
5108 | |
1611 | 5109 double end_time_ms = os::elapsedTime() * 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
|
5110 _g1h->g1_policy()->phase_times()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 5111 } |
5112 }; | |
5113 | |
5114 // *** Common G1 Evacuation Stuff | |
5115 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5116 // This method is run in a GC worker. |
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
5117 |
342 | 5118 void |
5119 G1CollectedHeap:: | |
6725
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6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
5120 g1_process_strong_roots(bool is_scavenging, |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
5121 ScanningOption so, |
342 | 5122 OopClosure* scan_non_heap_roots, |
5123 OopsInHeapRegionClosure* scan_rs, | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
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|
5124 G1KlassScanClosure* scan_klasses, |
342 | 5125 int worker_i) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
5126 |
6725
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diff
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|
5127 // First scan the strong roots |
342 | 5128 double ext_roots_start = os::elapsedTime(); |
5129 double closure_app_time_sec = 0.0; | |
5130 | |
5131 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
5132 | |
12080 | 5133 assert(so & SO_CodeCache || scan_rs != NULL, "must scan code roots somehow"); |
5134 // Walk the code cache/strong code roots w/o buffering, because StarTask | |
5135 // cannot handle unaligned oop locations. | |
5136 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, true /* do_marking */); | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5137 |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5138 process_strong_roots(false, // no scoping; this is parallel code |
6725
da91efe96a93
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6629
diff
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|
5139 is_scavenging, so, |
342 | 5140 &buf_scan_non_heap_roots, |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5141 &eager_scan_code_roots, |
6725
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6629
diff
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|
5142 scan_klasses |
da91efe96a93
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diff
changeset
|
5143 ); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5144 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5145 // Now the CM ref_processor roots. |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
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3778
diff
changeset
|
5146 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5147 // We need to treat the discovered reference lists of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5148 // concurrent mark ref processor as roots and keep entries |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5149 // (which are added by the marking threads) on them live |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5150 // until they can be processed at the end of marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5151 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
14a2fd14c0db
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johnc
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3778
diff
changeset
|
5152 } |
14a2fd14c0db
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johnc
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3778
diff
changeset
|
5153 |
14a2fd14c0db
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3778
diff
changeset
|
5154 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 5155 buf_scan_non_heap_roots.done(); |
6725
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|
5156 |
da91efe96a93
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6629
diff
changeset
|
5157 double obj_copy_time_sec = buf_scan_non_heap_roots.closure_app_seconds(); |
da91efe96a93
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|
5158 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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|
5159 g1_policy()->phase_times()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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diff
changeset
|
5160 |
342 | 5161 double ext_root_time_ms = |
6628
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|
5162 ((os::elapsedTime() - ext_roots_start) - obj_copy_time_sec) * 1000.0; |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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3778
diff
changeset
|
5163 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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diff
changeset
|
5164 g1_policy()->phase_times()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
342 | 5165 |
4787
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|
5166 // During conc marking we have to filter the per-thread SATB buffers |
2ace1c4ee8da
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diff
changeset
|
5167 // to make sure we remove any oops into the CSet (which will show up |
2ace1c4ee8da
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diff
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|
5168 // as implicitly live). |
6628
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changeset
|
5169 double satb_filtering_ms = 0.0; |
4787
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diff
changeset
|
5170 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
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diff
changeset
|
5171 if (mark_in_progress()) { |
6628
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diff
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|
5172 double satb_filter_start = os::elapsedTime(); |
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7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
5173 |
4787
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changeset
|
5174 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
6628
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|
5175 |
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|
5176 satb_filtering_ms = (os::elapsedTime() - satb_filter_start) * 1000.0; |
4787
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|
5177 } |
2ace1c4ee8da
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|
5178 } |
6219
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|
5179 g1_policy()->phase_times()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
342 | 5180 |
12080 | 5181 // If this is an initial mark pause, and we're not scanning |
5182 // the entire code cache, we need to mark the oops in the | |
5183 // strong code root lists for the regions that are not in | |
5184 // the collection set. | |
5185 // Note all threads participate in this set of root tasks. | |
5186 double mark_strong_code_roots_ms = 0.0; | |
5187 if (g1_policy()->during_initial_mark_pause() && !(so & SO_CodeCache)) { | |
5188 double mark_strong_roots_start = os::elapsedTime(); | |
5189 mark_strong_code_roots(worker_i); | |
5190 mark_strong_code_roots_ms = (os::elapsedTime() - mark_strong_roots_start) * 1000.0; | |
5191 } | |
5192 g1_policy()->phase_times()->record_strong_code_root_mark_time(worker_i, mark_strong_code_roots_ms); | |
5193 | |
342 | 5194 // Now scan the complement of the collection set. |
5195 if (scan_rs != NULL) { | |
12080 | 5196 g1_rem_set()->oops_into_collection_set_do(scan_rs, &eager_scan_code_roots, worker_i); |
342 | 5197 } |
5198 _process_strong_tasks->all_tasks_completed(); | |
5199 } | |
5200 | |
5201 void | |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
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diff
changeset
|
5202 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
5203 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
10179
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|
5204 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs); |
342 | 5205 } |
5206 | |
3979
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|
5207 // Weak Reference Processing support |
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|
5208 |
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|
5209 // An always "is_alive" closure that is used to preserve referents. |
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5210 // If the object is non-null then it's alive. Used in the preservation |
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|
5211 // of referent objects that are pointed to by reference objects |
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|
5212 // discovered by the CM ref processor. |
4dfb2df418f2
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|
5213 class G1AlwaysAliveClosure: public BoolObjectClosure { |
4dfb2df418f2
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|
5214 G1CollectedHeap* _g1; |
4dfb2df418f2
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changeset
|
5215 public: |
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diff
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|
5216 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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|
5217 bool do_object_b(oop p) { |
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diff
changeset
|
5218 if (p != NULL) { |
4dfb2df418f2
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diff
changeset
|
5219 return true; |
4dfb2df418f2
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diff
changeset
|
5220 } |
4dfb2df418f2
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diff
changeset
|
5221 return false; |
4dfb2df418f2
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diff
changeset
|
5222 } |
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diff
changeset
|
5223 }; |
4dfb2df418f2
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diff
changeset
|
5224 |
4dfb2df418f2
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diff
changeset
|
5225 bool G1STWIsAliveClosure::do_object_b(oop p) { |
4dfb2df418f2
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diff
changeset
|
5226 // An object is reachable if it is outside the collection set, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5227 // or is inside and copied. |
4dfb2df418f2
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diff
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|
5228 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5229 } |
4dfb2df418f2
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diff
changeset
|
5230 |
4dfb2df418f2
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diff
changeset
|
5231 // Non Copying Keep Alive closure |
4dfb2df418f2
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parents:
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diff
changeset
|
5232 class G1KeepAliveClosure: public OopClosure { |
4dfb2df418f2
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parents:
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diff
changeset
|
5233 G1CollectedHeap* _g1; |
4dfb2df418f2
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diff
changeset
|
5234 public: |
4dfb2df418f2
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diff
changeset
|
5235 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
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|
5236 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
4dfb2df418f2
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diff
changeset
|
5237 void do_oop( oop* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5238 oop obj = *p; |
4dfb2df418f2
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diff
changeset
|
5239 |
4dfb2df418f2
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diff
changeset
|
5240 if (_g1->obj_in_cs(obj)) { |
4dfb2df418f2
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diff
changeset
|
5241 assert( obj->is_forwarded(), "invariant" ); |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5242 *p = obj->forwardee(); |
4dfb2df418f2
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parents:
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diff
changeset
|
5243 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5244 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5245 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5246 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5247 // Copying Keep Alive closure - can be called from both |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 // serial and parallel code as long as different worker |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 // threads utilize different G1ParScanThreadState instances |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 // and different queues. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5251 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5252 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5254 OopClosure* _copy_non_heap_obj_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6629
diff
changeset
|
5255 OopsInHeapRegionClosure* _copy_metadata_obj_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5256 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5257 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5258 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
5259 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5260 OopClosure* non_heap_obj_cl, |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5261 OopsInHeapRegionClosure* metadata_obj_cl, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 G1ParScanThreadState* pss): |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5263 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 _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
|
5265 _copy_metadata_obj_cl(metadata_obj_cl), |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5268 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5269 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 virtual void do_oop( oop* p) { do_oop_work(p); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5272 template <class T> void do_oop_work(T* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 oop obj = oopDesc::load_decode_heap_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5275 if (_g1h->obj_in_cs(obj)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 // If the referent object has been forwarded (either copied |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5277 // to a new location or to itself in the event of an |
4dfb2df418f2
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parents:
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diff
changeset
|
5278 // evacuation failure) then we need to update the reference |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5279 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5280 // heap, update the RSet for the referent. |
4dfb2df418f2
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parents:
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diff
changeset
|
5281 // |
4dfb2df418f2
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diff
changeset
|
5282 // If the referent has not been forwarded then we have to keep |
4dfb2df418f2
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johnc
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diff
changeset
|
5283 // it alive by policy. Therefore we have copy the referent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5284 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5285 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5286 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 // phase of reference processing) the object and it's followers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5288 // will be copied, the reference field set to point to the |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5289 // new location, and the RSet updated. Otherwise we need to |
6725
da91efe96a93
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coleenp
parents:
6629
diff
changeset
|
5290 // use the the non-heap or metadata closures directly to copy |
10405 | 5291 // the referent object and update the pointer, while avoiding |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5292 // updating the RSet. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5293 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5294 if (_g1h->is_in_g1_reserved(p)) { |
4dfb2df418f2
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diff
changeset
|
5295 _par_scan_state->push_on_queue(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5296 } else { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6629
diff
changeset
|
5297 assert(!ClassLoaderDataGraph::contains((address)p), |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5298 err_msg("Otherwise need to call _copy_metadata_obj_cl->do_oop(p) " |
da91efe96a93
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coleenp
parents:
6629
diff
changeset
|
5299 PTR_FORMAT, p)); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5300 _copy_non_heap_obj_cl->do_oop(p); |
4dfb2df418f2
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3973
diff
changeset
|
5301 } |
4dfb2df418f2
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diff
changeset
|
5302 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5303 } |
4dfb2df418f2
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diff
changeset
|
5304 }; |
4dfb2df418f2
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diff
changeset
|
5305 |
4dfb2df418f2
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changeset
|
5306 // Serial drain queue closure. Called as the 'complete_gc' |
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|
5307 // closure for each discovered list in some of the |
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parents:
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diff
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|
5308 // reference processing phases. |
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diff
changeset
|
5309 |
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|
5310 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
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|
5311 protected: |
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diff
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|
5312 G1CollectedHeap* _g1h; |
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|
5313 G1ParScanThreadState* _par_scan_state; |
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|
5314 |
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|
5315 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
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changeset
|
5316 |
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parents:
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diff
changeset
|
5317 public: |
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diff
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|
5318 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
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|
5319 _g1h(g1h), |
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diff
changeset
|
5320 _par_scan_state(pss) |
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parents:
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diff
changeset
|
5321 { } |
4dfb2df418f2
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parents:
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diff
changeset
|
5322 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5323 void do_void() { |
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parents:
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diff
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|
5324 G1ParScanThreadState* const pss = par_scan_state(); |
4dfb2df418f2
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|
5325 pss->trim_queue(); |
4dfb2df418f2
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parents:
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diff
changeset
|
5326 } |
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parents:
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diff
changeset
|
5327 }; |
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parents:
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diff
changeset
|
5328 |
4dfb2df418f2
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parents:
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diff
changeset
|
5329 // Parallel Reference Processing closures |
4dfb2df418f2
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parents:
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diff
changeset
|
5330 |
4dfb2df418f2
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parents:
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diff
changeset
|
5331 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
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parents:
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diff
changeset
|
5332 // processing during G1 evacuation pauses. |
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parents:
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diff
changeset
|
5333 |
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|
5334 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
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parents:
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|
5335 private: |
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parents:
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diff
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|
5336 G1CollectedHeap* _g1h; |
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|
5337 RefToScanQueueSet* _queues; |
4095
bca17e38de00
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|
5338 FlexibleWorkGang* _workers; |
3979
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|
5339 int _active_workers; |
4dfb2df418f2
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parents:
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changeset
|
5340 |
4dfb2df418f2
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|
5341 public: |
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|
5342 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
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|
5343 FlexibleWorkGang* workers, |
3979
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diff
changeset
|
5344 RefToScanQueueSet *task_queues, |
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diff
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|
5345 int n_workers) : |
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parents:
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diff
changeset
|
5346 _g1h(g1h), |
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diff
changeset
|
5347 _queues(task_queues), |
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parents:
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diff
changeset
|
5348 _workers(workers), |
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parents:
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diff
changeset
|
5349 _active_workers(n_workers) |
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parents:
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diff
changeset
|
5350 { |
4dfb2df418f2
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diff
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|
5351 assert(n_workers > 0, "shouldn't call this otherwise"); |
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parents:
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diff
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|
5352 } |
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parents:
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diff
changeset
|
5353 |
4dfb2df418f2
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parents:
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diff
changeset
|
5354 // Executes the given task using concurrent marking worker threads. |
4dfb2df418f2
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parents:
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diff
changeset
|
5355 virtual void execute(ProcessTask& task); |
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parents:
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diff
changeset
|
5356 virtual void execute(EnqueueTask& task); |
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parents:
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diff
changeset
|
5357 }; |
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parents:
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diff
changeset
|
5358 |
4dfb2df418f2
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parents:
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diff
changeset
|
5359 // Gang task for possibly parallel reference processing |
4dfb2df418f2
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parents:
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diff
changeset
|
5360 |
4dfb2df418f2
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parents:
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diff
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|
5361 class G1STWRefProcTaskProxy: public AbstractGangTask { |
4dfb2df418f2
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parents:
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diff
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|
5362 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
4dfb2df418f2
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parents:
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diff
changeset
|
5363 ProcessTask& _proc_task; |
4dfb2df418f2
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parents:
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diff
changeset
|
5364 G1CollectedHeap* _g1h; |
4dfb2df418f2
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parents:
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diff
changeset
|
5365 RefToScanQueueSet *_task_queues; |
4dfb2df418f2
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parents:
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diff
changeset
|
5366 ParallelTaskTerminator* _terminator; |
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:
3973
diff
changeset
|
5368 public: |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5369 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5370 G1CollectedHeap* g1h, |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5371 RefToScanQueueSet *task_queues, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 ParallelTaskTerminator* terminator) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5373 AbstractGangTask("Process reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5374 _proc_task(proc_task), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5375 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5376 _task_queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5377 _terminator(terminator) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5378 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5379 |
4728
441e946dc1af
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jmasa
parents:
4711
diff
changeset
|
5380 virtual void work(uint worker_id) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5381 // The reference processing task executed by a single worker. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5382 ResourceMark rm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5383 HandleMark hm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5384 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5385 G1STWIsAliveClosure is_alive(_g1h); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5386 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5387 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5388 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5389 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5390 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5391 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5392 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5393 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5394 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5395 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5396 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5397 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5398 G1ParScanMetadataClosure only_copy_metadata_cl(_g1h, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5399 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5400 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5401 G1ParScanAndMarkMetadataClosure copy_mark_metadata_cl(_g1h, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5402 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5403 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
|
5404 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5405 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5406 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5407 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5408 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
|
5409 copy_metadata_cl = ©_mark_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5410 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5411 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5412 // Keep alive closure. |
6725
da91efe96a93
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coleenp
parents:
6629
diff
changeset
|
5413 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:
3973
diff
changeset
|
5414 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5415 // Complete GC closure |
4dfb2df418f2
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parents:
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diff
changeset
|
5416 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
4dfb2df418f2
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diff
changeset
|
5417 |
4dfb2df418f2
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3973
diff
changeset
|
5418 // Call the reference processing task's work routine. |
4728
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jmasa
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diff
changeset
|
5419 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5420 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5421 // Note we cannot assert that the refs array is empty here as not all |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5422 // of the processing tasks (specifically phase2 - pp2_work) execute |
4dfb2df418f2
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3973
diff
changeset
|
5423 // the complete_gc closure (which ordinarily would drain the queue) so |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5424 // the queue may not be empty. |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5425 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5426 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5427 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5428 // Driver routine for parallel reference processing. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5429 // Creates an instance of the ref processing gang |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5430 // task and has the worker threads execute it. |
4dfb2df418f2
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parents:
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diff
changeset
|
5431 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5432 assert(_workers != NULL, "Need parallel worker threads."); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5433 |
4dfb2df418f2
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parents:
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diff
changeset
|
5434 ParallelTaskTerminator terminator(_active_workers, _queues); |
4dfb2df418f2
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parents:
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diff
changeset
|
5435 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5436 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5437 _g1h->set_par_threads(_active_workers); |
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|
5438 _workers->run_task(&proc_task_proxy); |
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|
5439 _g1h->set_par_threads(0); |
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|
5440 } |
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|
5441 |
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|
5442 // Gang task for parallel reference enqueueing. |
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|
5443 |
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|
5444 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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|
5445 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
5446 EnqueueTask& _enq_task; |
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|
5447 |
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|
5448 public: |
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|
5449 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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|
5450 AbstractGangTask("Enqueue reference objects in parallel"), |
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|
5451 _enq_task(enq_task) |
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|
5452 { } |
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|
5453 |
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|
5454 virtual void work(uint worker_id) { |
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|
5455 _enq_task.work(worker_id); |
3979
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|
5456 } |
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|
5457 }; |
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|
5458 |
10405 | 5459 // Driver routine for parallel reference enqueueing. |
3979
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|
5460 // Creates an instance of the ref enqueueing gang |
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|
5461 // task and has the worker threads execute it. |
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changeset
|
5462 |
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|
5463 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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|
5464 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5465 |
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|
5466 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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|
5467 |
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|
5468 _g1h->set_par_threads(_active_workers); |
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|
5469 _workers->run_task(&enq_task_proxy); |
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|
5470 _g1h->set_par_threads(0); |
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|
5471 } |
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|
5472 |
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|
5473 // End of weak reference support closures |
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|
5474 |
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|
5475 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5476 // that are in the collection set and are pointed to by reference |
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|
5477 // objects discovered by the CM ref processor. |
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|
5478 |
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|
5479 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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|
5480 protected: |
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parents:
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diff
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|
5481 G1CollectedHeap* _g1h; |
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diff
changeset
|
5482 RefToScanQueueSet *_queues; |
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|
5483 ParallelTaskTerminator _terminator; |
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|
5484 uint _n_workers; |
3979
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diff
changeset
|
5485 |
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parents:
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changeset
|
5486 public: |
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parents:
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diff
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|
5487 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
4dfb2df418f2
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|
5488 AbstractGangTask("ParPreserveCMReferents"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5489 _g1h(g1h), |
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parents:
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diff
changeset
|
5490 _queues(task_queues), |
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parents:
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diff
changeset
|
5491 _terminator(workers, _queues), |
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parents:
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diff
changeset
|
5492 _n_workers(workers) |
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diff
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|
5493 { } |
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|
5494 |
4728
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|
5495 void work(uint worker_id) { |
3979
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|
5496 ResourceMark rm; |
4dfb2df418f2
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diff
changeset
|
5497 HandleMark hm; |
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|
5498 |
4728
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|
5499 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5500 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5501 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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parents:
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|
5502 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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parents:
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diff
changeset
|
5503 |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5504 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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diff
changeset
|
5505 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
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parents:
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diff
changeset
|
5506 pss.set_partial_scan_closure(&partial_scan_cl); |
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parents:
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diff
changeset
|
5507 |
4dfb2df418f2
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parents:
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diff
changeset
|
5508 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
4dfb2df418f2
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parents:
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diff
changeset
|
5509 |
4dfb2df418f2
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parents:
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diff
changeset
|
5510 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5511 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5512 G1ParScanMetadataClosure only_copy_metadata_cl(_g1h, &pss, NULL); |
3979
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5513 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5514 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5515 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
|
5516 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5517 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6629
diff
changeset
|
5518 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5519 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5520 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5521 // We also need to mark copied objects. |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5522 copy_non_heap_cl = ©_mark_non_heap_cl; |
6725
da91efe96a93
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coleenp
parents:
6629
diff
changeset
|
5523 copy_metadata_cl = ©_mark_metadata_cl; |
3979
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5524 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5525 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5526 // Is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5527 G1AlwaysAliveClosure always_alive(_g1h); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5528 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5529 // Copying keep alive closure. Applied to referent objects that need |
4dfb2df418f2
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3973
diff
changeset
|
5530 // to be copied. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5531 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
|
5532 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5533 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
4dfb2df418f2
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parents:
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diff
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|
5534 |
4728
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7121618: Change type of number of GC workers to unsigned int.
jmasa
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diff
changeset
|
5535 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
changeset
|
5536 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5537 |
4dfb2df418f2
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diff
changeset
|
5538 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
4dfb2df418f2
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diff
changeset
|
5539 // So this must be true - but assert just in case someone decides to |
4dfb2df418f2
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diff
changeset
|
5540 // change the worker ids. |
4728
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jmasa
parents:
4711
diff
changeset
|
5541 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
4dfb2df418f2
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diff
changeset
|
5542 assert(!rp->discovery_is_atomic(), "check this code"); |
4dfb2df418f2
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parents:
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diff
changeset
|
5543 |
4dfb2df418f2
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diff
changeset
|
5544 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
441e946dc1af
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jmasa
parents:
4711
diff
changeset
|
5545 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5546 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5547 |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5548 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5549 while (iter.has_next()) { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5550 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
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parents:
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diff
changeset
|
5551 // can see some null referent objects. |
4dfb2df418f2
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parents:
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diff
changeset
|
5552 iter.load_ptrs(DEBUG_ONLY(true)); |
4dfb2df418f2
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parents:
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diff
changeset
|
5553 oop ref = iter.obj(); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5554 |
4dfb2df418f2
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parents:
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diff
changeset
|
5555 // This will filter nulls. |
4dfb2df418f2
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parents:
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diff
changeset
|
5556 if (iter.is_referent_alive()) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5557 iter.make_referent_alive(); |
4dfb2df418f2
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parents:
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diff
changeset
|
5558 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5559 iter.move_to_next(); |
4dfb2df418f2
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parents:
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diff
changeset
|
5560 } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5561 } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5562 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5563 // Drain the queue - which may cause stealing |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5564 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
4dfb2df418f2
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parents:
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diff
changeset
|
5565 drain_queue.do_void(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5566 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
4dfb2df418f2
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|
5567 assert(pss.refs()->is_empty(), "should be"); |
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diff
changeset
|
5568 } |
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diff
changeset
|
5569 }; |
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diff
changeset
|
5570 |
4dfb2df418f2
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diff
changeset
|
5571 // Weak Reference processing during an evacuation pause (part 1). |
6819 | 5572 void G1CollectedHeap::process_discovered_references(uint no_of_gc_workers) { |
3979
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changeset
|
5573 double ref_proc_start = os::elapsedTime(); |
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changeset
|
5574 |
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diff
changeset
|
5575 ReferenceProcessor* rp = _ref_processor_stw; |
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diff
changeset
|
5576 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5577 |
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6484982: G1: process references during evacuation pauses
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diff
changeset
|
5578 // Any reference objects, in the collection set, that were 'discovered' |
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diff
changeset
|
5579 // by the CM ref processor should have already been copied (either by |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5580 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
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diff
changeset
|
5581 // by following an RSet entry). |
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diff
changeset
|
5582 // |
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diff
changeset
|
5583 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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changeset
|
5584 // reference objects point to may not have been copied: the STW ref |
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diff
changeset
|
5585 // processor would have seen that the reference object had already |
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diff
changeset
|
5586 // been 'discovered' and would have skipped discovering the reference, |
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diff
changeset
|
5587 // but would not have treated the reference object as a regular oop. |
10405 | 5588 // As a result the copy closure would not have been applied to the |
3979
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diff
changeset
|
5589 // referent object. |
4dfb2df418f2
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diff
changeset
|
5590 // |
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diff
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|
5591 // We need to explicitly copy these referent objects - the references |
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changeset
|
5592 // will be processed at the end of remarking. |
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diff
changeset
|
5593 // |
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diff
changeset
|
5594 // We also need to do this copying before we process the reference |
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|
5595 // objects discovered by the STW ref processor in case one of these |
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|
5596 // referents points to another object which is also referenced by an |
4dfb2df418f2
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diff
changeset
|
5597 // object discovered by the STW ref processor. |
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|
5598 |
4711 | 5599 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
6819 | 5600 no_of_gc_workers == workers()->active_workers(), |
5601 "Need to reset active GC workers"); | |
5602 | |
5603 set_par_threads(no_of_gc_workers); | |
5604 G1ParPreserveCMReferentsTask keep_cm_referents(this, | |
5605 no_of_gc_workers, | |
5606 _task_queues); | |
3979
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diff
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|
5607 |
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diff
changeset
|
5608 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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diff
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|
5609 workers()->run_task(&keep_cm_referents); |
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6484982: G1: process references during evacuation pauses
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diff
changeset
|
5610 } else { |
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diff
changeset
|
5611 keep_cm_referents.work(0); |
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diff
changeset
|
5612 } |
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diff
changeset
|
5613 |
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diff
changeset
|
5614 set_par_threads(0); |
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diff
changeset
|
5615 |
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diff
changeset
|
5616 // Closure to test whether a referent is alive. |
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diff
changeset
|
5617 G1STWIsAliveClosure is_alive(this); |
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diff
changeset
|
5618 |
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diff
changeset
|
5619 // Even when parallel reference processing is enabled, the processing |
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diff
changeset
|
5620 // of JNI refs is serial and performed serially by the current thread |
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diff
changeset
|
5621 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
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parents:
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diff
changeset
|
5622 // JNI refs. |
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parents:
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diff
changeset
|
5623 |
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diff
changeset
|
5624 // Use only a single queue for this PSS. |
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diff
changeset
|
5625 G1ParScanThreadState pss(this, 0); |
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parents:
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diff
changeset
|
5626 |
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parents:
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diff
changeset
|
5627 // We do not embed a reference processor in the copying/scanning |
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parents:
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diff
changeset
|
5628 // closures while we're actually processing the discovered |
4dfb2df418f2
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parents:
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diff
changeset
|
5629 // reference objects. |
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diff
changeset
|
5630 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
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parents:
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diff
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|
5631 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
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parents:
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diff
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|
5632 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
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parents:
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diff
changeset
|
5633 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5634 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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parents:
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diff
changeset
|
5635 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
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parents:
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diff
changeset
|
5636 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5637 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5638 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5639 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5640 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
|
5641 G1ParScanMetadataClosure only_copy_metadata_cl(this, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5642 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5643 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
|
5644 G1ParScanAndMarkMetadataClosure copy_mark_metadata_cl(this, &pss, NULL); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5645 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5646 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
|
5647 OopsInHeapRegionClosure* copy_metadata_cl = &only_copy_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5648 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5649 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5650 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5651 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
|
5652 copy_metadata_cl = ©_mark_metadata_cl; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5653 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5654 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5655 // Keep alive closure. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
5656 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
|
5657 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5658 // Serial Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5659 G1STWDrainQueueClosure drain_queue(this, &pss); |
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 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5662 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5663 |
10405 | 5664 ReferenceProcessorStats stats; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5665 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5666 // Serial reference processing... |
10405 | 5667 stats = rp->process_discovered_references(&is_alive, |
5668 &keep_alive, | |
5669 &drain_queue, | |
5670 NULL, | |
5671 _gc_timer_stw); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5672 } else { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5673 // Parallel reference processing |
6819 | 5674 assert(rp->num_q() == no_of_gc_workers, "sanity"); |
5675 assert(no_of_gc_workers <= rp->max_num_q(), "sanity"); | |
5676 | |
5677 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, no_of_gc_workers); | |
10405 | 5678 stats = rp->process_discovered_references(&is_alive, |
5679 &keep_alive, | |
5680 &drain_queue, | |
5681 &par_task_executor, | |
5682 _gc_timer_stw); | |
5683 } | |
5684 | |
5685 _gc_tracer_stw->report_gc_reference_stats(stats); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5686 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5687 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5688 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5689 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5690 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5691 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5692 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
|
5693 g1_policy()->phase_times()->record_ref_proc_time(ref_proc_time * 1000.0); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5694 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5695 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5696 // Weak Reference processing during an evacuation pause (part 2). |
6819 | 5697 void G1CollectedHeap::enqueue_discovered_references(uint no_of_gc_workers) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5698 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5699 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5700 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5701 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
|
5702 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5703 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5704 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5705 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5706 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5707 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5708 } else { |
10405 | 5709 // Parallel reference enqueueing |
3979
4dfb2df418f2
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parents:
3973
diff
changeset
|
5710 |
6819 | 5711 assert(no_of_gc_workers == workers()->active_workers(), |
5712 "Need to reset active workers"); | |
5713 assert(rp->num_q() == no_of_gc_workers, "sanity"); | |
5714 assert(no_of_gc_workers <= rp->max_num_q(), "sanity"); | |
5715 | |
5716 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, no_of_gc_workers); | |
3979
4dfb2df418f2
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parents:
3973
diff
changeset
|
5717 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5718 } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5719 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5720 rp->verify_no_references_recorded(); |
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6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5721 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5722 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5723 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5724 // 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
|
5725 // Should we do that here also? We could, but it is a serial operation |
10405 | 5726 // and could significantly increase the pause time. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5727 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5728 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5729 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
|
5730 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5731 |
10405 | 5732 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
|
5733 _expand_heap_after_alloc_failure = true; |
10405 | 5734 _evacuation_failed = false; |
342 | 5735 |
6629
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5736 // Should G1EvacuationFailureALot be in effect for this GC? |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5737 NOT_PRODUCT(set_evacuation_failure_alot_for_current_gc();) |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5738 |
342 | 5739 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
johnc
parents:
10242
diff
changeset
|
5740 |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5741 // Disable the hot card cache. |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5742 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5743 hot_card_cache->reset_hot_cache_claimed_index(); |
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5744 hot_card_cache->set_use_cache(false); |
889 | 5745 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5746 uint n_workers; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5747 if (G1CollectedHeap::use_parallel_gc_threads()) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5748 n_workers = |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5749 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5750 workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5751 Threads::number_of_non_daemon_threads()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5752 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5753 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5754 "If not dynamic should be using all the workers"); |
4711 | 5755 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5756 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5757 } else { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5758 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5759 "Should be the original non-parallel value"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5760 n_workers = 1; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5761 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5762 |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5763 G1ParTask g1_par_task(this, _task_queues); |
342 | 5764 |
5765 init_for_evac_failure(NULL); | |
5766 | |
5767 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
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|
5768 |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
5769 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
|
5770 double start_par_time_sec = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5771 double end_par_time_sec; |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5772 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
5773 { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5774 StrongRootsScope srs(this); |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5775 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5776 if (G1CollectedHeap::use_parallel_gc_threads()) { |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5777 // 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
|
5778 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5779 // These tasks use ShareHeap::_process_strong_tasks |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5780 assert(UseDynamicNumberOfGCThreads || |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5781 workers()->active_workers() == workers()->total_workers(), |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5782 "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
|
5783 workers()->run_task(&g1_par_task); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5784 } else { |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5785 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
|
5786 g1_par_task.work(0); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5787 } |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5788 end_par_time_sec = os::elapsedTime(); |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5789 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5790 // 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
|
5791 // 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
|
5792 // 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
|
5793 // 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
|
5794 // reported parallel time. |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5795 } |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5796 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5797 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
|
5798 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
|
5799 |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5800 double code_root_fixup_time_ms = |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5801 (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
|
5802 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
|
5803 |
342 | 5804 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5805 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5806 // Process any discovered reference objects - we have |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5807 // to do this _before_ we retire the GC alloc regions |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5808 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5809 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5810 // not copied during the pause. |
6819 | 5811 process_discovered_references(n_workers); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5812 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5813 // Weak root processing. |
342 | 5814 { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5815 G1STWIsAliveClosure is_alive(this); |
342 | 5816 G1KeepAliveClosure keep_alive(this); |
5817 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5818 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5819 |
10405 | 5820 release_gc_alloc_regions(n_workers, evacuation_info); |
342 | 5821 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
|
5822 |
10246
194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents:
10242
diff
changeset
|
5823 // 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
|
5824 // 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
|
5825 // 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
|
5826 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
|
5827 hot_card_cache->set_use_cache(true); |
342 | 5828 |
12080 | 5829 // Migrate the strong code roots attached to each region in |
5830 // the collection set. Ideally we would like to do this | |
5831 // after we have finished the scanning/evacuation of the | |
5832 // strong code roots for a particular heap region. | |
5833 migrate_strong_code_roots(); | |
5834 | |
5835 if (g1_policy()->during_initial_mark_pause()) { | |
5836 // Reset the claim values set during marking the strong code roots | |
5837 reset_heap_region_claim_values(); | |
5838 } | |
5839 | |
342 | 5840 finalize_for_evac_failure(); |
5841 | |
5842 if (evacuation_failed()) { | |
5843 remove_self_forwarding_pointers(); | |
6629
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5844 |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5845 // Reset the G1EvacuationFailureALot counters and flags |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5846 // 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
|
5847 // evacuation failure occurs. |
c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
johnc
parents:
6628
diff
changeset
|
5848 NOT_PRODUCT(reset_evacuation_should_fail();) |
342 | 5849 } |
5850 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5851 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5852 // reference processor's discovered lists. We need to do |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5853 // this after the card table is cleaned (and verified) as |
10405 | 5854 // the act of enqueueing entries on to the pending list |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5855 // will log these updates (and dirty their associated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5856 // cards). We need these updates logged to update any |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5857 // RSets. |
6819 | 5858 enqueue_discovered_references(n_workers); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5859 |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5860 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5861 RedirtyLoggedCardTableEntryFastClosure redirty; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5862 dirty_card_queue_set().set_closure(&redirty); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5863 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5864 |
5865 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5866 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5867 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5868 } |
342 | 5869 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5870 } | |
5871 | |
2173 | 5872 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5873 size_t* pre_used, |
5874 FreeRegionList* free_list, | |
4072 | 5875 OldRegionSet* old_proxy_set, |
2152 | 5876 HumongousRegionSet* humongous_proxy_set, |
2173 | 5877 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5878 bool par) { |
5879 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5880 if (hr->isHumongous()) { | |
5881 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5882 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5883 } else { | |
4072 | 5884 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5885 free_region(hr, pre_used, free_list, par); |
342 | 5886 } |
2173 | 5887 } else { |
5888 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5889 } |
5890 } | |
5891 | |
2152 | 5892 void G1CollectedHeap::free_region(HeapRegion* hr, |
5893 size_t* pre_used, | |
5894 FreeRegionList* free_list, | |
5895 bool par) { | |
5896 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5897 assert(!hr->is_empty(), "the region should not be empty"); | |
5898 assert(free_list != NULL, "pre-condition"); | |
5899 | |
10246
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|
5900 // Clear the card counts for this region. |
194f52aa2f23
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|
5901 // Note: we only need to do this if the region is not young |
194f52aa2f23
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|
5902 // (since we don't refine cards in young regions). |
194f52aa2f23
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|
5903 if (!hr->is_young()) { |
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|
5904 _cg1r->hot_card_cache()->reset_card_counts(hr); |
194f52aa2f23
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|
5905 } |
2152 | 5906 *pre_used += hr->used(); |
5907 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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|
5908 free_list->add_as_head(hr); |
2152 | 5909 } |
5910 | |
5911 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5912 size_t* pre_used, | |
5913 FreeRegionList* free_list, | |
5914 HumongousRegionSet* humongous_proxy_set, | |
5915 bool par) { | |
5916 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5917 assert(free_list != NULL, "pre-condition"); | |
5918 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5919 | |
5920 size_t hr_used = hr->used(); | |
5921 size_t hr_capacity = hr->capacity(); | |
5922 size_t hr_pre_used = 0; | |
5923 _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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5924 // We need to read this before we make the region non-humongous, |
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|
5925 // otherwise the information will be gone. |
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|
5926 uint last_index = hr->last_hc_index(); |
2152 | 5927 hr->set_notHumongous(); |
5928 free_region(hr, &hr_pre_used, free_list, par); | |
5929 | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
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changeset
|
5930 uint i = hr->hrs_index() + 1; |
6254
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5931 while (i < last_index) { |
3766 | 5932 HeapRegion* curr_hr = region_at(i); |
6254
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|
5933 assert(curr_hr->continuesHumongous(), "invariant"); |
2152 | 5934 curr_hr->set_notHumongous(); |
5935 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5936 i += 1; | |
5937 } | |
5938 assert(hr_pre_used == hr_used, | |
5939 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5940 "should be the same", hr_pre_used, hr_used)); | |
5941 *pre_used += hr_pre_used; | |
5942 } | |
5943 | |
5944 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5945 FreeRegionList* free_list, | |
4072 | 5946 OldRegionSet* old_proxy_set, |
2152 | 5947 HumongousRegionSet* humongous_proxy_set, |
5948 bool par) { | |
5949 if (pre_used > 0) { | |
5950 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5951 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5952 assert(_summary_bytes_used >= pre_used, |
5953 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5954 "should be >= pre_used: "SIZE_FORMAT, | |
5955 _summary_bytes_used, pre_used)); | |
342 | 5956 _summary_bytes_used -= pre_used; |
2152 | 5957 } |
5958 if (free_list != NULL && !free_list->is_empty()) { | |
5959 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
2432
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|
5960 _free_list.add_as_head(free_list); |
2152 | 5961 } |
4072 | 5962 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5963 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5964 _old_set.update_from_proxy(old_proxy_set); | |
5965 } | |
2152 | 5966 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5967 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5968 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5969 } |
5970 } | |
5971 | |
796
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|
5972 class G1ParCleanupCTTask : public AbstractGangTask { |
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|
5973 CardTableModRefBS* _ct_bs; |
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5974 G1CollectedHeap* _g1h; |
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5975 HeapRegion* volatile _su_head; |
796
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|
5976 public: |
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|
5977 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5978 G1CollectedHeap* g1h) : |
796
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|
5979 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
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|
5980 _ct_bs(ct_bs), _g1h(g1h) { } |
796
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|
5981 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
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|
5982 void work(uint worker_id) { |
796
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|
5983 HeapRegion* r; |
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|
5984 while (r = _g1h->pop_dirty_cards_region()) { |
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|
5985 clear_cards(r); |
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|
5986 } |
940
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|
5987 } |
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|
5988 |
796
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|
5989 void clear_cards(HeapRegion* r) { |
3830
f44782f04dd4
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diff
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|
5990 // Cards of the survivors should have already been dirtied. |
1394
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|
5991 if (!r->is_survivor()) { |
796
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|
5992 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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|
5993 } |
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diff
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|
5994 } |
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diff
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|
5995 }; |
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diff
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|
5996 |
940
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|
5997 #ifndef PRODUCT |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
5998 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
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changeset
|
5999 G1CollectedHeap* _g1h; |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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diff
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|
6000 CardTableModRefBS* _ct_bs; |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
6001 public: |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
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|
6002 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
6003 : _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
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|
6004 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
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|
6005 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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|
6006 _g1h->verify_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
6007 } else { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
6008 _g1h->verify_not_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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936
diff
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|
6009 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
6010 return false; |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
6011 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
6012 }; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
6013 |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6014 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
6015 // All of the region should be clean. |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
6016 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
6017 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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changeset
|
6018 ct_bs->verify_not_dirty_region(mr); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
6019 } |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6020 |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6021 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6022 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6023 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
6024 // retires each region and replaces it with a new one will do a |
063382f9b575
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|
6025 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
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|
6026 // not dirty that area (one less thing to have to do while holding |
063382f9b575
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|
6027 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
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|
6028 // is dirty. |
063382f9b575
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diff
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|
6029 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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|
6030 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
063382f9b575
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|
6031 ct_bs->verify_dirty_region(mr); |
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|
6032 } |
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|
6033 |
2433
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|
6034 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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|
6035 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
2433
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|
6036 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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|
6037 verify_dirty_region(hr); |
2433
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|
6038 } |
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|
6039 } |
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|
6040 |
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diff
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|
6041 void G1CollectedHeap::verify_dirty_young_regions() { |
abdfc822206f
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2432
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|
6042 verify_dirty_young_list(_young_list->first_region()); |
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|
6043 } |
940
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|
6044 #endif |
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|
6045 |
342 | 6046 void G1CollectedHeap::cleanUpCardTable() { |
6047 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
6048 double start = os::elapsedTime(); | |
6049 | |
4023 | 6050 { |
6051 // Iterate over the dirty cards region list. | |
6052 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
6053 | |
4711 | 6054 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6055 set_par_threads(); | |
4023 | 6056 workers()->run_task(&cleanup_task); |
6057 set_par_threads(0); | |
6058 } else { | |
6059 while (_dirty_cards_region_list) { | |
6060 HeapRegion* r = _dirty_cards_region_list; | |
6061 cleanup_task.clear_cards(r); | |
6062 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
6063 if (_dirty_cards_region_list == r) { | |
6064 // The last region. | |
6065 _dirty_cards_region_list = NULL; | |
6066 } | |
6067 r->set_next_dirty_cards_region(NULL); | |
796
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|
6068 } |
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|
6069 } |
4023 | 6070 #ifndef PRODUCT |
6071 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
6072 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
6073 heap_region_iterate(&cleanup_verifier); | |
6074 } | |
6075 #endif | |
940
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|
6076 } |
1394
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|
6077 |
342 | 6078 double elapsed = os::elapsedTime() - start; |
6219
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6079 g1_policy()->phase_times()->record_clear_ct_time(elapsed * 1000.0); |
342 | 6080 } |
6081 | |
10405 | 6082 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info) { |
2152 | 6083 size_t pre_used = 0; |
6084 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
6085 | |
342 | 6086 double young_time_ms = 0.0; |
6087 double non_young_time_ms = 0.0; | |
6088 | |
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6089 // Since the collection set is a superset of the the young list, |
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6090 // all we need to do to clear the young list is clear its |
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6091 // head and length, and unlink any young regions in the code below |
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6092 _young_list->clear(); |
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6093 |
342 | 6094 G1CollectorPolicy* policy = g1_policy(); |
6095 | |
6096 double start_sec = os::elapsedTime(); | |
6097 bool non_young = true; | |
6098 | |
6099 HeapRegion* cur = cs_head; | |
6100 int age_bound = -1; | |
6101 size_t rs_lengths = 0; | |
6102 | |
6103 while (cur != NULL) { | |
2361 | 6104 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 6105 if (non_young) { |
6106 if (cur->is_young()) { | |
6107 double end_sec = os::elapsedTime(); | |
6108 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
6109 non_young_time_ms += elapsed_ms; | |
6110 | |
6111 start_sec = os::elapsedTime(); | |
6112 non_young = false; | |
6113 } | |
6114 } else { | |
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6115 if (!cur->is_young()) { |
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6116 double end_sec = os::elapsedTime(); |
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6117 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
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6118 young_time_ms += elapsed_ms; |
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6119 |
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6120 start_sec = os::elapsedTime(); |
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6121 non_young = true; |
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6122 } |
342 | 6123 } |
6124 | |
6125 rs_lengths += cur->rem_set()->occupied(); | |
6126 | |
6127 HeapRegion* next = cur->next_in_collection_set(); | |
6128 assert(cur->in_collection_set(), "bad CS"); | |
6129 cur->set_next_in_collection_set(NULL); | |
6130 cur->set_in_collection_set(false); | |
6131 | |
6132 if (cur->is_young()) { | |
6133 int index = cur->young_index_in_cset(); | |
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6134 assert(index != -1, "invariant"); |
6010
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6135 assert((uint) index < policy->young_cset_region_length(), "invariant"); |
342 | 6136 size_t words_survived = _surviving_young_words[index]; |
6137 cur->record_surv_words_in_group(words_survived); | |
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6138 |
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6139 // At this point the we have 'popped' cur from the collection set |
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6140 // (linked via next_in_collection_set()) but it is still in the |
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6141 // young list (linked via next_young_region()). Clear the |
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6142 // _next_young_region field. |
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6143 cur->set_next_young_region(NULL); |
342 | 6144 } else { |
6145 int index = cur->young_index_in_cset(); | |
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6146 assert(index == -1, "invariant"); |
342 | 6147 } |
6148 | |
6149 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
6150 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
6151 "invariant" ); | |
6152 | |
6153 if (!cur->evacuation_failed()) { | |
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6154 MemRegion used_mr = cur->used_region(); |
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6155 |
342 | 6156 // And the region is empty. |
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6157 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
2152 | 6158 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 6159 } else { |
6160 cur->uninstall_surv_rate_group(); | |
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6161 if (cur->is_young()) { |
342 | 6162 cur->set_young_index_in_cset(-1); |
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6163 } |
342 | 6164 cur->set_not_young(); |
6165 cur->set_evacuation_failed(false); | |
4072 | 6166 // The region is now considered to be old. |
6167 _old_set.add(cur); | |
10405 | 6168 evacuation_info.increment_collectionset_used_after(cur->used()); |
342 | 6169 } |
6170 cur = next; | |
6171 } | |
6172 | |
10405 | 6173 evacuation_info.set_regions_freed(local_free_list.length()); |
342 | 6174 policy->record_max_rs_lengths(rs_lengths); |
6175 policy->cset_regions_freed(); | |
6176 | |
6177 double end_sec = os::elapsedTime(); | |
6178 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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6179 |
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6180 if (non_young) { |
342 | 6181 non_young_time_ms += elapsed_ms; |
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6182 } else { |
342 | 6183 young_time_ms += elapsed_ms; |
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6184 } |
342 | 6185 |
2152 | 6186 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 6187 NULL /* old_proxy_set */, |
2152 | 6188 NULL /* humongous_proxy_set */, |
6189 false /* par */); | |
6219
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6190 policy->phase_times()->record_young_free_cset_time_ms(young_time_ms); |
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6191 policy->phase_times()->record_non_young_free_cset_time_ms(non_young_time_ms); |
342 | 6192 } |
6193 | |
1394
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6194 // This routine is similar to the above but does not record |
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6195 // any policy statistics or update free lists; we are abandoning |
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6196 // the current incremental collection set in preparation of a |
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6197 // full collection. After the full GC we will start to build up |
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6198 // the incremental collection set again. |
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6199 // This is only called when we're doing a full collection |
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6200 // and is immediately followed by the tearing down of the young list. |
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6201 |
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|
6202 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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6203 HeapRegion* cur = cs_head; |
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|
6204 |
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|
6205 while (cur != NULL) { |
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6206 HeapRegion* next = cur->next_in_collection_set(); |
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|
6207 assert(cur->in_collection_set(), "bad CS"); |
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6208 cur->set_next_in_collection_set(NULL); |
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|
6209 cur->set_in_collection_set(false); |
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|
6210 cur->set_young_index_in_cset(-1); |
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|
6211 cur = next; |
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|
6212 } |
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|
6213 } |
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|
6214 |
2152 | 6215 void G1CollectedHeap::set_free_regions_coming() { |
6216 if (G1ConcRegionFreeingVerbose) { | |
6217 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
6218 "setting free regions coming"); | |
6219 } | |
6220 | |
6221 assert(!free_regions_coming(), "pre-condition"); | |
6222 _free_regions_coming = true; | |
342 | 6223 } |
6224 | |
2152 | 6225 void G1CollectedHeap::reset_free_regions_coming() { |
4837
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|
6226 assert(free_regions_coming(), "pre-condition"); |
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6227 |
2152 | 6228 { |
6229 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6230 _free_regions_coming = false; | |
6231 SecondaryFreeList_lock->notify_all(); | |
6232 } | |
6233 | |
6234 if (G1ConcRegionFreeingVerbose) { | |
6235 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
6236 "reset free regions coming"); | |
342 | 6237 } |
6238 } | |
6239 | |
2152 | 6240 void G1CollectedHeap::wait_while_free_regions_coming() { |
6241 // Most of the time we won't have to wait, so let's do a quick test | |
6242 // first before we take the lock. | |
6243 if (!free_regions_coming()) { | |
6244 return; | |
6245 } | |
6246 | |
6247 if (G1ConcRegionFreeingVerbose) { | |
6248 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
6249 "waiting for free regions"); | |
342 | 6250 } |
6251 | |
6252 { | |
2152 | 6253 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
6254 while (free_regions_coming()) { | |
6255 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 6256 } |
2152 | 6257 } |
6258 | |
6259 if (G1ConcRegionFreeingVerbose) { | |
6260 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
6261 "done waiting for free regions"); | |
6262 } | |
342 | 6263 } |
6264 | |
6265 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
6266 assert(heap_lock_held_for_gc(), | |
6267 "the heap lock should already be held by or for this thread"); | |
6268 _young_list->push_region(hr); | |
6269 } | |
6270 | |
6271 class NoYoungRegionsClosure: public HeapRegionClosure { | |
6272 private: | |
6273 bool _success; | |
6274 public: | |
6275 NoYoungRegionsClosure() : _success(true) { } | |
6276 bool doHeapRegion(HeapRegion* r) { | |
6277 if (r->is_young()) { | |
6278 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
6279 r->bottom(), r->end()); | |
6280 _success = false; | |
6281 } | |
6282 return false; | |
6283 } | |
6284 bool success() { return _success; } | |
6285 }; | |
6286 | |
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6287 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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6288 bool ret = _young_list->check_list_empty(check_sample); |
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6289 |
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6290 if (check_heap) { |
342 | 6291 NoYoungRegionsClosure closure; |
6292 heap_region_iterate(&closure); | |
6293 ret = ret && closure.success(); | |
6294 } | |
6295 | |
6296 return ret; | |
6297 } | |
6298 | |
4072 | 6299 class TearDownRegionSetsClosure : public HeapRegionClosure { |
6300 private: | |
6301 OldRegionSet *_old_set; | |
2152 | 6302 |
342 | 6303 public: |
4072 | 6304 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 6305 |
342 | 6306 bool doHeapRegion(HeapRegion* r) { |
4072 | 6307 if (r->is_empty()) { |
6308 // We ignore empty regions, we'll empty the free list afterwards | |
6309 } else if (r->is_young()) { | |
6310 // We ignore young regions, we'll empty the young list afterwards | |
6311 } else if (r->isHumongous()) { | |
6312 // We ignore humongous regions, we're not tearing down the | |
6313 // humongous region set | |
342 | 6314 } else { |
4072 | 6315 // The rest should be old |
6316 _old_set->remove(r); | |
342 | 6317 } |
6318 return false; | |
6319 } | |
6320 | |
4072 | 6321 ~TearDownRegionSetsClosure() { |
6322 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 6323 } |
342 | 6324 }; |
6325 | |
4072 | 6326 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
6327 assert_at_safepoint(true /* should_be_vm_thread */); | |
6328 | |
6329 if (!free_list_only) { | |
6330 TearDownRegionSetsClosure cl(&_old_set); | |
6331 heap_region_iterate(&cl); | |
6332 | |
6333 // Need to do this after the heap iteration to be able to | |
6334 // recognize the young regions and ignore them during the iteration. | |
6335 _young_list->empty_list(); | |
6336 } | |
6337 _free_list.remove_all(); | |
6338 } | |
6339 | |
6340 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
6341 private: | |
6342 bool _free_list_only; | |
6343 OldRegionSet* _old_set; | |
6344 FreeRegionList* _free_list; | |
6345 size_t _total_used; | |
6346 | |
6347 public: | |
6348 RebuildRegionSetsClosure(bool free_list_only, | |
6349 OldRegionSet* old_set, FreeRegionList* free_list) : | |
6350 _free_list_only(free_list_only), | |
6351 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
6352 assert(_free_list->is_empty(), "pre-condition"); | |
6353 if (!free_list_only) { | |
6354 assert(_old_set->is_empty(), "pre-condition"); | |
6355 } | |
6356 } | |
6357 | |
6358 bool doHeapRegion(HeapRegion* r) { | |
6359 if (r->continuesHumongous()) { | |
6360 return false; | |
6361 } | |
6362 | |
6363 if (r->is_empty()) { | |
6364 // Add free regions to the free list | |
6365 _free_list->add_as_tail(r); | |
6366 } else if (!_free_list_only) { | |
6367 assert(!r->is_young(), "we should not come across young regions"); | |
6368 | |
6369 if (r->isHumongous()) { | |
6370 // We ignore humongous regions, we left the humongous set unchanged | |
6371 } else { | |
6372 // The rest should be old, add them to the old set | |
6373 _old_set->add(r); | |
6374 } | |
6375 _total_used += r->used(); | |
6376 } | |
6377 | |
6378 return false; | |
6379 } | |
6380 | |
6381 size_t total_used() { | |
6382 return _total_used; | |
6383 } | |
6384 }; | |
6385 | |
6386 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
6387 assert_at_safepoint(true /* should_be_vm_thread */); | |
6388 | |
6389 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
6390 heap_region_iterate(&cl); | |
6391 | |
6392 if (!free_list_only) { | |
6393 _summary_bytes_used = cl.total_used(); | |
6394 } | |
6395 assert(_summary_bytes_used == recalculate_used(), | |
6396 err_msg("inconsistent _summary_bytes_used, " | |
6397 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
6398 _summary_bytes_used, recalculate_used())); | |
342 | 6399 } |
6400 | |
6401 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
6402 _refine_cte_cl->set_concurrent(concurrent); | |
6403 } | |
6404 | |
6405 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
6406 HeapRegion* hr = heap_region_containing(p); | |
6407 if (hr == NULL) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
6408 return false; |
342 | 6409 } else { |
6410 return hr->is_in(p); | |
6411 } | |
6412 } | |
2152 | 6413 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6414 // Methods for the mutator alloc region |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6415 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6416 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6417 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6418 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6419 assert(!force || g1_policy()->can_expand_young_list(), |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6420 "if force is true we should be able to expand the young list"); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6421 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6422 if (force || !young_list_full) { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6423 HeapRegion* new_alloc_region = new_region(word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6424 false /* do_expand */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6425 if (new_alloc_region != NULL) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6426 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6427 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6428 return new_alloc_region; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6429 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6430 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6431 return NULL; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6432 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6433 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6434 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6435 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6436 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6437 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6438 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6439 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6440 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6441 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6442 // We update the eden sizes here, when the region is retired, |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6443 // instead of when it's allocated, since this is the point that its |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6444 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6445 g1mm()->update_eden_size(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6446 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6447 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6448 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6449 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6450 return _g1h->new_mutator_alloc_region(word_size, force); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6451 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6452 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6453 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6454 // Don't change the number of workers. Use the value previously set |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6455 // in the workgroup. |
4711 | 6456 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
|
6457 uint n_workers = workers()->active_workers(); |
4711 | 6458 assert(UseDynamicNumberOfGCThreads || |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6459 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6460 "Otherwise should be using the total number of workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6461 if (n_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6462 assert(false, "Should have been set in prior evacuation pause."); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6463 n_workers = ParallelGCThreads; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6464 workers()->set_active_workers(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6465 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6466 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6467 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6468 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6469 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6470 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6471 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6472 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6473 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6474 // Methods for the GC alloc regions |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6475 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6476 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
6477 uint count, |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6478 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6479 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6480 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6481 if (count < g1_policy()->max_regions(ap)) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6482 HeapRegion* new_alloc_region = new_region(word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6483 true /* do_expand */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6484 if (new_alloc_region != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6485 // We really only need to do this for old regions given that we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6486 // should never scan survivors. But it doesn't hurt to do it |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6487 // for survivors too. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6488 new_alloc_region->set_saved_mark(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6489 if (ap == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6490 new_alloc_region->set_survivor(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6491 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6492 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6493 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6494 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6495 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6496 new_alloc_region->note_start_of_copying(during_im); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6497 return new_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6498 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6499 g1_policy()->note_alloc_region_limit_reached(ap); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6500 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6501 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6502 return NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6503 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6504 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6505 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6506 size_t allocated_bytes, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6507 GCAllocPurpose ap) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6508 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6509 alloc_region->note_end_of_copying(during_im); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6510 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6511 if (ap == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6512 young_list()->add_survivor_region(alloc_region); |
4072 | 6513 } else { |
6514 _old_set.add(alloc_region); | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6515 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6516 _hr_printer.retire(alloc_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6517 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6518 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6519 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6520 bool force) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6521 assert(!force, "not supported for GC alloc regions"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6522 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6523 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6524 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6525 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6526 size_t allocated_bytes) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6527 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6528 GCAllocForSurvived); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6529 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6530 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6531 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6532 bool force) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6533 assert(!force, "not supported for GC alloc regions"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6534 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6535 } |
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6536 |
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6537 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6538 size_t allocated_bytes) { |
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6539 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6540 GCAllocForTenured); |
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6541 } |
2433
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6542 // Heap region set verification |
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6543 |
2152 | 6544 class VerifyRegionListsClosure : public HeapRegionClosure { |
6545 private: | |
4072 | 6546 FreeRegionList* _free_list; |
6547 OldRegionSet* _old_set; | |
2152 | 6548 HumongousRegionSet* _humongous_set; |
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6549 uint _region_count; |
2152 | 6550 |
6551 public: | |
4072 | 6552 VerifyRegionListsClosure(OldRegionSet* old_set, |
6553 HumongousRegionSet* humongous_set, | |
2152 | 6554 FreeRegionList* free_list) : |
4072 | 6555 _old_set(old_set), _humongous_set(humongous_set), |
6556 _free_list(free_list), _region_count(0) { } | |
2152 | 6557 |
6010
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6558 uint region_count() { return _region_count; } |
2152 | 6559 |
6560 bool doHeapRegion(HeapRegion* hr) { | |
6561 _region_count += 1; | |
6562 | |
6563 if (hr->continuesHumongous()) { | |
6564 return false; | |
6565 } | |
6566 | |
6567 if (hr->is_young()) { | |
6568 // TODO | |
6569 } else if (hr->startsHumongous()) { | |
6570 _humongous_set->verify_next_region(hr); | |
6571 } else if (hr->is_empty()) { | |
6572 _free_list->verify_next_region(hr); | |
4072 | 6573 } else { |
6574 _old_set->verify_next_region(hr); | |
2152 | 6575 } |
6576 return false; | |
6577 } | |
6578 }; | |
6579 | |
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6580 HeapRegion* G1CollectedHeap::new_heap_region(uint hrs_index, |
3766 | 6581 HeapWord* bottom) { |
6582 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6583 MemRegion mr(bottom, end); | |
6584 assert(_g1_reserved.contains(mr), "invariant"); | |
6585 // This might return NULL if the allocation fails | |
6754
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6586 return new HeapRegion(hrs_index, _bot_shared, mr); |
3766 | 6587 } |
6588 | |
2152 | 6589 void G1CollectedHeap::verify_region_sets() { |
6590 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6591 | |
6592 // First, check the explicit lists. | |
6593 _free_list.verify(); | |
6594 { | |
6595 // Given that a concurrent operation might be adding regions to | |
6596 // the secondary free list we have to take the lock before | |
6597 // verifying it. | |
6598 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6599 _secondary_free_list.verify(); | |
6600 } | |
4072 | 6601 _old_set.verify(); |
2152 | 6602 _humongous_set.verify(); |
6603 | |
6604 // If a concurrent region freeing operation is in progress it will | |
6605 // be difficult to correctly attributed any free regions we come | |
6606 // across to the correct free list given that they might belong to | |
6607 // one of several (free_list, secondary_free_list, any local lists, | |
6608 // etc.). So, if that's the case we will skip the rest of the | |
6609 // verification operation. Alternatively, waiting for the concurrent | |
6610 // operation to complete will have a non-trivial effect on the GC's | |
6611 // operation (no concurrent operation will last longer than the | |
6612 // interval between two calls to verification) and it might hide | |
6613 // any issues that we would like to catch during testing. | |
6614 if (free_regions_coming()) { | |
6615 return; | |
6616 } | |
6617 | |
2361 | 6618 // Make sure we append the secondary_free_list on the free_list so |
6619 // that all free regions we will come across can be safely | |
6620 // attributed to the free_list. | |
6621 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6622 |
6623 // Finally, make sure that the region accounting in the lists is | |
6624 // consistent with what we see in the heap. | |
4072 | 6625 _old_set.verify_start(); |
2152 | 6626 _humongous_set.verify_start(); |
6627 _free_list.verify_start(); | |
6628 | |
4072 | 6629 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6630 heap_region_iterate(&cl); |
6631 | |
4072 | 6632 _old_set.verify_end(); |
2152 | 6633 _humongous_set.verify_end(); |
6634 _free_list.verify_end(); | |
342 | 6635 } |
12080 | 6636 |
6637 // Optimized nmethod scanning | |
6638 | |
6639 class RegisterNMethodOopClosure: public OopClosure { | |
6640 G1CollectedHeap* _g1h; | |
6641 nmethod* _nm; | |
6642 | |
6643 template <class T> void do_oop_work(T* p) { | |
6644 T heap_oop = oopDesc::load_heap_oop(p); | |
6645 if (!oopDesc::is_null(heap_oop)) { | |
6646 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6647 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
6648 assert(!hr->isHumongous(), "code root in humongous region?"); | |
6649 | |
6650 // HeapRegion::add_strong_code_root() avoids adding duplicate | |
6651 // entries but having duplicates is OK since we "mark" nmethods | |
6652 // as visited when we scan the strong code root lists during the GC. | |
6653 hr->add_strong_code_root(_nm); | |
6654 assert(hr->rem_set()->strong_code_roots_list_contains(_nm), "add failed?"); | |
6655 } | |
6656 } | |
6657 | |
6658 public: | |
6659 RegisterNMethodOopClosure(G1CollectedHeap* g1h, nmethod* nm) : | |
6660 _g1h(g1h), _nm(nm) {} | |
6661 | |
6662 void do_oop(oop* p) { do_oop_work(p); } | |
6663 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6664 }; | |
6665 | |
6666 class UnregisterNMethodOopClosure: public OopClosure { | |
6667 G1CollectedHeap* _g1h; | |
6668 nmethod* _nm; | |
6669 | |
6670 template <class T> void do_oop_work(T* p) { | |
6671 T heap_oop = oopDesc::load_heap_oop(p); | |
6672 if (!oopDesc::is_null(heap_oop)) { | |
6673 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6674 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
6675 assert(!hr->isHumongous(), "code root in humongous region?"); | |
6676 hr->remove_strong_code_root(_nm); | |
6677 assert(!hr->rem_set()->strong_code_roots_list_contains(_nm), "remove failed?"); | |
6678 } | |
6679 } | |
6680 | |
6681 public: | |
6682 UnregisterNMethodOopClosure(G1CollectedHeap* g1h, nmethod* nm) : | |
6683 _g1h(g1h), _nm(nm) {} | |
6684 | |
6685 void do_oop(oop* p) { do_oop_work(p); } | |
6686 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6687 }; | |
6688 | |
6689 void G1CollectedHeap::register_nmethod(nmethod* nm) { | |
6690 CollectedHeap::register_nmethod(nm); | |
6691 | |
6692 guarantee(nm != NULL, "sanity"); | |
6693 RegisterNMethodOopClosure reg_cl(this, nm); | |
6694 nm->oops_do(®_cl); | |
6695 } | |
6696 | |
6697 void G1CollectedHeap::unregister_nmethod(nmethod* nm) { | |
6698 CollectedHeap::unregister_nmethod(nm); | |
6699 | |
6700 guarantee(nm != NULL, "sanity"); | |
6701 UnregisterNMethodOopClosure reg_cl(this, nm); | |
6702 nm->oops_do(®_cl, true); | |
6703 } | |
6704 | |
6705 class MigrateCodeRootsHeapRegionClosure: public HeapRegionClosure { | |
6706 public: | |
6707 bool doHeapRegion(HeapRegion *hr) { | |
6708 assert(!hr->isHumongous(), "humongous region in collection set?"); | |
6709 hr->migrate_strong_code_roots(); | |
6710 return false; | |
6711 } | |
6712 }; | |
6713 | |
6714 void G1CollectedHeap::migrate_strong_code_roots() { | |
6715 MigrateCodeRootsHeapRegionClosure cl; | |
6716 double migrate_start = os::elapsedTime(); | |
6717 collection_set_iterate(&cl); | |
6718 double migration_time_ms = (os::elapsedTime() - migrate_start) * 1000.0; | |
6719 g1_policy()->phase_times()->record_strong_code_root_migration_time(migration_time_ms); | |
6720 } | |
6721 | |
6722 // Mark all the code roots that point into regions *not* in the | |
6723 // collection set. | |
6724 // | |
6725 // Note we do not want to use a "marking" CodeBlobToOopClosure while | |
6726 // walking the the code roots lists of regions not in the collection | |
6727 // set. Suppose we have an nmethod (M) that points to objects in two | |
6728 // separate regions - one in the collection set (R1) and one not (R2). | |
6729 // Using a "marking" CodeBlobToOopClosure here would result in "marking" | |
6730 // nmethod M when walking the code roots for R1. When we come to scan | |
6731 // the code roots for R2, we would see that M is already marked and it | |
6732 // would be skipped and the objects in R2 that are referenced from M | |
6733 // would not be evacuated. | |
6734 | |
6735 class MarkStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
6736 | |
6737 class MarkStrongCodeRootOopClosure: public OopClosure { | |
6738 ConcurrentMark* _cm; | |
6739 HeapRegion* _hr; | |
6740 uint _worker_id; | |
6741 | |
6742 template <class T> void do_oop_work(T* p) { | |
6743 T heap_oop = oopDesc::load_heap_oop(p); | |
6744 if (!oopDesc::is_null(heap_oop)) { | |
6745 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
6746 // Only mark objects in the region (which is assumed | |
6747 // to be not in the collection set). | |
6748 if (_hr->is_in(obj)) { | |
6749 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); | |
6750 } | |
6751 } | |
6752 } | |
6753 | |
6754 public: | |
6755 MarkStrongCodeRootOopClosure(ConcurrentMark* cm, HeapRegion* hr, uint worker_id) : | |
6756 _cm(cm), _hr(hr), _worker_id(worker_id) { | |
6757 assert(!_hr->in_collection_set(), "sanity"); | |
6758 } | |
6759 | |
6760 void do_oop(narrowOop* p) { do_oop_work(p); } | |
6761 void do_oop(oop* p) { do_oop_work(p); } | |
6762 }; | |
6763 | |
6764 MarkStrongCodeRootOopClosure _oop_cl; | |
6765 | |
6766 public: | |
6767 MarkStrongCodeRootCodeBlobClosure(ConcurrentMark* cm, HeapRegion* hr, uint worker_id): | |
6768 _oop_cl(cm, hr, worker_id) {} | |
6769 | |
6770 void do_code_blob(CodeBlob* cb) { | |
6771 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
6772 if (nm != NULL) { | |
6773 nm->oops_do(&_oop_cl); | |
6774 } | |
6775 } | |
6776 }; | |
6777 | |
6778 class MarkStrongCodeRootsHRClosure: public HeapRegionClosure { | |
6779 G1CollectedHeap* _g1h; | |
6780 uint _worker_id; | |
6781 | |
6782 public: | |
6783 MarkStrongCodeRootsHRClosure(G1CollectedHeap* g1h, uint worker_id) : | |
6784 _g1h(g1h), _worker_id(worker_id) {} | |
6785 | |
6786 bool doHeapRegion(HeapRegion *hr) { | |
6787 HeapRegionRemSet* hrrs = hr->rem_set(); | |
6788 if (hr->isHumongous()) { | |
6789 // Code roots should never be attached to a humongous region | |
6790 assert(hrrs->strong_code_roots_list_length() == 0, "sanity"); | |
6791 return false; | |
6792 } | |
6793 | |
6794 if (hr->in_collection_set()) { | |
6795 // Don't mark code roots into regions in the collection set here. | |
6796 // They will be marked when we scan them. | |
6797 return false; | |
6798 } | |
6799 | |
6800 MarkStrongCodeRootCodeBlobClosure cb_cl(_g1h->concurrent_mark(), hr, _worker_id); | |
6801 hr->strong_code_roots_do(&cb_cl); | |
6802 return false; | |
6803 } | |
6804 }; | |
6805 | |
6806 void G1CollectedHeap::mark_strong_code_roots(uint worker_id) { | |
6807 MarkStrongCodeRootsHRClosure cl(this, worker_id); | |
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6808 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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6809 heap_region_par_iterate_chunked(&cl, |
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6810 worker_id, |
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6811 workers()->active_workers(), |
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6812 HeapRegion::ParMarkRootClaimValue); |
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6813 } else { |
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6814 heap_region_iterate(&cl); |
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6815 } |
12080 | 6816 } |
6817 | |
6818 class RebuildStrongCodeRootClosure: public CodeBlobClosure { | |
6819 G1CollectedHeap* _g1h; | |
6820 | |
6821 public: | |
6822 RebuildStrongCodeRootClosure(G1CollectedHeap* g1h) : | |
6823 _g1h(g1h) {} | |
6824 | |
6825 void do_code_blob(CodeBlob* cb) { | |
6826 nmethod* nm = (cb != NULL) ? cb->as_nmethod_or_null() : NULL; | |
6827 if (nm == NULL) { | |
6828 return; | |
6829 } | |
6830 | |
6831 if (ScavengeRootsInCode && nm->detect_scavenge_root_oops()) { | |
6832 _g1h->register_nmethod(nm); | |
6833 } | |
6834 } | |
6835 }; | |
6836 | |
6837 void G1CollectedHeap::rebuild_strong_code_roots() { | |
6838 RebuildStrongCodeRootClosure blob_cl(this); | |
6839 CodeCache::blobs_do(&blob_cl); | |
6840 } |