Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4833:57025542827f
7131791: G1: Asserts in nightly testing due to 6976060
Summary: Create a handle and fake an object to make sure that we don't loose the memory we just allocated
Reviewed-by: tonyp, stefank
author | brutisso |
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date | Fri, 20 Jan 2012 18:01:32 +0100 |
parents | 7ca7be5a6a0b |
children | 6a78aa6ac1ff |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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35 #include "gc_implementation/g1/g1EvacFailure.hpp" |
1972 | 36 #include "gc_implementation/g1/g1MarkSweep.hpp" |
37 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
38 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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39 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 40 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
41 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
42 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
43 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
44 #include "memory/gcLocker.inline.hpp" | |
45 #include "memory/genOopClosures.inline.hpp" | |
46 #include "memory/generationSpec.hpp" | |
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47 #include "memory/referenceProcessor.hpp" |
1972 | 48 #include "oops/oop.inline.hpp" |
49 #include "oops/oop.pcgc.inline.hpp" | |
50 #include "runtime/aprofiler.hpp" | |
51 #include "runtime/vmThread.hpp" | |
342 | 52 |
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53 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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54 |
342 | 55 // turn it on so that the contents of the young list (scan-only / |
56 // to-be-collected) are printed at "strategic" points before / during | |
57 // / after the collection --- this is useful for debugging | |
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58 #define YOUNG_LIST_VERBOSE 0 |
342 | 59 // CURRENT STATUS |
60 // This file is under construction. Search for "FIXME". | |
61 | |
62 // INVARIANTS/NOTES | |
63 // | |
64 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 65 // serialized by acquiring the HeapLock. This happens in mem_allocate |
66 // and allocate_new_tlab, which are the "entry" points to the | |
67 // allocation code from the rest of the JVM. (Note that this does not | |
68 // apply to TLAB allocation, which is not part of this interface: it | |
69 // is done by clients of this interface.) | |
342 | 70 |
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71 // Notes on implementation of parallelism in different tasks. |
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72 // |
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73 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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74 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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75 // It does use run_task() which sets _n_workers in the task. |
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76 // G1ParTask executes g1_process_strong_roots() -> |
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77 // SharedHeap::process_strong_roots() which calls eventuall to |
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78 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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79 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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80 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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81 // |
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82 |
342 | 83 // Local to this file. |
84 | |
85 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
86 SuspendibleThreadSet* _sts; | |
87 G1RemSet* _g1rs; | |
88 ConcurrentG1Refine* _cg1r; | |
89 bool _concurrent; | |
90 public: | |
91 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
92 G1RemSet* g1rs, | |
93 ConcurrentG1Refine* cg1r) : | |
94 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
95 {} | |
96 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 97 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
98 // This path is executed by the concurrent refine or mutator threads, | |
99 // concurrently, and so we do not care if card_ptr contains references | |
100 // that point into the collection set. | |
101 assert(!oops_into_cset, "should be"); | |
102 | |
342 | 103 if (_concurrent && _sts->should_yield()) { |
104 // Caller will actually yield. | |
105 return false; | |
106 } | |
107 // Otherwise, we finished successfully; return true. | |
108 return true; | |
109 } | |
110 void set_concurrent(bool b) { _concurrent = b; } | |
111 }; | |
112 | |
113 | |
114 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
115 int _calls; | |
116 G1CollectedHeap* _g1h; | |
117 CardTableModRefBS* _ctbs; | |
118 int _histo[256]; | |
119 public: | |
120 ClearLoggedCardTableEntryClosure() : | |
121 _calls(0) | |
122 { | |
123 _g1h = G1CollectedHeap::heap(); | |
124 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
125 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
126 } | |
127 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
128 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
129 _calls++; | |
130 unsigned char* ujb = (unsigned char*)card_ptr; | |
131 int ind = (int)(*ujb); | |
132 _histo[ind]++; | |
133 *card_ptr = -1; | |
134 } | |
135 return true; | |
136 } | |
137 int calls() { return _calls; } | |
138 void print_histo() { | |
139 gclog_or_tty->print_cr("Card table value histogram:"); | |
140 for (int i = 0; i < 256; i++) { | |
141 if (_histo[i] != 0) { | |
142 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
143 } | |
144 } | |
145 } | |
146 }; | |
147 | |
148 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
149 int _calls; | |
150 G1CollectedHeap* _g1h; | |
151 CardTableModRefBS* _ctbs; | |
152 public: | |
153 RedirtyLoggedCardTableEntryClosure() : | |
154 _calls(0) | |
155 { | |
156 _g1h = G1CollectedHeap::heap(); | |
157 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
158 } | |
159 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
160 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
161 _calls++; | |
162 *card_ptr = 0; | |
163 } | |
164 return true; | |
165 } | |
166 int calls() { return _calls; } | |
167 }; | |
168 | |
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169 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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170 public: |
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171 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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172 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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173 return true; |
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174 } |
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175 }; |
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176 |
342 | 177 YoungList::YoungList(G1CollectedHeap* g1h) |
178 : _g1h(g1h), _head(NULL), | |
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179 _length(0), |
342 | 180 _last_sampled_rs_lengths(0), |
545 | 181 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 182 { |
183 guarantee( check_list_empty(false), "just making sure..." ); | |
184 } | |
185 | |
186 void YoungList::push_region(HeapRegion *hr) { | |
187 assert(!hr->is_young(), "should not already be young"); | |
188 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
189 | |
190 hr->set_next_young_region(_head); | |
191 _head = hr; | |
192 | |
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193 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 194 ++_length; |
195 } | |
196 | |
197 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 198 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 199 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
200 | |
201 hr->set_next_young_region(_survivor_head); | |
202 if (_survivor_head == NULL) { | |
545 | 203 _survivor_tail = hr; |
342 | 204 } |
205 _survivor_head = hr; | |
206 ++_survivor_length; | |
207 } | |
208 | |
209 void YoungList::empty_list(HeapRegion* list) { | |
210 while (list != NULL) { | |
211 HeapRegion* next = list->get_next_young_region(); | |
212 list->set_next_young_region(NULL); | |
213 list->uninstall_surv_rate_group(); | |
214 list->set_not_young(); | |
215 list = next; | |
216 } | |
217 } | |
218 | |
219 void YoungList::empty_list() { | |
220 assert(check_list_well_formed(), "young list should be well formed"); | |
221 | |
222 empty_list(_head); | |
223 _head = NULL; | |
224 _length = 0; | |
225 | |
226 empty_list(_survivor_head); | |
227 _survivor_head = NULL; | |
545 | 228 _survivor_tail = NULL; |
342 | 229 _survivor_length = 0; |
230 | |
231 _last_sampled_rs_lengths = 0; | |
232 | |
233 assert(check_list_empty(false), "just making sure..."); | |
234 } | |
235 | |
236 bool YoungList::check_list_well_formed() { | |
237 bool ret = true; | |
238 | |
239 size_t length = 0; | |
240 HeapRegion* curr = _head; | |
241 HeapRegion* last = NULL; | |
242 while (curr != NULL) { | |
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243 if (!curr->is_young()) { |
342 | 244 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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245 "incorrectly tagged (y: %d, surv: %d)", |
342 | 246 curr->bottom(), curr->end(), |
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247 curr->is_young(), curr->is_survivor()); |
342 | 248 ret = false; |
249 } | |
250 ++length; | |
251 last = curr; | |
252 curr = curr->get_next_young_region(); | |
253 } | |
254 ret = ret && (length == _length); | |
255 | |
256 if (!ret) { | |
257 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
258 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
259 length, _length); | |
260 } | |
261 | |
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262 return ret; |
342 | 263 } |
264 | |
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265 bool YoungList::check_list_empty(bool check_sample) { |
342 | 266 bool ret = true; |
267 | |
268 if (_length != 0) { | |
269 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
270 _length); | |
271 ret = false; | |
272 } | |
273 if (check_sample && _last_sampled_rs_lengths != 0) { | |
274 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
275 ret = false; | |
276 } | |
277 if (_head != NULL) { | |
278 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
279 ret = false; | |
280 } | |
281 if (!ret) { | |
282 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
283 } | |
284 | |
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285 return ret; |
342 | 286 } |
287 | |
288 void | |
289 YoungList::rs_length_sampling_init() { | |
290 _sampled_rs_lengths = 0; | |
291 _curr = _head; | |
292 } | |
293 | |
294 bool | |
295 YoungList::rs_length_sampling_more() { | |
296 return _curr != NULL; | |
297 } | |
298 | |
299 void | |
300 YoungList::rs_length_sampling_next() { | |
301 assert( _curr != NULL, "invariant" ); | |
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302 size_t rs_length = _curr->rem_set()->occupied(); |
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303 |
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304 _sampled_rs_lengths += rs_length; |
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305 |
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306 // The current region may not yet have been added to the |
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307 // incremental collection set (it gets added when it is |
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308 // retired as the current allocation region). |
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309 if (_curr->in_collection_set()) { |
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310 // Update the collection set policy information for this region |
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311 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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312 } |
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313 |
342 | 314 _curr = _curr->get_next_young_region(); |
315 if (_curr == NULL) { | |
316 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
317 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
318 } | |
319 } | |
320 | |
321 void | |
322 YoungList::reset_auxilary_lists() { | |
323 guarantee( is_empty(), "young list should be empty" ); | |
324 assert(check_list_well_formed(), "young list should be well formed"); | |
325 | |
326 // Add survivor regions to SurvRateGroup. | |
327 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 328 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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329 |
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330 int young_index_in_cset = 0; |
342 | 331 for (HeapRegion* curr = _survivor_head; |
332 curr != NULL; | |
333 curr = curr->get_next_young_region()) { | |
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334 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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335 |
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336 // The region is a non-empty survivor so let's add it to |
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337 // the incremental collection set for the next evacuation |
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338 // pause. |
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339 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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340 young_index_in_cset += 1; |
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341 } |
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342 assert((size_t) young_index_in_cset == _survivor_length, |
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343 "post-condition"); |
342 | 344 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
345 | |
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346 _head = _survivor_head; |
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347 _length = _survivor_length; |
342 | 348 if (_survivor_head != NULL) { |
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349 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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350 assert(_survivor_length > 0, "invariant"); |
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351 _survivor_tail->set_next_young_region(NULL); |
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352 } |
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353 |
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354 // Don't clear the survivor list handles until the start of |
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355 // the next evacuation pause - we need it in order to re-tag |
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356 // the survivor regions from this evacuation pause as 'young' |
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357 // at the start of the next. |
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358 |
545 | 359 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 360 |
361 assert(check_list_well_formed(), "young list should be well formed"); | |
362 } | |
363 | |
364 void YoungList::print() { | |
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365 HeapRegion* lists[] = {_head, _survivor_head}; |
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366 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 367 |
368 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
369 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
370 HeapRegion *curr = lists[list]; | |
371 if (curr == NULL) | |
372 gclog_or_tty->print_cr(" empty"); | |
373 while (curr != NULL) { | |
374 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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375 "age: %4d, y: %d, surv: %d", |
342 | 376 curr->bottom(), curr->end(), |
377 curr->top(), | |
378 curr->prev_top_at_mark_start(), | |
379 curr->next_top_at_mark_start(), | |
380 curr->top_at_conc_mark_count(), | |
381 curr->age_in_surv_rate_group_cond(), | |
382 curr->is_young(), | |
383 curr->is_survivor()); | |
384 curr = curr->get_next_young_region(); | |
385 } | |
386 } | |
387 | |
388 gclog_or_tty->print_cr(""); | |
389 } | |
390 | |
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391 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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392 { |
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393 // Claim the right to put the region on the dirty cards region list |
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394 // by installing a self pointer. |
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395 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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396 if (next == NULL) { |
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397 HeapRegion* res = (HeapRegion*) |
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398 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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399 NULL); |
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400 if (res == NULL) { |
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401 HeapRegion* head; |
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402 do { |
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403 // Put the region to the dirty cards region list. |
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404 head = _dirty_cards_region_list; |
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405 next = (HeapRegion*) |
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406 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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407 if (next == head) { |
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408 assert(hr->get_next_dirty_cards_region() == hr, |
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409 "hr->get_next_dirty_cards_region() != hr"); |
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410 if (next == NULL) { |
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411 // The last region in the list points to itself. |
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412 hr->set_next_dirty_cards_region(hr); |
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413 } else { |
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414 hr->set_next_dirty_cards_region(next); |
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415 } |
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416 } |
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417 } while (next != head); |
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418 } |
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419 } |
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420 } |
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421 |
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422 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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423 { |
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424 HeapRegion* head; |
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425 HeapRegion* hr; |
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426 do { |
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427 head = _dirty_cards_region_list; |
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428 if (head == NULL) { |
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429 return NULL; |
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430 } |
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431 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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432 if (head == new_head) { |
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433 // The last region. |
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434 new_head = NULL; |
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435 } |
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436 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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437 head); |
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438 } while (hr != head); |
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439 assert(hr != NULL, "invariant"); |
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440 hr->set_next_dirty_cards_region(NULL); |
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441 return hr; |
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442 } |
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443 |
342 | 444 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 445 _cg1r->stop(); |
342 | 446 _cmThread->stop(); |
447 } | |
448 | |
3377
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449 #ifdef ASSERT |
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450 // A region is added to the collection set as it is retired |
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451 // so an address p can point to a region which will be in the |
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452 // collection set but has not yet been retired. This method |
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453 // therefore is only accurate during a GC pause after all |
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454 // regions have been retired. It is used for debugging |
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455 // to check if an nmethod has references to objects that can |
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456 // be move during a partial collection. Though it can be |
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457 // inaccurate, it is sufficient for G1 because the conservative |
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458 // implementation of is_scavengable() for G1 will indicate that |
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459 // all nmethods must be scanned during a partial collection. |
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460 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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461 HeapRegion* hr = heap_region_containing(p); |
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462 return hr != NULL && hr->in_collection_set(); |
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463 } |
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464 #endif |
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465 |
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466 // Returns true if the reference points to an object that |
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467 // can move in an incremental collecction. |
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468 bool G1CollectedHeap::is_scavengable(const void* p) { |
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469 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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470 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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471 HeapRegion* hr = heap_region_containing(p); |
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472 if (hr == NULL) { |
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473 // perm gen (or null) |
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474 return false; |
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475 } else { |
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476 return !hr->isHumongous(); |
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477 } |
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478 } |
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479 |
342 | 480 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
481 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
482 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
483 | |
484 // Count the dirty cards at the start. | |
485 CountNonCleanMemRegionClosure count1(this); | |
486 ct_bs->mod_card_iterate(&count1); | |
487 int orig_count = count1.n(); | |
488 | |
489 // First clear the logged cards. | |
490 ClearLoggedCardTableEntryClosure clear; | |
491 dcqs.set_closure(&clear); | |
492 dcqs.apply_closure_to_all_completed_buffers(); | |
493 dcqs.iterate_closure_all_threads(false); | |
494 clear.print_histo(); | |
495 | |
496 // Now ensure that there's no dirty cards. | |
497 CountNonCleanMemRegionClosure count2(this); | |
498 ct_bs->mod_card_iterate(&count2); | |
499 if (count2.n() != 0) { | |
500 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
501 count2.n(), orig_count); | |
502 } | |
503 guarantee(count2.n() == 0, "Card table should be clean."); | |
504 | |
505 RedirtyLoggedCardTableEntryClosure redirty; | |
506 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
507 dcqs.apply_closure_to_all_completed_buffers(); | |
508 dcqs.iterate_closure_all_threads(false); | |
509 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
510 clear.calls(), orig_count); | |
511 guarantee(redirty.calls() == clear.calls(), | |
512 "Or else mechanism is broken."); | |
513 | |
514 CountNonCleanMemRegionClosure count3(this); | |
515 ct_bs->mod_card_iterate(&count3); | |
516 if (count3.n() != orig_count) { | |
517 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
518 orig_count, count3.n()); | |
519 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
520 } | |
521 | |
522 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
523 } | |
524 | |
525 // Private class members. | |
526 | |
527 G1CollectedHeap* G1CollectedHeap::_g1h; | |
528 | |
529 // Private methods. | |
530 | |
2152 | 531 HeapRegion* |
2361 | 532 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 533 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
534 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
535 if (!_secondary_free_list.is_empty()) { | |
536 if (G1ConcRegionFreeingVerbose) { | |
537 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
538 "secondary_free_list has "SIZE_FORMAT" entries", | |
539 _secondary_free_list.length()); | |
540 } | |
541 // It looks as if there are free regions available on the | |
542 // secondary_free_list. Let's move them to the free_list and try | |
543 // again to allocate from it. | |
544 append_secondary_free_list(); | |
545 | |
546 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
547 "empty we should have moved at least one entry to the free_list"); | |
548 HeapRegion* res = _free_list.remove_head(); | |
549 if (G1ConcRegionFreeingVerbose) { | |
550 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
551 "allocated "HR_FORMAT" from secondary_free_list", | |
552 HR_FORMAT_PARAMS(res)); | |
553 } | |
554 return res; | |
555 } | |
556 | |
557 // Wait here until we get notifed either when (a) there are no | |
558 // more free regions coming or (b) some regions have been moved on | |
559 // the secondary_free_list. | |
560 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
561 } | |
562 | |
563 if (G1ConcRegionFreeingVerbose) { | |
564 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
565 "could not allocate from secondary_free_list"); | |
566 } | |
567 return NULL; | |
568 } | |
569 | |
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570 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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571 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 572 "the only time we use this to allocate a humongous region is " |
573 "when we are allocating a single humongous region"); | |
574 | |
575 HeapRegion* res; | |
576 if (G1StressConcRegionFreeing) { | |
577 if (!_secondary_free_list.is_empty()) { | |
578 if (G1ConcRegionFreeingVerbose) { | |
579 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
580 "forced to look at the secondary_free_list"); | |
581 } | |
2361 | 582 res = new_region_try_secondary_free_list(); |
2152 | 583 if (res != NULL) { |
584 return res; | |
585 } | |
586 } | |
587 } | |
588 res = _free_list.remove_head_or_null(); | |
589 if (res == NULL) { | |
590 if (G1ConcRegionFreeingVerbose) { | |
591 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
592 "res == NULL, trying the secondary_free_list"); | |
593 } | |
2361 | 594 res = new_region_try_secondary_free_list(); |
2152 | 595 } |
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596 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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597 // Currently, only attempts to allocate GC alloc regions set |
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598 // do_expand to true. So, we should only reach here during a |
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599 // safepoint. If this assumption changes we might have to |
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600 // reconsider the use of _expand_heap_after_alloc_failure. |
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601 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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602 |
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603 ergo_verbose1(ErgoHeapSizing, |
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604 "attempt heap expansion", |
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605 ergo_format_reason("region allocation request failed") |
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606 ergo_format_byte("allocation request"), |
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607 word_size * HeapWordSize); |
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608 if (expand(word_size * HeapWordSize)) { |
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609 // Given that expand() succeeded in expanding the heap, and we |
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610 // always expand the heap by an amount aligned to the heap |
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611 // region size, the free list should in theory not be empty. So |
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612 // it would probably be OK to use remove_head(). But the extra |
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613 // check for NULL is unlikely to be a performance issue here (we |
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614 // just expanded the heap!) so let's just be conservative and |
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615 // use remove_head_or_null(). |
3766 | 616 res = _free_list.remove_head_or_null(); |
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617 } else { |
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618 _expand_heap_after_alloc_failure = false; |
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619 } |
342 | 620 } |
621 return res; | |
622 } | |
623 | |
3766 | 624 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
625 size_t word_size) { | |
2361 | 626 assert(isHumongous(word_size), "word_size should be humongous"); |
627 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
628 | |
3766 | 629 size_t first = G1_NULL_HRS_INDEX; |
2152 | 630 if (num_regions == 1) { |
631 // Only one region to allocate, no need to go through the slower | |
632 // path. The caller will attempt the expasion if this fails, so | |
633 // let's not try to expand here too. | |
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634 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 635 if (hr != NULL) { |
636 first = hr->hrs_index(); | |
637 } else { | |
3766 | 638 first = G1_NULL_HRS_INDEX; |
2152 | 639 } |
640 } else { | |
641 // We can't allocate humongous regions while cleanupComplete() is | |
642 // running, since some of the regions we find to be empty might not | |
643 // yet be added to the free list and it is not straightforward to | |
644 // know which list they are on so that we can remove them. Note | |
645 // that we only need to do this if we need to allocate more than | |
646 // one region to satisfy the current humongous allocation | |
647 // request. If we are only allocating one region we use the common | |
648 // region allocation code (see above). | |
649 wait_while_free_regions_coming(); | |
2361 | 650 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 651 |
652 if (free_regions() >= num_regions) { | |
3766 | 653 first = _hrs.find_contiguous(num_regions); |
654 if (first != G1_NULL_HRS_INDEX) { | |
655 for (size_t i = first; i < first + num_regions; ++i) { | |
656 HeapRegion* hr = region_at(i); | |
2152 | 657 assert(hr->is_empty(), "sanity"); |
2361 | 658 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 659 hr->set_pending_removal(true); |
660 } | |
661 _free_list.remove_all_pending(num_regions); | |
662 } | |
663 } | |
664 } | |
665 return first; | |
666 } | |
667 | |
2361 | 668 HeapWord* |
3766 | 669 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 670 size_t num_regions, |
671 size_t word_size) { | |
3766 | 672 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 673 assert(isHumongous(word_size), "word_size should be humongous"); |
674 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
675 | |
676 // Index of last region in the series + 1. | |
3766 | 677 size_t last = first + num_regions; |
2361 | 678 |
679 // We need to initialize the region(s) we just discovered. This is | |
680 // a bit tricky given that it can happen concurrently with | |
681 // refinement threads refining cards on these regions and | |
682 // potentially wanting to refine the BOT as they are scanning | |
683 // those cards (this can happen shortly after a cleanup; see CR | |
684 // 6991377). So we have to set up the region(s) carefully and in | |
685 // a specific order. | |
686 | |
687 // The word size sum of all the regions we will allocate. | |
688 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
689 assert(word_size <= word_size_sum, "sanity"); | |
690 | |
691 // This will be the "starts humongous" region. | |
3766 | 692 HeapRegion* first_hr = region_at(first); |
2361 | 693 // The header of the new object will be placed at the bottom of |
694 // the first region. | |
695 HeapWord* new_obj = first_hr->bottom(); | |
696 // This will be the new end of the first region in the series that | |
697 // should also match the end of the last region in the seriers. | |
698 HeapWord* new_end = new_obj + word_size_sum; | |
699 // This will be the new top of the first region that will reflect | |
700 // this allocation. | |
701 HeapWord* new_top = new_obj + word_size; | |
702 | |
703 // First, we need to zero the header of the space that we will be | |
704 // allocating. When we update top further down, some refinement | |
705 // threads might try to scan the region. By zeroing the header we | |
706 // ensure that any thread that will try to scan the region will | |
707 // come across the zero klass word and bail out. | |
708 // | |
709 // NOTE: It would not have been correct to have used | |
710 // CollectedHeap::fill_with_object() and make the space look like | |
711 // an int array. The thread that is doing the allocation will | |
712 // later update the object header to a potentially different array | |
713 // type and, for a very short period of time, the klass and length | |
714 // fields will be inconsistent. This could cause a refinement | |
715 // thread to calculate the object size incorrectly. | |
716 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
717 | |
718 // We will set up the first region as "starts humongous". This | |
719 // will also update the BOT covering all the regions to reflect | |
720 // that there is a single object that starts at the bottom of the | |
721 // first region. | |
722 first_hr->set_startsHumongous(new_top, new_end); | |
723 | |
724 // Then, if there are any, we will set up the "continues | |
725 // humongous" regions. | |
726 HeapRegion* hr = NULL; | |
3766 | 727 for (size_t i = first + 1; i < last; ++i) { |
728 hr = region_at(i); | |
2361 | 729 hr->set_continuesHumongous(first_hr); |
730 } | |
731 // If we have "continues humongous" regions (hr != NULL), then the | |
732 // end of the last one should match new_end. | |
733 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
734 | |
735 // Up to this point no concurrent thread would have been able to | |
736 // do any scanning on any region in this series. All the top | |
737 // fields still point to bottom, so the intersection between | |
738 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
739 // update the top fields, we'll do a storestore to make sure that | |
740 // no thread sees the update to top before the zeroing of the | |
741 // object header and the BOT initialization. | |
742 OrderAccess::storestore(); | |
743 | |
744 // Now that the BOT and the object header have been initialized, | |
745 // we can update top of the "starts humongous" region. | |
746 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
747 "new_top should be in this region"); | |
748 first_hr->set_top(new_top); | |
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749 if (_hr_printer.is_active()) { |
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750 HeapWord* bottom = first_hr->bottom(); |
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751 HeapWord* end = first_hr->orig_end(); |
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752 if ((first + 1) == last) { |
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753 // the series has a single humongous region |
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754 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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755 } else { |
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756 // the series has more than one humongous regions |
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757 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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758 } |
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759 } |
2361 | 760 |
761 // Now, we will update the top fields of the "continues humongous" | |
762 // regions. The reason we need to do this is that, otherwise, | |
763 // these regions would look empty and this will confuse parts of | |
764 // G1. For example, the code that looks for a consecutive number | |
765 // of empty regions will consider them empty and try to | |
766 // re-allocate them. We can extend is_empty() to also include | |
767 // !continuesHumongous(), but it is easier to just update the top | |
768 // fields here. The way we set top for all regions (i.e., top == | |
769 // end for all regions but the last one, top == new_top for the | |
770 // last one) is actually used when we will free up the humongous | |
771 // region in free_humongous_region(). | |
772 hr = NULL; | |
3766 | 773 for (size_t i = first + 1; i < last; ++i) { |
774 hr = region_at(i); | |
2361 | 775 if ((i + 1) == last) { |
776 // last continues humongous region | |
777 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
778 "new_top should fall on this region"); | |
779 hr->set_top(new_top); | |
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780 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 781 } else { |
782 // not last one | |
783 assert(new_top > hr->end(), "new_top should be above this region"); | |
784 hr->set_top(hr->end()); | |
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785 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 786 } |
787 } | |
788 // If we have continues humongous regions (hr != NULL), then the | |
789 // end of the last one should match new_end and its top should | |
790 // match new_top. | |
791 assert(hr == NULL || | |
792 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
793 | |
794 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
795 _summary_bytes_used += first_hr->used(); | |
796 _humongous_set.add(first_hr); | |
797 | |
798 return new_obj; | |
799 } | |
800 | |
342 | 801 // If could fit into free regions w/o expansion, try. |
802 // Otherwise, if can expand, do so. | |
803 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 804 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 805 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
806 | |
807 verify_region_sets_optional(); | |
342 | 808 |
809 size_t num_regions = | |
1973 | 810 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 811 size_t x_size = expansion_regions(); |
3766 | 812 size_t fs = _hrs.free_suffix(); |
813 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
814 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 815 // The only thing we can do now is attempt expansion. |
342 | 816 if (fs + x_size >= num_regions) { |
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817 // If the number of regions we're trying to allocate for this |
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818 // object is at most the number of regions in the free suffix, |
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819 // then the call to humongous_obj_allocate_find_first() above |
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820 // should have succeeded and we wouldn't be here. |
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821 // |
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822 // We should only be trying to expand when the free suffix is |
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823 // not sufficient for the object _and_ we have some expansion |
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824 // room available. |
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825 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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826 |
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827 ergo_verbose1(ErgoHeapSizing, |
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828 "attempt heap expansion", |
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829 ergo_format_reason("humongous allocation request failed") |
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830 ergo_format_byte("allocation request"), |
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831 word_size * HeapWordSize); |
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832 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 833 // Even though the heap was expanded, it might not have |
834 // reached the desired size. So, we cannot assume that the | |
835 // allocation will succeed. | |
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836 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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837 } |
2152 | 838 } |
839 } | |
840 | |
2361 | 841 HeapWord* result = NULL; |
3766 | 842 if (first != G1_NULL_HRS_INDEX) { |
2361 | 843 result = |
844 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
845 assert(result != NULL, "it should always return a valid result"); | |
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846 |
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847 // A successful humongous object allocation changes the used space |
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848 // information of the old generation so we need to recalculate the |
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849 // sizes and update the jstat counters here. |
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850 g1mm()->update_sizes(); |
2152 | 851 } |
852 | |
853 verify_region_sets_optional(); | |
2361 | 854 |
855 return result; | |
342 | 856 } |
857 | |
1973 | 858 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
859 assert_heap_not_locked_and_not_at_safepoint(); | |
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860 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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861 |
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862 unsigned int dummy_gc_count_before; |
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863 return attempt_allocation(word_size, &dummy_gc_count_before); |
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 |
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871 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 872 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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); |
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878 } else { |
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879 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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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 { |
903 assert(op.result() == NULL, | |
904 "the result should be NULL if the VM op did not succeed"); | |
342 | 905 } |
906 | |
907 // Give a warning if we seem to be looping forever. | |
908 if ((QueuedAllocationWarningCount > 0) && | |
909 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 910 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 911 } |
912 } | |
1973 | 913 |
914 ShouldNotReachHere(); | |
2433
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915 return NULL; |
342 | 916 } |
917 | |
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918 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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919 unsigned int *gc_count_before_ret) { |
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920 // Make sure you read the note in attempt_allocation_humongous(). |
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921 |
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922 assert_heap_not_locked_and_not_at_safepoint(); |
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923 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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924 "be called for humongous allocation requests"); |
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925 |
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926 // We should only get here after the first-level allocation attempt |
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927 // (attempt_allocation()) failed to allocate. |
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|
928 |
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929 // We will loop until a) we manage to successfully perform the |
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930 // allocation or b) we successfully schedule a collection which |
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931 // fails to perform the allocation. b) is the only case when we'll |
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932 // return NULL. |
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|
933 HeapWord* result = NULL; |
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934 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
935 bool should_try_gc; |
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|
936 unsigned int gc_count_before; |
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|
937 |
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|
938 { |
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939 MutexLockerEx x(Heap_lock); |
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|
940 |
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941 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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942 false /* bot_updates */); |
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943 if (result != NULL) { |
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|
944 return result; |
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|
945 } |
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|
946 |
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947 // If we reach here, attempt_allocation_locked() above failed to |
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948 // allocate a new region. So the mutator alloc region should be NULL. |
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949 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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950 |
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|
951 if (GC_locker::is_active_and_needs_gc()) { |
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|
952 if (g1_policy()->can_expand_young_list()) { |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
953 // No need for an ergo verbose message here, |
20213c8a3c40
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|
954 // can_expand_young_list() does this when it returns true. |
2433
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955 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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|
956 false /* bot_updates */); |
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|
957 if (result != NULL) { |
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|
958 return result; |
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|
959 } |
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|
960 } |
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|
961 should_try_gc = false; |
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|
962 } else { |
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963 // Read the GC count while still holding the Heap_lock. |
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964 gc_count_before = SharedHeap::heap()->total_collections(); |
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|
965 should_try_gc = true; |
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|
966 } |
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|
967 } |
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|
968 |
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|
969 if (should_try_gc) { |
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|
970 bool succeeded; |
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|
971 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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972 if (result != NULL) { |
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|
973 assert(succeeded, "only way to get back a non-NULL result"); |
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|
974 return result; |
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|
975 } |
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|
976 |
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|
977 if (succeeded) { |
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|
978 // If we get here we successfully scheduled a collection which |
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|
979 // failed to allocate. No point in trying to allocate |
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|
980 // further. We'll just return NULL. |
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|
981 MutexLockerEx x(Heap_lock); |
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982 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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|
983 return NULL; |
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|
984 } |
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|
985 } else { |
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|
986 GC_locker::stall_until_clear(); |
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|
987 } |
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|
988 |
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|
989 // We can reach here if we were unsuccessul in scheduling a |
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|
990 // collection (because another thread beat us to it) or if we were |
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|
991 // stalled due to the GC locker. In either can we should retry the |
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|
992 // allocation attempt in case another thread successfully |
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|
993 // performed a collection and reclaimed enough space. We do the |
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|
994 // first attempt (without holding the Heap_lock) here and the |
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|
995 // follow-on attempt will be at the start of the next loop |
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|
996 // iteration (after taking the Heap_lock). |
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|
997 result = _mutator_alloc_region.attempt_allocation(word_size, |
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|
998 false /* bot_updates */); |
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|
999 if (result != NULL ){ |
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|
1000 return result; |
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|
1001 } |
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|
1002 |
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|
1003 // Give a warning if we seem to be looping forever. |
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|
1004 if ((QueuedAllocationWarningCount > 0) && |
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|
1005 (try_count % QueuedAllocationWarningCount == 0)) { |
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|
1006 warning("G1CollectedHeap::attempt_allocation_slow() " |
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|
1007 "retries %d times", try_count); |
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|
1008 } |
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|
1009 } |
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|
1010 |
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|
1011 ShouldNotReachHere(); |
abdfc822206f
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|
1012 return NULL; |
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|
1013 } |
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|
1014 |
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1015 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1016 unsigned int * gc_count_before_ret) { |
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1017 // The structure of this method has a lot of similarities to |
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1018 // attempt_allocation_slow(). The reason these two were not merged |
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1019 // into a single one is that such a method would require several "if |
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1020 // allocation is not humongous do this, otherwise do that" |
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1021 // conditional paths which would obscure its flow. In fact, an early |
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1022 // version of this code did use a unified method which was harder to |
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1023 // follow and, as a result, it had subtle bugs that were hard to |
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1024 // track down. So keeping these two methods separate allows each to |
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1025 // be more readable. It will be good to keep these two in sync as |
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1026 // much as possible. |
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1027 |
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1028 assert_heap_not_locked_and_not_at_safepoint(); |
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1029 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1030 "should only be called for humongous allocations"); |
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1031 |
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1032 // We will loop until a) we manage to successfully perform the |
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1033 // allocation or b) we successfully schedule a collection which |
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1034 // fails to perform the allocation. b) is the only case when we'll |
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1035 // return NULL. |
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1036 HeapWord* result = NULL; |
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1037 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1038 bool should_try_gc; |
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1039 unsigned int gc_count_before; |
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1040 |
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1041 { |
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1042 MutexLockerEx x(Heap_lock); |
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1043 |
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1044 // Given that humongous objects are not allocated in young |
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1045 // regions, we'll first try to do the allocation without doing a |
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1046 // collection hoping that there's enough space in the heap. |
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1047 result = humongous_obj_allocate(word_size); |
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1048 |
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1049 if (result == NULL) { |
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1050 if (GC_locker::is_active_and_needs_gc()) { |
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1051 should_try_gc = false; |
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1052 } else { |
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1053 // Read the GC count while still holding the Heap_lock. |
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1054 gc_count_before = SharedHeap::heap()->total_collections(); |
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1055 should_try_gc = true; |
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1056 } |
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1057 } |
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1058 } |
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1059 |
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1060 if (result != NULL) { |
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1061 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation")) { |
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1062 // We need to release the Heap_lock before we try to call collect(). |
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1063 // The result will not be stored in any object before this method |
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1064 // returns, so the GC might miss it. Thus, we create a handle to the result |
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1065 // and fake an object at that place. |
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1066 CollectedHeap::fill_with_object(result, word_size, false); |
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1067 Handle h((oop)result); |
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1068 collect(GCCause::_g1_humongous_allocation); |
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1069 assert(result == (HeapWord*)h(), "Humongous objects should not be moved by collections"); |
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1070 } |
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1071 return result; |
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1072 } |
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1073 |
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1074 if (should_try_gc) { |
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1075 // If we failed to allocate the humongous object, we should try to |
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1076 // do a collection pause (if we're allowed) in case it reclaims |
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1077 // enough space for the allocation to succeed after the pause. |
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1078 |
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1079 bool succeeded; |
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1080 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1081 if (result != NULL) { |
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1082 assert(succeeded, "only way to get back a non-NULL result"); |
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1083 return result; |
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1084 } |
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1085 |
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1086 if (succeeded) { |
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1087 // If we get here we successfully scheduled a collection which |
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1088 // failed to allocate. No point in trying to allocate |
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1089 // further. We'll just return NULL. |
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1090 MutexLockerEx x(Heap_lock); |
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1091 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1092 return NULL; |
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1093 } |
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1094 } else { |
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1095 GC_locker::stall_until_clear(); |
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1096 } |
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1097 |
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1098 // We can reach here if we were unsuccessul in scheduling a |
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1099 // collection (because another thread beat us to it) or if we were |
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1100 // stalled due to the GC locker. In either can we should retry the |
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1101 // allocation attempt in case another thread successfully |
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1102 // performed a collection and reclaimed enough space. Give a |
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1103 // warning if we seem to be looping forever. |
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1104 |
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1105 if ((QueuedAllocationWarningCount > 0) && |
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1106 (try_count % QueuedAllocationWarningCount == 0)) { |
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1107 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1108 "retries %d times", try_count); |
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1109 } |
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1110 } |
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1111 |
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1112 ShouldNotReachHere(); |
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1113 return NULL; |
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1114 } |
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1115 |
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1116 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1117 bool expect_null_mutator_alloc_region) { |
2152 | 1118 assert_at_safepoint(true /* should_be_vm_thread */); |
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1119 assert(_mutator_alloc_region.get() == NULL || |
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1120 !expect_null_mutator_alloc_region, |
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1121 "the current alloc region was unexpectedly found to be non-NULL"); |
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1122 |
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1123 if (!isHumongous(word_size)) { |
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1124 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1125 false /* bot_updates */); |
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1126 } else { |
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1127 HeapWord* result = humongous_obj_allocate(word_size); |
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1128 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
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1129 g1_policy()->set_initiate_conc_mark_if_possible(); |
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1130 } |
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1131 return result; |
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1132 } |
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1133 |
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1134 ShouldNotReachHere(); |
342 | 1135 } |
1136 | |
1137 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1138 ModRefBarrierSet* _mr_bs; | |
1139 public: | |
1140 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1141 bool doHeapRegion(HeapRegion* r) { | |
1142 r->reset_gc_time_stamp(); | |
1143 if (r->continuesHumongous()) | |
1144 return false; | |
1145 HeapRegionRemSet* hrrs = r->rem_set(); | |
1146 if (hrrs != NULL) hrrs->clear(); | |
1147 // You might think here that we could clear just the cards | |
1148 // corresponding to the used region. But no: if we leave a dirty card | |
1149 // in a region we might allocate into, then it would prevent that card | |
1150 // from being enqueued, and cause it to be missed. | |
1151 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1152 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1153 return false; | |
1154 } | |
1155 }; | |
1156 | |
1157 | |
1158 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1159 ModRefBarrierSet* _mr_bs; | |
1160 public: | |
1161 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1162 bool doHeapRegion(HeapRegion* r) { | |
1163 if (r->continuesHumongous()) return false; | |
1164 if (r->used_region().word_size() != 0) { | |
1165 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1166 } | |
1167 return false; | |
1168 } | |
1169 }; | |
1170 | |
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1171 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1172 G1CollectedHeap* _g1h; |
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1173 UpdateRSOopClosure _cl; |
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1174 int _worker_i; |
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1175 public: |
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1176 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1177 _cl(g1->g1_rem_set(), worker_i), |
626
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1178 _worker_i(worker_i), |
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1179 _g1h(g1) |
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1180 { } |
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1181 |
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1182 bool doHeapRegion(HeapRegion* r) { |
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1183 if (!r->continuesHumongous()) { |
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1184 _cl.set_from(r); |
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1185 r->oop_iterate(&_cl); |
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1186 } |
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1187 return false; |
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1188 } |
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1189 }; |
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1190 |
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1191 class ParRebuildRSTask: public AbstractGangTask { |
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1192 G1CollectedHeap* _g1; |
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1193 public: |
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1194 ParRebuildRSTask(G1CollectedHeap* g1) |
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1195 : AbstractGangTask("ParRebuildRSTask"), |
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1196 _g1(g1) |
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1197 { } |
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1198 |
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1199 void work(uint worker_id) { |
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1200 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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1201 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
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1202 _g1->workers()->active_workers(), |
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1203 HeapRegion::RebuildRSClaimValue); |
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1204 } |
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1205 }; |
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1206 |
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1207 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1208 private: |
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1209 G1HRPrinter* _hr_printer; |
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1210 public: |
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1211 bool doHeapRegion(HeapRegion* hr) { |
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1212 assert(!hr->is_young(), "not expecting to find young regions"); |
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1213 // We only generate output for non-empty regions. |
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1214 if (!hr->is_empty()) { |
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1215 if (!hr->isHumongous()) { |
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1216 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1217 } else if (hr->startsHumongous()) { |
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1218 if (hr->capacity() == HeapRegion::GrainBytes) { |
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1219 // single humongous region |
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1220 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1221 } else { |
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1222 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1223 } |
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1224 } else { |
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1225 assert(hr->continuesHumongous(), "only way to get here"); |
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1226 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1227 } |
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1228 } |
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1229 return false; |
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1230 } |
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1231 |
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1232 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1233 : _hr_printer(hr_printer) { } |
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1234 }; |
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1235 |
1973 | 1236 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1237 bool clear_all_soft_refs, |
342 | 1238 size_t word_size) { |
2152 | 1239 assert_at_safepoint(true /* should_be_vm_thread */); |
1240 | |
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1241 if (GC_locker::check_active_before_gc()) { |
1973 | 1242 return false; |
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1243 } |
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1244 |
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1245 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1246 ResourceMark rm; |
1247 | |
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1248 if (PrintHeapAtGC) { |
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1249 Universe::print_heap_before_gc(); |
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1250 } |
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1251 |
4072 | 1252 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1253 verify_region_sets_optional(); |
342 | 1254 |
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1255 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1256 collector_policy()->should_clear_all_soft_refs(); |
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1257 |
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1258 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1259 |
342 | 1260 { |
1261 IsGCActiveMark x; | |
1262 | |
1263 // Timing | |
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1264 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1265 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1266 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1267 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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1268 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1269 PrintGC, true, gclog_or_tty); |
342 | 1270 |
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1271 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
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1272 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1273 |
342 | 1274 double start = os::elapsedTime(); |
1275 g1_policy()->record_full_collection_start(); | |
1276 | |
2152 | 1277 wait_while_free_regions_coming(); |
2361 | 1278 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1279 |
342 | 1280 gc_prologue(true); |
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1281 increment_total_collections(true /* full gc */); |
342 | 1282 |
1283 size_t g1h_prev_used = used(); | |
1284 assert(used() == recalculate_used(), "Should be equal"); | |
1285 | |
1286 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1287 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1288 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1289 prepare_for_verify(); |
3772
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1290 Universe::verify(/* allow dirty */ true, |
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1291 /* silent */ false, |
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1292 /* option */ VerifyOption_G1UsePrevMarking); |
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1293 |
342 | 1294 } |
3869
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1295 pre_full_gc_dump(); |
342 | 1296 |
1297 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1298 | |
3979
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1299 // Disable discovery and empty the discovered lists |
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1300 // for the CM ref processor. |
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1301 ref_processor_cm()->disable_discovery(); |
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1302 ref_processor_cm()->abandon_partial_discovery(); |
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1303 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1304 |
1305 // Abandon current iterations of concurrent marking and concurrent | |
1306 // refinement, if any are in progress. | |
1307 concurrent_mark()->abort(); | |
1308 | |
1309 // Make sure we'll choose a new allocation region afterwards. | |
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1310 release_mutator_alloc_region(); |
636 | 1311 abandon_gc_alloc_regions(); |
1861 | 1312 g1_rem_set()->cleanupHRRS(); |
1394
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1313 |
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1314 // We should call this after we retire any currently active alloc |
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1315 // regions so that all the ALLOC / RETIRE events are generated |
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1316 // before the start GC event. |
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1317 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1318 |
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1319 // We may have added regions to the current incremental collection |
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1320 // set between the last GC or pause and now. We need to clear the |
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1321 // incremental collection set and then start rebuilding it afresh |
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1322 // after this full GC. |
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1323 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1324 g1_policy()->clear_incremental_cset(); |
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1325 g1_policy()->stop_incremental_cset_building(); |
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1326 |
4072 | 1327 tear_down_region_sets(false /* free_list_only */); |
4710 | 1328 g1_policy()->set_gcs_are_young(true); |
342 | 1329 |
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1330 // See the comments in g1CollectedHeap.hpp and |
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|
1331 // G1CollectedHeap::ref_processing_init() about |
1974
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6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1332 // how reference processing currently works in G1. |
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|
1333 |
3979
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1334 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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1335 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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1336 |
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1337 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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1338 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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|
1339 |
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1340 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1341 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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1342 |
342 | 1343 // Do collection work |
1344 { | |
1345 HandleMark hm; // Discard invalid handles created during gc | |
3979
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|
1346 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1347 } |
3979
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|
1348 |
2152 | 1349 assert(free_regions() == 0, "we should not have added any free regions"); |
4072 | 1350 rebuild_region_sets(false /* free_list_only */); |
342 | 1351 |
3979
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1352 // Enqueue any discovered reference objects that have |
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|
1353 // not been removed from the discovered lists. |
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|
1354 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1355 |
1356 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1357 | |
1089
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|
1358 MemoryService::track_memory_usage(); |
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|
1359 |
342 | 1360 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1361 HandleMark hm; // Discard invalid handles created during verification | |
1362 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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|
1363 prepare_for_verify(); |
3772
6747fd0512e0
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|
1364 Universe::verify(/* allow dirty */ false, |
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|
1365 /* silent */ false, |
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|
1366 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1367 |
342 | 1368 } |
3979
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|
1369 |
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|
1370 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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|
1371 ref_processor_stw()->verify_no_references_recorded(); |
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|
1372 |
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|
1373 // Note: since we've just done a full GC, concurrent |
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|
1374 // marking is no longer active. Therefore we need not |
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|
1375 // re-enable reference discovery for the CM ref processor. |
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|
1376 // That will be done at the start of the next marking cycle. |
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|
1377 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1378 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1379 |
1380 reset_gc_time_stamp(); | |
1381 // Since everything potentially moved, we will clear all remembered | |
626
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1382 // sets, and clear all cards. Later we will rebuild remebered |
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1383 // sets. We will also reset the GC time stamps of the regions. |
342 | 1384 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1385 heap_region_iterate(&rs_clear); | |
1386 | |
1387 // Resize the heap if necessary. | |
1656
4e5661ba9d98
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|
1388 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1389 |
3778
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|
1390 if (_hr_printer.is_active()) { |
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|
1391 // We should do this after we potentially resize the heap so |
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|
1392 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1393 // the end GC event. |
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|
1394 |
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|
1395 PostCompactionPrinterClosure cl(hr_printer()); |
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|
1396 heap_region_iterate(&cl); |
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|
1397 |
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|
1398 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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|
1399 } |
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|
1400 |
342 | 1401 if (_cg1r->use_cache()) { |
1402 _cg1r->clear_and_record_card_counts(); | |
1403 _cg1r->clear_hot_cache(); | |
1404 } | |
1405 | |
626
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|
1406 // Rebuild remembered sets of all regions. |
1833
8b10f48633dc
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|
1407 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4728
441e946dc1af
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diff
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|
1408 uint n_workers = |
4095
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|
1409 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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|
1410 workers()->active_workers(), |
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|
1411 Threads::number_of_non_daemon_threads()); |
bca17e38de00
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|
1412 assert(UseDynamicNumberOfGCThreads || |
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|
1413 n_workers == workers()->total_workers(), |
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|
1414 "If not dynamic should be using all the workers"); |
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|
1415 workers()->set_active_workers(n_workers); |
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|
1416 // Set parallel threads in the heap (_n_par_threads) only |
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|
1417 // before a parallel phase and always reset it to 0 after |
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|
1418 // the phase so that the number of parallel threads does |
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|
1419 // no get carried forward to a serial phase where there |
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|
1420 // may be code that is "possibly_parallel". |
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|
1421 set_par_threads(n_workers); |
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|
1422 |
626
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|
1423 ParRebuildRSTask rebuild_rs_task(this); |
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1424 assert(check_heap_region_claim_values( |
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|
1425 HeapRegion::InitialClaimValue), "sanity check"); |
4095
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|
1426 assert(UseDynamicNumberOfGCThreads || |
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|
1427 workers()->active_workers() == workers()->total_workers(), |
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|
1428 "Unless dynamic should use total workers"); |
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|
1429 // Use the most recent number of active workers |
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|
1430 assert(workers()->active_workers() > 0, |
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|
1431 "Active workers not properly set"); |
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|
1432 set_par_threads(workers()->active_workers()); |
626
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|
1433 workers()->run_task(&rebuild_rs_task); |
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|
1434 set_par_threads(0); |
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|
1435 assert(check_heap_region_claim_values( |
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|
1436 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1437 reset_heap_region_claim_values(); |
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|
1438 } else { |
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|
1439 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1440 heap_region_iterate(&rebuild_rs); |
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|
1441 } |
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|
1442 |
342 | 1443 if (PrintGC) { |
1444 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1445 } | |
1446 | |
1447 if (true) { // FIXME | |
1448 // Ask the permanent generation to adjust size for full collections | |
1449 perm()->compute_new_size(); | |
1450 } | |
1451 | |
1394
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|
1452 // Start a new incremental collection set for the next pause |
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|
1453 assert(g1_policy()->collection_set() == NULL, "must be"); |
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|
1454 g1_policy()->start_incremental_cset_building(); |
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|
1455 |
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|
1456 // Clear the _cset_fast_test bitmap in anticipation of adding |
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|
1457 // regions to the incremental collection set for the next |
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|
1458 // evacuation pause. |
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|
1459 clear_cset_fast_test(); |
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|
1460 |
2433
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diff
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|
1461 init_mutator_alloc_region(); |
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|
1462 |
342 | 1463 double end = os::elapsedTime(); |
1464 g1_policy()->record_full_collection_end(); | |
1465 | |
546
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diff
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|
1466 #ifdef TRACESPINNING |
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6690928: Use spinning in combination with yields for workstealing termination.
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diff
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|
1467 ParallelTaskTerminator::print_termination_counts(); |
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|
1468 #endif |
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|
1469 |
342 | 1470 gc_epilogue(true); |
1471 | |
794 | 1472 // Discard all rset updates |
1473 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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595
diff
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|
1474 assert(!G1DeferredRSUpdate |
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diff
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|
1475 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1476 } |
1477 | |
3867
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|
1478 _young_list->reset_sampled_info(); |
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|
1479 // At this point there should be no regions in the |
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|
1480 // entire heap tagged as young. |
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diff
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|
1481 assert( check_young_list_empty(true /* check_heap */), |
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|
1482 "young list should be empty at this point"); |
838
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1483 |
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1484 // Update the number of full collections that have been completed. |
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1485 increment_full_collections_completed(false /* concurrent */); |
1656
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1486 |
3766 | 1487 _hrs.verify_optional(); |
2152 | 1488 verify_region_sets_optional(); |
1489 | |
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1490 if (PrintHeapAtGC) { |
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1491 Universe::print_heap_after_gc(); |
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1492 } |
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1493 g1mm()->update_sizes(); |
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1494 post_full_gc_dump(); |
1973 | 1495 |
1496 return true; | |
342 | 1497 } |
1498 | |
1499 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1500 // do_collection() will return whether it succeeded in performing |
1501 // the GC. Currently, there is no facility on the | |
1502 // do_full_collection() API to notify the caller than the collection | |
1503 // did not succeed (e.g., because it was locked out by the GC | |
1504 // locker). So, right now, we'll ignore the return value. | |
1505 bool dummy = do_collection(true, /* explicit_gc */ | |
1506 clear_all_soft_refs, | |
1507 0 /* word_size */); | |
342 | 1508 } |
1509 | |
1510 // This code is mostly copied from TenuredGeneration. | |
1511 void | |
1512 G1CollectedHeap:: | |
1513 resize_if_necessary_after_full_collection(size_t word_size) { | |
1514 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1515 | |
1516 // Include the current allocation, if any, and bytes that will be | |
1517 // pre-allocated to support collections, as "used". | |
1518 const size_t used_after_gc = used(); | |
1519 const size_t capacity_after_gc = capacity(); | |
1520 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1521 | |
1717
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1522 // This is enforced in arguments.cpp. |
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1523 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1524 "otherwise the code below doesn't make sense"); |
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1525 |
342 | 1526 // We don't have floating point command-line arguments |
1717
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1527 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1528 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1529 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1530 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1531 | |
1717
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1532 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1533 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1534 |
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1535 // We have to be careful here as these two calculations can overflow |
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1536 // 32-bit size_t's. |
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1537 double used_after_gc_d = (double) used_after_gc; |
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1538 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1539 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1540 |
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1541 // Let's make sure that they are both under the max heap size, which |
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1542 // by default will make them fit into a size_t. |
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1543 double desired_capacity_upper_bound = (double) max_heap_size; |
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1544 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1545 desired_capacity_upper_bound); |
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1546 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1547 desired_capacity_upper_bound); |
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1548 |
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1549 // We can now safely turn them into size_t's. |
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1550 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1551 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1552 |
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1553 // This assert only makes sense here, before we adjust them |
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1554 // with respect to the min and max heap size. |
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1555 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1556 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1557 "maximum_desired_capacity = "SIZE_FORMAT, |
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1558 minimum_desired_capacity, maximum_desired_capacity)); |
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1559 |
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1560 // Should not be greater than the heap max size. No need to adjust |
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1561 // it with respect to the heap min size as it's a lower bound (i.e., |
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1562 // we'll try to make the capacity larger than it, not smaller). |
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1563 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1564 // Should not be less than the heap min size. No need to adjust it |
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1565 // with respect to the heap max size as it's an upper bound (i.e., |
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1566 // we'll try to make the capacity smaller than it, not greater). |
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1567 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1568 |
1717
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1569 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1570 // Don't expand unless it's significant |
1571 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1572 ergo_verbose4(ErgoHeapSizing, |
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1573 "attempt heap expansion", |
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1574 ergo_format_reason("capacity lower than " |
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1575 "min desired capacity after Full GC") |
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1576 ergo_format_byte("capacity") |
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1577 ergo_format_byte("occupancy") |
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1578 ergo_format_byte_perc("min desired capacity"), |
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1579 capacity_after_gc, used_after_gc, |
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1580 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1581 expand(expand_bytes); |
342 | 1582 |
1583 // No expansion, now see if we want to shrink | |
1717
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1584 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1585 // Capacity too large, compute shrinking size |
1586 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
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1587 ergo_verbose4(ErgoHeapSizing, |
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1588 "attempt heap shrinking", |
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1589 ergo_format_reason("capacity higher than " |
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1590 "max desired capacity after Full GC") |
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1591 ergo_format_byte("capacity") |
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1592 ergo_format_byte("occupancy") |
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1593 ergo_format_byte_perc("max desired capacity"), |
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1594 capacity_after_gc, used_after_gc, |
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1595 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1596 shrink(shrink_bytes); |
1597 } | |
1598 } | |
1599 | |
1600 | |
1601 HeapWord* | |
1973 | 1602 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1603 bool* succeeded) { | |
2152 | 1604 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1605 |
1606 *succeeded = true; | |
1607 // Let's attempt the allocation first. | |
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1608 HeapWord* result = |
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1609 attempt_allocation_at_safepoint(word_size, |
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1610 false /* expect_null_mutator_alloc_region */); |
1973 | 1611 if (result != NULL) { |
1612 assert(*succeeded, "sanity"); | |
1613 return result; | |
1614 } | |
342 | 1615 |
1616 // In a G1 heap, we're supposed to keep allocation from failing by | |
1617 // incremental pauses. Therefore, at least for now, we'll favor | |
1618 // expansion over collection. (This might change in the future if we can | |
1619 // do something smarter than full collection to satisfy a failed alloc.) | |
1620 result = expand_and_allocate(word_size); | |
1621 if (result != NULL) { | |
1973 | 1622 assert(*succeeded, "sanity"); |
342 | 1623 return result; |
1624 } | |
1625 | |
1973 | 1626 // Expansion didn't work, we'll try to do a Full GC. |
1627 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1628 false, /* clear_all_soft_refs */ | |
1629 word_size); | |
1630 if (!gc_succeeded) { | |
1631 *succeeded = false; | |
1632 return NULL; | |
1633 } | |
1634 | |
1635 // Retry the allocation | |
1636 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1637 true /* expect_null_mutator_alloc_region */); |
342 | 1638 if (result != NULL) { |
1973 | 1639 assert(*succeeded, "sanity"); |
342 | 1640 return result; |
1641 } | |
1642 | |
1973 | 1643 // Then, try a Full GC that will collect all soft references. |
1644 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1645 true, /* clear_all_soft_refs */ | |
1646 word_size); | |
1647 if (!gc_succeeded) { | |
1648 *succeeded = false; | |
1649 return NULL; | |
1650 } | |
1651 | |
1652 // Retry the allocation once more | |
1653 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1654 true /* expect_null_mutator_alloc_region */); |
342 | 1655 if (result != NULL) { |
1973 | 1656 assert(*succeeded, "sanity"); |
342 | 1657 return result; |
1658 } | |
1659 | |
1387
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1660 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1661 "Flag should have been handled and cleared prior to this point"); |
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1662 |
342 | 1663 // What else? We might try synchronous finalization later. If the total |
1664 // space available is large enough for the allocation, then a more | |
1665 // complete compaction phase than we've tried so far might be | |
1666 // appropriate. | |
1973 | 1667 assert(*succeeded, "sanity"); |
342 | 1668 return NULL; |
1669 } | |
1670 | |
1671 // Attempting to expand the heap sufficiently | |
1672 // to support an allocation of the given "word_size". If | |
1673 // successful, perform the allocation and return the address of the | |
1674 // allocated block, or else "NULL". | |
1675 | |
1676 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1677 assert_at_safepoint(true /* should_be_vm_thread */); |
1678 | |
1679 verify_region_sets_optional(); | |
1973 | 1680 |
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1681 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1682 ergo_verbose1(ErgoHeapSizing, |
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1683 "attempt heap expansion", |
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1684 ergo_format_reason("allocation request failed") |
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1685 ergo_format_byte("allocation request"), |
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1686 word_size * HeapWordSize); |
2188
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1687 if (expand(expand_bytes)) { |
3766 | 1688 _hrs.verify_optional(); |
2188
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1689 verify_region_sets_optional(); |
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1690 return attempt_allocation_at_safepoint(word_size, |
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1691 false /* expect_null_mutator_alloc_region */); |
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1692 } |
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1693 return NULL; |
342 | 1694 } |
1695 | |
3766 | 1696 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1697 HeapWord* new_end) { | |
1698 assert(old_end != new_end, "don't call this otherwise"); | |
1699 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1700 | |
1701 // Update the committed mem region. | |
1702 _g1_committed.set_end(new_end); | |
1703 // Tell the card table about the update. | |
1704 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1705 // Tell the BOT about the update. | |
1706 _bot_shared->resize(_g1_committed.word_size()); | |
1707 } | |
1708 | |
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1709 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1710 size_t old_mem_size = _g1_storage.committed_size(); |
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1711 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1712 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1713 HeapRegion::GrainBytes); | |
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1714 ergo_verbose2(ErgoHeapSizing, |
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1715 "expand the heap", |
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1716 ergo_format_byte("requested expansion amount") |
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1717 ergo_format_byte("attempted expansion amount"), |
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1718 expand_bytes, aligned_expand_bytes); |
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1719 |
3766 | 1720 // First commit the memory. |
1721 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1722 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1723 if (successful) { |
3766 | 1724 // Then propagate this update to the necessary data structures. |
1725 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1726 update_committed_space(old_end, new_end); | |
1727 | |
1728 FreeRegionList expansion_list("Local Expansion List"); | |
1729 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1730 assert(mr.start() == old_end, "post-condition"); | |
1731 // mr might be a smaller region than what was requested if | |
1732 // expand_by() was unable to allocate the HeapRegion instances | |
1733 assert(mr.end() <= new_end, "post-condition"); | |
1734 | |
1735 size_t actual_expand_bytes = mr.byte_size(); | |
1736 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1737 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1738 "post-condition"); | |
1739 if (actual_expand_bytes < aligned_expand_bytes) { | |
1740 // We could not expand _hrs to the desired size. In this case we | |
1741 // need to shrink the committed space accordingly. | |
1742 assert(mr.end() < new_end, "invariant"); | |
1743 | |
1744 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1745 // First uncommit the memory. | |
1746 _g1_storage.shrink_by(diff_bytes); | |
1747 // Then propagate this update to the necessary data structures. | |
1748 update_committed_space(new_end, mr.end()); | |
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1749 } |
3766 | 1750 _free_list.add_as_tail(&expansion_list); |
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1751 |
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1752 if (_hr_printer.is_active()) { |
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1753 HeapWord* curr = mr.start(); |
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1754 while (curr < mr.end()) { |
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1755 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1756 _hr_printer.commit(curr, curr_end); |
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1757 curr = curr_end; |
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1758 } |
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1759 assert(curr == mr.end(), "post-condition"); |
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1760 } |
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1761 g1_policy()->record_new_heap_size(n_regions()); |
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1762 } else { |
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1763 ergo_verbose0(ErgoHeapSizing, |
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1764 "did not expand the heap", |
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1765 ergo_format_reason("heap expansion operation failed")); |
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1766 // The expansion of the virtual storage space was unsuccessful. |
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1767 // Let's see if it was because we ran out of swap. |
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1768 if (G1ExitOnExpansionFailure && |
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1769 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1770 // We had head room... |
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1771 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1772 } |
1773 } | |
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1774 return successful; |
342 | 1775 } |
1776 | |
3766 | 1777 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1778 size_t old_mem_size = _g1_storage.committed_size(); |
1779 size_t aligned_shrink_bytes = | |
1780 ReservedSpace::page_align_size_down(shrink_bytes); | |
1781 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1782 HeapRegion::GrainBytes); | |
1783 size_t num_regions_deleted = 0; | |
3766 | 1784 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1785 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1786 assert(mr.end() == old_end, "post-condition"); | |
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1787 |
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1788 ergo_verbose3(ErgoHeapSizing, |
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1789 "shrink the heap", |
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1790 ergo_format_byte("requested shrinking amount") |
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1791 ergo_format_byte("aligned shrinking amount") |
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1792 ergo_format_byte("attempted shrinking amount"), |
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1793 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1794 if (mr.byte_size() > 0) { |
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1795 if (_hr_printer.is_active()) { |
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1796 HeapWord* curr = mr.end(); |
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1797 while (curr > mr.start()) { |
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1798 HeapWord* curr_end = curr; |
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1799 curr -= HeapRegion::GrainWords; |
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1800 _hr_printer.uncommit(curr, curr_end); |
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1801 } |
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1802 assert(curr == mr.start(), "post-condition"); |
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1803 } |
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1804 |
342 | 1805 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1806 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1807 assert(mr.start() == new_end, "post-condition"); | |
1808 | |
1809 _expansion_regions += num_regions_deleted; | |
1810 update_committed_space(old_end, new_end); | |
1811 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1812 g1_policy()->record_new_heap_size(n_regions()); |
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1813 } else { |
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1814 ergo_verbose0(ErgoHeapSizing, |
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1815 "did not shrink the heap", |
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1816 ergo_format_reason("heap shrinking operation failed")); |
342 | 1817 } |
1818 } | |
1819 | |
1820 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1821 verify_region_sets_optional(); |
1822 | |
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1823 // We should only reach here at the end of a Full GC which means we |
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1824 // should not not be holding to any GC alloc regions. The method |
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1825 // below will make sure of that and do any remaining clean up. |
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1826 abandon_gc_alloc_regions(); |
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1827 |
2152 | 1828 // Instead of tearing down / rebuilding the free lists here, we |
1829 // could instead use the remove_all_pending() method on free_list to | |
1830 // remove only the ones that we need to remove. | |
4072 | 1831 tear_down_region_sets(true /* free_list_only */); |
342 | 1832 shrink_helper(shrink_bytes); |
4072 | 1833 rebuild_region_sets(true /* free_list_only */); |
2152 | 1834 |
3766 | 1835 _hrs.verify_optional(); |
2152 | 1836 verify_region_sets_optional(); |
342 | 1837 } |
1838 | |
1839 // Public methods. | |
1840 | |
1841 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1842 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1843 #endif // _MSC_VER | |
1844 | |
1845 | |
1846 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1847 SharedHeap(policy_), | |
1848 _g1_policy(policy_), | |
1111 | 1849 _dirty_card_queue_set(false), |
1705 | 1850 _into_cset_dirty_card_queue_set(false), |
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1851 _is_alive_closure_cm(this), |
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1852 _is_alive_closure_stw(this), |
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1853 _ref_processor_cm(NULL), |
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1854 _ref_processor_stw(NULL), |
342 | 1855 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1856 _bot_shared(NULL), | |
1857 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1858 _evac_failure_scan_stack(NULL) , | |
1859 _mark_in_progress(false), | |
2152 | 1860 _cg1r(NULL), _summary_bytes_used(0), |
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1861 _g1mm(NULL), |
342 | 1862 _refine_cte_cl(NULL), |
1863 _full_collection(false), | |
2152 | 1864 _free_list("Master Free List"), |
1865 _secondary_free_list("Secondary Free List"), | |
4072 | 1866 _old_set("Old Set"), |
2152 | 1867 _humongous_set("Master Humongous Set"), |
1868 _free_regions_coming(false), | |
342 | 1869 _young_list(new YoungList(this)), |
1870 _gc_time_stamp(0), | |
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1871 _retained_old_gc_alloc_region(NULL), |
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1872 _expand_heap_after_alloc_failure(true), |
526 | 1873 _surviving_young_words(NULL), |
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1874 _full_collections_completed(0), |
526 | 1875 _in_cset_fast_test(NULL), |
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1876 _in_cset_fast_test_base(NULL), |
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1877 _dirty_cards_region_list(NULL), |
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1878 _worker_cset_start_region(NULL), |
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1879 _worker_cset_start_region_time_stamp(NULL) { |
342 | 1880 _g1h = this; // To catch bugs. |
1881 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1882 vm_exit_during_initialization("Failed necessary allocation."); | |
1883 } | |
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1884 |
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1885 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1886 |
342 | 1887 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1888 _task_queues = new RefToScanQueueSet(n_queues); | |
1889 | |
1890 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1891 assert(n_rem_sets > 0, "Invariant."); | |
1892 | |
1893 HeapRegionRemSetIterator** iter_arr = | |
1894 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1895 for (int i = 0; i < n_queues; i++) { | |
1896 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1897 } | |
1898 _rem_set_iterator = iter_arr; | |
1899 | |
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1900 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1901 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1902 |
342 | 1903 for (int i = 0; i < n_queues; i++) { |
1904 RefToScanQueue* q = new RefToScanQueue(); | |
1905 q->initialize(); | |
1906 _task_queues->register_queue(i, q); | |
1907 } | |
1908 | |
4709
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1909 clear_cset_start_regions(); |
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1910 |
342 | 1911 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1912 } | |
1913 | |
1914 jint G1CollectedHeap::initialize() { | |
1166 | 1915 CollectedHeap::pre_initialize(); |
342 | 1916 os::enable_vtime(); |
1917 | |
1918 // Necessary to satisfy locking discipline assertions. | |
1919 | |
1920 MutexLocker x(Heap_lock); | |
1921 | |
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1922 // We have to initialize the printer before committing the heap, as |
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1923 // it will be used then. |
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1924 _hr_printer.set_active(G1PrintHeapRegions); |
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1925 |
342 | 1926 // While there are no constraints in the GC code that HeapWordSize |
1927 // be any particular value, there are multiple other areas in the | |
1928 // system which believe this to be true (e.g. oop->object_size in some | |
1929 // cases incorrectly returns the size in wordSize units rather than | |
1930 // HeapWordSize). | |
1931 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1932 | |
1933 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1934 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1935 | |
1936 // Ensure that the sizes are properly aligned. | |
1937 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1938 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1939 | |
1940 _cg1r = new ConcurrentG1Refine(); | |
1941 | |
1942 // Reserve the maximum. | |
1943 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1944 // Includes the perm-gen. | |
642
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1945 |
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1946 // When compressed oops are enabled, the preferred heap base |
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1947 // is calculated by subtracting the requested size from the |
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1948 // 32Gb boundary and using the result as the base address for |
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1949 // heap reservation. If the requested size is not aligned to |
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1950 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1951 // into the ReservedHeapSpace constructor) then the actual |
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1952 // base of the reserved heap may end up differing from the |
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1953 // address that was requested (i.e. the preferred heap base). |
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1954 // If this happens then we could end up using a non-optimal |
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1955 // compressed oops mode. |
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1956 |
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1957 // Since max_byte_size is aligned to the size of a heap region (checked |
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1958 // above), we also need to align the perm gen size as it might not be. |
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1959 const size_t total_reserved = max_byte_size + |
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1960 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1961 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1962 |
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1963 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1964 |
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1965 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1966 UseLargePages, addr); |
642
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1967 |
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1968 if (UseCompressedOops) { |
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1969 if (addr != NULL && !heap_rs.is_reserved()) { |
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1970 // Failed to reserve at specified address - the requested memory |
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1971 // region is taken already, for example, by 'java' launcher. |
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1972 // Try again to reserver heap higher. |
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1973 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1974 |
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1975 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1976 UseLargePages, addr); |
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1977 |
642
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1978 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1979 // Failed to reserve at specified address again - give up. |
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1980 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1981 assert(addr == NULL, ""); |
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1982 |
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1983 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1984 UseLargePages, addr); |
642
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1985 heap_rs = heap_rs1; |
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1986 } else { |
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1987 heap_rs = heap_rs0; |
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1988 } |
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1989 } |
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1990 } |
342 | 1991 |
1992 if (!heap_rs.is_reserved()) { | |
1993 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1994 return JNI_ENOMEM; | |
1995 } | |
1996 | |
1997 // It is important to do this in a way such that concurrent readers can't | |
1998 // temporarily think somethings in the heap. (I've actually seen this | |
1999 // happen in asserts: DLD.) | |
2000 _reserved.set_word_size(0); | |
2001 _reserved.set_start((HeapWord*)heap_rs.base()); | |
2002 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
2003 | |
2004 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
2005 | |
2006 // Create the gen rem set (and barrier set) for the entire reserved region. | |
2007 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
2008 set_barrier_set(rem_set()->bs()); | |
2009 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
2010 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
2011 } else { | |
2012 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
2013 return JNI_ENOMEM; | |
2014 } | |
2015 | |
2016 // Also create a G1 rem set. | |
1861 | 2017 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
2018 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 2019 } else { |
1861 | 2020 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
2021 return JNI_ENOMEM; | |
342 | 2022 } |
2023 | |
2024 // Carve out the G1 part of the heap. | |
2025 | |
2026 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2027 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2028 g1_rs.size()/HeapWordSize); | |
2029 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
2030 | |
2031 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
2032 | |
2033 _g1_storage.initialize(g1_rs, 0); | |
2034 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2035 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
2036 (HeapWord*) _g1_reserved.end(), | |
2037 _expansion_regions); | |
342 | 2038 |
807
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2039 // 6843694 - ensure that the maximum region index can fit |
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2040 // in the remembered set structures. |
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2041 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2042 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2043 |
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2044 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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2045 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
3986
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2046 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
942
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2047 "too many cards per region"); |
807
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2048 |
2152 | 2049 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2050 | |
342 | 2051 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2052 heap_word_size(init_byte_size)); | |
2053 | |
2054 _g1h = this; | |
2055 | |
1394
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2056 _in_cset_fast_test_length = max_regions(); |
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2057 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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2058 |
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2059 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2060 // beginning of the heap every time we want to index; basically |
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2061 // it's the same with what we do with the card table. |
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2062 _in_cset_fast_test = _in_cset_fast_test_base - |
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2063 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2064 |
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2065 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2066 // regions to the incremental collection set for the first |
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2067 // evacuation pause. |
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2068 clear_cset_fast_test(); |
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2069 |
342 | 2070 // Create the ConcurrentMark data structure and thread. |
2071 // (Must do this late, so that "max_regions" is defined.) | |
2072 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2073 _cmThread = _cm->cmThread(); | |
2074 | |
2075 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2076 HeapRegionRemSet::init_heap(max_regions()); | |
2077 | |
677 | 2078 // Now expand into the initial heap size. |
2188
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2079 if (!expand(init_byte_size)) { |
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2080 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2081 return JNI_ENOMEM; |
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2082 } |
342 | 2083 |
2084 // Perform any initialization actions delegated to the policy. | |
2085 g1_policy()->init(); | |
2086 | |
2087 _refine_cte_cl = | |
2088 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2089 g1_rem_set(), | |
2090 concurrent_g1_refine()); | |
2091 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2092 | |
2093 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2094 SATB_Q_FL_lock, | |
1111 | 2095 G1SATBProcessCompletedThreshold, |
342 | 2096 Shared_SATB_Q_lock); |
794 | 2097 |
2098 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2099 DirtyCardQ_FL_lock, | |
1111 | 2100 concurrent_g1_refine()->yellow_zone(), |
2101 concurrent_g1_refine()->red_zone(), | |
794 | 2102 Shared_DirtyCardQ_lock); |
2103 | |
616
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2104 if (G1DeferredRSUpdate) { |
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2105 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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2106 DirtyCardQ_FL_lock, |
1111 | 2107 -1, // never trigger processing |
2108 -1, // no limit on length | |
616
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2109 Shared_DirtyCardQ_lock, |
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2110 &JavaThread::dirty_card_queue_set()); |
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2111 } |
1705 | 2112 |
2113 // Initialize the card queue set used to hold cards containing | |
2114 // references into the collection set. | |
2115 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2116 DirtyCardQ_FL_lock, | |
2117 -1, // never trigger processing | |
2118 -1, // no limit on length | |
2119 Shared_DirtyCardQ_lock, | |
2120 &JavaThread::dirty_card_queue_set()); | |
2121 | |
342 | 2122 // In case we're keeping closure specialization stats, initialize those |
2123 // counts and that mechanism. | |
2124 SpecializationStats::clear(); | |
2125 | |
2126 // Do later initialization work for concurrent refinement. | |
2127 _cg1r->init(); | |
2128 | |
2433
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2129 // Here we allocate the dummy full region that is required by the |
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2130 // G1AllocRegion class. If we don't pass an address in the reserved |
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2131 // space here, lots of asserts fire. |
3766 | 2132 |
2133 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2134 _g1_reserved.start()); | |
2433
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2135 // We'll re-use the same region whether the alloc region will |
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2136 // require BOT updates or not and, if it doesn't, then a non-young |
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2137 // region will complain that it cannot support allocations without |
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2138 // BOT updates. So we'll tag the dummy region as young to avoid that. |
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|
2139 dummy_region->set_young(); |
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|
2140 // Make sure it's full. |
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|
2141 dummy_region->set_top(dummy_region->end()); |
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2142 G1AllocRegion::setup(this, dummy_region); |
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|
2143 |
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|
2144 init_mutator_alloc_region(); |
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|
2145 |
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2146 // Do create of the monitoring and management support so that |
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|
2147 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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|
2148 _g1mm = new G1MonitoringSupport(this); |
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2149 |
342 | 2150 return JNI_OK; |
2151 } | |
2152 | |
2153 void G1CollectedHeap::ref_processing_init() { | |
1974
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2154 // Reference processing in G1 currently works as follows: |
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2155 // |
3979
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2156 // * There are two reference processor instances. One is |
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2157 // used to record and process discovered references |
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2158 // during concurrent marking; the other is used to |
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2159 // record and process references during STW pauses |
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2160 // (both full and incremental). |
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2161 // * Both ref processors need to 'span' the entire heap as |
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2162 // the regions in the collection set may be dotted around. |
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|
2163 // |
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2164 // * For the concurrent marking ref processor: |
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2165 // * Reference discovery is enabled at initial marking. |
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2166 // * Reference discovery is disabled and the discovered |
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2167 // references processed etc during remarking. |
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2168 // * Reference discovery is MT (see below). |
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2169 // * Reference discovery requires a barrier (see below). |
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2170 // * Reference processing may or may not be MT |
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2171 // (depending on the value of ParallelRefProcEnabled |
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|
2172 // and ParallelGCThreads). |
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|
2173 // * A full GC disables reference discovery by the CM |
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|
2174 // ref processor and abandons any entries on it's |
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|
2175 // discovered lists. |
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|
2176 // |
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2177 // * For the STW processor: |
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2178 // * Non MT discovery is enabled at the start of a full GC. |
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2179 // * Processing and enqueueing during a full GC is non-MT. |
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2180 // * During a full GC, references are processed after marking. |
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2181 // |
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2182 // * Discovery (may or may not be MT) is enabled at the start |
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2183 // of an incremental evacuation pause. |
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2184 // * References are processed near the end of a STW evacuation pause. |
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2185 // * For both types of GC: |
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|
2186 // * Discovery is atomic - i.e. not concurrent. |
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|
2187 // * Reference discovery will not need a barrier. |
1974
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|
2188 |
342 | 2189 SharedHeap::ref_processing_init(); |
2190 MemRegion mr = reserved_region(); | |
3979
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|
2191 |
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|
2192 // Concurrent Mark ref processor |
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|
2193 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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diff
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|
2194 new ReferenceProcessor(mr, // span |
3979
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2195 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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|
2196 // mt processing |
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|
2197 (int) ParallelGCThreads, |
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|
2198 // degree of mt processing |
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|
2199 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
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|
2200 // mt discovery |
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|
2201 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
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|
2202 // degree of mt discovery |
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|
2203 false, |
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|
2204 // Reference discovery is not atomic |
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diff
changeset
|
2205 &_is_alive_closure_cm, |
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changeset
|
2206 // is alive closure |
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diff
changeset
|
2207 // (for efficiency/performance) |
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diff
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|
2208 true); |
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diff
changeset
|
2209 // Setting next fields of discovered |
4dfb2df418f2
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diff
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|
2210 // lists requires a barrier. |
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changeset
|
2211 |
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|
2212 // STW ref processor |
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|
2213 _ref_processor_stw = |
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changeset
|
2214 new ReferenceProcessor(mr, // span |
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|
2215 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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|
2216 // mt processing |
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|
2217 MAX2((int)ParallelGCThreads, 1), |
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diff
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|
2218 // degree of mt processing |
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diff
changeset
|
2219 (ParallelGCThreads > 1), |
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diff
changeset
|
2220 // mt discovery |
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|
2221 MAX2((int)ParallelGCThreads, 1), |
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|
2222 // degree of mt discovery |
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diff
changeset
|
2223 true, |
4dfb2df418f2
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diff
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|
2224 // Reference discovery is atomic |
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diff
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|
2225 &_is_alive_closure_stw, |
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diff
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|
2226 // is alive closure |
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diff
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|
2227 // (for efficiency/performance) |
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diff
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|
2228 false); |
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diff
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|
2229 // Setting next fields of discovered |
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|
2230 // lists requires a barrier. |
342 | 2231 } |
2232 | |
2233 size_t G1CollectedHeap::capacity() const { | |
2234 return _g1_committed.byte_size(); | |
2235 } | |
2236 | |
1705 | 2237 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2238 DirtyCardQueue* into_cset_dcq, | |
2239 bool concurrent, | |
342 | 2240 int worker_i) { |
889 | 2241 // Clean cards in the hot card cache |
1705 | 2242 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2243 |
342 | 2244 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2245 int n_completed_buffers = 0; | |
1705 | 2246 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2247 n_completed_buffers++; |
2248 } | |
2249 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2250 (double) n_completed_buffers); | |
2251 dcqs.clear_n_completed_buffers(); | |
2252 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2253 } | |
2254 | |
2255 | |
2256 // Computes the sum of the storage used by the various regions. | |
2257 | |
2258 size_t G1CollectedHeap::used() const { | |
862
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diff
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|
2259 assert(Heap_lock->owner() != NULL, |
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|
2260 "Should be owned on this thread's behalf."); |
342 | 2261 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2262 // Read only once in case it is set to NULL concurrently |
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|
2263 HeapRegion* hr = _mutator_alloc_region.get(); |
845
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|
2264 if (hr != NULL) |
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|
2265 result += hr->used(); |
342 | 2266 return result; |
2267 } | |
2268 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2269 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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|
2270 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2271 return result; |
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|
2272 } |
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|
2273 |
342 | 2274 class SumUsedClosure: public HeapRegionClosure { |
2275 size_t _used; | |
2276 public: | |
2277 SumUsedClosure() : _used(0) {} | |
2278 bool doHeapRegion(HeapRegion* r) { | |
2279 if (!r->continuesHumongous()) { | |
2280 _used += r->used(); | |
2281 } | |
2282 return false; | |
2283 } | |
2284 size_t result() { return _used; } | |
2285 }; | |
2286 | |
2287 size_t G1CollectedHeap::recalculate_used() const { | |
2288 SumUsedClosure blk; | |
3766 | 2289 heap_region_iterate(&blk); |
342 | 2290 return blk.result(); |
2291 } | |
2292 | |
2293 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2294 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2295 // otherwise, is there space in the current allocation region? |
2296 | |
2297 // We need to store the current allocation region in a local variable | |
2298 // here. The problem is that this method doesn't take any locks and | |
2299 // there may be other threads which overwrite the current allocation | |
2300 // region field. attempt_allocation(), for example, sets it to NULL | |
2301 // and this can happen *after* the NULL check here but before the call | |
2302 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2303 // to be a problem in the optimized build, since the two loads of the | |
2304 // current allocation region field are optimized away. | |
2433
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|
2305 HeapRegion* hr = _mutator_alloc_region.get(); |
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|
2306 if (hr == NULL) { |
342 | 2307 return 0; |
2308 } | |
2433
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|
2309 return hr->free(); |
342 | 2310 } |
2311 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2312 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2313 return |
4e5661ba9d98
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1611
diff
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|
2314 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4829
9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
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4787
diff
changeset
|
2315 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent) || |
9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
parents:
4787
diff
changeset
|
2316 cause == GCCause::_g1_humongous_allocation); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2317 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2318 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2319 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2320 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2321 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2322 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2323 // 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
|
2324 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2325 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2326 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2327 // Let's use the existing mechanism for the allocation |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2328 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2329 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2330 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2331 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2332 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2333 // 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
|
2334 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2335 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2336 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2337 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2338 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2339 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2340 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2341 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2342 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2343 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2344 // 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
|
2345 // 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
|
2346 // 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
|
2347 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2348 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2349 // We have already incremented _total_full_collections at the start |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2350 // of the GC, so total_full_collections() represents how many full |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2351 // collections have been started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2352 unsigned int full_collections_started = total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2353 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2354 // Given that this method is called at the end of a Full GC or of a |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2355 // concurrent cycle, and those can be nested (i.e., a Full GC can |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2356 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2357 // completed should be either one (in the case where there was no |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2358 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2359 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2360 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2361 // 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
|
2362 assert(concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2363 (full_collections_started == _full_collections_completed + 1) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2364 (full_collections_started == _full_collections_completed + 2), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2365 err_msg("for inner caller (Full GC): full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2366 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2367 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2368 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2369 // 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
|
2370 assert(!concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2371 (full_collections_started == _full_collections_completed + 1), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2372 err_msg("for outer caller (concurrent cycle): " |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2373 "full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2374 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2375 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2376 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2377 _full_collections_completed += 1; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2378 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2379 // 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
|
2380 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2381 // is set) so that if a waiter requests another System.gc() it doesn't |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2382 // incorrectly see that a marking cyle is still in progress. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2383 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2384 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2385 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2386 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2387 // 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
|
2388 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2389 // 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
|
2390 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2391 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2392 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2393 |
342 | 2394 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2395 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2396 GCCauseSetter gcs(this, cause); |
2397 switch (cause) { | |
2398 case GCCause::_heap_inspection: | |
2399 case GCCause::_heap_dump: { | |
2400 HandleMark hm; | |
2401 do_full_collection(false); // don't clear all soft refs | |
2402 break; | |
2403 } | |
2404 default: // XXX FIX ME | |
2405 ShouldNotReachHere(); // Unexpected use of this function | |
2406 } | |
2407 } | |
2408 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2409 void G1CollectedHeap::collect(GCCause::Cause cause) { |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2410 // The caller doesn't have the Heap_lock |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2411 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2412 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2413 unsigned int gc_count_before; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2414 unsigned int full_gc_count_before; |
342 | 2415 { |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2416 MutexLocker ml(Heap_lock); |
1973 | 2417 |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2418 // Read the GC count while holding the Heap_lock |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2419 gc_count_before = SharedHeap::heap()->total_collections(); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2420 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2421 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2422 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2423 if (should_do_concurrent_full_gc(cause)) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2424 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2425 // concurrent cycle. We're setting word_size to 0 which means that |
2426 // we are not requesting a post-GC allocation. | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2427 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2428 0, /* word_size */ |
2429 true, /* should_initiate_conc_mark */ | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2430 g1_policy()->max_pause_time_ms(), |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2431 cause); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2432 VMThread::execute(&op); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2433 } else { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2434 if (cause == GCCause::_gc_locker |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2435 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2436 |
1973 | 2437 // Schedule a standard evacuation pause. We're setting word_size |
2438 // to 0 which means that we are not requesting a post-GC allocation. | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2439 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2440 0, /* word_size */ |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2441 false, /* should_initiate_conc_mark */ |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2442 g1_policy()->max_pause_time_ms(), |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2443 cause); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2444 VMThread::execute(&op); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2445 } else { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2446 // Schedule a Full GC. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2447 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2448 VMThread::execute(&op); |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2449 } |
342 | 2450 } |
2451 } | |
2452 | |
2453 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2454 if (_g1_committed.contains(p)) { |
2455 // Given that we know that p is in the committed space, | |
2456 // heap_region_containing_raw() should successfully | |
2457 // return the containing region. | |
2458 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2459 return hr->is_in(p); |
2460 } else { | |
2461 return _perm_gen->as_gen()->is_in(p); | |
2462 } | |
2463 } | |
2464 | |
2465 // Iteration functions. | |
2466 | |
2467 // Iterates an OopClosure over all ref-containing fields of objects | |
2468 // within a HeapRegion. | |
2469 | |
2470 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2471 MemRegion _mr; | |
2472 OopClosure* _cl; | |
2473 public: | |
2474 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2475 : _mr(mr), _cl(cl) {} | |
2476 bool doHeapRegion(HeapRegion* r) { | |
2477 if (! r->continuesHumongous()) { | |
2478 r->oop_iterate(_cl); | |
2479 } | |
2480 return false; | |
2481 } | |
2482 }; | |
2483 | |
678 | 2484 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2485 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2486 heap_region_iterate(&blk); |
678 | 2487 if (do_perm) { |
2488 perm_gen()->oop_iterate(cl); | |
2489 } | |
342 | 2490 } |
2491 | |
678 | 2492 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2493 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2494 heap_region_iterate(&blk); |
678 | 2495 if (do_perm) { |
2496 perm_gen()->oop_iterate(cl); | |
2497 } | |
342 | 2498 } |
2499 | |
2500 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2501 | |
2502 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2503 ObjectClosure* _cl; | |
2504 public: | |
2505 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2506 bool doHeapRegion(HeapRegion* r) { | |
2507 if (! r->continuesHumongous()) { | |
2508 r->object_iterate(_cl); | |
2509 } | |
2510 return false; | |
2511 } | |
2512 }; | |
2513 | |
678 | 2514 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2515 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2516 heap_region_iterate(&blk); |
678 | 2517 if (do_perm) { |
2518 perm_gen()->object_iterate(cl); | |
2519 } | |
342 | 2520 } |
2521 | |
2522 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2523 // FIXME: is this right? | |
2524 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2525 } | |
2526 | |
2527 // Calls a SpaceClosure on a HeapRegion. | |
2528 | |
2529 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2530 SpaceClosure* _cl; | |
2531 public: | |
2532 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2533 bool doHeapRegion(HeapRegion* r) { | |
2534 _cl->do_space(r); | |
2535 return false; | |
2536 } | |
2537 }; | |
2538 | |
2539 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2540 SpaceClosureRegionClosure blk(cl); | |
3766 | 2541 heap_region_iterate(&blk); |
342 | 2542 } |
2543 | |
3766 | 2544 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2545 _hrs.iterate(cl); | |
342 | 2546 } |
2547 | |
2548 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2549 HeapRegionClosure* cl) const { |
2550 _hrs.iterate_from(r, cl); | |
342 | 2551 } |
2552 | |
2553 void | |
2554 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
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2555 uint worker, |
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2556 uint no_of_par_workers, |
342 | 2557 jint claim_value) { |
355 | 2558 const size_t regions = n_regions(); |
4728
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2559 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2560 no_of_par_workers : |
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2561 1); |
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2562 assert(UseDynamicNumberOfGCThreads || |
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2563 no_of_par_workers == workers()->total_workers(), |
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2564 "Non dynamic should use fixed number of workers"); |
355 | 2565 // try to spread out the starting points of the workers |
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2566 const size_t start_index = regions / max_workers * (size_t) worker; |
355 | 2567 |
2568 // each worker will actually look at all regions | |
2569 for (size_t count = 0; count < regions; ++count) { | |
2570 const size_t index = (start_index + count) % regions; | |
2571 assert(0 <= index && index < regions, "sanity"); | |
2572 HeapRegion* r = region_at(index); | |
2573 // we'll ignore "continues humongous" regions (we'll process them | |
2574 // when we come across their corresponding "start humongous" | |
2575 // region) and regions already claimed | |
2576 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2577 continue; | |
2578 } | |
2579 // OK, try to claim it | |
342 | 2580 if (r->claimHeapRegion(claim_value)) { |
355 | 2581 // success! |
2582 assert(!r->continuesHumongous(), "sanity"); | |
2583 if (r->startsHumongous()) { | |
2584 // If the region is "starts humongous" we'll iterate over its | |
2585 // "continues humongous" first; in fact we'll do them | |
2586 // first. The order is important. In on case, calling the | |
2587 // closure on the "starts humongous" region might de-allocate | |
2588 // and clear all its "continues humongous" regions and, as a | |
2589 // result, we might end up processing them twice. So, we'll do | |
2590 // them first (notice: most closures will ignore them anyway) and | |
2591 // then we'll do the "starts humongous" region. | |
2592 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2593 HeapRegion* chr = region_at(ch_index); | |
2594 | |
2595 // if the region has already been claimed or it's not | |
2596 // "continues humongous" we're done | |
2597 if (chr->claim_value() == claim_value || | |
2598 !chr->continuesHumongous()) { | |
2599 break; | |
2600 } | |
2601 | |
2602 // Noone should have claimed it directly. We can given | |
2603 // that we claimed its "starts humongous" region. | |
2604 assert(chr->claim_value() != claim_value, "sanity"); | |
2605 assert(chr->humongous_start_region() == r, "sanity"); | |
2606 | |
2607 if (chr->claimHeapRegion(claim_value)) { | |
2608 // we should always be able to claim it; noone else should | |
2609 // be trying to claim this region | |
2610 | |
2611 bool res2 = cl->doHeapRegion(chr); | |
2612 assert(!res2, "Should not abort"); | |
2613 | |
2614 // Right now, this holds (i.e., no closure that actually | |
2615 // does something with "continues humongous" regions | |
2616 // clears them). We might have to weaken it in the future, | |
2617 // but let's leave these two asserts here for extra safety. | |
2618 assert(chr->continuesHumongous(), "should still be the case"); | |
2619 assert(chr->humongous_start_region() == r, "sanity"); | |
2620 } else { | |
2621 guarantee(false, "we should not reach here"); | |
2622 } | |
2623 } | |
2624 } | |
2625 | |
2626 assert(!r->continuesHumongous(), "sanity"); | |
2627 bool res = cl->doHeapRegion(r); | |
2628 assert(!res, "Should not abort"); | |
2629 } | |
2630 } | |
2631 } | |
2632 | |
390 | 2633 class ResetClaimValuesClosure: public HeapRegionClosure { |
2634 public: | |
2635 bool doHeapRegion(HeapRegion* r) { | |
2636 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2637 return false; | |
2638 } | |
2639 }; | |
2640 | |
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2641 void G1CollectedHeap::reset_heap_region_claim_values() { |
390 | 2642 ResetClaimValuesClosure blk; |
2643 heap_region_iterate(&blk); | |
2644 } | |
2645 | |
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2646 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2647 ResetClaimValuesClosure blk; |
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2648 collection_set_iterate(&blk); |
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2649 } |
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2650 |
355 | 2651 #ifdef ASSERT |
2652 // This checks whether all regions in the heap have the correct claim | |
2653 // value. I also piggy-backed on this a check to ensure that the | |
2654 // humongous_start_region() information on "continues humongous" | |
2655 // regions is correct. | |
2656 | |
2657 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2658 private: | |
2659 jint _claim_value; | |
2660 size_t _failures; | |
2661 HeapRegion* _sh_region; | |
2662 public: | |
2663 CheckClaimValuesClosure(jint claim_value) : | |
2664 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2665 bool doHeapRegion(HeapRegion* r) { | |
2666 if (r->claim_value() != _claim_value) { | |
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2667 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2668 "claim value = %d, should be %d", |
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2669 HR_FORMAT_PARAMS(r), |
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2670 r->claim_value(), _claim_value); |
355 | 2671 ++_failures; |
2672 } | |
2673 if (!r->isHumongous()) { | |
2674 _sh_region = NULL; | |
2675 } else if (r->startsHumongous()) { | |
2676 _sh_region = r; | |
2677 } else if (r->continuesHumongous()) { | |
2678 if (r->humongous_start_region() != _sh_region) { | |
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2679 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2680 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2681 HR_FORMAT_PARAMS(r), |
355 | 2682 r->humongous_start_region(), |
2683 _sh_region); | |
2684 ++_failures; | |
342 | 2685 } |
2686 } | |
355 | 2687 return false; |
2688 } | |
2689 size_t failures() { | |
2690 return _failures; | |
2691 } | |
2692 }; | |
2693 | |
2694 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2695 CheckClaimValuesClosure cl(claim_value); | |
2696 heap_region_iterate(&cl); | |
2697 return cl.failures() == 0; | |
2698 } | |
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2699 |
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2700 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2701 jint _claim_value; |
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2702 size_t _failures; |
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2703 |
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2704 public: |
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2705 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2706 _claim_value(claim_value), |
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2707 _failures(0) { } |
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2708 |
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2709 size_t failures() { |
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2710 return _failures; |
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2711 } |
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2712 |
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2713 bool doHeapRegion(HeapRegion* hr) { |
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2714 assert(hr->in_collection_set(), "how?"); |
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2715 assert(!hr->isHumongous(), "H-region in CSet"); |
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2716 if (hr->claim_value() != _claim_value) { |
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2717 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2718 "claim value = %d, should be %d", |
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2719 HR_FORMAT_PARAMS(hr), |
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2720 hr->claim_value(), _claim_value); |
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2721 _failures += 1; |
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2722 } |
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2723 return false; |
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2724 } |
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2725 }; |
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2726 |
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2727 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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2728 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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2729 collection_set_iterate(&cl); |
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2730 return cl.failures() == 0; |
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2731 } |
355 | 2732 #endif // ASSERT |
342 | 2733 |
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2734 // Clear the cached CSet starting regions and (more importantly) |
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2735 // the time stamps. Called when we reset the GC time stamp. |
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2736 void G1CollectedHeap::clear_cset_start_regions() { |
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2737 assert(_worker_cset_start_region != NULL, "sanity"); |
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2738 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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2739 |
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2740 int n_queues = MAX2((int)ParallelGCThreads, 1); |
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2741 for (int i = 0; i < n_queues; i++) { |
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2742 _worker_cset_start_region[i] = NULL; |
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2743 _worker_cset_start_region_time_stamp[i] = 0; |
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2744 } |
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2745 } |
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2746 |
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2747 // Given the id of a worker, obtain or calculate a suitable |
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2748 // starting region for iterating over the current collection set. |
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2749 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
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2750 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
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2751 |
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2752 HeapRegion* result = NULL; |
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2753 unsigned gc_time_stamp = get_gc_time_stamp(); |
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2754 |
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2755 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
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johnc
parents:
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diff
changeset
|
2756 // Cached starting region for current worker was set |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2757 // during the current pause - so it's valid. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2758 // Note: the cached starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2759 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2760 result = _worker_cset_start_region[worker_i]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2761 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
|
2762 return result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2763 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2764 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2765 // 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
|
2766 // 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
|
2767 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2768 // 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
|
2769 // 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
|
2770 // avoid contention. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2771 // If we have: |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2772 // n collection set regions |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2773 // p threads |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2774 // 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
|
2775 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2776 result = g1_policy()->collection_set(); |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2777 if (G1CollectedHeap::use_parallel_gc_threads()) { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2778 size_t 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
|
2779 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
|
2780 assert(UseDynamicNumberOfGCThreads || |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2781 active_workers == workers()->total_workers(), |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2782 "Unless dynamic should use total workers"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2783 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2784 size_t end_ind = (cs_size * worker_i) / active_workers; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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diff
changeset
|
2785 size_t start_ind = 0; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2786 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2787 if (worker_i > 0 && |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2788 _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
|
2789 // Previous workers starting region is valid |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2790 // so let's iterate from there |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2791 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
|
2792 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
|
2793 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2794 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2795 for (size_t i = start_ind; i < end_ind; i++) { |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2796 result = result->next_in_collection_set(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2797 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2798 } |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2799 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2800 // 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
|
2801 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2802 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
|
2803 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
|
2804 "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
|
2805 _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
|
2806 OrderAccess::storestore(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2807 _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
|
2808 return result; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2809 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
2810 |
342 | 2811 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2812 HeapRegion* r = g1_policy()->collection_set(); | |
2813 while (r != NULL) { | |
2814 HeapRegion* next = r->next_in_collection_set(); | |
2815 if (cl->doHeapRegion(r)) { | |
2816 cl->incomplete(); | |
2817 return; | |
2818 } | |
2819 r = next; | |
2820 } | |
2821 } | |
2822 | |
2823 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2824 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2825 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2826 // 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
|
2827 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2828 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2829 |
342 | 2830 assert(r->in_collection_set(), |
2831 "Start region must be a member of the collection set."); | |
2832 HeapRegion* cur = r; | |
2833 while (cur != NULL) { | |
2834 HeapRegion* next = cur->next_in_collection_set(); | |
2835 if (cl->doHeapRegion(cur) && false) { | |
2836 cl->incomplete(); | |
2837 return; | |
2838 } | |
2839 cur = next; | |
2840 } | |
2841 cur = g1_policy()->collection_set(); | |
2842 while (cur != r) { | |
2843 HeapRegion* next = cur->next_in_collection_set(); | |
2844 if (cl->doHeapRegion(cur) && false) { | |
2845 cl->incomplete(); | |
2846 return; | |
2847 } | |
2848 cur = next; | |
2849 } | |
2850 } | |
2851 | |
2852 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2853 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2854 } |
2855 | |
2856 | |
2857 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2858 Space* res = heap_region_containing(addr); | |
2859 if (res == NULL) | |
2860 res = perm_gen()->space_containing(addr); | |
2861 return res; | |
2862 } | |
2863 | |
2864 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2865 Space* sp = space_containing(addr); | |
2866 if (sp != NULL) { | |
2867 return sp->block_start(addr); | |
2868 } | |
2869 return NULL; | |
2870 } | |
2871 | |
2872 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2873 Space* sp = space_containing(addr); | |
2874 assert(sp != NULL, "block_size of address outside of heap"); | |
2875 return sp->block_size(addr); | |
2876 } | |
2877 | |
2878 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2879 Space* sp = space_containing(addr); | |
2880 return sp->block_is_obj(addr); | |
2881 } | |
2882 | |
2883 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2884 return true; | |
2885 } | |
2886 | |
2887 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2888 return HeapRegion::GrainBytes; | |
2889 } | |
2890 | |
2891 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2892 // Return the remaining space in the cur alloc region, but not less than | |
2893 // the min TLAB size. | |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2894 |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2895 // Also, this value can be at most the humongous object threshold, |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2896 // since we can't allow tlabs to grow big enough to accomodate |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2897 // humongous objects. |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2898 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2899 HeapRegion* hr = _mutator_alloc_region.get(); |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2900 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
|
2901 if (hr == NULL) { |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2902 return max_tlab_size; |
342 | 2903 } else { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2904 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2905 } |
2906 } | |
2907 | |
2908 size_t G1CollectedHeap::max_capacity() const { | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2909 return _g1_reserved.byte_size(); |
342 | 2910 } |
2911 | |
2912 jlong G1CollectedHeap::millis_since_last_gc() { | |
2913 // assert(false, "NYI"); | |
2914 return 0; | |
2915 } | |
2916 | |
2917 void G1CollectedHeap::prepare_for_verify() { | |
2918 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2919 ensure_parsability(false); | |
2920 } | |
2921 g1_rem_set()->prepare_for_verify(); | |
2922 } | |
2923 | |
2924 class VerifyLivenessOopClosure: public OopClosure { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2925 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2926 VerifyOption _vo; |
342 | 2927 public: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2928 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2929 _g1h(g1h), _vo(vo) |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2930 { } |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2931 void do_oop(narrowOop *p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2932 void do_oop( oop *p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2933 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2934 template <class T> void do_oop_work(T *p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2935 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2936 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2937 "Dead object referenced by a not dead object"); |
342 | 2938 } |
2939 }; | |
2940 | |
2941 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2942 private: |
342 | 2943 G1CollectedHeap* _g1h; |
2944 size_t _live_bytes; | |
2945 HeapRegion *_hr; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2946 VerifyOption _vo; |
342 | 2947 public: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2948 // _vo == UsePrevMarking -> use "prev" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2949 // _vo == UseNextMarking -> use "next" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2950 // _vo == UseMarkWord -> use mark word from object header. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2951 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2952 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2953 _g1h = G1CollectedHeap::heap(); |
2954 } | |
2955 void do_object(oop o) { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2956 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2957 assert(o != NULL, "Huh?"); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2958 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2959 // If the object is alive according to the mark word, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2960 // then verify that the marking information agrees. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2961 // Note we can't verify the contra-positive of the |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2962 // above: if the object is dead (according to the mark |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2963 // word), it may not be marked, or may have been marked |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2964 // but has since became dead, or may have been allocated |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2965 // since the last marking. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2966 if (_vo == VerifyOption_G1UseMarkWord) { |
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2967 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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2968 } |
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2969 |
342 | 2970 o->oop_iterate(&isLive); |
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2971 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2972 size_t obj_size = o->size(); // Make sure we don't overflow |
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2973 _live_bytes += (obj_size * HeapWordSize); |
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2974 } |
342 | 2975 } |
2976 } | |
2977 size_t live_bytes() { return _live_bytes; } | |
2978 }; | |
2979 | |
2980 class PrintObjsInRegionClosure : public ObjectClosure { | |
2981 HeapRegion *_hr; | |
2982 G1CollectedHeap *_g1; | |
2983 public: | |
2984 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2985 _g1 = G1CollectedHeap::heap(); | |
2986 }; | |
2987 | |
2988 void do_object(oop o) { | |
2989 if (o != NULL) { | |
2990 HeapWord *start = (HeapWord *) o; | |
2991 size_t word_sz = o->size(); | |
2992 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2993 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2994 (void*) o, word_sz, | |
2995 _g1->isMarkedPrev(o), | |
2996 _g1->isMarkedNext(o), | |
2997 _hr->obj_allocated_since_prev_marking(o)); | |
2998 HeapWord *end = start + word_sz; | |
2999 HeapWord *cur; | |
3000 int *val; | |
3001 for (cur = start; cur < end; cur++) { | |
3002 val = (int *) cur; | |
3003 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
3004 } | |
3005 } | |
3006 } | |
3007 }; | |
3008 | |
3009 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 3010 private: |
3772
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3011 bool _allow_dirty; |
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3012 bool _par; |
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3013 VerifyOption _vo; |
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3014 bool _failures; |
811 | 3015 public: |
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3016 // _vo == UsePrevMarking -> use "prev" marking information, |
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3017 // _vo == UseNextMarking -> use "next" marking information, |
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3018 // _vo == UseMarkWord -> use mark word from object header. |
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3019 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
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3020 : _allow_dirty(allow_dirty), |
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3021 _par(par), |
3772
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3022 _vo(vo), |
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3023 _failures(false) {} |
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3024 |
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3025 bool failures() { |
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|
3026 return _failures; |
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|
3027 } |
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3028 |
342 | 3029 bool doHeapRegion(HeapRegion* r) { |
390 | 3030 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
3031 "Should be unclaimed at verify points."); | |
637
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|
3032 if (!r->continuesHumongous()) { |
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3033 bool failures = false; |
3772
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3034 r->verify(_allow_dirty, _vo, &failures); |
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3035 if (failures) { |
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|
3036 _failures = true; |
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|
3037 } else { |
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|
3038 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
1020
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|
3039 r->object_iterate(¬_dead_yet_cl); |
4787
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|
3040 if (_vo != VerifyOption_G1UseNextMarking) { |
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|
3041 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
3042 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
3043 "max_live_bytes "SIZE_FORMAT" " |
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|
3044 "< calculated "SIZE_FORMAT, |
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|
3045 r->bottom(), r->end(), |
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|
3046 r->max_live_bytes(), |
1020
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|
3047 not_dead_yet_cl.live_bytes()); |
4787
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|
3048 _failures = true; |
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|
3049 } |
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|
3050 } else { |
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changeset
|
3051 // When vo == UseNextMarking we cannot currently do a sanity |
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|
3052 // check on the live bytes as the calculation has not been |
2ace1c4ee8da
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|
3053 // finalized yet. |
1020
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|
3054 } |
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|
3055 } |
342 | 3056 } |
1020
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|
3057 return false; // stop the region iteration if we hit a failure |
342 | 3058 } |
3059 }; | |
3060 | |
3061 class VerifyRootsClosure: public OopsInGenClosure { | |
3062 private: | |
3063 G1CollectedHeap* _g1h; | |
3772
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|
3064 VerifyOption _vo; |
342 | 3065 bool _failures; |
3066 public: | |
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|
3067 // _vo == UsePrevMarking -> use "prev" marking information, |
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|
3068 // _vo == UseNextMarking -> use "next" marking information, |
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|
3069 // _vo == UseMarkWord -> use mark word from object header. |
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|
3070 VerifyRootsClosure(VerifyOption vo) : |
845
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3071 _g1h(G1CollectedHeap::heap()), |
3772
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changeset
|
3072 _vo(vo), |
1020
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|
3073 _failures(false) { } |
342 | 3074 |
3075 bool failures() { return _failures; } | |
3076 | |
845
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|
3077 template <class T> void do_oop_nv(T* p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
3078 T heap_oop = oopDesc::load_heap_oop(p); |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
3079 if (!oopDesc::is_null(heap_oop)) { |
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|
3080 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
3772
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|
3081 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 3082 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
1020
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changeset
|
3083 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
3772
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|
3084 if (_vo == VerifyOption_G1UseMarkWord) { |
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diff
changeset
|
3085 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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|
3086 } |
342 | 3087 obj->print_on(gclog_or_tty); |
3088 _failures = true; | |
3089 } | |
3090 } | |
3091 } | |
845
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diff
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|
3092 |
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|
3093 void do_oop(oop* p) { do_oop_nv(p); } |
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|
3094 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 3095 }; |
3096 | |
390 | 3097 // This is the task used for parallel heap verification. |
3098 | |
3099 class G1ParVerifyTask: public AbstractGangTask { | |
3100 private: | |
3101 G1CollectedHeap* _g1h; | |
3772
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|
3102 bool _allow_dirty; |
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|
3103 VerifyOption _vo; |
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changeset
|
3104 bool _failures; |
390 | 3105 |
3106 public: | |
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|
3107 // _vo == UsePrevMarking -> use "prev" marking information, |
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|
3108 // _vo == UseNextMarking -> use "next" marking information, |
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changeset
|
3109 // _vo == UseMarkWord -> use mark word from object header. |
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|
3110 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 3111 AbstractGangTask("Parallel verify task"), |
845
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|
3112 _g1h(g1h), |
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|
3113 _allow_dirty(allow_dirty), |
3772
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|
3114 _vo(vo), |
1020
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|
3115 _failures(false) { } |
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|
3116 |
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|
3117 bool failures() { |
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|
3118 return _failures; |
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|
3119 } |
390 | 3120 |
4728
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|
3121 void work(uint worker_id) { |
637
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|
3122 HandleMark hm; |
3772
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|
3123 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
4728
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|
3124 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
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|
3125 _g1h->workers()->active_workers(), |
390 | 3126 HeapRegion::ParVerifyClaimValue); |
1020
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|
3127 if (blk.failures()) { |
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|
3128 _failures = true; |
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|
3129 } |
390 | 3130 } |
3131 }; | |
3132 | |
342 | 3133 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
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|
3134 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 3135 } |
3136 | |
3137 void G1CollectedHeap::verify(bool allow_dirty, | |
3138 bool silent, | |
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|
3139 VerifyOption vo) { |
342 | 3140 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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|
3141 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
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|
3142 VerifyRootsClosure rootsCl(vo); |
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|
3143 |
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|
3144 assert(Thread::current()->is_VM_thread(), |
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|
3145 "Expected to be executed serially by the VM thread at this point"); |
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|
3146 |
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diff
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|
3147 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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|
3148 |
3293
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|
3149 // We apply the relevant closures to all the oops in the |
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|
3150 // system dictionary, the string table and the code cache. |
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|
3151 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
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|
3152 |
3293
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|
3153 process_strong_roots(true, // activate StrongRootsScope |
1f4413413144
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|
3154 true, // we set "collecting perm gen" to true, |
1f4413413144
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diff
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|
3155 // so we don't reset the dirty cards in the perm gen. |
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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diff
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|
3156 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 3157 &rootsCl, |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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diff
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|
3158 &blobsCl, |
342 | 3159 &rootsCl); |
3772
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7004681: G1: Extend marking verification to Full GCs
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|
3160 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3161 // If we're verifying after the marking phase of a Full GC then we can't |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3162 // treat the perm gen as roots into the G1 heap. Some of the objects in |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
3163 // the perm gen may be dead and hence not marked. If one of these dead |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
3164 // objects is considered to be a root then we may end up with a false |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3165 // "Root location <x> points to dead ob <y>" failure. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3166 if (vo != VerifyOption_G1UseMarkWord) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
3167 // Since we used "collecting_perm_gen" == true above, we will not have |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3168 // checked the refs from perm into the G1-collected heap. We check those |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
3169 // references explicitly below. Whether the relevant cards are dirty |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3170 // is checked further below in the rem set verification. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
3171 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3172 perm_gen()->oop_iterate(&rootsCl); |
6747fd0512e0
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diff
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|
3173 } |
1020
ff2402f6a50b
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|
3174 bool failures = rootsCl.failures(); |
3772
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|
3175 |
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7004681: G1: Extend marking verification to Full GCs
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|
3176 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3177 // If we're verifying during a full GC then the region sets |
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|
3178 // will have been torn down at the start of the GC. Therefore |
6747fd0512e0
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|
3179 // verifying the region sets will fail. So we only verify |
6747fd0512e0
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|
3180 // the region sets when not in a full GC. |
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|
3181 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
6747fd0512e0
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|
3182 verify_region_sets(); |
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|
3183 } |
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|
3184 |
2152 | 3185 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3186 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3187 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3188 "sanity check"); | |
3189 | |
3772
6747fd0512e0
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|
3190 G1ParVerifyTask task(this, allow_dirty, vo); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
3191 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3192 workers()->active_workers() == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3193 "If not dynamic should be using all the workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3194 int n_workers = workers()->active_workers(); |
390 | 3195 set_par_threads(n_workers); |
3196 workers()->run_task(&task); | |
3197 set_par_threads(0); | |
1020
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|
3198 if (task.failures()) { |
ff2402f6a50b
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|
3199 failures = true; |
ff2402f6a50b
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|
3200 } |
390 | 3201 |
4095
bca17e38de00
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|
3202 // Checks that the expected amount of parallel work was done. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
3203 // The implication is that n_workers is > 0. |
390 | 3204 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3205 "sanity check"); | |
3206 | |
3207 reset_heap_region_claim_values(); | |
3208 | |
3209 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3210 "sanity check"); | |
3211 } else { | |
3772
6747fd0512e0
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diff
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|
3212 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 3213 heap_region_iterate(&blk); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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diff
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|
3214 if (blk.failures()) { |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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diff
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|
3215 failures = true; |
ff2402f6a50b
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diff
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|
3216 } |
390 | 3217 } |
2152 | 3218 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3219 rem_set()->verify(); |
1020
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|
3220 |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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|
3221 if (failures) { |
ff2402f6a50b
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|
3222 gclog_or_tty->print_cr("Heap:"); |
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3223 // It helps to have the per-region information in the output to |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3224 // help us track down what went wrong. This is why we call |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
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|
3225 // print_extended_on() instead of print_on(). |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
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|
3226 print_extended_on(gclog_or_tty); |
1020
ff2402f6a50b
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diff
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|
3227 gclog_or_tty->print_cr(""); |
1547
fb1a39993f69
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jcoomes
parents:
1545
diff
changeset
|
3228 #ifndef PRODUCT |
1044 | 3229 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3230 concurrent_mark()->print_reachable("at-verification-failure", |
3772
6747fd0512e0
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diff
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|
3231 vo, false /* all */); |
1020
ff2402f6a50b
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diff
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|
3232 } |
1547
fb1a39993f69
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jcoomes
parents:
1545
diff
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|
3233 #endif |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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diff
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|
3234 gclog_or_tty->flush(); |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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diff
changeset
|
3235 } |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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diff
changeset
|
3236 guarantee(!failures, "there should not have been any failures"); |
342 | 3237 } else { |
3238 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3239 } | |
3240 } | |
3241 | |
3242 class PrintRegionClosure: public HeapRegionClosure { | |
3243 outputStream* _st; | |
3244 public: | |
3245 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3246 bool doHeapRegion(HeapRegion* r) { | |
3247 r->print_on(_st); | |
3248 return false; | |
3249 } | |
3250 }; | |
3251 | |
3252 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3253 st->print(" %-20s", "garbage-first heap"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3254 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
3255 capacity()/K, used_unlocked()/K); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3256 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3257 _g1_storage.low_boundary(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3258 _g1_storage.high(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3259 _g1_storage.high_boundary()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3260 st->cr(); |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3261 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3262 size_t young_regions = _young_list->length(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3263 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
changeset
|
3264 young_regions, young_regions * HeapRegion::GrainBytes / K); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3265 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3266 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3267 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3268 st->cr(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3269 perm()->as_gen()->print_on(st); |
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
changeset
|
3270 } |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3271 |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
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|
3272 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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parents:
4072
diff
changeset
|
3273 print_on(st); |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3274 |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
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|
3275 // Print the per-region information. |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3276 st->cr(); |
53074c2c4600
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changeset
|
3277 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), HS=humongous(starts), HC=humongous(continues), CS=collection set, F=free, TS=gc time stamp, PTAMS=previous top-at-mark-start, NTAMS=next top-at-mark-start)"); |
342 | 3278 PrintRegionClosure blk(st); |
3766 | 3279 heap_region_iterate(&blk); |
342 | 3280 } |
3281 | |
3282 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3283 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3284 workers()->print_worker_threads_on(st); |
3285 } | |
3286 _cmThread->print_on(st); | |
342 | 3287 st->cr(); |
1019 | 3288 _cm->print_worker_threads_on(st); |
3289 _cg1r->print_worker_threads_on(st); | |
342 | 3290 st->cr(); |
3291 } | |
3292 | |
3293 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3294 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3295 workers()->threads_do(tc); |
3296 } | |
3297 tc->do_thread(_cmThread); | |
794 | 3298 _cg1r->threads_do(tc); |
342 | 3299 } |
3300 | |
3301 void G1CollectedHeap::print_tracing_info() const { | |
3302 // We'll overload this to mean "trace GC pause statistics." | |
3303 if (TraceGen0Time || TraceGen1Time) { | |
3304 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3305 // to that. | |
3306 g1_policy()->print_tracing_info(); | |
3307 } | |
751 | 3308 if (G1SummarizeRSetStats) { |
342 | 3309 g1_rem_set()->print_summary_info(); |
3310 } | |
1282 | 3311 if (G1SummarizeConcMark) { |
342 | 3312 concurrent_mark()->print_summary_info(); |
3313 } | |
3314 g1_policy()->print_yg_surv_rate_info(); | |
3315 SpecializationStats::print(); | |
3316 } | |
3317 | |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
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|
3318 #ifndef PRODUCT |
e8b0b0392037
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3774
diff
changeset
|
3319 // Helpful for debugging RSet issues. |
e8b0b0392037
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tonyp
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diff
changeset
|
3320 |
e8b0b0392037
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diff
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|
3321 class PrintRSetsClosure : public HeapRegionClosure { |
e8b0b0392037
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tonyp
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3774
diff
changeset
|
3322 private: |
e8b0b0392037
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diff
changeset
|
3323 const char* _msg; |
e8b0b0392037
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3774
diff
changeset
|
3324 size_t _occupied_sum; |
e8b0b0392037
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3774
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changeset
|
3325 |
e8b0b0392037
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diff
changeset
|
3326 public: |
e8b0b0392037
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diff
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|
3327 bool doHeapRegion(HeapRegion* r) { |
e8b0b0392037
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tonyp
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3774
diff
changeset
|
3328 HeapRegionRemSet* hrrs = r->rem_set(); |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3329 size_t occupied = hrrs->occupied(); |
e8b0b0392037
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3774
diff
changeset
|
3330 _occupied_sum += occupied; |
e8b0b0392037
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diff
changeset
|
3331 |
e8b0b0392037
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parents:
3774
diff
changeset
|
3332 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
e8b0b0392037
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tonyp
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3774
diff
changeset
|
3333 HR_FORMAT_PARAMS(r)); |
e8b0b0392037
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3774
diff
changeset
|
3334 if (occupied == 0) { |
e8b0b0392037
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3774
diff
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|
3335 gclog_or_tty->print_cr(" RSet is empty"); |
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|
3336 } else { |
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|
3337 hrrs->print(); |
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|
3338 } |
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|
3339 gclog_or_tty->print_cr("----------"); |
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3340 return false; |
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|
3341 } |
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|
3342 |
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3343 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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|
3344 gclog_or_tty->cr(); |
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|
3345 gclog_or_tty->print_cr("========================================"); |
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3346 gclog_or_tty->print_cr(msg); |
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|
3347 gclog_or_tty->cr(); |
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|
3348 } |
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|
3349 |
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|
3350 ~PrintRSetsClosure() { |
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3351 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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3352 gclog_or_tty->print_cr("========================================"); |
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|
3353 gclog_or_tty->cr(); |
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|
3354 } |
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|
3355 }; |
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|
3356 |
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3357 void G1CollectedHeap::print_cset_rsets() { |
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3358 PrintRSetsClosure cl("Printing CSet RSets"); |
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|
3359 collection_set_iterate(&cl); |
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|
3360 } |
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|
3361 |
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3362 void G1CollectedHeap::print_all_rsets() { |
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3363 PrintRSetsClosure cl("Printing All RSets");; |
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|
3364 heap_region_iterate(&cl); |
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|
3365 } |
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|
3366 #endif // PRODUCT |
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3367 |
342 | 3368 G1CollectedHeap* G1CollectedHeap::heap() { |
3369 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3370 "not a garbage-first heap"); | |
3371 return _g1h; | |
3372 } | |
3373 | |
3374 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3375 // always_do_update_barrier = false; |
342 | 3376 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3377 // Call allocation profiler | |
3378 AllocationProfiler::iterate_since_last_gc(); | |
3379 // Fill TLAB's and such | |
3380 ensure_parsability(true); | |
3381 } | |
3382 | |
3383 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3384 // FIXME: what is this about? | |
3385 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3386 // is set. | |
3387 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3388 "derived pointer present")); | |
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3389 // always_do_update_barrier = true; |
3979
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6484982: G1: process references during evacuation pauses
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|
3390 |
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6484982: G1: process references during evacuation pauses
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|
3391 // We have just completed a GC. Update the soft reference |
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6484982: G1: process references during evacuation pauses
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|
3392 // policy with the new heap occupancy |
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|
3393 Universe::update_heap_info_at_gc(); |
342 | 3394 } |
3395 | |
1973 | 3396 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3397 unsigned int gc_count_before, | |
3398 bool* succeeded) { | |
3399 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3400 g1_policy()->record_stop_world_start(); |
1973 | 3401 VM_G1IncCollectionPause op(gc_count_before, |
3402 word_size, | |
3403 false, /* should_initiate_conc_mark */ | |
3404 g1_policy()->max_pause_time_ms(), | |
3405 GCCause::_g1_inc_collection_pause); | |
3406 VMThread::execute(&op); | |
3407 | |
3408 HeapWord* result = op.result(); | |
3409 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3410 assert(result == NULL || ret_succeeded, | |
3411 "the result should be NULL if the VM did not succeed"); | |
3412 *succeeded = ret_succeeded; | |
3413 | |
3414 assert_heap_not_locked(); | |
3415 return result; | |
342 | 3416 } |
3417 | |
3418 void | |
3419 G1CollectedHeap::doConcurrentMark() { | |
845
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3420 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3421 if (!_cmThread->in_progress()) { |
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3422 _cmThread->set_started(); |
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3423 CGC_lock->notify(); |
342 | 3424 } |
3425 } | |
3426 | |
3427 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3428 bool young) { | |
3429 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3430 } | |
3431 | |
3432 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3433 predicted_time_ms) { | |
3434 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3435 } | |
3436 | |
3437 size_t G1CollectedHeap::pending_card_num() { | |
3438 size_t extra_cards = 0; | |
3439 JavaThread *curr = Threads::first(); | |
3440 while (curr != NULL) { | |
3441 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3442 extra_cards += dcq.size(); | |
3443 curr = curr->next(); | |
3444 } | |
3445 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3446 size_t buffer_size = dcqs.buffer_size(); | |
3447 size_t buffer_num = dcqs.completed_buffers_num(); | |
3448 return buffer_size * buffer_num + extra_cards; | |
3449 } | |
3450 | |
3451 size_t G1CollectedHeap::max_pending_card_num() { | |
3452 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3453 size_t buffer_size = dcqs.buffer_size(); | |
3454 size_t buffer_num = dcqs.completed_buffers_num(); | |
3455 int thread_num = Threads::number_of_threads(); | |
3456 return (buffer_num + thread_num) * buffer_size; | |
3457 } | |
3458 | |
3459 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3460 return g1_rem_set()->cardsScanned(); |
342 | 3461 } |
3462 | |
3463 void | |
3464 G1CollectedHeap::setup_surviving_young_words() { | |
3465 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
4090
a88de71c4e3a
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|
3466 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3467 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
3468 if (_surviving_young_words == NULL) { | |
3469 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3470 "Not enough space for young surv words summary."); | |
3471 } | |
3472 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
845
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|
3473 #ifdef ASSERT |
342 | 3474 for (size_t i = 0; i < array_length; ++i) { |
845
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3475 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3476 } |
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|
3477 #endif // !ASSERT |
342 | 3478 } |
3479 | |
3480 void | |
3481 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3482 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
4090
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|
3483 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3484 for (size_t i = 0; i < array_length; ++i) |
3485 _surviving_young_words[i] += surv_young_words[i]; | |
3486 } | |
3487 | |
3488 void | |
3489 G1CollectedHeap::cleanup_surviving_young_words() { | |
3490 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3491 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3492 _surviving_young_words = NULL; | |
3493 } | |
3494 | |
3777
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|
3495 #ifdef ASSERT |
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|
3496 class VerifyCSetClosure: public HeapRegionClosure { |
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diff
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|
3497 public: |
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diff
changeset
|
3498 bool doHeapRegion(HeapRegion* hr) { |
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diff
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|
3499 // Here we check that the CSet region's RSet is ready for parallel |
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diff
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|
3500 // iteration. The fields that we'll verify are only manipulated |
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diff
changeset
|
3501 // when the region is part of a CSet and is collected. Afterwards, |
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changeset
|
3502 // we reset these fields when we clear the region's RSet (when the |
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diff
changeset
|
3503 // region is freed) so they are ready when the region is |
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changeset
|
3504 // re-allocated. The only exception to this is if there's an |
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diff
changeset
|
3505 // evacuation failure and instead of freeing the region we leave |
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diff
changeset
|
3506 // it in the heap. In that case, we reset these fields during |
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diff
changeset
|
3507 // evacuation failure handling. |
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changeset
|
3508 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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|
3509 |
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diff
changeset
|
3510 // Here's a good place to add any other checks we'd like to |
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diff
changeset
|
3511 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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parents:
1245
diff
changeset
|
3512 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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1245
diff
changeset
|
3513 } |
0414c1049f15
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diff
changeset
|
3514 }; |
3777
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diff
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|
3515 #endif // ASSERT |
1261
0414c1049f15
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diff
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|
3516 |
1709 | 3517 #if TASKQUEUE_STATS |
3518 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3519 st->print_raw_cr("GC Task Stats"); | |
3520 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3521 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3522 } | |
3523 | |
3524 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3525 print_taskqueue_stats_hdr(st); | |
3526 | |
3527 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3528 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3529 for (int i = 0; i < n; ++i) { |
3530 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3531 totals += task_queue(i)->stats; | |
3532 } | |
3533 st->print_raw("tot "); totals.print(st); st->cr(); | |
3534 | |
3535 DEBUG_ONLY(totals.verify()); | |
3536 } | |
3537 | |
3538 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3539 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3540 for (int i = 0; i < n; ++i) { |
3541 task_queue(i)->stats.reset(); | |
3542 } | |
3543 } | |
3544 #endif // TASKQUEUE_STATS | |
3545 | |
1973 | 3546 bool |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3547 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3548 assert_at_safepoint(true /* should_be_vm_thread */); |
3549 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3550 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3551 if (GC_locker::check_active_before_gc()) { |
1973 | 3552 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3553 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3554 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3555 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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2038
diff
changeset
|
3556 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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2038
diff
changeset
|
3557 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3558 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3559 Universe::print_heap_before_gc(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3560 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3561 |
4072 | 3562 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3563 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
3564 verify_dirty_young_regions(); |
2152 | 3565 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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4829
diff
changeset
|
3566 // This call will decide whether this pause is an initial-mark |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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4829
diff
changeset
|
3567 // pause. If it is, during_initial_mark_pause() will return true |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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diff
changeset
|
3568 // for the duration of this pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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4829
diff
changeset
|
3569 g1_policy()->decide_on_conc_mark_initiation(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3570 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3571 // 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
|
3572 assert(!g1_policy()->during_initial_mark_pause() || |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3573 g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3574 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3575 // 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
|
3576 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
|
3577 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3578 // 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
|
3579 // 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
|
3580 // 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
|
3581 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
|
3582 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3583 // 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
|
3584 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3585 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3586 sprintf(verbose_str, "GC pause "); |
4710 | 3587 if (g1_policy()->gcs_are_young()) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3588 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3589 } else { |
4710 | 3590 strcat(verbose_str, "(mixed)"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3591 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3592 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3593 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3594 // 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
|
3595 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3596 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3597 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
changeset
|
3598 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3599 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3600 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3601 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3602 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3603 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3604 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3605 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3606 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3607 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3608 |
2361 | 3609 // If the secondary_free_list is not empty, append it to the |
3610 // free_list. No need to wait for the cleanup operation to finish; | |
3611 // the region allocation code will check the secondary_free_list | |
3612 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3613 // set, skip this step so that the region allocation code has to | |
3614 // get entries from the secondary_free_list. | |
2152 | 3615 if (!G1StressConcRegionFreeing) { |
2361 | 3616 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3617 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3618 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3619 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3620 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3621 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3622 // 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
|
3623 // 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
|
3624 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3625 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3626 { // 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
|
3627 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3628 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3629 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3630 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
|
3631 increment_gc_time_stamp(); |
342 | 3632 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3633 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3634 HandleMark hm; // Discard invalid handles created during verification |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3635 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3636 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3637 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3638 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3639 /* option */ VerifyOption_G1UsePrevMarking); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3640 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3641 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3642 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3643 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 // 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
|
3660 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3671 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3672 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3673 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3674 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 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
|
3677 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3678 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3681 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3682 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3685 #endif // YOUNG_LIST_VERBOSE |
342 | 3686 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3692 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 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
|
3696 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3697 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 g1_policy()->choose_collection_set(target_pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3700 _cm->note_start_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3701 // 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
|
3702 // we have not filtered them yet (we'll do so during the |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3703 // GC). We also call this after choose_collection_set() to |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3704 // ensure that the CSet has been finalized. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3705 _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
|
3706 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3707 false /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3708 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3709 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3713 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3715 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3716 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3717 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3718 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3719 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3720 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3721 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3722 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3723 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3724 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3725 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3726 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3729 #endif // ASSERT |
1707 | 3730 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3732 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3739 // 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
|
3740 // (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
|
3741 // 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
|
3742 // 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
|
3743 // we checked. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3744 _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
|
3745 false /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3746 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3747 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3748 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3749 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 "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
|
3770 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3771 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3774 #endif // YOUNG_LIST_VERBOSE |
342 | 3775 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3776 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 _young_list->last_survivor_region()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3783 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3784 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3785 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3786 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3788 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3789 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 set_marking_started(); |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3793 // 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
|
3794 // 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
|
3795 // the current thread has completed its logging output. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3796 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3797 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3799 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3800 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 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
|
3804 #endif // YOUNG_LIST_VERBOSE |
342 | 3805 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3808 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3810 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3811 size_t bytes_before = capacity(); |
4785 | 3812 // No need for an ergo verbose message here, |
3813 // expansion_amount() does this when it returns a value > 0. | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3816 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3817 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3820 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3821 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3822 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3823 // We redo the verificaiton but now wrt to the new CSet which |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3824 // 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
|
3825 _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
|
3826 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3827 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3828 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3829 _cm->note_end_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3830 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3831 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 g1_policy()->record_pause_time_ms(pause_time_ms); |
4711 | 3834 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
3835 workers()->active_workers() : 1); | |
3836 g1_policy()->record_collection_pause_end(active_workers); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3837 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3838 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 // 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
|
3841 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 // 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
|
3844 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3846 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3847 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3848 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3849 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3850 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3851 // 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
|
3852 // 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
|
3853 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3854 // 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
|
3855 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3856 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3857 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3858 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3859 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3860 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3861 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3862 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3863 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3864 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3865 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3866 prepare_for_verify(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3867 Universe::verify(/* allow dirty */ true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3868 /* silent */ false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3869 /* option */ VerifyOption_G1UsePrevMarking); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3870 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3871 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3872 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3873 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3874 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3875 // 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
|
3876 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3877 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3878 // 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
|
3879 // 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
|
3880 // 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
|
3881 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3882 _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
|
3883 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3884 // We have to do this after we decide whether to expand the heap or not. |
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3885 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3886 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3887 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3888 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3889 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3890 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3891 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3892 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3893 #endif |
342 | 3894 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3895 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3896 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3897 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3898 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3899 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3900 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3901 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3902 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3903 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3904 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3905 // The closing of the inner scope, immediately above, will complete |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3906 // the PrintGC logging output. The record_collection_pause_end() call |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3907 // above will complete the logging output of PrintGCDetails. |
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 // It is not yet to safe, however, to tell the concurrent mark to |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3910 // start as we have some optional output below. We don't want the |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3911 // output from the concurrent mark thread interfering with this |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3912 // logging output either. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3913 |
3766 | 3914 _hrs.verify_optional(); |
2152 | 3915 verify_region_sets_optional(); |
3916 | |
1709 | 3917 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3918 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3919 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3920 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3921 Universe::print_heap_after_gc(); |
342 | 3922 } |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3923 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3924 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3925 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3926 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3927 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3928 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3929 } |
1973 | 3930 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3931 // 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
|
3932 // 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
|
3933 // that came from the pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3934 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3935 if (should_start_conc_mark) { |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3936 // CAUTION: after the doConcurrentMark() call below, |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3937 // the concurrent marking thread(s) could be running |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3938 // concurrently with us. Make sure that anything after |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3939 // 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
|
3940 // 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
|
3941 // 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
|
3942 // ConcurrentGCThread::safepoint_desynchronize(). |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3943 doConcurrentMark(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3944 } |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3945 |
1973 | 3946 return true; |
342 | 3947 } |
3948 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3949 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3950 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3951 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3952 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3953 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3954 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3955 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3956 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3957 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3958 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3959 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3960 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3961 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3962 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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|
3963 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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diff
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|
3964 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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1390
diff
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|
3965 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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diff
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|
3966 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
3967 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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|
3968 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
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|
3969 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
3970 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
3971 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
3972 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
3973 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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changeset
|
3974 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
3975 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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diff
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|
3976 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
3977 void G1CollectedHeap::init_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
3978 assert_at_safepoint(true /* should_be_vm_thread */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
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|
3979 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3980 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3981 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3982 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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|
3983 _retained_old_gc_alloc_region = NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3984 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3985 // We will discard the current GC alloc region if: |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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|
3986 // 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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|
3987 // b) it's already full (no point in using it), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
3988 // c) it's empty (this means that it was emptied during |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
3989 // a cleanup and it should be on the free list now), or |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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changeset
|
3990 // d) it's humongous (this means that it was emptied |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
3991 // during a cleanup and was added to the free list, but |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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changeset
|
3992 // has been subseqently used to allocate a humongous |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3993 // object that may be less than the region size). |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3994 if (retained_region != NULL && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3995 !retained_region->in_collection_set() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3996 !(retained_region->top() == retained_region->end()) && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3997 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3998 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3999 retained_region->set_saved_mark(); |
4072 | 4000 // The retained region was added to the old region set when it was |
4001 // retired. We have to remove it now, since we don't allow regions | |
4002 // we allocate to in the region sets. We'll re-add it later, when | |
4003 // it's retired again. | |
4004 _old_set.remove(retained_region); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4005 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
4006 retained_region->note_start_of_copying(during_im); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4007 _old_gc_alloc_region.set(retained_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4008 _hr_printer.reuse(retained_region); |
342 | 4009 } |
4010 } | |
4011 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4012 void G1CollectedHeap::release_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4013 _survivor_gc_alloc_region.release(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4014 // If we have an old GC alloc region to release, we'll save it in |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4015 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
4016 // _retained_old_gc_alloc_region will become NULL. This is what we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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changeset
|
4017 // want either way so no reason to check explicitly for either |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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|
4018 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
4019 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 4020 } |
4021 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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|
4022 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
4023 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
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|
4024 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
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tonyp
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|
4025 _retained_old_gc_alloc_region = NULL; |
342 | 4026 } |
4027 | |
4028 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
4029 _drain_in_progress = false; | |
4030 set_evac_failure_closure(cl); | |
4031 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4032 } | |
4033 | |
4034 void G1CollectedHeap::finalize_for_evac_failure() { | |
4035 assert(_evac_failure_scan_stack != NULL && | |
4036 _evac_failure_scan_stack->length() == 0, | |
4037 "Postcondition"); | |
4038 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 4039 delete _evac_failure_scan_stack; |
342 | 4040 _evac_failure_scan_stack = NULL; |
4041 } | |
4042 | |
4043 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4044 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4045 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4046 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4047 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4048 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4049 if (G1CollectedHeap::use_parallel_gc_threads()) { |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4050 set_par_threads(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4051 workers()->run_task(&rsfp_task); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4052 set_par_threads(0); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4053 } else { |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4054 rsfp_task.work(0); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4055 } |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4056 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4057 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4058 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4059 // Reset the claim values in the regions in the collection set. |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4060 reset_cset_heap_region_claim_values(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4061 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4062 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
342 | 4063 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
4064 | |
4065 // Now restore saved marks, if any. | |
4066 if (_objs_with_preserved_marks != NULL) { | |
4067 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4068 guarantee(_objs_with_preserved_marks->length() == | |
4069 _preserved_marks_of_objs->length(), "Both or none."); | |
4070 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4071 oop obj = _objs_with_preserved_marks->at(i); | |
4072 markOop m = _preserved_marks_of_objs->at(i); | |
4073 obj->set_mark(m); | |
4074 } | |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4075 |
342 | 4076 // Delete the preserved marks growable arrays (allocated on the C heap). |
4077 delete _objs_with_preserved_marks; | |
4078 delete _preserved_marks_of_objs; | |
4079 _objs_with_preserved_marks = NULL; | |
4080 _preserved_marks_of_objs = NULL; | |
4081 } | |
4082 } | |
4083 | |
4084 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4085 _evac_failure_scan_stack->push(obj); | |
4086 } | |
4087 | |
4088 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4089 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4090 | |
4091 while (_evac_failure_scan_stack->length() > 0) { | |
4092 oop obj = _evac_failure_scan_stack->pop(); | |
4093 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4094 obj->oop_iterate_backwards(_evac_failure_closure); | |
4095 } | |
4096 } | |
4097 | |
4098 oop | |
4099 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
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|
4100 oop old) { |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
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3317
diff
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|
4101 assert(obj_in_cs(old), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
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|
4102 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
75af3e8de182
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3317
diff
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|
4103 (HeapWord*) old)); |
342 | 4104 markOop m = old->mark(); |
4105 oop forward_ptr = old->forward_to_atomic(old); | |
4106 if (forward_ptr == NULL) { | |
4107 // Forward-to-self succeeded. | |
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4108 |
342 | 4109 if (_evac_failure_closure != cl) { |
4110 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4111 assert(!_drain_in_progress, | |
4112 "Should only be true while someone holds the lock."); | |
4113 // Set the global evac-failure closure to the current thread's. | |
4114 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4115 set_evac_failure_closure(cl); | |
4116 // Now do the common part. | |
4117 handle_evacuation_failure_common(old, m); | |
4118 // Reset to NULL. | |
4119 set_evac_failure_closure(NULL); | |
4120 } else { | |
4121 // The lock is already held, and this is recursive. | |
4122 assert(_drain_in_progress, "This should only be the recursive case."); | |
4123 handle_evacuation_failure_common(old, m); | |
4124 } | |
4125 return old; | |
4126 } else { | |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4127 // Forward-to-self failed. Either someone else managed to allocate |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4128 // space for this object (old != forward_ptr) or they beat us in |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
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|
4129 // self-forwarding it (old == forward_ptr). |
75af3e8de182
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3317
diff
changeset
|
4130 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4131 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
75af3e8de182
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3317
diff
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|
4132 "should not be in the CSet", |
75af3e8de182
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3317
diff
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|
4133 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4134 return forward_ptr; |
4135 } | |
4136 } | |
4137 | |
4138 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4139 set_evacuation_failed(true); | |
4140 | |
4141 preserve_mark_if_necessary(old, m); | |
4142 | |
4143 HeapRegion* r = heap_region_containing(old); | |
4144 if (!r->evacuation_failed()) { | |
4145 r->set_evacuation_failed(true); | |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4146 _hr_printer.evac_failure(r); |
342 | 4147 } |
4148 | |
4149 push_on_evac_failure_scan_stack(old); | |
4150 | |
4151 if (!_drain_in_progress) { | |
4152 // prevent recursion in copy_to_survivor_space() | |
4153 _drain_in_progress = true; | |
4154 drain_evac_failure_scan_stack(); | |
4155 _drain_in_progress = false; | |
4156 } | |
4157 } | |
4158 | |
4159 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4160 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4161 // We want to call the "for_promotion_failure" version only in the |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4162 // case of a promotion failure. |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4163 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4164 if (_objs_with_preserved_marks == NULL) { |
4165 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4166 _objs_with_preserved_marks = | |
4167 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4168 _preserved_marks_of_objs = | |
4169 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4170 } | |
4171 _objs_with_preserved_marks->push(obj); | |
4172 _preserved_marks_of_objs->push(m); | |
4173 } | |
4174 } | |
4175 | |
4176 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4177 size_t word_size) { | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4178 if (purpose == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4179 HeapWord* result = survivor_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4180 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4181 return result; |
342 | 4182 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4183 // Let's try to allocate in the old gen in case we can fit the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4184 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4185 return old_attempt_allocation(word_size); |
342 | 4186 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4187 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4188 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4189 HeapWord* result = old_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4190 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4191 return result; |
342 | 4192 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4193 // 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
|
4194 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4195 return survivor_attempt_allocation(word_size); |
342 | 4196 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4197 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4198 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4199 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4200 // 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
|
4201 return NULL; |
342 | 4202 } |
4203 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4204 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
|
4205 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4206 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4207 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4208 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4209 _refs(g1h->task_queue(queue_num)), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4210 _dcq(&g1h->dirty_card_queue_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4211 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4212 _g1_rem(g1h->g1_rem_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4213 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4214 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4215 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4216 _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
|
4217 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4218 _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
|
4219 _alloc_buffer_waste(0), _undo_waste(0) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4220 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4221 // 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
|
4222 // non-young regions (where the age is -1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4223 // 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
|
4224 // an attempt to eliminate cache contention |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
4225 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4226 size_t array_length = PADDING_ELEM_NUM + |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4227 real_length + |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4228 PADDING_ELEM_NUM; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4229 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4230 if (_surviving_young_words_base == NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4231 vm_exit_out_of_memory(array_length * sizeof(size_t), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4232 "Not enough space for young surv histo."); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4233 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4234 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4235 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4236 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4237 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4238 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4239 _start = os::elapsedTime(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4240 } |
342 | 4241 |
1709 | 4242 void |
4243 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4244 { | |
4245 st->print_raw_cr("GC Termination Stats"); | |
4246 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4247 " ------waste (KiB)------"); | |
4248 st->print_raw_cr("thr ms ms % ms % attempts" | |
4249 " total alloc undo"); | |
4250 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4251 " ------- ------- -------"); | |
4252 } | |
4253 | |
4254 void | |
4255 G1ParScanThreadState::print_termination_stats(int i, | |
4256 outputStream* const st) const | |
4257 { | |
4258 const double elapsed_ms = elapsed_time() * 1000.0; | |
4259 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4260 const double term_ms = term_time() * 1000.0; | |
4261 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4262 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4263 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4264 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4265 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4266 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4267 alloc_buffer_waste() * HeapWordSize / K, | |
4268 undo_waste() * HeapWordSize / K); | |
4269 } | |
4270 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4271 #ifdef ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4272 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4273 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4274 assert(UseCompressedOops, "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4275 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4276 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4277 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4278 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4279 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4280 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4281 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4282 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4283 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4284 if (has_partial_array_mask(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4285 // Must be in the collection set--it's already been copied. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4286 oop p = clear_partial_array_mask(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4287 assert(_g1h->obj_in_cs(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4288 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4289 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4290 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4291 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4292 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4293 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4294 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4295 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4296 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4297 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4298 if (ref.is_narrow()) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4299 return verify_ref((narrowOop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4300 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4301 return verify_ref((oop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4302 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4303 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4304 #endif // ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4305 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4306 void G1ParScanThreadState::trim_queue() { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4307 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4308 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4309 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4310 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4311 StarTask ref; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4312 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4313 // Drain the overflow stack first, so other threads can steal. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4314 while (refs()->pop_overflow(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4315 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4316 } |
3979
4dfb2df418f2
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4317 |
1862
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4318 while (refs()->pop_local(ref)) { |
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4319 deal_with_reference(ref); |
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|
4320 } |
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|
4321 } while (!refs()->is_empty()); |
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|
4322 } |
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|
4323 |
4787
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4324 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
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4325 G1ParScanThreadState* par_scan_state) : |
342 | 4326 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
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4327 _par_scan_state(par_scan_state), |
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4328 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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4329 _mark_in_progress(_g1->mark_in_progress()) { } |
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4330 |
4787
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4331 void G1ParCopyHelper::mark_object(oop obj) { |
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4332 #ifdef ASSERT |
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4333 HeapRegion* hr = _g1->heap_region_containing(obj); |
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4334 assert(hr != NULL, "sanity"); |
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4335 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
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|
4336 #endif // ASSERT |
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|
4337 |
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4338 // We know that the object is not moving so it's safe to read its size. |
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4339 _cm->grayRoot(obj, (size_t) obj->size()); |
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|
4340 } |
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4341 |
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4342 void G1ParCopyHelper::mark_forwarded_object(oop from_obj, oop to_obj) { |
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4343 #ifdef ASSERT |
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4344 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
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4345 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
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4346 assert(from_obj != to_obj, "should not be self-forwarded"); |
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4347 |
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4348 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
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4349 assert(from_hr != NULL, "sanity"); |
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4350 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
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4351 |
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4352 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
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4353 assert(to_hr != NULL, "sanity"); |
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4354 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
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|
4355 #endif // ASSERT |
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4356 |
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4357 // The object might be in the process of being copied by another |
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4358 // worker so we cannot trust that its to-space image is |
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4359 // well-formed. So we have to read its size from its from-space |
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4360 // image which we know should not be changing. |
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4361 _cm->grayRoot(to_obj, (size_t) from_obj->size()); |
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|
4362 } |
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|
4363 |
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|
4364 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { |
342 | 4365 size_t word_sz = old->size(); |
4366 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4367 // +1 to make the -1 indexes valid... | |
4368 int young_index = from_region->young_index_in_cset()+1; | |
4787
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4369 assert( (from_region->is_young() && young_index > 0) || |
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4370 (!from_region->is_young() && young_index == 0), "invariant" ); |
342 | 4371 G1CollectorPolicy* g1p = _g1->g1_policy(); |
4372 markOop m = old->mark(); | |
545 | 4373 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4374 : m->age(); | |
4375 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4376 word_sz); |
4377 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4378 oop obj = oop(obj_ptr); | |
4379 | |
4380 if (obj_ptr == NULL) { | |
4381 // This will either forward-to-self, or detect that someone else has | |
4382 // installed a forwarding pointer. | |
4383 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
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4384 return _g1->handle_evacuation_failure_par(cl, old); |
342 | 4385 } |
4386 | |
526 | 4387 // We're going to allocate linearly, so might as well prefetch ahead. |
4388 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4389 | |
342 | 4390 oop forward_ptr = old->forward_to_atomic(obj); |
4391 if (forward_ptr == NULL) { | |
4392 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4393 if (g1p->track_object_age(alloc_purpose)) { |
4394 // We could simply do obj->incr_age(). However, this causes a | |
4395 // performance issue. obj->incr_age() will first check whether | |
4396 // the object has a displaced mark by checking its mark word; | |
4397 // getting the mark word from the new location of the object | |
4398 // stalls. So, given that we already have the mark word and we | |
4399 // are about to install it anyway, it's better to increase the | |
4400 // age on the mark word, when the object does not have a | |
4401 // displaced mark word. We're not expecting many objects to have | |
4402 // a displaced marked word, so that case is not optimized | |
4403 // further (it could be...) and we simply call obj->incr_age(). | |
4404 | |
4405 if (m->has_displaced_mark_helper()) { | |
4406 // in this case, we have to install the mark word first, | |
4407 // otherwise obj looks to be forwarded (the old mark word, | |
4408 // which contains the forward pointer, was copied) | |
4409 obj->set_mark(m); | |
4410 obj->incr_age(); | |
4411 } else { | |
4412 m = m->incr_age(); | |
545 | 4413 obj->set_mark(m); |
526 | 4414 } |
545 | 4415 _par_scan_state->age_table()->add(obj, word_sz); |
4416 } else { | |
4417 obj->set_mark(m); | |
526 | 4418 } |
4419 | |
342 | 4420 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
4421 surv_young_words[young_index] += word_sz; | |
4422 | |
4423 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4784
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4424 // We keep track of the next start index in the length field of |
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4425 // the to-space object. The actual length can be found in the |
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|
4426 // length field of the from-space object. |
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|
4427 arrayOop(obj)->set_length(0); |
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4428 oop* old_p = set_partial_array_mask(old); |
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4429 _par_scan_state->push_on_queue(old_p); |
342 | 4430 } else { |
526 | 4431 // No point in using the slower heap_region_containing() method, |
4432 // given that we know obj is in the heap. | |
4433 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4434 obj->oop_iterate_backwards(_scanner); |
4435 } | |
4436 } else { | |
4437 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4438 obj = forward_ptr; | |
4439 } | |
4440 return obj; | |
4441 } | |
4442 | |
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|
4443 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
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4444 template <class T> |
3886
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|
4445 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
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4446 ::do_oop_work(T* p) { |
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4447 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4448 assert(barrier != G1BarrierRS || obj != NULL, |
4787
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|
4449 "Precondition: G1BarrierRS implies obj is non-NULL"); |
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|
4450 |
526 | 4451 // here the null check is implicit in the cset_fast_test() test |
1261
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|
4452 if (_g1->in_cset_fast_test(obj)) { |
4787
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|
4453 oop forwardee; |
526 | 4454 if (obj->is_forwarded()) { |
4787
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|
4455 forwardee = obj->forwardee(); |
526 | 4456 } else { |
4787
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|
4457 forwardee = copy_to_survivor_space(obj); |
342 | 4458 } |
4787
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|
4459 assert(forwardee != NULL, "forwardee should not be NULL"); |
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|
4460 oopDesc::encode_store_heap_oop(p, forwardee); |
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|
4461 if (do_mark_object && forwardee != obj) { |
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|
4462 // If the object is self-forwarded we don't need to explicitly |
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|
4463 // mark it, the evacuation failure protocol will do so. |
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|
4464 mark_forwarded_object(obj, forwardee); |
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|
4465 } |
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|
4466 |
526 | 4467 // When scanning the RS, we only care about objs in CS. |
4468 if (barrier == G1BarrierRS) { | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
4469 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4470 } |
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|
4471 } else { |
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|
4472 // The object is not in collection set. If we're a root scanning |
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|
4473 // closure during an initial mark pause (i.e. do_mark_object will |
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|
4474 // be true) then attempt to mark the object. |
4787
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|
4475 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
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|
4476 mark_object(obj); |
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|
4477 } |
526 | 4478 } |
4479 | |
4480 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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|
4481 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4482 } |
4483 | |
4484 if (do_gen_barrier && obj != NULL) { | |
4485 par_do_barrier(p); | |
4486 } | |
4487 } | |
4488 | |
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|
4489 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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|
4490 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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|
4491 |
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|
4492 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4493 assert(has_partial_array_mask(p), "invariant"); |
4784
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|
4494 oop from_obj = clear_partial_array_mask(p); |
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|
4495 |
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|
4496 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
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|
4497 assert(from_obj->is_objArray(), "must be obj array"); |
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|
4498 objArrayOop from_obj_array = objArrayOop(from_obj); |
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|
4499 // The from-space object contains the real length. |
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|
4500 int length = from_obj_array->length(); |
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|
4501 |
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|
4502 assert(from_obj->is_forwarded(), "must be forwarded"); |
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4503 oop to_obj = from_obj->forwardee(); |
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4504 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
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4505 objArrayOop to_obj_array = objArrayOop(to_obj); |
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4506 // We keep track of the next start index in the length field of the |
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|
4507 // to-space object. |
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|
4508 int next_index = to_obj_array->length(); |
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4509 assert(0 <= next_index && next_index < length, |
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4510 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
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|
4511 |
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|
4512 int start = next_index; |
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|
4513 int end = length; |
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|
4514 int remainder = end - start; |
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|
4515 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
342 | 4516 if (remainder > 2 * ParGCArrayScanChunk) { |
4517 end = start + ParGCArrayScanChunk; | |
4784
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|
4518 to_obj_array->set_length(end); |
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4519 // Push the remainder before we process the range in case another |
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4520 // worker has run out of things to do and can steal it. |
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4521 oop* from_obj_p = set_partial_array_mask(from_obj); |
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4522 _par_scan_state->push_on_queue(from_obj_p); |
342 | 4523 } else { |
4784
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4524 assert(length == end, "sanity"); |
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4525 // We'll process the final range for this object. Restore the length |
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4526 // so that the heap remains parsable in case of evacuation failure. |
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|
4527 to_obj_array->set_length(end); |
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|
4528 } |
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|
4529 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
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4530 // Process indexes [start,end). It will also process the header |
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|
4531 // along with the first chunk (i.e., the chunk with start == 0). |
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4532 // Note that at this point the length field of to_obj_array is not |
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|
4533 // correct given that we are using it to keep track of the next |
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|
4534 // start index. oop_iterate_range() (thankfully!) ignores the length |
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|
4535 // field and only relies on the start / end parameters. It does |
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|
4536 // however return the size of the object which will be incorrect. So |
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|
4537 // we have to ignore it even if we wanted to use it. |
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|
4538 to_obj_array->oop_iterate_range(&_scanner, start, end); |
342 | 4539 } |
4540 | |
4541 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4542 protected: | |
4543 G1CollectedHeap* _g1h; | |
4544 G1ParScanThreadState* _par_scan_state; | |
4545 RefToScanQueueSet* _queues; | |
4546 ParallelTaskTerminator* _terminator; | |
4547 | |
4548 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4549 RefToScanQueueSet* queues() { return _queues; } | |
4550 ParallelTaskTerminator* terminator() { return _terminator; } | |
4551 | |
4552 public: | |
4553 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4554 G1ParScanThreadState* par_scan_state, | |
4555 RefToScanQueueSet* queues, | |
4556 ParallelTaskTerminator* terminator) | |
4557 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4558 _queues(queues), _terminator(terminator) {} | |
4559 | |
1862
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|
4560 void do_void(); |
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|
4561 |
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|
4562 private: |
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|
4563 inline bool offer_termination(); |
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|
4564 }; |
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|
4565 |
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|
4566 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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|
4567 G1ParScanThreadState* const pss = par_scan_state(); |
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4568 pss->start_term_time(); |
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4569 const bool res = terminator()->offer_termination(); |
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|
4570 pss->end_term_time(); |
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|
4571 return res; |
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|
4572 } |
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|
4573 |
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|
4574 void G1ParEvacuateFollowersClosure::do_void() { |
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|
4575 StarTask stolen_task; |
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|
4576 G1ParScanThreadState* const pss = par_scan_state(); |
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|
4577 pss->trim_queue(); |
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|
4578 |
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|
4579 do { |
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|
4580 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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|
4581 assert(pss->verify_task(stolen_task), "sanity"); |
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|
4582 if (stolen_task.is_narrow()) { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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|
4583 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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|
4584 } else { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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|
4585 pss->deal_with_reference((oop*) stolen_task); |
1862
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|
4586 } |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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|
4587 |
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changeset
|
4588 // 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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changeset
|
4589 // 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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|
4590 // we drain the queues as necessary. |
342 | 4591 pss->trim_queue(); |
4592 } | |
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4593 } while (!offer_termination()); |
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|
4594 |
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|
4595 pss->retire_alloc_buffers(); |
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|
4596 } |
342 | 4597 |
4598 class G1ParTask : public AbstractGangTask { | |
4599 protected: | |
4600 G1CollectedHeap* _g1h; | |
4601 RefToScanQueueSet *_queues; | |
4602 ParallelTaskTerminator _terminator; | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
4603 uint _n_workers; |
342 | 4604 |
4605 Mutex _stats_lock; | |
4606 Mutex* stats_lock() { return &_stats_lock; } | |
4607 | |
4608 size_t getNCards() { | |
4609 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4610 / G1BlockOffsetSharedArray::N_bytes; | |
4611 } | |
4612 | |
4613 public: | |
4095
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|
4614 G1ParTask(G1CollectedHeap* g1h, |
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|
4615 RefToScanQueueSet *task_queues) |
342 | 4616 : AbstractGangTask("G1 collection"), |
4617 _g1h(g1h), | |
4618 _queues(task_queues), | |
4095
bca17e38de00
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|
4619 _terminator(0, _queues), |
bca17e38de00
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|
4620 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 4621 {} |
4622 | |
4623 RefToScanQueueSet* queues() { return _queues; } | |
4624 | |
4625 RefToScanQueue *work_queue(int i) { | |
4626 return queues()->queue(i); | |
4627 } | |
4628 | |
4095
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|
4629 ParallelTaskTerminator* terminator() { return &_terminator; } |
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|
4630 |
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|
4631 virtual void set_for_termination(int active_workers) { |
bca17e38de00
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|
4632 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
bca17e38de00
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|
4633 // in the young space (_par_seq_tasks) in the G1 heap |
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|
4634 // for SequentialSubTasksDone. |
bca17e38de00
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|
4635 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
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|
4636 // both of which need setting by set_n_termination(). |
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|
4637 _g1h->SharedHeap::set_n_termination(active_workers); |
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|
4638 _g1h->set_n_termination(active_workers); |
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|
4639 terminator()->reset_for_reuse(active_workers); |
bca17e38de00
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|
4640 _n_workers = active_workers; |
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|
4641 } |
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|
4642 |
4728
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jmasa
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4711
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|
4643 void work(uint worker_id) { |
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7121618: Change type of number of GC workers to unsigned int.
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4711
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|
4644 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 4645 |
4646 double start_time_ms = os::elapsedTime() * 1000.0; | |
4728
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jmasa
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|
4647 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 4648 |
342 | 4649 ResourceMark rm; |
4650 HandleMark hm; | |
4651 | |
3979
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6484982: G1: process references during evacuation pauses
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|
4652 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
4dfb2df418f2
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|
4653 |
4728
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changeset
|
4654 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4655 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4656 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4657 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
342 | 4658 |
4659 pss.set_evac_closure(&scan_evac_cl); | |
4660 pss.set_evac_failure_closure(&evac_failure_cl); | |
4661 pss.set_partial_scan_closure(&partial_scan_cl); | |
4662 | |
3979
4dfb2df418f2
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|
4663 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4664 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
4dfb2df418f2
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|
4665 |
4dfb2df418f2
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|
4666 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4667 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4668 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4669 OopClosure* scan_root_cl = &only_scan_root_cl; |
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4670 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
342 | 4671 |
1359
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
4672 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
3979
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|
4673 // We also need to mark copied objects. |
342 | 4674 scan_root_cl = &scan_mark_root_cl; |
4675 scan_perm_cl = &scan_mark_perm_cl; | |
4676 } | |
4677 | |
3983
811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
johnc
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3982
diff
changeset
|
4678 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
3979
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4679 |
342 | 4680 pss.start_strong_roots(); |
4681 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4682 SharedHeap::SO_AllClasses, | |
4683 scan_root_cl, | |
1261
0414c1049f15
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|
4684 &push_heap_rs_cl, |
342 | 4685 scan_perm_cl, |
4728
441e946dc1af
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4686 worker_id); |
342 | 4687 pss.end_strong_roots(); |
3823
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4688 |
342 | 4689 { |
4690 double start = os::elapsedTime(); | |
4691 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4692 evac.do_void(); | |
4693 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4694 double term_ms = pss.term_time()*1000.0; | |
4728
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4695 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
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4696 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
342 | 4697 } |
1282 | 4698 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4699 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4700 | |
4701 // Clean up any par-expanded rem sets. | |
4702 HeapRegionRemSet::par_cleanup(); | |
4703 | |
4704 if (ParallelGCVerbose) { | |
1709 | 4705 MutexLocker x(stats_lock()); |
4728
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|
4706 pss.print_termination_stats(worker_id); |
342 | 4707 } |
4708 | |
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
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4709 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4710 double end_time_ms = os::elapsedTime() * 1000.0; |
4728
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4711 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 4712 } |
4713 }; | |
4714 | |
4715 // *** Common G1 Evacuation Stuff | |
4716 | |
1833
8b10f48633dc
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4717 // This method is run in a GC worker. |
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4718 |
342 | 4719 void |
4720 G1CollectedHeap:: | |
4721 g1_process_strong_roots(bool collecting_perm_gen, | |
4722 SharedHeap::ScanningOption so, | |
4723 OopClosure* scan_non_heap_roots, | |
4724 OopsInHeapRegionClosure* scan_rs, | |
4725 OopsInGenClosure* scan_perm, | |
4726 int worker_i) { | |
3979
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4727 |
342 | 4728 // First scan the strong roots, including the perm gen. |
4729 double ext_roots_start = os::elapsedTime(); | |
4730 double closure_app_time_sec = 0.0; | |
4731 | |
4732 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4733 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4734 buf_scan_perm.set_generation(perm_gen()); | |
4735 | |
989
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|
4736 // Walk the code cache w/o buffering, because StarTask cannot handle |
148e5441d916
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|
4737 // unaligned oop locations. |
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|
4738 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
148e5441d916
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|
4739 |
148e5441d916
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|
4740 process_strong_roots(false, // no scoping; this is parallel code |
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|
4741 collecting_perm_gen, so, |
342 | 4742 &buf_scan_non_heap_roots, |
989
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diff
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|
4743 &eager_scan_code_roots, |
342 | 4744 &buf_scan_perm); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
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|
4745 |
3979
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|
4746 // Now the CM ref_processor roots. |
3823
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|
4747 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
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|
4748 // We need to treat the discovered reference lists of the |
4dfb2df418f2
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|
4749 // concurrent mark ref processor as roots and keep entries |
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|
4750 // (which are added by the marking threads) on them live |
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|
4751 // until they can be processed at the end of marking. |
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|
4752 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
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|
4753 } |
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|
4754 |
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|
4755 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4756 buf_scan_non_heap_roots.done(); |
4757 buf_scan_perm.done(); | |
3823
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|
4758 |
342 | 4759 double ext_roots_end = os::elapsedTime(); |
3823
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|
4760 |
342 | 4761 g1_policy()->reset_obj_copy_time(worker_i); |
3823
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|
4762 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
14a2fd14c0db
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|
4763 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4764 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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|
4765 |
342 | 4766 double ext_root_time_ms = |
4767 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
3823
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|
4768 |
342 | 4769 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4770 | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
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|
4771 // During conc marking we have to filter the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
4772 // to make sure we remove any oops into the CSet (which will show up |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4773 // as implicitly live). |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
4774 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4775 if (mark_in_progress()) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4776 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4777 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4778 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4779 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4780 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
342 | 4781 |
4782 // Now scan the complement of the collection set. | |
4783 if (scan_rs != NULL) { | |
4784 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4785 } | |
3823
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|
4786 |
342 | 4787 _process_strong_tasks->all_tasks_completed(); |
4788 } | |
4789 | |
4790 void | |
4791 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4792 OopClosure* non_root_closure) { | |
989
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6863023: need non-perm oops in code cache for JSR 292
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890
diff
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|
4793 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
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diff
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|
4794 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4795 } |
4796 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4797 // Weak Reference Processing support |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4798 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4799 // An always "is_alive" closure that is used to preserve referents. |
4dfb2df418f2
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diff
changeset
|
4800 // If the object is non-null then it's alive. Used in the preservation |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4801 // of referent objects that are pointed to by reference objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4802 // discovered by the CM ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
4803 class G1AlwaysAliveClosure: public BoolObjectClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
4804 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4805 public: |
4dfb2df418f2
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diff
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|
4806 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4807 void do_object(oop p) { assert(false, "Do not call."); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4808 bool do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4809 if (p != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4810 return true; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4811 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4812 return false; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4813 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4814 }; |
4dfb2df418f2
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|
4815 |
4dfb2df418f2
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|
4816 bool G1STWIsAliveClosure::do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4817 // An object is reachable if it is outside the collection set, |
4dfb2df418f2
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|
4818 // or is inside and copied. |
4dfb2df418f2
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|
4819 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
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6484982: G1: process references during evacuation pauses
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|
4820 } |
4dfb2df418f2
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|
4821 |
4dfb2df418f2
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diff
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|
4822 // Non Copying Keep Alive closure |
4dfb2df418f2
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|
4823 class G1KeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4824 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4825 public: |
4dfb2df418f2
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diff
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|
4826 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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|
4827 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
4dfb2df418f2
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diff
changeset
|
4828 void do_oop( oop* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4829 oop obj = *p; |
4dfb2df418f2
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|
4830 |
4dfb2df418f2
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|
4831 if (_g1->obj_in_cs(obj)) { |
4dfb2df418f2
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|
4832 assert( obj->is_forwarded(), "invariant" ); |
4dfb2df418f2
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changeset
|
4833 *p = obj->forwardee(); |
4dfb2df418f2
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diff
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|
4834 } |
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|
4835 } |
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|
4836 }; |
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|
4837 |
4dfb2df418f2
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|
4838 // Copying Keep Alive closure - can be called from both |
4dfb2df418f2
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changeset
|
4839 // serial and parallel code as long as different worker |
4dfb2df418f2
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|
4840 // threads utilize different G1ParScanThreadState instances |
4dfb2df418f2
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diff
changeset
|
4841 // and different queues. |
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|
4842 |
4dfb2df418f2
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|
4843 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
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|
4844 G1CollectedHeap* _g1h; |
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|
4845 OopClosure* _copy_non_heap_obj_cl; |
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|
4846 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
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|
4847 G1ParScanThreadState* _par_scan_state; |
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|
4848 |
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|
4849 public: |
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|
4850 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
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|
4851 OopClosure* non_heap_obj_cl, |
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|
4852 OopsInHeapRegionClosure* perm_obj_cl, |
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parents:
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|
4853 G1ParScanThreadState* pss): |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4854 _g1h(g1h), |
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parents:
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diff
changeset
|
4855 _copy_non_heap_obj_cl(non_heap_obj_cl), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4856 _copy_perm_obj_cl(perm_obj_cl), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4857 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4858 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4859 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4860 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
4dfb2df418f2
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parents:
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changeset
|
4861 virtual void do_oop( oop* p) { do_oop_work(p); } |
4dfb2df418f2
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|
4862 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4863 template <class T> void do_oop_work(T* p) { |
4dfb2df418f2
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parents:
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|
4864 oop obj = oopDesc::load_decode_heap_oop(p); |
4dfb2df418f2
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parents:
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diff
changeset
|
4865 |
4dfb2df418f2
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parents:
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diff
changeset
|
4866 if (_g1h->obj_in_cs(obj)) { |
4dfb2df418f2
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parents:
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diff
changeset
|
4867 // If the referent object has been forwarded (either copied |
4dfb2df418f2
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parents:
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diff
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|
4868 // to a new location or to itself in the event of an |
4dfb2df418f2
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diff
changeset
|
4869 // evacuation failure) then we need to update the reference |
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parents:
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diff
changeset
|
4870 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
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parents:
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diff
changeset
|
4871 // heap, update the RSet for the referent. |
4dfb2df418f2
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parents:
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diff
changeset
|
4872 // |
4dfb2df418f2
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parents:
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diff
changeset
|
4873 // If the referent has not been forwarded then we have to keep |
4dfb2df418f2
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parents:
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diff
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|
4874 // it alive by policy. Therefore we have copy the referent. |
4dfb2df418f2
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parents:
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|
4875 // |
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parents:
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diff
changeset
|
4876 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
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parents:
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diff
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|
4877 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
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parents:
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diff
changeset
|
4878 // phase of reference processing) the object and it's followers |
4dfb2df418f2
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parents:
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|
4879 // will be copied, the reference field set to point to the |
4dfb2df418f2
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parents:
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diff
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|
4880 // new location, and the RSet updated. Otherwise we need to |
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diff
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|
4881 // use the the non-heap or perm closures directly to copy |
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|
4882 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
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parents:
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|
4883 // updating the RSet. |
4dfb2df418f2
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parents:
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diff
changeset
|
4884 |
4dfb2df418f2
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parents:
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diff
changeset
|
4885 if (_g1h->is_in_g1_reserved(p)) { |
4dfb2df418f2
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parents:
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diff
changeset
|
4886 _par_scan_state->push_on_queue(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4887 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
4888 // The reference field is not in the G1 heap. |
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parents:
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diff
changeset
|
4889 if (_g1h->perm_gen()->is_in(p)) { |
4dfb2df418f2
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parents:
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diff
changeset
|
4890 _copy_perm_obj_cl->do_oop(p); |
4dfb2df418f2
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parents:
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diff
changeset
|
4891 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
4892 _copy_non_heap_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4893 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4894 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4895 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4896 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4897 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
4898 |
4dfb2df418f2
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parents:
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diff
changeset
|
4899 // Serial drain queue closure. Called as the 'complete_gc' |
4dfb2df418f2
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parents:
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diff
changeset
|
4900 // closure for each discovered list in some of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4901 // reference processing phases. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4902 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4903 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4904 protected: |
4dfb2df418f2
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parents:
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diff
changeset
|
4905 G1CollectedHeap* _g1h; |
4dfb2df418f2
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parents:
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diff
changeset
|
4906 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
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parents:
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diff
changeset
|
4907 |
4dfb2df418f2
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parents:
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diff
changeset
|
4908 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
4dfb2df418f2
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parents:
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diff
changeset
|
4909 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4910 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
4911 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4912 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4913 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4914 { } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4915 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4916 void do_void() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4917 G1ParScanThreadState* const pss = par_scan_state(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4918 pss->trim_queue(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4919 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4920 }; |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
4921 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4922 // Parallel Reference Processing closures |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4923 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4925 // processing during G1 evacuation pauses. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4926 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4927 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 private: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4930 RefToScanQueueSet* _queues; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4931 FlexibleWorkGang* _workers; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4932 int _active_workers; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4933 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4935 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4936 FlexibleWorkGang* workers, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4937 RefToScanQueueSet *task_queues, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4938 int n_workers) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4939 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4940 _queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4941 _workers(workers), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4942 _active_workers(n_workers) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4943 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4944 assert(n_workers > 0, "shouldn't call this otherwise"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4945 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4946 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4947 // Executes the given task using concurrent marking worker threads. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4948 virtual void execute(ProcessTask& task); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4949 virtual void execute(EnqueueTask& task); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4950 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4951 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4952 // Gang task for possibly parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4953 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4954 class G1STWRefProcTaskProxy: public AbstractGangTask { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4955 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4956 ProcessTask& _proc_task; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4957 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4958 RefToScanQueueSet *_task_queues; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4959 ParallelTaskTerminator* _terminator; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4960 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4961 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4962 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4963 G1CollectedHeap* g1h, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4964 RefToScanQueueSet *task_queues, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4965 ParallelTaskTerminator* terminator) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4966 AbstractGangTask("Process reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4967 _proc_task(proc_task), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4968 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4969 _task_queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4970 _terminator(terminator) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4971 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4972 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4973 virtual void work(uint worker_id) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4974 // The reference processing task executed by a single worker. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4975 ResourceMark rm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4976 HandleMark hm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4977 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4978 G1STWIsAliveClosure is_alive(_g1h); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4979 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4980 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4981 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4982 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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4983 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
4984 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
4985 |
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|
4986 pss.set_evac_closure(&scan_evac_cl); |
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|
4987 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
4988 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
4989 |
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|
4990 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
4991 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
4992 |
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|
4993 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
4994 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
4995 |
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|
4996 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
4997 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
4998 |
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|
4999 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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|
5000 // We also need to mark copied objects. |
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|
5001 copy_non_heap_cl = ©_mark_non_heap_cl; |
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5002 copy_perm_cl = ©_mark_perm_cl; |
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|
5003 } |
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|
5004 |
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|
5005 // Keep alive closure. |
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|
5006 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5007 |
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|
5008 // Complete GC closure |
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|
5009 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
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|
5010 |
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|
5011 // Call the reference processing task's work routine. |
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5012 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
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|
5013 |
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|
5014 // Note we cannot assert that the refs array is empty here as not all |
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|
5015 // of the processing tasks (specifically phase2 - pp2_work) execute |
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|
5016 // the complete_gc closure (which ordinarily would drain the queue) so |
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|
5017 // the queue may not be empty. |
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|
5018 } |
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|
5019 }; |
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|
5020 |
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|
5021 // Driver routine for parallel reference processing. |
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|
5022 // Creates an instance of the ref processing gang |
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|
5023 // task and has the worker threads execute it. |
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|
5024 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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|
5025 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5026 |
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|
5027 ParallelTaskTerminator terminator(_active_workers, _queues); |
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|
5028 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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|
5029 |
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|
5030 _g1h->set_par_threads(_active_workers); |
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|
5031 _workers->run_task(&proc_task_proxy); |
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|
5032 _g1h->set_par_threads(0); |
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|
5033 } |
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changeset
|
5034 |
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|
5035 // Gang task for parallel reference enqueueing. |
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changeset
|
5036 |
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|
5037 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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|
5038 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
5039 EnqueueTask& _enq_task; |
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changeset
|
5040 |
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|
5041 public: |
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diff
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|
5042 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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|
5043 AbstractGangTask("Enqueue reference objects in parallel"), |
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diff
changeset
|
5044 _enq_task(enq_task) |
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changeset
|
5045 { } |
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|
5046 |
4728
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|
5047 virtual void work(uint worker_id) { |
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changeset
|
5048 _enq_task.work(worker_id); |
3979
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|
5049 } |
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diff
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|
5050 }; |
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changeset
|
5051 |
4dfb2df418f2
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changeset
|
5052 // Driver routine for parallel reference enqueing. |
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diff
changeset
|
5053 // Creates an instance of the ref enqueueing gang |
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diff
changeset
|
5054 // task and has the worker threads execute it. |
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diff
changeset
|
5055 |
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|
5056 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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changeset
|
5057 assert(_workers != NULL, "Need parallel worker threads."); |
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diff
changeset
|
5058 |
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changeset
|
5059 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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changeset
|
5060 |
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changeset
|
5061 _g1h->set_par_threads(_active_workers); |
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|
5062 _workers->run_task(&enq_task_proxy); |
4dfb2df418f2
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|
5063 _g1h->set_par_threads(0); |
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|
5064 } |
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diff
changeset
|
5065 |
4dfb2df418f2
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diff
changeset
|
5066 // End of weak reference support closures |
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diff
changeset
|
5067 |
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changeset
|
5068 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5069 // that are in the collection set and are pointed to by reference |
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changeset
|
5070 // objects discovered by the CM ref processor. |
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diff
changeset
|
5071 |
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diff
changeset
|
5072 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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diff
changeset
|
5073 protected: |
4dfb2df418f2
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diff
changeset
|
5074 G1CollectedHeap* _g1h; |
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diff
changeset
|
5075 RefToScanQueueSet *_queues; |
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|
5076 ParallelTaskTerminator _terminator; |
4728
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diff
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|
5077 uint _n_workers; |
3979
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diff
changeset
|
5078 |
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diff
changeset
|
5079 public: |
4dfb2df418f2
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diff
changeset
|
5080 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
4dfb2df418f2
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changeset
|
5081 AbstractGangTask("ParPreserveCMReferents"), |
4dfb2df418f2
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changeset
|
5082 _g1h(g1h), |
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diff
changeset
|
5083 _queues(task_queues), |
4dfb2df418f2
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diff
changeset
|
5084 _terminator(workers, _queues), |
4dfb2df418f2
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diff
changeset
|
5085 _n_workers(workers) |
4dfb2df418f2
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diff
changeset
|
5086 { } |
4dfb2df418f2
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diff
changeset
|
5087 |
4728
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changeset
|
5088 void work(uint worker_id) { |
3979
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changeset
|
5089 ResourceMark rm; |
4dfb2df418f2
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diff
changeset
|
5090 HandleMark hm; |
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diff
changeset
|
5091 |
4728
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diff
changeset
|
5092 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5093 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5094 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5095 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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changeset
|
5096 |
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diff
changeset
|
5097 pss.set_evac_closure(&scan_evac_cl); |
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changeset
|
5098 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5099 pss.set_partial_scan_closure(&partial_scan_cl); |
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changeset
|
5100 |
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diff
changeset
|
5101 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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changeset
|
5102 |
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diff
changeset
|
5103 |
4dfb2df418f2
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diff
changeset
|
5104 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5105 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5106 |
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diff
changeset
|
5107 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5108 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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changeset
|
5109 |
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diff
changeset
|
5110 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5111 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5112 |
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|
5113 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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|
5114 // We also need to mark copied objects. |
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|
5115 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5116 copy_perm_cl = ©_mark_perm_cl; |
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|
5117 } |
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changeset
|
5118 |
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changeset
|
5119 // Is alive closure |
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changeset
|
5120 G1AlwaysAliveClosure always_alive(_g1h); |
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changeset
|
5121 |
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changeset
|
5122 // Copying keep alive closure. Applied to referent objects that need |
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changeset
|
5123 // to be copied. |
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changeset
|
5124 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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changeset
|
5125 |
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changeset
|
5126 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
5127 |
4728
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|
5128 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
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|
5129 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
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|
5130 |
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|
5131 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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|
5132 // So this must be true - but assert just in case someone decides to |
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|
5133 // change the worker ids. |
4728
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|
5134 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
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|
5135 assert(!rp->discovery_is_atomic(), "check this code"); |
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changeset
|
5136 |
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changeset
|
5137 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
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|
5138 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
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diff
changeset
|
5139 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
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|
5140 |
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|
5141 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
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|
5142 while (iter.has_next()) { |
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changeset
|
5143 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
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|
5144 // can see some null referent objects. |
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|
5145 iter.load_ptrs(DEBUG_ONLY(true)); |
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|
5146 oop ref = iter.obj(); |
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changeset
|
5147 |
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changeset
|
5148 // This will filter nulls. |
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diff
changeset
|
5149 if (iter.is_referent_alive()) { |
4dfb2df418f2
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|
5150 iter.make_referent_alive(); |
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parents:
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changeset
|
5151 } |
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|
5152 iter.move_to_next(); |
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parents:
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changeset
|
5153 } |
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parents:
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diff
changeset
|
5154 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5155 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5156 // Drain the queue - which may cause stealing |
4dfb2df418f2
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diff
changeset
|
5157 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
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|
5158 drain_queue.do_void(); |
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changeset
|
5159 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
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changeset
|
5160 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
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parents:
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|
5161 } |
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parents:
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diff
changeset
|
5162 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
5163 |
4dfb2df418f2
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parents:
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diff
changeset
|
5164 // Weak Reference processing during an evacuation pause (part 1). |
4dfb2df418f2
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parents:
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diff
changeset
|
5165 void G1CollectedHeap::process_discovered_references() { |
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changeset
|
5166 double ref_proc_start = os::elapsedTime(); |
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changeset
|
5167 |
4dfb2df418f2
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changeset
|
5168 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
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changeset
|
5169 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
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diff
changeset
|
5170 |
4dfb2df418f2
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diff
changeset
|
5171 // Any reference objects, in the collection set, that were 'discovered' |
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diff
changeset
|
5172 // 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
|
5173 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
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parents:
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diff
changeset
|
5174 // by following an RSet entry). |
4dfb2df418f2
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parents:
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diff
changeset
|
5175 // |
4dfb2df418f2
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diff
changeset
|
5176 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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diff
changeset
|
5177 // reference objects point to may not have been copied: the STW ref |
4dfb2df418f2
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parents:
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diff
changeset
|
5178 // processor would have seen that the reference object had already |
4dfb2df418f2
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diff
changeset
|
5179 // been 'discovered' and would have skipped discovering the reference, |
4dfb2df418f2
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diff
changeset
|
5180 // but would not have treated the reference object as a regular oop. |
4dfb2df418f2
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parents:
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diff
changeset
|
5181 // As a reult the copy closure would not have been applied to the |
4dfb2df418f2
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parents:
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diff
changeset
|
5182 // referent object. |
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parents:
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diff
changeset
|
5183 // |
4dfb2df418f2
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parents:
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diff
changeset
|
5184 // We need to explicitly copy these referent objects - the references |
4dfb2df418f2
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parents:
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diff
changeset
|
5185 // will be processed at the end of remarking. |
4dfb2df418f2
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parents:
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diff
changeset
|
5186 // |
4dfb2df418f2
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parents:
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diff
changeset
|
5187 // We also need to do this copying before we process the reference |
4dfb2df418f2
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diff
changeset
|
5188 // objects discovered by the STW ref processor in case one of these |
4dfb2df418f2
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diff
changeset
|
5189 // referents points to another object which is also referenced by an |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5190 // object discovered by the STW ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5191 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5192 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5193 workers()->active_workers() : 1); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5194 |
4711 | 5195 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
5196 active_workers == workers()->active_workers(), | |
5197 "Need to reset active_workers"); | |
5198 | |
4095
bca17e38de00
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jmasa
parents:
4090
diff
changeset
|
5199 set_par_threads(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
5200 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5201 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5202 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
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diff
changeset
|
5203 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5204 } else { |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5205 keep_cm_referents.work(0); |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5206 } |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5207 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5208 set_par_threads(0); |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5209 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
changeset
|
5210 // Closure to test whether a referent is alive. |
4dfb2df418f2
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diff
changeset
|
5211 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5212 |
4dfb2df418f2
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diff
changeset
|
5213 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
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diff
changeset
|
5214 // of JNI refs is serial and performed serially by the current thread |
4dfb2df418f2
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diff
changeset
|
5215 // 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
|
5216 // JNI refs. |
4dfb2df418f2
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parents:
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diff
changeset
|
5217 |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5218 // Use only a single queue for this PSS. |
4dfb2df418f2
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diff
changeset
|
5219 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
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diff
changeset
|
5220 |
4dfb2df418f2
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diff
changeset
|
5221 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
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parents:
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diff
changeset
|
5222 // closures while we're actually processing the discovered |
4dfb2df418f2
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parents:
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diff
changeset
|
5223 // reference objects. |
4dfb2df418f2
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diff
changeset
|
5224 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
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changeset
|
5225 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5226 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5227 |
4dfb2df418f2
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diff
changeset
|
5228 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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diff
changeset
|
5229 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
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diff
changeset
|
5230 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
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diff
changeset
|
5231 |
4dfb2df418f2
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diff
changeset
|
5232 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
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diff
changeset
|
5233 |
4dfb2df418f2
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diff
changeset
|
5234 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5235 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5236 |
4dfb2df418f2
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diff
changeset
|
5237 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5238 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5239 |
4dfb2df418f2
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diff
changeset
|
5240 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
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|
5241 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
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changeset
|
5242 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5244 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5247 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 // Keep alive closure. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5252 // Serial Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5254 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5256 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 rp->process_discovered_references(&is_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 &keep_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 &drain_queue, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5263 NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5265 // Parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5272 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 // Weak Reference processing during an evacuation pause (part 2). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 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
|
5289 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5296 // Parallel reference enqueuing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5297 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5298 uint active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5299 assert(active_workers == workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5300 "Need to reset active_workers"); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5301 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5304 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5305 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5308 rp->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5310 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5312 // 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
|
5313 // Should we do that here also? We could, but it is a serial operation |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5314 // and could signicantly increase the pause time. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5315 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5316 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5317 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5318 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 |
342 | 5320 void G1CollectedHeap::evacuate_collection_set() { |
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5321 _expand_heap_after_alloc_failure = true; |
342 | 5322 set_evacuation_failed(false); |
5323 | |
5324 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5325 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5326 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5327 | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5328 uint n_workers; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5329 if (G1CollectedHeap::use_parallel_gc_threads()) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5330 n_workers = |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5331 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5332 workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5333 Threads::number_of_non_daemon_threads()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5334 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5335 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5336 "If not dynamic should be using all the workers"); |
4711 | 5337 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5338 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5339 } else { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5340 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5341 "Should be the original non-parallel value"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5342 n_workers = 1; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5343 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5344 |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5345 G1ParTask g1_par_task(this, _task_queues); |
342 | 5346 |
5347 init_for_evac_failure(NULL); | |
5348 | |
5349 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5350 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5351 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 5352 double start_par = os::elapsedTime(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5353 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5354 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 5355 // The individual threads will set their evac-failure closures. |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5356 StrongRootsScope srs(this); |
1709 | 5357 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5358 // These tasks use ShareHeap::_process_strong_tasks |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5359 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5360 workers()->active_workers() == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5361 "If not dynamic should be using all the workers"); |
342 | 5362 workers()->run_task(&g1_par_task); |
5363 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5364 StrongRootsScope srs(this); |
4711 | 5365 g1_par_task.set_for_termination(n_workers); |
342 | 5366 g1_par_task.work(0); |
5367 } | |
5368 | |
5369 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
5370 g1_policy()->record_par_time(par_time); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5371 |
342 | 5372 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5373 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5374 // Process any discovered reference objects - we have |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 // to do this _before_ we retire the GC alloc regions |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5377 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5378 // not copied during the pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5379 process_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5380 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5381 // Weak root processing. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5382 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5383 // non-perm oops then we will need to process the code blobs |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5384 // here too. |
342 | 5385 { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5386 G1STWIsAliveClosure is_alive(this); |
342 | 5387 G1KeepAliveClosure keep_alive(this); |
5388 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5389 } | |
3979
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5390 |
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5391 release_gc_alloc_regions(); |
342 | 5392 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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5393 |
889 | 5394 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5395 concurrent_g1_refine()->set_use_cache(true); |
5396 | |
5397 finalize_for_evac_failure(); | |
5398 | |
5399 if (evacuation_failed()) { | |
5400 remove_self_forwarding_pointers(); | |
5401 if (PrintGCDetails) { | |
1719
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5402 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5403 } else if (PrintGC) { |
5404 gclog_or_tty->print("--"); | |
5405 } | |
5406 } | |
5407 | |
3979
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5408 // Enqueue any remaining references remaining on the STW |
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|
5409 // reference processor's discovered lists. We need to do |
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5410 // this after the card table is cleaned (and verified) as |
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5411 // the act of enqueuing entries on to the pending list |
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5412 // will log these updates (and dirty their associated |
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|
5413 // cards). We need these updates logged to update any |
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|
5414 // RSets. |
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5415 enqueue_discovered_references(); |
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|
5416 |
616
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5417 if (G1DeferredRSUpdate) { |
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5418 RedirtyLoggedCardTableEntryFastClosure redirty; |
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5419 dirty_card_queue_set().set_closure(&redirty); |
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5420 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5421 |
5422 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5423 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
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5424 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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5425 } |
342 | 5426 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5427 } | |
5428 | |
2173 | 5429 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5430 size_t* pre_used, |
5431 FreeRegionList* free_list, | |
4072 | 5432 OldRegionSet* old_proxy_set, |
2152 | 5433 HumongousRegionSet* humongous_proxy_set, |
2173 | 5434 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5435 bool par) { |
5436 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5437 if (hr->isHumongous()) { | |
5438 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5439 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5440 } else { | |
4072 | 5441 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5442 free_region(hr, pre_used, free_list, par); |
342 | 5443 } |
2173 | 5444 } else { |
5445 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5446 } |
5447 } | |
5448 | |
2152 | 5449 void G1CollectedHeap::free_region(HeapRegion* hr, |
5450 size_t* pre_used, | |
5451 FreeRegionList* free_list, | |
5452 bool par) { | |
5453 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5454 assert(!hr->is_empty(), "the region should not be empty"); | |
5455 assert(free_list != NULL, "pre-condition"); | |
5456 | |
5457 *pre_used += hr->used(); | |
5458 hr->hr_clear(par, true /* clear_space */); | |
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5459 free_list->add_as_head(hr); |
2152 | 5460 } |
5461 | |
5462 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5463 size_t* pre_used, | |
5464 FreeRegionList* free_list, | |
5465 HumongousRegionSet* humongous_proxy_set, | |
5466 bool par) { | |
5467 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5468 assert(free_list != NULL, "pre-condition"); | |
5469 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5470 | |
5471 size_t hr_used = hr->used(); | |
5472 size_t hr_capacity = hr->capacity(); | |
5473 size_t hr_pre_used = 0; | |
5474 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5475 hr->set_notHumongous(); | |
5476 free_region(hr, &hr_pre_used, free_list, par); | |
5477 | |
3766 | 5478 size_t i = hr->hrs_index() + 1; |
2152 | 5479 size_t num = 1; |
3766 | 5480 while (i < n_regions()) { |
5481 HeapRegion* curr_hr = region_at(i); | |
2152 | 5482 if (!curr_hr->continuesHumongous()) { |
5483 break; | |
5484 } | |
5485 curr_hr->set_notHumongous(); | |
5486 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5487 num += 1; | |
5488 i += 1; | |
5489 } | |
5490 assert(hr_pre_used == hr_used, | |
5491 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5492 "should be the same", hr_pre_used, hr_used)); | |
5493 *pre_used += hr_pre_used; | |
5494 } | |
5495 | |
5496 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5497 FreeRegionList* free_list, | |
4072 | 5498 OldRegionSet* old_proxy_set, |
2152 | 5499 HumongousRegionSet* humongous_proxy_set, |
5500 bool par) { | |
5501 if (pre_used > 0) { | |
5502 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5503 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5504 assert(_summary_bytes_used >= pre_used, |
5505 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5506 "should be >= pre_used: "SIZE_FORMAT, | |
5507 _summary_bytes_used, pre_used)); | |
342 | 5508 _summary_bytes_used -= pre_used; |
2152 | 5509 } |
5510 if (free_list != NULL && !free_list->is_empty()) { | |
5511 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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5512 _free_list.add_as_head(free_list); |
2152 | 5513 } |
4072 | 5514 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5515 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5516 _old_set.update_from_proxy(old_proxy_set); | |
5517 } | |
2152 | 5518 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5519 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5520 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5521 } |
5522 } | |
5523 | |
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5524 class G1ParCleanupCTTask : public AbstractGangTask { |
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5525 CardTableModRefBS* _ct_bs; |
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5526 G1CollectedHeap* _g1h; |
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5527 HeapRegion* volatile _su_head; |
796
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|
5528 public: |
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|
5529 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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5530 G1CollectedHeap* g1h) : |
796
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5531 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
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5532 _ct_bs(ct_bs), _g1h(g1h) { } |
796
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|
5533 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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diff
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|
5534 void work(uint worker_id) { |
796
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|
5535 HeapRegion* r; |
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|
5536 while (r = _g1h->pop_dirty_cards_region()) { |
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|
5537 clear_cards(r); |
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|
5538 } |
940
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|
5539 } |
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|
5540 |
796
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|
5541 void clear_cards(HeapRegion* r) { |
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|
5542 // Cards of the survivors should have already been dirtied. |
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|
5543 if (!r->is_survivor()) { |
796
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|
5544 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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|
5545 } |
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|
5546 } |
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|
5547 }; |
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|
5548 |
940
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|
5549 #ifndef PRODUCT |
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|
5550 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
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|
5551 G1CollectedHeap* _g1h; |
940
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|
5552 CardTableModRefBS* _ct_bs; |
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|
5553 public: |
3317
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|
5554 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
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5555 : _g1h(g1h), _ct_bs(ct_bs) { } |
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5556 virtual bool doHeapRegion(HeapRegion* r) { |
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5557 if (r->is_survivor()) { |
3317
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|
5558 _g1h->verify_dirty_region(r); |
940
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|
5559 } else { |
3317
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|
5560 _g1h->verify_not_dirty_region(r); |
940
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|
5561 } |
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diff
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|
5562 return false; |
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|
5563 } |
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|
5564 }; |
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|
5565 |
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|
5566 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
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5567 // All of the region should be clean. |
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|
5568 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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5569 MemRegion mr(hr->bottom(), hr->end()); |
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|
5570 ct_bs->verify_not_dirty_region(mr); |
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5571 } |
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|
5572 |
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|
5573 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
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5574 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
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5575 // dirty allocated blocks as they allocate them. The thread that |
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5576 // retires each region and replaces it with a new one will do a |
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5577 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
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5578 // not dirty that area (one less thing to have to do while holding |
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|
5579 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
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5580 // is dirty. |
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|
5581 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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|
5582 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
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|
5583 ct_bs->verify_dirty_region(mr); |
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5584 } |
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5585 |
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|
5586 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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5587 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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|
5588 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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|
5589 verify_dirty_region(hr); |
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|
5590 } |
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|
5591 } |
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|
5592 |
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|
5593 void G1CollectedHeap::verify_dirty_young_regions() { |
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5594 verify_dirty_young_list(_young_list->first_region()); |
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5595 verify_dirty_young_list(_young_list->first_survivor_region()); |
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|
5596 } |
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|
5597 #endif |
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|
5598 |
342 | 5599 void G1CollectedHeap::cleanUpCardTable() { |
5600 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5601 double start = os::elapsedTime(); | |
5602 | |
4023 | 5603 { |
5604 // Iterate over the dirty cards region list. | |
5605 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
5606 | |
4711 | 5607 if (G1CollectedHeap::use_parallel_gc_threads()) { |
5608 set_par_threads(); | |
4023 | 5609 workers()->run_task(&cleanup_task); |
5610 set_par_threads(0); | |
5611 } else { | |
5612 while (_dirty_cards_region_list) { | |
5613 HeapRegion* r = _dirty_cards_region_list; | |
5614 cleanup_task.clear_cards(r); | |
5615 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
5616 if (_dirty_cards_region_list == r) { | |
5617 // The last region. | |
5618 _dirty_cards_region_list = NULL; | |
5619 } | |
5620 r->set_next_dirty_cards_region(NULL); | |
796
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|
5621 } |
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|
5622 } |
4023 | 5623 #ifndef PRODUCT |
5624 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
5625 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
5626 heap_region_iterate(&cleanup_verifier); | |
5627 } | |
5628 #endif | |
940
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|
5629 } |
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5630 |
342 | 5631 double elapsed = os::elapsedTime() - start; |
3979
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|
5632 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
342 | 5633 } |
5634 | |
5635 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5636 size_t pre_used = 0; |
5637 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5638 | |
342 | 5639 double young_time_ms = 0.0; |
5640 double non_young_time_ms = 0.0; | |
5641 | |
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5642 // Since the collection set is a superset of the the young list, |
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5643 // all we need to do to clear the young list is clear its |
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5644 // head and length, and unlink any young regions in the code below |
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5645 _young_list->clear(); |
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5646 |
342 | 5647 G1CollectorPolicy* policy = g1_policy(); |
5648 | |
5649 double start_sec = os::elapsedTime(); | |
5650 bool non_young = true; | |
5651 | |
5652 HeapRegion* cur = cs_head; | |
5653 int age_bound = -1; | |
5654 size_t rs_lengths = 0; | |
5655 | |
5656 while (cur != NULL) { | |
2361 | 5657 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 5658 if (non_young) { |
5659 if (cur->is_young()) { | |
5660 double end_sec = os::elapsedTime(); | |
5661 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5662 non_young_time_ms += elapsed_ms; | |
5663 | |
5664 start_sec = os::elapsedTime(); | |
5665 non_young = false; | |
5666 } | |
5667 } else { | |
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5668 if (!cur->is_young()) { |
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5669 double end_sec = os::elapsedTime(); |
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5670 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
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5671 young_time_ms += elapsed_ms; |
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|
5672 |
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5673 start_sec = os::elapsedTime(); |
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5674 non_young = true; |
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|
5675 } |
342 | 5676 } |
5677 | |
5678 rs_lengths += cur->rem_set()->occupied(); | |
5679 | |
5680 HeapRegion* next = cur->next_in_collection_set(); | |
5681 assert(cur->in_collection_set(), "bad CS"); | |
5682 cur->set_next_in_collection_set(NULL); | |
5683 cur->set_in_collection_set(false); | |
5684 | |
5685 if (cur->is_young()) { | |
5686 int index = cur->young_index_in_cset(); | |
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|
5687 assert(index != -1, "invariant"); |
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5688 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
342 | 5689 size_t words_survived = _surviving_young_words[index]; |
5690 cur->record_surv_words_in_group(words_survived); | |
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5691 |
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|
5692 // At this point the we have 'popped' cur from the collection set |
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5693 // (linked via next_in_collection_set()) but it is still in the |
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|
5694 // young list (linked via next_young_region()). Clear the |
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|
5695 // _next_young_region field. |
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|
5696 cur->set_next_young_region(NULL); |
342 | 5697 } else { |
5698 int index = cur->young_index_in_cset(); | |
4090
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|
5699 assert(index == -1, "invariant"); |
342 | 5700 } |
5701 | |
5702 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5703 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5704 "invariant" ); | |
5705 | |
5706 if (!cur->evacuation_failed()) { | |
4097
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|
5707 MemRegion used_mr = cur->used_region(); |
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|
5708 |
342 | 5709 // And the region is empty. |
4097
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|
5710 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
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|
5711 |
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|
5712 // If marking is in progress then clear any objects marked in |
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|
5713 // the current region. Note mark_in_progress() returns false, |
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|
5714 // even during an initial mark pause, until the set_marking_started() |
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|
5715 // call which takes place later in the pause. |
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|
5716 if (mark_in_progress()) { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5717 assert(!g1_policy()->during_initial_mark_pause(), "sanity"); |
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|
5718 _cm->nextMarkBitMap()->clearRange(used_mr); |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5719 } |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5720 |
2152 | 5721 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 5722 } else { |
5723 cur->uninstall_surv_rate_group(); | |
4090
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|
5724 if (cur->is_young()) { |
342 | 5725 cur->set_young_index_in_cset(-1); |
4090
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|
5726 } |
342 | 5727 cur->set_not_young(); |
5728 cur->set_evacuation_failed(false); | |
4072 | 5729 // The region is now considered to be old. |
5730 _old_set.add(cur); | |
342 | 5731 } |
5732 cur = next; | |
5733 } | |
5734 | |
5735 policy->record_max_rs_lengths(rs_lengths); | |
5736 policy->cset_regions_freed(); | |
5737 | |
5738 double end_sec = os::elapsedTime(); | |
5739 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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|
5740 |
dc467e8b2c5e
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diff
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|
5741 if (non_young) { |
342 | 5742 non_young_time_ms += elapsed_ms; |
4097
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|
5743 } else { |
342 | 5744 young_time_ms += elapsed_ms; |
4097
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|
5745 } |
342 | 5746 |
2152 | 5747 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 5748 NULL /* old_proxy_set */, |
2152 | 5749 NULL /* humongous_proxy_set */, |
5750 false /* par */); | |
342 | 5751 policy->record_young_free_cset_time_ms(young_time_ms); |
5752 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5753 } | |
5754 | |
1394
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5755 // This routine is similar to the above but does not record |
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|
5756 // any policy statistics or update free lists; we are abandoning |
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|
5757 // the current incremental collection set in preparation of a |
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|
5758 // full collection. After the full GC we will start to build up |
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|
5759 // the incremental collection set again. |
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|
5760 // This is only called when we're doing a full collection |
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|
5761 // and is immediately followed by the tearing down of the young list. |
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|
5762 |
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|
5763 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
1316cec51b4d
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|
5764 HeapRegion* cur = cs_head; |
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|
5765 |
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|
5766 while (cur != NULL) { |
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|
5767 HeapRegion* next = cur->next_in_collection_set(); |
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|
5768 assert(cur->in_collection_set(), "bad CS"); |
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|
5769 cur->set_next_in_collection_set(NULL); |
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|
5770 cur->set_in_collection_set(false); |
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|
5771 cur->set_young_index_in_cset(-1); |
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|
5772 cur = next; |
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|
5773 } |
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|
5774 } |
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|
5775 |
2152 | 5776 void G1CollectedHeap::set_free_regions_coming() { |
5777 if (G1ConcRegionFreeingVerbose) { | |
5778 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5779 "setting free regions coming"); | |
5780 } | |
5781 | |
5782 assert(!free_regions_coming(), "pre-condition"); | |
5783 _free_regions_coming = true; | |
342 | 5784 } |
5785 | |
2152 | 5786 void G1CollectedHeap::reset_free_regions_coming() { |
5787 { | |
5788 assert(free_regions_coming(), "pre-condition"); | |
5789 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5790 _free_regions_coming = false; | |
5791 SecondaryFreeList_lock->notify_all(); | |
5792 } | |
5793 | |
5794 if (G1ConcRegionFreeingVerbose) { | |
5795 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5796 "reset free regions coming"); | |
342 | 5797 } |
5798 } | |
5799 | |
2152 | 5800 void G1CollectedHeap::wait_while_free_regions_coming() { |
5801 // Most of the time we won't have to wait, so let's do a quick test | |
5802 // first before we take the lock. | |
5803 if (!free_regions_coming()) { | |
5804 return; | |
5805 } | |
5806 | |
5807 if (G1ConcRegionFreeingVerbose) { | |
5808 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5809 "waiting for free regions"); | |
342 | 5810 } |
5811 | |
5812 { | |
2152 | 5813 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5814 while (free_regions_coming()) { | |
5815 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5816 } |
2152 | 5817 } |
5818 | |
5819 if (G1ConcRegionFreeingVerbose) { | |
5820 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5821 "done waiting for free regions"); | |
5822 } | |
342 | 5823 } |
5824 | |
5825 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5826 assert(heap_lock_held_for_gc(), | |
5827 "the heap lock should already be held by or for this thread"); | |
5828 _young_list->push_region(hr); | |
5829 } | |
5830 | |
5831 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5832 private: | |
5833 bool _success; | |
5834 public: | |
5835 NoYoungRegionsClosure() : _success(true) { } | |
5836 bool doHeapRegion(HeapRegion* r) { | |
5837 if (r->is_young()) { | |
5838 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5839 r->bottom(), r->end()); | |
5840 _success = false; | |
5841 } | |
5842 return false; | |
5843 } | |
5844 bool success() { return _success; } | |
5845 }; | |
5846 | |
1394
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5847 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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|
5848 bool ret = _young_list->check_list_empty(check_sample); |
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|
5849 |
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|
5850 if (check_heap) { |
342 | 5851 NoYoungRegionsClosure closure; |
5852 heap_region_iterate(&closure); | |
5853 ret = ret && closure.success(); | |
5854 } | |
5855 | |
5856 return ret; | |
5857 } | |
5858 | |
4072 | 5859 class TearDownRegionSetsClosure : public HeapRegionClosure { |
5860 private: | |
5861 OldRegionSet *_old_set; | |
2152 | 5862 |
342 | 5863 public: |
4072 | 5864 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 5865 |
342 | 5866 bool doHeapRegion(HeapRegion* r) { |
4072 | 5867 if (r->is_empty()) { |
5868 // We ignore empty regions, we'll empty the free list afterwards | |
5869 } else if (r->is_young()) { | |
5870 // We ignore young regions, we'll empty the young list afterwards | |
5871 } else if (r->isHumongous()) { | |
5872 // We ignore humongous regions, we're not tearing down the | |
5873 // humongous region set | |
342 | 5874 } else { |
4072 | 5875 // The rest should be old |
5876 _old_set->remove(r); | |
342 | 5877 } |
5878 return false; | |
5879 } | |
5880 | |
4072 | 5881 ~TearDownRegionSetsClosure() { |
5882 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 5883 } |
342 | 5884 }; |
5885 | |
4072 | 5886 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
5887 assert_at_safepoint(true /* should_be_vm_thread */); | |
5888 | |
5889 if (!free_list_only) { | |
5890 TearDownRegionSetsClosure cl(&_old_set); | |
5891 heap_region_iterate(&cl); | |
5892 | |
5893 // Need to do this after the heap iteration to be able to | |
5894 // recognize the young regions and ignore them during the iteration. | |
5895 _young_list->empty_list(); | |
5896 } | |
5897 _free_list.remove_all(); | |
5898 } | |
5899 | |
5900 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
5901 private: | |
5902 bool _free_list_only; | |
5903 OldRegionSet* _old_set; | |
5904 FreeRegionList* _free_list; | |
5905 size_t _total_used; | |
5906 | |
5907 public: | |
5908 RebuildRegionSetsClosure(bool free_list_only, | |
5909 OldRegionSet* old_set, FreeRegionList* free_list) : | |
5910 _free_list_only(free_list_only), | |
5911 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
5912 assert(_free_list->is_empty(), "pre-condition"); | |
5913 if (!free_list_only) { | |
5914 assert(_old_set->is_empty(), "pre-condition"); | |
5915 } | |
5916 } | |
5917 | |
5918 bool doHeapRegion(HeapRegion* r) { | |
5919 if (r->continuesHumongous()) { | |
5920 return false; | |
5921 } | |
5922 | |
5923 if (r->is_empty()) { | |
5924 // Add free regions to the free list | |
5925 _free_list->add_as_tail(r); | |
5926 } else if (!_free_list_only) { | |
5927 assert(!r->is_young(), "we should not come across young regions"); | |
5928 | |
5929 if (r->isHumongous()) { | |
5930 // We ignore humongous regions, we left the humongous set unchanged | |
5931 } else { | |
5932 // The rest should be old, add them to the old set | |
5933 _old_set->add(r); | |
5934 } | |
5935 _total_used += r->used(); | |
5936 } | |
5937 | |
5938 return false; | |
5939 } | |
5940 | |
5941 size_t total_used() { | |
5942 return _total_used; | |
5943 } | |
5944 }; | |
5945 | |
5946 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
5947 assert_at_safepoint(true /* should_be_vm_thread */); | |
5948 | |
5949 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
5950 heap_region_iterate(&cl); | |
5951 | |
5952 if (!free_list_only) { | |
5953 _summary_bytes_used = cl.total_used(); | |
5954 } | |
5955 assert(_summary_bytes_used == recalculate_used(), | |
5956 err_msg("inconsistent _summary_bytes_used, " | |
5957 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
5958 _summary_bytes_used, recalculate_used())); | |
342 | 5959 } |
5960 | |
5961 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5962 _refine_cte_cl->set_concurrent(concurrent); | |
5963 } | |
5964 | |
5965 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5966 HeapRegion* hr = heap_region_containing(p); | |
5967 if (hr == NULL) { | |
5968 return is_in_permanent(p); | |
5969 } else { | |
5970 return hr->is_in(p); | |
5971 } | |
5972 } | |
2152 | 5973 |
3830
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5974 // Methods for the mutator alloc region |
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|
5975 |
2433
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|
5976 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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|
5977 bool force) { |
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|
5978 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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|
5979 assert(!force || g1_policy()->can_expand_young_list(), |
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|
5980 "if force is true we should be able to expand the young list"); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
5981 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
5982 if (force || !young_list_full) { |
2433
abdfc822206f
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|
5983 HeapRegion* new_alloc_region = new_region(word_size, |
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|
5984 false /* do_expand */); |
abdfc822206f
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|
5985 if (new_alloc_region != NULL) { |
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|
5986 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
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diff
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|
5987 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5988 return new_alloc_region; |
abdfc822206f
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|
5989 } |
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diff
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|
5990 } |
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diff
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|
5991 return NULL; |
abdfc822206f
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diff
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|
5992 } |
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diff
changeset
|
5993 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
5994 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
abdfc822206f
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|
5995 size_t allocated_bytes) { |
abdfc822206f
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diff
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|
5996 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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|
5997 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
abdfc822206f
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diff
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|
5998 |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
5999 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
abdfc822206f
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|
6000 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
3777
diff
changeset
|
6001 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6002 // 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
|
6003 // 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
|
6004 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6005 g1mm()->update_eden_size(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
6006 } |
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|
6007 |
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|
6008 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
abdfc822206f
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diff
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|
6009 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
6010 return _g1h->new_mutator_alloc_region(word_size, force); |
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|
6011 } |
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|
6012 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
4090
diff
changeset
|
6013 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
4090
diff
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|
6014 // 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
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|
6015 // in the workgroup. |
4711 | 6016 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
|
6017 uint n_workers = workers()->active_workers(); |
4711 | 6018 assert(UseDynamicNumberOfGCThreads || |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
4090
diff
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|
6019 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
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|
6020 "Otherwise should be using the total number of workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
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|
6021 if (n_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6022 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
|
6023 n_workers = ParallelGCThreads; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6024 workers()->set_active_workers(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6025 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6026 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6027 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
6028 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
6029 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6030 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6031 _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
|
6032 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6033 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
6034 // Methods for the GC alloc regions |
f44782f04dd4
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|
6035 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6036 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
6037 size_t count, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6038 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6039 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
f44782f04dd4
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|
6040 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6041 if (count < g1_policy()->max_regions(ap)) { |
f44782f04dd4
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parents:
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diff
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|
6042 HeapRegion* new_alloc_region = new_region(word_size, |
f44782f04dd4
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diff
changeset
|
6043 true /* do_expand */); |
f44782f04dd4
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diff
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|
6044 if (new_alloc_region != NULL) { |
f44782f04dd4
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diff
changeset
|
6045 // We really only need to do this for old regions given that we |
f44782f04dd4
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diff
changeset
|
6046 // 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
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3824
diff
changeset
|
6047 // for survivors too. |
f44782f04dd4
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changeset
|
6048 new_alloc_region->set_saved_mark(); |
f44782f04dd4
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|
6049 if (ap == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6050 new_alloc_region->set_survivor(); |
f44782f04dd4
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|
6051 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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|
6052 } else { |
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|
6053 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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|
6054 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
6055 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
6056 new_alloc_region->note_start_of_copying(during_im); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6057 return new_alloc_region; |
f44782f04dd4
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diff
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|
6058 } else { |
f44782f04dd4
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diff
changeset
|
6059 g1_policy()->note_alloc_region_limit_reached(ap); |
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changeset
|
6060 } |
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changeset
|
6061 } |
f44782f04dd4
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diff
changeset
|
6062 return NULL; |
f44782f04dd4
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changeset
|
6063 } |
f44782f04dd4
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changeset
|
6064 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
6065 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
f44782f04dd4
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|
6066 size_t allocated_bytes, |
f44782f04dd4
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diff
changeset
|
6067 GCAllocPurpose ap) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
6068 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
6069 alloc_region->note_end_of_copying(during_im); |
3830
f44782f04dd4
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changeset
|
6070 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6071 if (ap == GCAllocForSurvived) { |
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6072 young_list()->add_survivor_region(alloc_region); |
4072 | 6073 } else { |
6074 _old_set.add(alloc_region); | |
3830
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6075 } |
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6076 _hr_printer.retire(alloc_region); |
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6077 } |
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6078 |
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6079 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6080 bool force) { |
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6081 assert(!force, "not supported for GC alloc regions"); |
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6082 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6083 } |
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6084 |
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6085 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6086 size_t allocated_bytes) { |
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6087 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6088 GCAllocForSurvived); |
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6089 } |
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6090 |
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6091 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6092 bool force) { |
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6093 assert(!force, "not supported for GC alloc regions"); |
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6094 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6095 } |
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6096 |
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6097 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6098 size_t allocated_bytes) { |
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6099 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6100 GCAllocForTenured); |
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6101 } |
2433
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6102 // Heap region set verification |
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6103 |
2152 | 6104 class VerifyRegionListsClosure : public HeapRegionClosure { |
6105 private: | |
4072 | 6106 FreeRegionList* _free_list; |
6107 OldRegionSet* _old_set; | |
2152 | 6108 HumongousRegionSet* _humongous_set; |
6109 size_t _region_count; | |
6110 | |
6111 public: | |
4072 | 6112 VerifyRegionListsClosure(OldRegionSet* old_set, |
6113 HumongousRegionSet* humongous_set, | |
2152 | 6114 FreeRegionList* free_list) : |
4072 | 6115 _old_set(old_set), _humongous_set(humongous_set), |
6116 _free_list(free_list), _region_count(0) { } | |
2152 | 6117 |
6118 size_t region_count() { return _region_count; } | |
6119 | |
6120 bool doHeapRegion(HeapRegion* hr) { | |
6121 _region_count += 1; | |
6122 | |
6123 if (hr->continuesHumongous()) { | |
6124 return false; | |
6125 } | |
6126 | |
6127 if (hr->is_young()) { | |
6128 // TODO | |
6129 } else if (hr->startsHumongous()) { | |
6130 _humongous_set->verify_next_region(hr); | |
6131 } else if (hr->is_empty()) { | |
6132 _free_list->verify_next_region(hr); | |
4072 | 6133 } else { |
6134 _old_set->verify_next_region(hr); | |
2152 | 6135 } |
6136 return false; | |
6137 } | |
6138 }; | |
6139 | |
3766 | 6140 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
6141 HeapWord* bottom) { | |
6142 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6143 MemRegion mr(bottom, end); | |
6144 assert(_g1_reserved.contains(mr), "invariant"); | |
6145 // This might return NULL if the allocation fails | |
6146 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
6147 } | |
6148 | |
2152 | 6149 void G1CollectedHeap::verify_region_sets() { |
6150 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6151 | |
6152 // First, check the explicit lists. | |
6153 _free_list.verify(); | |
6154 { | |
6155 // Given that a concurrent operation might be adding regions to | |
6156 // the secondary free list we have to take the lock before | |
6157 // verifying it. | |
6158 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6159 _secondary_free_list.verify(); | |
6160 } | |
4072 | 6161 _old_set.verify(); |
2152 | 6162 _humongous_set.verify(); |
6163 | |
6164 // If a concurrent region freeing operation is in progress it will | |
6165 // be difficult to correctly attributed any free regions we come | |
6166 // across to the correct free list given that they might belong to | |
6167 // one of several (free_list, secondary_free_list, any local lists, | |
6168 // etc.). So, if that's the case we will skip the rest of the | |
6169 // verification operation. Alternatively, waiting for the concurrent | |
6170 // operation to complete will have a non-trivial effect on the GC's | |
6171 // operation (no concurrent operation will last longer than the | |
6172 // interval between two calls to verification) and it might hide | |
6173 // any issues that we would like to catch during testing. | |
6174 if (free_regions_coming()) { | |
6175 return; | |
6176 } | |
6177 | |
2361 | 6178 // Make sure we append the secondary_free_list on the free_list so |
6179 // that all free regions we will come across can be safely | |
6180 // attributed to the free_list. | |
6181 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6182 |
6183 // Finally, make sure that the region accounting in the lists is | |
6184 // consistent with what we see in the heap. | |
4072 | 6185 _old_set.verify_start(); |
2152 | 6186 _humongous_set.verify_start(); |
6187 _free_list.verify_start(); | |
6188 | |
4072 | 6189 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6190 heap_region_iterate(&cl); |
6191 | |
4072 | 6192 _old_set.verify_end(); |
2152 | 6193 _humongous_set.verify_end(); |
6194 _free_list.verify_end(); | |
342 | 6195 } |