Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4090:a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
Summary: Major cleanup of the G1CollectorPolicy class. It removes a lot of unused fields and methods and also consolidates replicated information (mainly various ways of counting the number of CSet regions) into one copy.
Reviewed-by: johnc, brutisso
author | tonyp |
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date | Fri, 18 Nov 2011 12:52:27 -0500 |
parents | 53074c2c4600 |
children | bca17e38de00 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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" |
1972 | 35 #include "gc_implementation/g1/g1MarkSweep.hpp" |
36 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
37 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
38 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
39 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
40 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
41 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
42 #include "memory/gcLocker.inline.hpp" | |
43 #include "memory/genOopClosures.inline.hpp" | |
44 #include "memory/generationSpec.hpp" | |
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45 #include "memory/referenceProcessor.hpp" |
1972 | 46 #include "oops/oop.inline.hpp" |
47 #include "oops/oop.pcgc.inline.hpp" | |
48 #include "runtime/aprofiler.hpp" | |
49 #include "runtime/vmThread.hpp" | |
342 | 50 |
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51 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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52 |
342 | 53 // turn it on so that the contents of the young list (scan-only / |
54 // to-be-collected) are printed at "strategic" points before / during | |
55 // / after the collection --- this is useful for debugging | |
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56 #define YOUNG_LIST_VERBOSE 0 |
342 | 57 // CURRENT STATUS |
58 // This file is under construction. Search for "FIXME". | |
59 | |
60 // INVARIANTS/NOTES | |
61 // | |
62 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 63 // serialized by acquiring the HeapLock. This happens in mem_allocate |
64 // and allocate_new_tlab, which are the "entry" points to the | |
65 // allocation code from the rest of the JVM. (Note that this does not | |
66 // apply to TLAB allocation, which is not part of this interface: it | |
67 // is done by clients of this interface.) | |
342 | 68 |
69 // Local to this file. | |
70 | |
71 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
72 SuspendibleThreadSet* _sts; | |
73 G1RemSet* _g1rs; | |
74 ConcurrentG1Refine* _cg1r; | |
75 bool _concurrent; | |
76 public: | |
77 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
78 G1RemSet* g1rs, | |
79 ConcurrentG1Refine* cg1r) : | |
80 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
81 {} | |
82 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 83 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
84 // This path is executed by the concurrent refine or mutator threads, | |
85 // concurrently, and so we do not care if card_ptr contains references | |
86 // that point into the collection set. | |
87 assert(!oops_into_cset, "should be"); | |
88 | |
342 | 89 if (_concurrent && _sts->should_yield()) { |
90 // Caller will actually yield. | |
91 return false; | |
92 } | |
93 // Otherwise, we finished successfully; return true. | |
94 return true; | |
95 } | |
96 void set_concurrent(bool b) { _concurrent = b; } | |
97 }; | |
98 | |
99 | |
100 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
101 int _calls; | |
102 G1CollectedHeap* _g1h; | |
103 CardTableModRefBS* _ctbs; | |
104 int _histo[256]; | |
105 public: | |
106 ClearLoggedCardTableEntryClosure() : | |
107 _calls(0) | |
108 { | |
109 _g1h = G1CollectedHeap::heap(); | |
110 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
111 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
112 } | |
113 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
114 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
115 _calls++; | |
116 unsigned char* ujb = (unsigned char*)card_ptr; | |
117 int ind = (int)(*ujb); | |
118 _histo[ind]++; | |
119 *card_ptr = -1; | |
120 } | |
121 return true; | |
122 } | |
123 int calls() { return _calls; } | |
124 void print_histo() { | |
125 gclog_or_tty->print_cr("Card table value histogram:"); | |
126 for (int i = 0; i < 256; i++) { | |
127 if (_histo[i] != 0) { | |
128 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
129 } | |
130 } | |
131 } | |
132 }; | |
133 | |
134 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
135 int _calls; | |
136 G1CollectedHeap* _g1h; | |
137 CardTableModRefBS* _ctbs; | |
138 public: | |
139 RedirtyLoggedCardTableEntryClosure() : | |
140 _calls(0) | |
141 { | |
142 _g1h = G1CollectedHeap::heap(); | |
143 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
144 } | |
145 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
146 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
147 _calls++; | |
148 *card_ptr = 0; | |
149 } | |
150 return true; | |
151 } | |
152 int calls() { return _calls; } | |
153 }; | |
154 | |
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155 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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156 public: |
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157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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158 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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159 return true; |
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160 } |
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161 }; |
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162 |
342 | 163 YoungList::YoungList(G1CollectedHeap* g1h) |
164 : _g1h(g1h), _head(NULL), | |
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165 _length(0), |
342 | 166 _last_sampled_rs_lengths(0), |
545 | 167 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 168 { |
169 guarantee( check_list_empty(false), "just making sure..." ); | |
170 } | |
171 | |
172 void YoungList::push_region(HeapRegion *hr) { | |
173 assert(!hr->is_young(), "should not already be young"); | |
174 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
175 | |
176 hr->set_next_young_region(_head); | |
177 _head = hr; | |
178 | |
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179 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 180 ++_length; |
181 } | |
182 | |
183 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 184 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 185 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
186 | |
187 hr->set_next_young_region(_survivor_head); | |
188 if (_survivor_head == NULL) { | |
545 | 189 _survivor_tail = hr; |
342 | 190 } |
191 _survivor_head = hr; | |
192 ++_survivor_length; | |
193 } | |
194 | |
195 void YoungList::empty_list(HeapRegion* list) { | |
196 while (list != NULL) { | |
197 HeapRegion* next = list->get_next_young_region(); | |
198 list->set_next_young_region(NULL); | |
199 list->uninstall_surv_rate_group(); | |
200 list->set_not_young(); | |
201 list = next; | |
202 } | |
203 } | |
204 | |
205 void YoungList::empty_list() { | |
206 assert(check_list_well_formed(), "young list should be well formed"); | |
207 | |
208 empty_list(_head); | |
209 _head = NULL; | |
210 _length = 0; | |
211 | |
212 empty_list(_survivor_head); | |
213 _survivor_head = NULL; | |
545 | 214 _survivor_tail = NULL; |
342 | 215 _survivor_length = 0; |
216 | |
217 _last_sampled_rs_lengths = 0; | |
218 | |
219 assert(check_list_empty(false), "just making sure..."); | |
220 } | |
221 | |
222 bool YoungList::check_list_well_formed() { | |
223 bool ret = true; | |
224 | |
225 size_t length = 0; | |
226 HeapRegion* curr = _head; | |
227 HeapRegion* last = NULL; | |
228 while (curr != NULL) { | |
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229 if (!curr->is_young()) { |
342 | 230 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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231 "incorrectly tagged (y: %d, surv: %d)", |
342 | 232 curr->bottom(), curr->end(), |
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233 curr->is_young(), curr->is_survivor()); |
342 | 234 ret = false; |
235 } | |
236 ++length; | |
237 last = curr; | |
238 curr = curr->get_next_young_region(); | |
239 } | |
240 ret = ret && (length == _length); | |
241 | |
242 if (!ret) { | |
243 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
244 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
245 length, _length); | |
246 } | |
247 | |
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248 return ret; |
342 | 249 } |
250 | |
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251 bool YoungList::check_list_empty(bool check_sample) { |
342 | 252 bool ret = true; |
253 | |
254 if (_length != 0) { | |
255 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
256 _length); | |
257 ret = false; | |
258 } | |
259 if (check_sample && _last_sampled_rs_lengths != 0) { | |
260 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
261 ret = false; | |
262 } | |
263 if (_head != NULL) { | |
264 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
265 ret = false; | |
266 } | |
267 if (!ret) { | |
268 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
269 } | |
270 | |
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271 return ret; |
342 | 272 } |
273 | |
274 void | |
275 YoungList::rs_length_sampling_init() { | |
276 _sampled_rs_lengths = 0; | |
277 _curr = _head; | |
278 } | |
279 | |
280 bool | |
281 YoungList::rs_length_sampling_more() { | |
282 return _curr != NULL; | |
283 } | |
284 | |
285 void | |
286 YoungList::rs_length_sampling_next() { | |
287 assert( _curr != NULL, "invariant" ); | |
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288 size_t rs_length = _curr->rem_set()->occupied(); |
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289 |
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290 _sampled_rs_lengths += rs_length; |
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291 |
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292 // The current region may not yet have been added to the |
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293 // incremental collection set (it gets added when it is |
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294 // retired as the current allocation region). |
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295 if (_curr->in_collection_set()) { |
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296 // Update the collection set policy information for this region |
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297 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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298 } |
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299 |
342 | 300 _curr = _curr->get_next_young_region(); |
301 if (_curr == NULL) { | |
302 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
303 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
304 } | |
305 } | |
306 | |
307 void | |
308 YoungList::reset_auxilary_lists() { | |
309 guarantee( is_empty(), "young list should be empty" ); | |
310 assert(check_list_well_formed(), "young list should be well formed"); | |
311 | |
312 // Add survivor regions to SurvRateGroup. | |
313 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 314 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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315 |
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316 int young_index_in_cset = 0; |
342 | 317 for (HeapRegion* curr = _survivor_head; |
318 curr != NULL; | |
319 curr = curr->get_next_young_region()) { | |
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320 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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321 |
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322 // The region is a non-empty survivor so let's add it to |
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323 // the incremental collection set for the next evacuation |
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324 // pause. |
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325 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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326 young_index_in_cset += 1; |
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327 } |
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328 assert((size_t) young_index_in_cset == _survivor_length, |
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329 "post-condition"); |
342 | 330 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
331 | |
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332 _head = _survivor_head; |
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333 _length = _survivor_length; |
342 | 334 if (_survivor_head != NULL) { |
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335 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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336 assert(_survivor_length > 0, "invariant"); |
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337 _survivor_tail->set_next_young_region(NULL); |
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338 } |
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339 |
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340 // Don't clear the survivor list handles until the start of |
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341 // the next evacuation pause - we need it in order to re-tag |
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342 // the survivor regions from this evacuation pause as 'young' |
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343 // at the start of the next. |
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344 |
545 | 345 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 346 |
347 assert(check_list_well_formed(), "young list should be well formed"); | |
348 } | |
349 | |
350 void YoungList::print() { | |
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351 HeapRegion* lists[] = {_head, _survivor_head}; |
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352 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 353 |
354 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
355 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
356 HeapRegion *curr = lists[list]; | |
357 if (curr == NULL) | |
358 gclog_or_tty->print_cr(" empty"); | |
359 while (curr != NULL) { | |
360 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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361 "age: %4d, y: %d, surv: %d", |
342 | 362 curr->bottom(), curr->end(), |
363 curr->top(), | |
364 curr->prev_top_at_mark_start(), | |
365 curr->next_top_at_mark_start(), | |
366 curr->top_at_conc_mark_count(), | |
367 curr->age_in_surv_rate_group_cond(), | |
368 curr->is_young(), | |
369 curr->is_survivor()); | |
370 curr = curr->get_next_young_region(); | |
371 } | |
372 } | |
373 | |
374 gclog_or_tty->print_cr(""); | |
375 } | |
376 | |
796
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377 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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378 { |
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379 // Claim the right to put the region on the dirty cards region list |
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380 // by installing a self pointer. |
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381 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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382 if (next == NULL) { |
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383 HeapRegion* res = (HeapRegion*) |
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384 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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385 NULL); |
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386 if (res == NULL) { |
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387 HeapRegion* head; |
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388 do { |
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389 // Put the region to the dirty cards region list. |
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390 head = _dirty_cards_region_list; |
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391 next = (HeapRegion*) |
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392 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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393 if (next == head) { |
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394 assert(hr->get_next_dirty_cards_region() == hr, |
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395 "hr->get_next_dirty_cards_region() != hr"); |
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396 if (next == NULL) { |
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397 // The last region in the list points to itself. |
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398 hr->set_next_dirty_cards_region(hr); |
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399 } else { |
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400 hr->set_next_dirty_cards_region(next); |
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401 } |
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402 } |
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403 } while (next != head); |
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404 } |
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405 } |
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406 } |
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407 |
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408 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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409 { |
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410 HeapRegion* head; |
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411 HeapRegion* hr; |
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412 do { |
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413 head = _dirty_cards_region_list; |
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414 if (head == NULL) { |
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415 return NULL; |
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416 } |
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417 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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418 if (head == new_head) { |
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419 // The last region. |
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420 new_head = NULL; |
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421 } |
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422 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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423 head); |
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424 } while (hr != head); |
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425 assert(hr != NULL, "invariant"); |
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426 hr->set_next_dirty_cards_region(NULL); |
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427 return hr; |
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428 } |
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429 |
342 | 430 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 431 _cg1r->stop(); |
342 | 432 _cmThread->stop(); |
433 } | |
434 | |
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435 #ifdef ASSERT |
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436 // A region is added to the collection set as it is retired |
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437 // so an address p can point to a region which will be in the |
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438 // collection set but has not yet been retired. This method |
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439 // therefore is only accurate during a GC pause after all |
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440 // regions have been retired. It is used for debugging |
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441 // to check if an nmethod has references to objects that can |
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442 // be move during a partial collection. Though it can be |
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443 // inaccurate, it is sufficient for G1 because the conservative |
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444 // implementation of is_scavengable() for G1 will indicate that |
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445 // all nmethods must be scanned during a partial collection. |
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446 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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447 HeapRegion* hr = heap_region_containing(p); |
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448 return hr != NULL && hr->in_collection_set(); |
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449 } |
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450 #endif |
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451 |
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452 // Returns true if the reference points to an object that |
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453 // can move in an incremental collecction. |
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454 bool G1CollectedHeap::is_scavengable(const void* p) { |
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455 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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456 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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457 HeapRegion* hr = heap_region_containing(p); |
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458 if (hr == NULL) { |
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459 // perm gen (or null) |
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460 return false; |
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461 } else { |
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462 return !hr->isHumongous(); |
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463 } |
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464 } |
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465 |
342 | 466 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
467 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
468 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
469 | |
470 // Count the dirty cards at the start. | |
471 CountNonCleanMemRegionClosure count1(this); | |
472 ct_bs->mod_card_iterate(&count1); | |
473 int orig_count = count1.n(); | |
474 | |
475 // First clear the logged cards. | |
476 ClearLoggedCardTableEntryClosure clear; | |
477 dcqs.set_closure(&clear); | |
478 dcqs.apply_closure_to_all_completed_buffers(); | |
479 dcqs.iterate_closure_all_threads(false); | |
480 clear.print_histo(); | |
481 | |
482 // Now ensure that there's no dirty cards. | |
483 CountNonCleanMemRegionClosure count2(this); | |
484 ct_bs->mod_card_iterate(&count2); | |
485 if (count2.n() != 0) { | |
486 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
487 count2.n(), orig_count); | |
488 } | |
489 guarantee(count2.n() == 0, "Card table should be clean."); | |
490 | |
491 RedirtyLoggedCardTableEntryClosure redirty; | |
492 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
493 dcqs.apply_closure_to_all_completed_buffers(); | |
494 dcqs.iterate_closure_all_threads(false); | |
495 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
496 clear.calls(), orig_count); | |
497 guarantee(redirty.calls() == clear.calls(), | |
498 "Or else mechanism is broken."); | |
499 | |
500 CountNonCleanMemRegionClosure count3(this); | |
501 ct_bs->mod_card_iterate(&count3); | |
502 if (count3.n() != orig_count) { | |
503 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
504 orig_count, count3.n()); | |
505 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
506 } | |
507 | |
508 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
509 } | |
510 | |
511 // Private class members. | |
512 | |
513 G1CollectedHeap* G1CollectedHeap::_g1h; | |
514 | |
515 // Private methods. | |
516 | |
2152 | 517 HeapRegion* |
2361 | 518 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 519 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
520 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
521 if (!_secondary_free_list.is_empty()) { | |
522 if (G1ConcRegionFreeingVerbose) { | |
523 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
524 "secondary_free_list has "SIZE_FORMAT" entries", | |
525 _secondary_free_list.length()); | |
526 } | |
527 // It looks as if there are free regions available on the | |
528 // secondary_free_list. Let's move them to the free_list and try | |
529 // again to allocate from it. | |
530 append_secondary_free_list(); | |
531 | |
532 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
533 "empty we should have moved at least one entry to the free_list"); | |
534 HeapRegion* res = _free_list.remove_head(); | |
535 if (G1ConcRegionFreeingVerbose) { | |
536 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
537 "allocated "HR_FORMAT" from secondary_free_list", | |
538 HR_FORMAT_PARAMS(res)); | |
539 } | |
540 return res; | |
541 } | |
542 | |
543 // Wait here until we get notifed either when (a) there are no | |
544 // more free regions coming or (b) some regions have been moved on | |
545 // the secondary_free_list. | |
546 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
547 } | |
548 | |
549 if (G1ConcRegionFreeingVerbose) { | |
550 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
551 "could not allocate from secondary_free_list"); | |
552 } | |
553 return NULL; | |
554 } | |
555 | |
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556 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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557 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 558 "the only time we use this to allocate a humongous region is " |
559 "when we are allocating a single humongous region"); | |
560 | |
561 HeapRegion* res; | |
562 if (G1StressConcRegionFreeing) { | |
563 if (!_secondary_free_list.is_empty()) { | |
564 if (G1ConcRegionFreeingVerbose) { | |
565 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
566 "forced to look at the secondary_free_list"); | |
567 } | |
2361 | 568 res = new_region_try_secondary_free_list(); |
2152 | 569 if (res != NULL) { |
570 return res; | |
571 } | |
572 } | |
573 } | |
574 res = _free_list.remove_head_or_null(); | |
575 if (res == NULL) { | |
576 if (G1ConcRegionFreeingVerbose) { | |
577 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
578 "res == NULL, trying the secondary_free_list"); | |
579 } | |
2361 | 580 res = new_region_try_secondary_free_list(); |
2152 | 581 } |
342 | 582 if (res == NULL && do_expand) { |
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583 ergo_verbose1(ErgoHeapSizing, |
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584 "attempt heap expansion", |
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585 ergo_format_reason("region allocation request failed") |
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586 ergo_format_byte("allocation request"), |
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587 word_size * HeapWordSize); |
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588 if (expand(word_size * HeapWordSize)) { |
3766 | 589 // Even though the heap was expanded, it might not have reached |
590 // the desired size. So, we cannot assume that the allocation | |
591 // will succeed. | |
592 res = _free_list.remove_head_or_null(); | |
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593 } |
342 | 594 } |
595 return res; | |
596 } | |
597 | |
3766 | 598 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
599 size_t word_size) { | |
2361 | 600 assert(isHumongous(word_size), "word_size should be humongous"); |
601 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
602 | |
3766 | 603 size_t first = G1_NULL_HRS_INDEX; |
2152 | 604 if (num_regions == 1) { |
605 // Only one region to allocate, no need to go through the slower | |
606 // path. The caller will attempt the expasion if this fails, so | |
607 // let's not try to expand here too. | |
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608 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 609 if (hr != NULL) { |
610 first = hr->hrs_index(); | |
611 } else { | |
3766 | 612 first = G1_NULL_HRS_INDEX; |
2152 | 613 } |
614 } else { | |
615 // We can't allocate humongous regions while cleanupComplete() is | |
616 // running, since some of the regions we find to be empty might not | |
617 // yet be added to the free list and it is not straightforward to | |
618 // know which list they are on so that we can remove them. Note | |
619 // that we only need to do this if we need to allocate more than | |
620 // one region to satisfy the current humongous allocation | |
621 // request. If we are only allocating one region we use the common | |
622 // region allocation code (see above). | |
623 wait_while_free_regions_coming(); | |
2361 | 624 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 625 |
626 if (free_regions() >= num_regions) { | |
3766 | 627 first = _hrs.find_contiguous(num_regions); |
628 if (first != G1_NULL_HRS_INDEX) { | |
629 for (size_t i = first; i < first + num_regions; ++i) { | |
630 HeapRegion* hr = region_at(i); | |
2152 | 631 assert(hr->is_empty(), "sanity"); |
2361 | 632 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 633 hr->set_pending_removal(true); |
634 } | |
635 _free_list.remove_all_pending(num_regions); | |
636 } | |
637 } | |
638 } | |
639 return first; | |
640 } | |
641 | |
2361 | 642 HeapWord* |
3766 | 643 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 644 size_t num_regions, |
645 size_t word_size) { | |
3766 | 646 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 647 assert(isHumongous(word_size), "word_size should be humongous"); |
648 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
649 | |
650 // Index of last region in the series + 1. | |
3766 | 651 size_t last = first + num_regions; |
2361 | 652 |
653 // We need to initialize the region(s) we just discovered. This is | |
654 // a bit tricky given that it can happen concurrently with | |
655 // refinement threads refining cards on these regions and | |
656 // potentially wanting to refine the BOT as they are scanning | |
657 // those cards (this can happen shortly after a cleanup; see CR | |
658 // 6991377). So we have to set up the region(s) carefully and in | |
659 // a specific order. | |
660 | |
661 // The word size sum of all the regions we will allocate. | |
662 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
663 assert(word_size <= word_size_sum, "sanity"); | |
664 | |
665 // This will be the "starts humongous" region. | |
3766 | 666 HeapRegion* first_hr = region_at(first); |
2361 | 667 // The header of the new object will be placed at the bottom of |
668 // the first region. | |
669 HeapWord* new_obj = first_hr->bottom(); | |
670 // This will be the new end of the first region in the series that | |
671 // should also match the end of the last region in the seriers. | |
672 HeapWord* new_end = new_obj + word_size_sum; | |
673 // This will be the new top of the first region that will reflect | |
674 // this allocation. | |
675 HeapWord* new_top = new_obj + word_size; | |
676 | |
677 // First, we need to zero the header of the space that we will be | |
678 // allocating. When we update top further down, some refinement | |
679 // threads might try to scan the region. By zeroing the header we | |
680 // ensure that any thread that will try to scan the region will | |
681 // come across the zero klass word and bail out. | |
682 // | |
683 // NOTE: It would not have been correct to have used | |
684 // CollectedHeap::fill_with_object() and make the space look like | |
685 // an int array. The thread that is doing the allocation will | |
686 // later update the object header to a potentially different array | |
687 // type and, for a very short period of time, the klass and length | |
688 // fields will be inconsistent. This could cause a refinement | |
689 // thread to calculate the object size incorrectly. | |
690 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
691 | |
692 // We will set up the first region as "starts humongous". This | |
693 // will also update the BOT covering all the regions to reflect | |
694 // that there is a single object that starts at the bottom of the | |
695 // first region. | |
696 first_hr->set_startsHumongous(new_top, new_end); | |
697 | |
698 // Then, if there are any, we will set up the "continues | |
699 // humongous" regions. | |
700 HeapRegion* hr = NULL; | |
3766 | 701 for (size_t i = first + 1; i < last; ++i) { |
702 hr = region_at(i); | |
2361 | 703 hr->set_continuesHumongous(first_hr); |
704 } | |
705 // If we have "continues humongous" regions (hr != NULL), then the | |
706 // end of the last one should match new_end. | |
707 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
708 | |
709 // Up to this point no concurrent thread would have been able to | |
710 // do any scanning on any region in this series. All the top | |
711 // fields still point to bottom, so the intersection between | |
712 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
713 // update the top fields, we'll do a storestore to make sure that | |
714 // no thread sees the update to top before the zeroing of the | |
715 // object header and the BOT initialization. | |
716 OrderAccess::storestore(); | |
717 | |
718 // Now that the BOT and the object header have been initialized, | |
719 // we can update top of the "starts humongous" region. | |
720 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
721 "new_top should be in this region"); | |
722 first_hr->set_top(new_top); | |
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723 if (_hr_printer.is_active()) { |
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724 HeapWord* bottom = first_hr->bottom(); |
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725 HeapWord* end = first_hr->orig_end(); |
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726 if ((first + 1) == last) { |
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727 // the series has a single humongous region |
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728 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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729 } else { |
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730 // the series has more than one humongous regions |
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731 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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732 } |
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733 } |
2361 | 734 |
735 // Now, we will update the top fields of the "continues humongous" | |
736 // regions. The reason we need to do this is that, otherwise, | |
737 // these regions would look empty and this will confuse parts of | |
738 // G1. For example, the code that looks for a consecutive number | |
739 // of empty regions will consider them empty and try to | |
740 // re-allocate them. We can extend is_empty() to also include | |
741 // !continuesHumongous(), but it is easier to just update the top | |
742 // fields here. The way we set top for all regions (i.e., top == | |
743 // end for all regions but the last one, top == new_top for the | |
744 // last one) is actually used when we will free up the humongous | |
745 // region in free_humongous_region(). | |
746 hr = NULL; | |
3766 | 747 for (size_t i = first + 1; i < last; ++i) { |
748 hr = region_at(i); | |
2361 | 749 if ((i + 1) == last) { |
750 // last continues humongous region | |
751 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
752 "new_top should fall on this region"); | |
753 hr->set_top(new_top); | |
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754 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 755 } else { |
756 // not last one | |
757 assert(new_top > hr->end(), "new_top should be above this region"); | |
758 hr->set_top(hr->end()); | |
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759 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 760 } |
761 } | |
762 // If we have continues humongous regions (hr != NULL), then the | |
763 // end of the last one should match new_end and its top should | |
764 // match new_top. | |
765 assert(hr == NULL || | |
766 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
767 | |
768 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
769 _summary_bytes_used += first_hr->used(); | |
770 _humongous_set.add(first_hr); | |
771 | |
772 return new_obj; | |
773 } | |
774 | |
342 | 775 // If could fit into free regions w/o expansion, try. |
776 // Otherwise, if can expand, do so. | |
777 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 778 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 779 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
780 | |
781 verify_region_sets_optional(); | |
342 | 782 |
783 size_t num_regions = | |
1973 | 784 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 785 size_t x_size = expansion_regions(); |
3766 | 786 size_t fs = _hrs.free_suffix(); |
787 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
788 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 789 // The only thing we can do now is attempt expansion. |
342 | 790 if (fs + x_size >= num_regions) { |
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791 // If the number of regions we're trying to allocate for this |
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792 // object is at most the number of regions in the free suffix, |
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793 // then the call to humongous_obj_allocate_find_first() above |
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794 // should have succeeded and we wouldn't be here. |
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795 // |
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796 // We should only be trying to expand when the free suffix is |
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797 // not sufficient for the object _and_ we have some expansion |
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798 // room available. |
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799 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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800 |
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801 ergo_verbose1(ErgoHeapSizing, |
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802 "attempt heap expansion", |
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803 ergo_format_reason("humongous allocation request failed") |
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804 ergo_format_byte("allocation request"), |
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805 word_size * HeapWordSize); |
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806 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 807 // Even though the heap was expanded, it might not have |
808 // reached the desired size. So, we cannot assume that the | |
809 // allocation will succeed. | |
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810 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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811 } |
2152 | 812 } |
813 } | |
814 | |
2361 | 815 HeapWord* result = NULL; |
3766 | 816 if (first != G1_NULL_HRS_INDEX) { |
2361 | 817 result = |
818 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
819 assert(result != NULL, "it should always return a valid result"); | |
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820 |
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821 // A successful humongous object allocation changes the used space |
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822 // information of the old generation so we need to recalculate the |
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823 // sizes and update the jstat counters here. |
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824 g1mm()->update_sizes(); |
2152 | 825 } |
826 | |
827 verify_region_sets_optional(); | |
2361 | 828 |
829 return result; | |
342 | 830 } |
831 | |
1973 | 832 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
833 assert_heap_not_locked_and_not_at_safepoint(); | |
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834 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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835 |
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836 unsigned int dummy_gc_count_before; |
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837 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 838 } |
839 | |
840 HeapWord* | |
841 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 842 bool* gc_overhead_limit_was_exceeded) { |
843 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 844 |
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845 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 846 for (int try_count = 1; /* we'll return */; try_count += 1) { |
847 unsigned int gc_count_before; | |
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848 |
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849 HeapWord* result = NULL; |
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850 if (!isHumongous(word_size)) { |
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851 result = attempt_allocation(word_size, &gc_count_before); |
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852 } else { |
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853 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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854 } |
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855 if (result != NULL) { |
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856 return result; |
342 | 857 } |
858 | |
859 // Create the garbage collection operation... | |
1973 | 860 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 861 // ...and get the VM thread to execute it. |
862 VMThread::execute(&op); | |
1973 | 863 |
864 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
865 // If the operation was successful we'll return the result even | |
866 // if it is NULL. If the allocation attempt failed immediately | |
867 // after a Full GC, it's unlikely we'll be able to allocate now. | |
868 HeapWord* result = op.result(); | |
869 if (result != NULL && !isHumongous(word_size)) { | |
870 // Allocations that take place on VM operations do not do any | |
871 // card dirtying and we have to do it here. We only have to do | |
872 // this for non-humongous allocations, though. | |
873 dirty_young_block(result, word_size); | |
874 } | |
342 | 875 return result; |
1973 | 876 } else { |
877 assert(op.result() == NULL, | |
878 "the result should be NULL if the VM op did not succeed"); | |
342 | 879 } |
880 | |
881 // Give a warning if we seem to be looping forever. | |
882 if ((QueuedAllocationWarningCount > 0) && | |
883 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 884 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 885 } |
886 } | |
1973 | 887 |
888 ShouldNotReachHere(); | |
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889 return NULL; |
342 | 890 } |
891 | |
2433
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892 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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893 unsigned int *gc_count_before_ret) { |
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894 // Make sure you read the note in attempt_allocation_humongous(). |
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|
895 |
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896 assert_heap_not_locked_and_not_at_safepoint(); |
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897 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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898 "be called for humongous allocation requests"); |
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|
899 |
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900 // We should only get here after the first-level allocation attempt |
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901 // (attempt_allocation()) failed to allocate. |
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902 |
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903 // We will loop until a) we manage to successfully perform the |
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904 // allocation or b) we successfully schedule a collection which |
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905 // fails to perform the allocation. b) is the only case when we'll |
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906 // return NULL. |
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907 HeapWord* result = NULL; |
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908 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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909 bool should_try_gc; |
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|
910 unsigned int gc_count_before; |
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911 |
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912 { |
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913 MutexLockerEx x(Heap_lock); |
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914 |
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915 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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916 false /* bot_updates */); |
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917 if (result != NULL) { |
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918 return result; |
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919 } |
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920 |
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921 // If we reach here, attempt_allocation_locked() above failed to |
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922 // allocate a new region. So the mutator alloc region should be NULL. |
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923 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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924 |
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925 if (GC_locker::is_active_and_needs_gc()) { |
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926 if (g1_policy()->can_expand_young_list()) { |
3914
20213c8a3c40
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927 // No need for an ergo verbose message here, |
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928 // can_expand_young_list() does this when it returns true. |
2433
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929 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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930 false /* bot_updates */); |
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931 if (result != NULL) { |
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|
932 return result; |
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|
933 } |
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|
934 } |
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|
935 should_try_gc = false; |
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|
936 } else { |
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937 // Read the GC count while still holding the Heap_lock. |
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938 gc_count_before = SharedHeap::heap()->total_collections(); |
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|
939 should_try_gc = true; |
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|
940 } |
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|
941 } |
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|
942 |
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|
943 if (should_try_gc) { |
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|
944 bool succeeded; |
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|
945 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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946 if (result != NULL) { |
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947 assert(succeeded, "only way to get back a non-NULL result"); |
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948 return result; |
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|
949 } |
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|
950 |
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|
951 if (succeeded) { |
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|
952 // If we get here we successfully scheduled a collection which |
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|
953 // failed to allocate. No point in trying to allocate |
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|
954 // further. We'll just return NULL. |
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|
955 MutexLockerEx x(Heap_lock); |
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956 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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|
957 return NULL; |
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|
958 } |
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|
959 } else { |
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|
960 GC_locker::stall_until_clear(); |
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|
961 } |
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|
962 |
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|
963 // We can reach here if we were unsuccessul in scheduling a |
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|
964 // collection (because another thread beat us to it) or if we were |
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|
965 // stalled due to the GC locker. In either can we should retry the |
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|
966 // allocation attempt in case another thread successfully |
abdfc822206f
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|
967 // performed a collection and reclaimed enough space. We do the |
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|
968 // first attempt (without holding the Heap_lock) here and the |
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|
969 // follow-on attempt will be at the start of the next loop |
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|
970 // iteration (after taking the Heap_lock). |
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|
971 result = _mutator_alloc_region.attempt_allocation(word_size, |
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|
972 false /* bot_updates */); |
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|
973 if (result != NULL ){ |
abdfc822206f
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|
974 return result; |
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|
975 } |
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|
976 |
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|
977 // Give a warning if we seem to be looping forever. |
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|
978 if ((QueuedAllocationWarningCount > 0) && |
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|
979 (try_count % QueuedAllocationWarningCount == 0)) { |
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|
980 warning("G1CollectedHeap::attempt_allocation_slow() " |
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|
981 "retries %d times", try_count); |
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|
982 } |
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|
983 } |
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|
984 |
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|
985 ShouldNotReachHere(); |
abdfc822206f
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|
986 return NULL; |
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|
987 } |
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|
988 |
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|
989 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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990 unsigned int * gc_count_before_ret) { |
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|
991 // The structure of this method has a lot of similarities to |
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|
992 // attempt_allocation_slow(). The reason these two were not merged |
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|
993 // into a single one is that such a method would require several "if |
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|
994 // allocation is not humongous do this, otherwise do that" |
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|
995 // conditional paths which would obscure its flow. In fact, an early |
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|
996 // version of this code did use a unified method which was harder to |
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|
997 // follow and, as a result, it had subtle bugs that were hard to |
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998 // track down. So keeping these two methods separate allows each to |
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|
999 // be more readable. It will be good to keep these two in sync as |
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|
1000 // much as possible. |
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|
1001 |
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|
1002 assert_heap_not_locked_and_not_at_safepoint(); |
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|
1003 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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|
1004 "should only be called for humongous allocations"); |
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|
1005 |
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|
1006 // We will loop until a) we manage to successfully perform the |
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|
1007 // allocation or b) we successfully schedule a collection which |
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|
1008 // fails to perform the allocation. b) is the only case when we'll |
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|
1009 // return NULL. |
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|
1010 HeapWord* result = NULL; |
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|
1011 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
1012 bool should_try_gc; |
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|
1013 unsigned int gc_count_before; |
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|
1014 |
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|
1015 { |
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|
1016 MutexLockerEx x(Heap_lock); |
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|
1017 |
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|
1018 // Given that humongous objects are not allocated in young |
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|
1019 // regions, we'll first try to do the allocation without doing a |
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|
1020 // collection hoping that there's enough space in the heap. |
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1021 result = humongous_obj_allocate(word_size); |
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1022 if (result != NULL) { |
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1023 return result; |
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1024 } |
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1025 |
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1026 if (GC_locker::is_active_and_needs_gc()) { |
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1027 should_try_gc = false; |
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1028 } else { |
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1029 // Read the GC count while still holding the Heap_lock. |
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1030 gc_count_before = SharedHeap::heap()->total_collections(); |
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1031 should_try_gc = true; |
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1032 } |
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1033 } |
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1034 |
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1035 if (should_try_gc) { |
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1036 // If we failed to allocate the humongous object, we should try to |
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1037 // do a collection pause (if we're allowed) in case it reclaims |
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1038 // enough space for the allocation to succeed after the pause. |
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1039 |
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1040 bool succeeded; |
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1041 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1042 if (result != NULL) { |
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1043 assert(succeeded, "only way to get back a non-NULL result"); |
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1044 return result; |
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1045 } |
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1046 |
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1047 if (succeeded) { |
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1048 // If we get here we successfully scheduled a collection which |
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1049 // failed to allocate. No point in trying to allocate |
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1050 // further. We'll just return NULL. |
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1051 MutexLockerEx x(Heap_lock); |
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1052 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1053 return NULL; |
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1054 } |
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1055 } else { |
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1056 GC_locker::stall_until_clear(); |
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1057 } |
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1058 |
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1059 // We can reach here if we were unsuccessul in scheduling a |
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1060 // collection (because another thread beat us to it) or if we were |
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1061 // stalled due to the GC locker. In either can we should retry the |
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1062 // allocation attempt in case another thread successfully |
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1063 // performed a collection and reclaimed enough space. Give a |
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1064 // warning if we seem to be looping forever. |
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1065 |
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1066 if ((QueuedAllocationWarningCount > 0) && |
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1067 (try_count % QueuedAllocationWarningCount == 0)) { |
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1068 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1069 "retries %d times", try_count); |
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1070 } |
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1071 } |
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1072 |
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1073 ShouldNotReachHere(); |
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1074 return NULL; |
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1075 } |
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1076 |
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1077 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1078 bool expect_null_mutator_alloc_region) { |
2152 | 1079 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1080 assert(_mutator_alloc_region.get() == NULL || |
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1081 !expect_null_mutator_alloc_region, |
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1082 "the current alloc region was unexpectedly found to be non-NULL"); |
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1083 |
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1084 if (!isHumongous(word_size)) { |
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1085 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1086 false /* bot_updates */); |
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1087 } else { |
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1088 return humongous_obj_allocate(word_size); |
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1089 } |
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1090 |
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1091 ShouldNotReachHere(); |
342 | 1092 } |
1093 | |
1094 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1095 ModRefBarrierSet* _mr_bs; | |
1096 public: | |
1097 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1098 bool doHeapRegion(HeapRegion* r) { | |
1099 r->reset_gc_time_stamp(); | |
1100 if (r->continuesHumongous()) | |
1101 return false; | |
1102 HeapRegionRemSet* hrrs = r->rem_set(); | |
1103 if (hrrs != NULL) hrrs->clear(); | |
1104 // You might think here that we could clear just the cards | |
1105 // corresponding to the used region. But no: if we leave a dirty card | |
1106 // in a region we might allocate into, then it would prevent that card | |
1107 // from being enqueued, and cause it to be missed. | |
1108 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1109 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1110 return false; | |
1111 } | |
1112 }; | |
1113 | |
1114 | |
1115 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1116 ModRefBarrierSet* _mr_bs; | |
1117 public: | |
1118 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1119 bool doHeapRegion(HeapRegion* r) { | |
1120 if (r->continuesHumongous()) return false; | |
1121 if (r->used_region().word_size() != 0) { | |
1122 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1123 } | |
1124 return false; | |
1125 } | |
1126 }; | |
1127 | |
626
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1128 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1129 G1CollectedHeap* _g1h; |
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1130 UpdateRSOopClosure _cl; |
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1131 int _worker_i; |
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1132 public: |
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1133 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1134 _cl(g1->g1_rem_set(), worker_i), |
626
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1135 _worker_i(worker_i), |
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1136 _g1h(g1) |
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1137 { } |
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1138 |
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1139 bool doHeapRegion(HeapRegion* r) { |
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1140 if (!r->continuesHumongous()) { |
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1141 _cl.set_from(r); |
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1142 r->oop_iterate(&_cl); |
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1143 } |
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1144 return false; |
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1145 } |
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1146 }; |
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1147 |
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1148 class ParRebuildRSTask: public AbstractGangTask { |
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1149 G1CollectedHeap* _g1; |
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1150 public: |
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1151 ParRebuildRSTask(G1CollectedHeap* g1) |
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1152 : AbstractGangTask("ParRebuildRSTask"), |
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1153 _g1(g1) |
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1154 { } |
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1155 |
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1156 void work(int i) { |
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1157 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1158 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1159 HeapRegion::RebuildRSClaimValue); |
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1160 } |
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1161 }; |
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1162 |
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1163 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1164 private: |
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1165 G1HRPrinter* _hr_printer; |
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1166 public: |
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1167 bool doHeapRegion(HeapRegion* hr) { |
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1168 assert(!hr->is_young(), "not expecting to find young regions"); |
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1169 // We only generate output for non-empty regions. |
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1170 if (!hr->is_empty()) { |
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1171 if (!hr->isHumongous()) { |
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1172 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1173 } else if (hr->startsHumongous()) { |
3986
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1174 if (hr->capacity() == HeapRegion::GrainBytes) { |
3778
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1175 // single humongous region |
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1176 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1177 } else { |
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1178 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1179 } |
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1180 } else { |
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1181 assert(hr->continuesHumongous(), "only way to get here"); |
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1182 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1183 } |
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1184 } |
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1185 return false; |
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1186 } |
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1187 |
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1188 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1189 : _hr_printer(hr_printer) { } |
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1190 }; |
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1191 |
1973 | 1192 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1193 bool clear_all_soft_refs, |
342 | 1194 size_t word_size) { |
2152 | 1195 assert_at_safepoint(true /* should_be_vm_thread */); |
1196 | |
1359
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1197 if (GC_locker::check_active_before_gc()) { |
1973 | 1198 return false; |
1359
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1199 } |
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1200 |
2125
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|
1201 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1202 ResourceMark rm; |
1203 | |
838
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1204 if (PrintHeapAtGC) { |
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1205 Universe::print_heap_before_gc(); |
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1206 } |
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1207 |
4072 | 1208 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1209 verify_region_sets_optional(); |
342 | 1210 |
1387
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1211 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1212 collector_policy()->should_clear_all_soft_refs(); |
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1213 |
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1214 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1215 |
342 | 1216 { |
1217 IsGCActiveMark x; | |
1218 | |
1219 // Timing | |
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1220 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1221 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1222 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1223 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
1656
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1224 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1225 PrintGC, true, gclog_or_tty); |
342 | 1226 |
3289
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|
1227 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
3356
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1228 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
1089
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1229 |
342 | 1230 double start = os::elapsedTime(); |
1231 g1_policy()->record_full_collection_start(); | |
1232 | |
2152 | 1233 wait_while_free_regions_coming(); |
2361 | 1234 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1235 |
342 | 1236 gc_prologue(true); |
838
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1237 increment_total_collections(true /* full gc */); |
342 | 1238 |
1239 size_t g1h_prev_used = used(); | |
1240 assert(used() == recalculate_used(), "Should be equal"); | |
1241 | |
1242 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1243 HandleMark hm; // Discard invalid handles created during verification | |
2433
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|
1244 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1245 prepare_for_verify(); |
3772
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1246 Universe::verify(/* allow dirty */ true, |
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1247 /* silent */ false, |
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|
1248 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1249 |
342 | 1250 } |
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
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parents:
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diff
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|
1251 pre_full_gc_dump(); |
342 | 1252 |
1253 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1254 | |
3979
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|
1255 // Disable discovery and empty the discovered lists |
4dfb2df418f2
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|
1256 // for the CM ref processor. |
4dfb2df418f2
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|
1257 ref_processor_cm()->disable_discovery(); |
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|
1258 ref_processor_cm()->abandon_partial_discovery(); |
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|
1259 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1260 |
1261 // Abandon current iterations of concurrent marking and concurrent | |
1262 // refinement, if any are in progress. | |
1263 concurrent_mark()->abort(); | |
1264 | |
1265 // Make sure we'll choose a new allocation region afterwards. | |
2433
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|
1266 release_mutator_alloc_region(); |
636 | 1267 abandon_gc_alloc_regions(); |
1861 | 1268 g1_rem_set()->cleanupHRRS(); |
1394
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|
1269 |
3778
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1270 // We should call this after we retire any currently active alloc |
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1271 // regions so that all the ALLOC / RETIRE events are generated |
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1272 // before the start GC event. |
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|
1273 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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|
1274 |
1394
1316cec51b4d
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|
1275 // We may have added regions to the current incremental collection |
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|
1276 // set between the last GC or pause and now. We need to clear the |
1316cec51b4d
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diff
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|
1277 // incremental collection set and then start rebuilding it afresh |
1316cec51b4d
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diff
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|
1278 // after this full GC. |
1316cec51b4d
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diff
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|
1279 abandon_collection_set(g1_policy()->inc_cset_head()); |
1316cec51b4d
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|
1280 g1_policy()->clear_incremental_cset(); |
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diff
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|
1281 g1_policy()->stop_incremental_cset_building(); |
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|
1282 |
4072 | 1283 tear_down_region_sets(false /* free_list_only */); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
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|
1284 g1_policy()->set_full_young_gcs(true); |
342 | 1285 |
3979
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1286 // See the comments in g1CollectedHeap.hpp and |
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|
1287 // G1CollectedHeap::ref_processing_init() about |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1288 // how reference processing currently works in G1. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1289 |
3979
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|
1290 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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|
1291 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
4dfb2df418f2
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|
1292 |
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|
1293 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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|
1294 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
4dfb2df418f2
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|
1295 |
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|
1296 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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|
1297 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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|
1298 |
342 | 1299 // Do collection work |
1300 { | |
1301 HandleMark hm; // Discard invalid handles created during gc | |
3979
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|
1302 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1303 } |
3979
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|
1304 |
2152 | 1305 assert(free_regions() == 0, "we should not have added any free regions"); |
4072 | 1306 rebuild_region_sets(false /* free_list_only */); |
342 | 1307 |
3979
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|
1308 // Enqueue any discovered reference objects that have |
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|
1309 // not been removed from the discovered lists. |
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|
1310 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1311 |
1312 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1313 | |
1089
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diff
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|
1314 MemoryService::track_memory_usage(); |
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|
1315 |
342 | 1316 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1317 HandleMark hm; // Discard invalid handles created during verification | |
1318 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
1319 prepare_for_verify(); |
3772
6747fd0512e0
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changeset
|
1320 Universe::verify(/* allow dirty */ false, |
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|
1321 /* silent */ false, |
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|
1322 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1323 |
342 | 1324 } |
3979
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|
1325 |
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|
1326 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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|
1327 ref_processor_stw()->verify_no_references_recorded(); |
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|
1328 |
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|
1329 // Note: since we've just done a full GC, concurrent |
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|
1330 // marking is no longer active. Therefore we need not |
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diff
changeset
|
1331 // re-enable reference discovery for the CM ref processor. |
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|
1332 // That will be done at the start of the next marking cycle. |
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|
1333 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1334 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1335 |
1336 reset_gc_time_stamp(); | |
1337 // Since everything potentially moved, we will clear all remembered | |
626
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6760309: G1: update remembered sets during Full GCs
apetrusenko
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diff
changeset
|
1338 // sets, and clear all cards. Later we will rebuild remebered |
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diff
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|
1339 // sets. We will also reset the GC time stamps of the regions. |
342 | 1340 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1341 heap_region_iterate(&rs_clear); | |
1342 | |
1343 // Resize the heap if necessary. | |
1656
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|
1344 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1345 |
3778
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1346 if (_hr_printer.is_active()) { |
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1347 // We should do this after we potentially resize the heap so |
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|
1348 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1349 // the end GC event. |
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|
1350 |
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1351 PostCompactionPrinterClosure cl(hr_printer()); |
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1352 heap_region_iterate(&cl); |
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1353 |
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1354 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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1355 } |
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|
1356 |
342 | 1357 if (_cg1r->use_cache()) { |
1358 _cg1r->clear_and_record_card_counts(); | |
1359 _cg1r->clear_hot_cache(); | |
1360 } | |
1361 | |
626
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1362 // Rebuild remembered sets of all regions. |
1833
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1363 |
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1364 if (G1CollectedHeap::use_parallel_gc_threads()) { |
626
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1365 ParRebuildRSTask rebuild_rs_task(this); |
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1366 assert(check_heap_region_claim_values( |
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1367 HeapRegion::InitialClaimValue), "sanity check"); |
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1368 set_par_threads(workers()->total_workers()); |
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1369 workers()->run_task(&rebuild_rs_task); |
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|
1370 set_par_threads(0); |
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|
1371 assert(check_heap_region_claim_values( |
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|
1372 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1373 reset_heap_region_claim_values(); |
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|
1374 } else { |
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|
1375 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1376 heap_region_iterate(&rebuild_rs); |
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|
1377 } |
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1378 |
342 | 1379 if (PrintGC) { |
1380 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1381 } | |
1382 | |
1383 if (true) { // FIXME | |
1384 // Ask the permanent generation to adjust size for full collections | |
1385 perm()->compute_new_size(); | |
1386 } | |
1387 | |
1394
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1388 // Start a new incremental collection set for the next pause |
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|
1389 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1390 g1_policy()->start_incremental_cset_building(); |
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|
1391 |
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|
1392 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1393 // regions to the incremental collection set for the next |
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1394 // evacuation pause. |
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|
1395 clear_cset_fast_test(); |
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|
1396 |
2433
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|
1397 init_mutator_alloc_region(); |
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|
1398 |
342 | 1399 double end = os::elapsedTime(); |
1400 g1_policy()->record_full_collection_end(); | |
1401 | |
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1402 #ifdef TRACESPINNING |
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|
1403 ParallelTaskTerminator::print_termination_counts(); |
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|
1404 #endif |
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1405 |
342 | 1406 gc_epilogue(true); |
1407 | |
794 | 1408 // Discard all rset updates |
1409 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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|
1410 assert(!G1DeferredRSUpdate |
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|
1411 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1412 } |
1413 | |
3867
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1414 _young_list->reset_sampled_info(); |
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1415 // At this point there should be no regions in the |
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1416 // entire heap tagged as young. |
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1417 assert( check_young_list_empty(true /* check_heap */), |
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1418 "young list should be empty at this point"); |
838
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1419 |
1656
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1420 // Update the number of full collections that have been completed. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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1421 increment_full_collections_completed(false /* concurrent */); |
1656
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1422 |
3766 | 1423 _hrs.verify_optional(); |
2152 | 1424 verify_region_sets_optional(); |
1425 | |
838
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1426 if (PrintHeapAtGC) { |
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1427 Universe::print_heap_after_gc(); |
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1428 } |
3980
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|
1429 g1mm()->update_sizes(); |
3869
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1430 post_full_gc_dump(); |
1973 | 1431 |
1432 return true; | |
342 | 1433 } |
1434 | |
1435 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1436 // do_collection() will return whether it succeeded in performing |
1437 // the GC. Currently, there is no facility on the | |
1438 // do_full_collection() API to notify the caller than the collection | |
1439 // did not succeed (e.g., because it was locked out by the GC | |
1440 // locker). So, right now, we'll ignore the return value. | |
1441 bool dummy = do_collection(true, /* explicit_gc */ | |
1442 clear_all_soft_refs, | |
1443 0 /* word_size */); | |
342 | 1444 } |
1445 | |
1446 // This code is mostly copied from TenuredGeneration. | |
1447 void | |
1448 G1CollectedHeap:: | |
1449 resize_if_necessary_after_full_collection(size_t word_size) { | |
1450 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1451 | |
1452 // Include the current allocation, if any, and bytes that will be | |
1453 // pre-allocated to support collections, as "used". | |
1454 const size_t used_after_gc = used(); | |
1455 const size_t capacity_after_gc = capacity(); | |
1456 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1457 | |
1717
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1458 // This is enforced in arguments.cpp. |
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1459 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1460 "otherwise the code below doesn't make sense"); |
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|
1461 |
342 | 1462 // We don't have floating point command-line arguments |
1717
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1463 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1464 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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|
1465 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1466 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1467 | |
1717
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1468 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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|
1469 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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|
1470 |
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|
1471 // We have to be careful here as these two calculations can overflow |
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|
1472 // 32-bit size_t's. |
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|
1473 double used_after_gc_d = (double) used_after_gc; |
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|
1474 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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|
1475 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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|
1476 |
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|
1477 // Let's make sure that they are both under the max heap size, which |
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1478 // by default will make them fit into a size_t. |
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|
1479 double desired_capacity_upper_bound = (double) max_heap_size; |
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|
1480 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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|
1481 desired_capacity_upper_bound); |
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|
1482 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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|
1483 desired_capacity_upper_bound); |
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|
1484 |
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1485 // We can now safely turn them into size_t's. |
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|
1486 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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|
1487 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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|
1488 |
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|
1489 // This assert only makes sense here, before we adjust them |
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|
1490 // with respect to the min and max heap size. |
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|
1491 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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|
1492 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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|
1493 "maximum_desired_capacity = "SIZE_FORMAT, |
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|
1494 minimum_desired_capacity, maximum_desired_capacity)); |
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|
1495 |
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|
1496 // Should not be greater than the heap max size. No need to adjust |
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1497 // it with respect to the heap min size as it's a lower bound (i.e., |
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|
1498 // we'll try to make the capacity larger than it, not smaller). |
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|
1499 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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|
1500 // Should not be less than the heap min size. No need to adjust it |
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|
1501 // with respect to the heap max size as it's an upper bound (i.e., |
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|
1502 // we'll try to make the capacity smaller than it, not greater). |
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|
1503 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1504 |
1717
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1505 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1506 // Don't expand unless it's significant |
1507 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
3914
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|
1508 ergo_verbose4(ErgoHeapSizing, |
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|
1509 "attempt heap expansion", |
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|
1510 ergo_format_reason("capacity lower than " |
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|
1511 "min desired capacity after Full GC") |
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1512 ergo_format_byte("capacity") |
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1513 ergo_format_byte("occupancy") |
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1514 ergo_format_byte_perc("min desired capacity"), |
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1515 capacity_after_gc, used_after_gc, |
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1516 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1517 expand(expand_bytes); |
342 | 1518 |
1519 // No expansion, now see if we want to shrink | |
1717
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1520 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1521 // Capacity too large, compute shrinking size |
1522 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
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1523 ergo_verbose4(ErgoHeapSizing, |
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1524 "attempt heap shrinking", |
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1525 ergo_format_reason("capacity higher than " |
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1526 "max desired capacity after Full GC") |
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1527 ergo_format_byte("capacity") |
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1528 ergo_format_byte("occupancy") |
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1529 ergo_format_byte_perc("max desired capacity"), |
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1530 capacity_after_gc, used_after_gc, |
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1531 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1532 shrink(shrink_bytes); |
1533 } | |
1534 } | |
1535 | |
1536 | |
1537 HeapWord* | |
1973 | 1538 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1539 bool* succeeded) { | |
2152 | 1540 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1541 |
1542 *succeeded = true; | |
1543 // Let's attempt the allocation first. | |
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1544 HeapWord* result = |
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1545 attempt_allocation_at_safepoint(word_size, |
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1546 false /* expect_null_mutator_alloc_region */); |
1973 | 1547 if (result != NULL) { |
1548 assert(*succeeded, "sanity"); | |
1549 return result; | |
1550 } | |
342 | 1551 |
1552 // In a G1 heap, we're supposed to keep allocation from failing by | |
1553 // incremental pauses. Therefore, at least for now, we'll favor | |
1554 // expansion over collection. (This might change in the future if we can | |
1555 // do something smarter than full collection to satisfy a failed alloc.) | |
1556 result = expand_and_allocate(word_size); | |
1557 if (result != NULL) { | |
1973 | 1558 assert(*succeeded, "sanity"); |
342 | 1559 return result; |
1560 } | |
1561 | |
1973 | 1562 // Expansion didn't work, we'll try to do a Full GC. |
1563 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1564 false, /* clear_all_soft_refs */ | |
1565 word_size); | |
1566 if (!gc_succeeded) { | |
1567 *succeeded = false; | |
1568 return NULL; | |
1569 } | |
1570 | |
1571 // Retry the allocation | |
1572 result = attempt_allocation_at_safepoint(word_size, | |
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1573 true /* expect_null_mutator_alloc_region */); |
342 | 1574 if (result != NULL) { |
1973 | 1575 assert(*succeeded, "sanity"); |
342 | 1576 return result; |
1577 } | |
1578 | |
1973 | 1579 // Then, try a Full GC that will collect all soft references. |
1580 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1581 true, /* clear_all_soft_refs */ | |
1582 word_size); | |
1583 if (!gc_succeeded) { | |
1584 *succeeded = false; | |
1585 return NULL; | |
1586 } | |
1587 | |
1588 // Retry the allocation once more | |
1589 result = attempt_allocation_at_safepoint(word_size, | |
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1590 true /* expect_null_mutator_alloc_region */); |
342 | 1591 if (result != NULL) { |
1973 | 1592 assert(*succeeded, "sanity"); |
342 | 1593 return result; |
1594 } | |
1595 | |
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1596 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1597 "Flag should have been handled and cleared prior to this point"); |
1387
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1598 |
342 | 1599 // What else? We might try synchronous finalization later. If the total |
1600 // space available is large enough for the allocation, then a more | |
1601 // complete compaction phase than we've tried so far might be | |
1602 // appropriate. | |
1973 | 1603 assert(*succeeded, "sanity"); |
342 | 1604 return NULL; |
1605 } | |
1606 | |
1607 // Attempting to expand the heap sufficiently | |
1608 // to support an allocation of the given "word_size". If | |
1609 // successful, perform the allocation and return the address of the | |
1610 // allocated block, or else "NULL". | |
1611 | |
1612 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1613 assert_at_safepoint(true /* should_be_vm_thread */); |
1614 | |
1615 verify_region_sets_optional(); | |
1973 | 1616 |
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1617 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1618 ergo_verbose1(ErgoHeapSizing, |
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1619 "attempt heap expansion", |
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1620 ergo_format_reason("allocation request failed") |
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1621 ergo_format_byte("allocation request"), |
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1622 word_size * HeapWordSize); |
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1623 if (expand(expand_bytes)) { |
3766 | 1624 _hrs.verify_optional(); |
2188
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1625 verify_region_sets_optional(); |
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1626 return attempt_allocation_at_safepoint(word_size, |
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1627 false /* expect_null_mutator_alloc_region */); |
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1628 } |
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1629 return NULL; |
342 | 1630 } |
1631 | |
3766 | 1632 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1633 HeapWord* new_end) { | |
1634 assert(old_end != new_end, "don't call this otherwise"); | |
1635 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1636 | |
1637 // Update the committed mem region. | |
1638 _g1_committed.set_end(new_end); | |
1639 // Tell the card table about the update. | |
1640 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1641 // Tell the BOT about the update. | |
1642 _bot_shared->resize(_g1_committed.word_size()); | |
1643 } | |
1644 | |
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1645 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1646 size_t old_mem_size = _g1_storage.committed_size(); |
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1647 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1648 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1649 HeapRegion::GrainBytes); | |
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1650 ergo_verbose2(ErgoHeapSizing, |
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1651 "expand the heap", |
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1652 ergo_format_byte("requested expansion amount") |
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1653 ergo_format_byte("attempted expansion amount"), |
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1654 expand_bytes, aligned_expand_bytes); |
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1655 |
3766 | 1656 // First commit the memory. |
1657 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1658 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1659 if (successful) { |
3766 | 1660 // Then propagate this update to the necessary data structures. |
1661 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1662 update_committed_space(old_end, new_end); | |
1663 | |
1664 FreeRegionList expansion_list("Local Expansion List"); | |
1665 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1666 assert(mr.start() == old_end, "post-condition"); | |
1667 // mr might be a smaller region than what was requested if | |
1668 // expand_by() was unable to allocate the HeapRegion instances | |
1669 assert(mr.end() <= new_end, "post-condition"); | |
1670 | |
1671 size_t actual_expand_bytes = mr.byte_size(); | |
1672 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1673 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1674 "post-condition"); | |
1675 if (actual_expand_bytes < aligned_expand_bytes) { | |
1676 // We could not expand _hrs to the desired size. In this case we | |
1677 // need to shrink the committed space accordingly. | |
1678 assert(mr.end() < new_end, "invariant"); | |
1679 | |
1680 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1681 // First uncommit the memory. | |
1682 _g1_storage.shrink_by(diff_bytes); | |
1683 // Then propagate this update to the necessary data structures. | |
1684 update_committed_space(new_end, mr.end()); | |
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1685 } |
3766 | 1686 _free_list.add_as_tail(&expansion_list); |
3778
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1687 |
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1688 if (_hr_printer.is_active()) { |
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1689 HeapWord* curr = mr.start(); |
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1690 while (curr < mr.end()) { |
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1691 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1692 _hr_printer.commit(curr, curr_end); |
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1693 curr = curr_end; |
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1694 } |
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1695 assert(curr == mr.end(), "post-condition"); |
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1696 } |
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1697 g1_policy()->record_new_heap_size(n_regions()); |
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1698 } else { |
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1699 ergo_verbose0(ErgoHeapSizing, |
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1700 "did not expand the heap", |
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1701 ergo_format_reason("heap expansion operation failed")); |
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1702 // The expansion of the virtual storage space was unsuccessful. |
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1703 // Let's see if it was because we ran out of swap. |
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1704 if (G1ExitOnExpansionFailure && |
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1705 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1706 // We had head room... |
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1707 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1708 } |
1709 } | |
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1710 return successful; |
342 | 1711 } |
1712 | |
3766 | 1713 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1714 size_t old_mem_size = _g1_storage.committed_size(); |
1715 size_t aligned_shrink_bytes = | |
1716 ReservedSpace::page_align_size_down(shrink_bytes); | |
1717 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1718 HeapRegion::GrainBytes); | |
1719 size_t num_regions_deleted = 0; | |
3766 | 1720 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1721 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1722 assert(mr.end() == old_end, "post-condition"); | |
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1723 |
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1724 ergo_verbose3(ErgoHeapSizing, |
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1725 "shrink the heap", |
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1726 ergo_format_byte("requested shrinking amount") |
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1727 ergo_format_byte("aligned shrinking amount") |
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1728 ergo_format_byte("attempted shrinking amount"), |
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1729 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1730 if (mr.byte_size() > 0) { |
3778
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1731 if (_hr_printer.is_active()) { |
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1732 HeapWord* curr = mr.end(); |
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1733 while (curr > mr.start()) { |
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1734 HeapWord* curr_end = curr; |
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1735 curr -= HeapRegion::GrainWords; |
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1736 _hr_printer.uncommit(curr, curr_end); |
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1737 } |
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1738 assert(curr == mr.start(), "post-condition"); |
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1739 } |
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1740 |
342 | 1741 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1742 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1743 assert(mr.start() == new_end, "post-condition"); | |
1744 | |
1745 _expansion_regions += num_regions_deleted; | |
1746 update_committed_space(old_end, new_end); | |
1747 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1748 g1_policy()->record_new_heap_size(n_regions()); |
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1749 } else { |
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1750 ergo_verbose0(ErgoHeapSizing, |
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1751 "did not shrink the heap", |
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1752 ergo_format_reason("heap shrinking operation failed")); |
342 | 1753 } |
1754 } | |
1755 | |
1756 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1757 verify_region_sets_optional(); |
1758 | |
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1759 // We should only reach here at the end of a Full GC which means we |
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1760 // should not not be holding to any GC alloc regions. The method |
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1761 // below will make sure of that and do any remaining clean up. |
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1762 abandon_gc_alloc_regions(); |
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1763 |
2152 | 1764 // Instead of tearing down / rebuilding the free lists here, we |
1765 // could instead use the remove_all_pending() method on free_list to | |
1766 // remove only the ones that we need to remove. | |
4072 | 1767 tear_down_region_sets(true /* free_list_only */); |
342 | 1768 shrink_helper(shrink_bytes); |
4072 | 1769 rebuild_region_sets(true /* free_list_only */); |
2152 | 1770 |
3766 | 1771 _hrs.verify_optional(); |
2152 | 1772 verify_region_sets_optional(); |
342 | 1773 } |
1774 | |
1775 // Public methods. | |
1776 | |
1777 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1778 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1779 #endif // _MSC_VER | |
1780 | |
1781 | |
1782 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1783 SharedHeap(policy_), | |
1784 _g1_policy(policy_), | |
1111 | 1785 _dirty_card_queue_set(false), |
1705 | 1786 _into_cset_dirty_card_queue_set(false), |
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1787 _is_alive_closure_cm(this), |
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1788 _is_alive_closure_stw(this), |
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1789 _ref_processor_cm(NULL), |
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1790 _ref_processor_stw(NULL), |
342 | 1791 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1792 _bot_shared(NULL), | |
1793 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1794 _evac_failure_scan_stack(NULL) , | |
1795 _mark_in_progress(false), | |
2152 | 1796 _cg1r(NULL), _summary_bytes_used(0), |
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1797 _g1mm(NULL), |
342 | 1798 _refine_cte_cl(NULL), |
1799 _full_collection(false), | |
2152 | 1800 _free_list("Master Free List"), |
1801 _secondary_free_list("Secondary Free List"), | |
4072 | 1802 _old_set("Old Set"), |
2152 | 1803 _humongous_set("Master Humongous Set"), |
1804 _free_regions_coming(false), | |
342 | 1805 _young_list(new YoungList(this)), |
1806 _gc_time_stamp(0), | |
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1807 _retained_old_gc_alloc_region(NULL), |
526 | 1808 _surviving_young_words(NULL), |
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1809 _full_collections_completed(0), |
526 | 1810 _in_cset_fast_test(NULL), |
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1811 _in_cset_fast_test_base(NULL), |
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1812 _dirty_cards_region_list(NULL) { |
342 | 1813 _g1h = this; // To catch bugs. |
1814 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1815 vm_exit_during_initialization("Failed necessary allocation."); | |
1816 } | |
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1817 |
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1818 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1819 |
342 | 1820 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1821 _task_queues = new RefToScanQueueSet(n_queues); | |
1822 | |
1823 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1824 assert(n_rem_sets > 0, "Invariant."); | |
1825 | |
1826 HeapRegionRemSetIterator** iter_arr = | |
1827 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1828 for (int i = 0; i < n_queues; i++) { | |
1829 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1830 } | |
1831 _rem_set_iterator = iter_arr; | |
1832 | |
1833 for (int i = 0; i < n_queues; i++) { | |
1834 RefToScanQueue* q = new RefToScanQueue(); | |
1835 q->initialize(); | |
1836 _task_queues->register_queue(i, q); | |
1837 } | |
1838 | |
1839 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
1840 } | |
1841 | |
1842 jint G1CollectedHeap::initialize() { | |
1166 | 1843 CollectedHeap::pre_initialize(); |
342 | 1844 os::enable_vtime(); |
1845 | |
1846 // Necessary to satisfy locking discipline assertions. | |
1847 | |
1848 MutexLocker x(Heap_lock); | |
1849 | |
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1850 // We have to initialize the printer before committing the heap, as |
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1851 // it will be used then. |
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1852 _hr_printer.set_active(G1PrintHeapRegions); |
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1853 |
342 | 1854 // While there are no constraints in the GC code that HeapWordSize |
1855 // be any particular value, there are multiple other areas in the | |
1856 // system which believe this to be true (e.g. oop->object_size in some | |
1857 // cases incorrectly returns the size in wordSize units rather than | |
1858 // HeapWordSize). | |
1859 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1860 | |
1861 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1862 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1863 | |
1864 // Ensure that the sizes are properly aligned. | |
1865 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1866 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1867 | |
1868 _cg1r = new ConcurrentG1Refine(); | |
1869 | |
1870 // Reserve the maximum. | |
1871 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1872 // Includes the perm-gen. | |
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1873 |
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1874 // When compressed oops are enabled, the preferred heap base |
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1875 // is calculated by subtracting the requested size from the |
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1876 // 32Gb boundary and using the result as the base address for |
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1877 // heap reservation. If the requested size is not aligned to |
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1878 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1879 // into the ReservedHeapSpace constructor) then the actual |
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1880 // base of the reserved heap may end up differing from the |
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1881 // address that was requested (i.e. the preferred heap base). |
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1882 // If this happens then we could end up using a non-optimal |
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1883 // compressed oops mode. |
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1884 |
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1885 // Since max_byte_size is aligned to the size of a heap region (checked |
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1886 // above), we also need to align the perm gen size as it might not be. |
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1887 const size_t total_reserved = max_byte_size + |
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1888 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1889 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1890 |
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1891 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1892 |
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1893 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1894 UseLargePages, addr); |
642
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1895 |
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1896 if (UseCompressedOops) { |
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1897 if (addr != NULL && !heap_rs.is_reserved()) { |
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1898 // Failed to reserve at specified address - the requested memory |
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1899 // region is taken already, for example, by 'java' launcher. |
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1900 // Try again to reserver heap higher. |
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1901 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1902 |
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1903 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1904 UseLargePages, addr); |
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1905 |
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1906 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1907 // Failed to reserve at specified address again - give up. |
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1908 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1909 assert(addr == NULL, ""); |
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1910 |
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1911 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1912 UseLargePages, addr); |
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1913 heap_rs = heap_rs1; |
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1914 } else { |
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1915 heap_rs = heap_rs0; |
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1916 } |
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1917 } |
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1918 } |
342 | 1919 |
1920 if (!heap_rs.is_reserved()) { | |
1921 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1922 return JNI_ENOMEM; | |
1923 } | |
1924 | |
1925 // It is important to do this in a way such that concurrent readers can't | |
1926 // temporarily think somethings in the heap. (I've actually seen this | |
1927 // happen in asserts: DLD.) | |
1928 _reserved.set_word_size(0); | |
1929 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1930 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1931 | |
1932 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1933 | |
1934 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1935 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1936 set_barrier_set(rem_set()->bs()); | |
1937 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1938 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1939 } else { | |
1940 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1941 return JNI_ENOMEM; | |
1942 } | |
1943 | |
1944 // Also create a G1 rem set. | |
1861 | 1945 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
1946 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 1947 } else { |
1861 | 1948 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
1949 return JNI_ENOMEM; | |
342 | 1950 } |
1951 | |
1952 // Carve out the G1 part of the heap. | |
1953 | |
1954 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1955 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1956 g1_rs.size()/HeapWordSize); | |
1957 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1958 | |
1959 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1960 | |
1961 _g1_storage.initialize(g1_rs, 0); | |
1962 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 1963 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
1964 (HeapWord*) _g1_reserved.end(), | |
1965 _expansion_regions); | |
342 | 1966 |
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1967 // 6843694 - ensure that the maximum region index can fit |
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1968 // in the remembered set structures. |
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1969 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1970 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1971 |
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1972 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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1973 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
1974 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
942
2c79770d1f6e
6819085: G1: use larger and/or user settable region size
tonyp
parents:
941
diff
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|
1975 "too many cards per region"); |
807
d44bdab1c03d
6843694: G1: assert(index < _vs.committed_size(),"bad index"), g1BlockOffsetTable.inline.hpp:55
johnc
parents:
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|
1976 |
2152 | 1977 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
1978 | |
342 | 1979 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
1980 heap_word_size(init_byte_size)); | |
1981 | |
1982 _g1h = this; | |
1983 | |
1394
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|
1984 _in_cset_fast_test_length = max_regions(); |
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|
1985 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
1316cec51b4d
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|
1986 |
1316cec51b4d
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diff
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|
1987 // We're biasing _in_cset_fast_test to avoid subtracting the |
1316cec51b4d
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parents:
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diff
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|
1988 // beginning of the heap every time we want to index; basically |
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parents:
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diff
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|
1989 // it's the same with what we do with the card table. |
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parents:
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|
1990 _in_cset_fast_test = _in_cset_fast_test_base - |
1316cec51b4d
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changeset
|
1991 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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parents:
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diff
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|
1992 |
1316cec51b4d
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parents:
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diff
changeset
|
1993 // Clear the _cset_fast_test bitmap in anticipation of adding |
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parents:
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diff
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|
1994 // regions to the incremental collection set for the first |
1316cec51b4d
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johnc
parents:
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|
1995 // evacuation pause. |
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parents:
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|
1996 clear_cset_fast_test(); |
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|
1997 |
342 | 1998 // Create the ConcurrentMark data structure and thread. |
1999 // (Must do this late, so that "max_regions" is defined.) | |
2000 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2001 _cmThread = _cm->cmThread(); | |
2002 | |
2003 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2004 HeapRegionRemSet::init_heap(max_regions()); | |
2005 | |
677 | 2006 // Now expand into the initial heap size. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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parents:
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|
2007 if (!expand(init_byte_size)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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parents:
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diff
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|
2008 vm_exit_during_initialization("Failed to allocate initial heap."); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
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diff
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|
2009 return JNI_ENOMEM; |
c33825b68624
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parents:
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|
2010 } |
342 | 2011 |
2012 // Perform any initialization actions delegated to the policy. | |
2013 g1_policy()->init(); | |
2014 | |
2015 _refine_cte_cl = | |
2016 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2017 g1_rem_set(), | |
2018 concurrent_g1_refine()); | |
2019 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2020 | |
2021 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2022 SATB_Q_FL_lock, | |
1111 | 2023 G1SATBProcessCompletedThreshold, |
342 | 2024 Shared_SATB_Q_lock); |
794 | 2025 |
2026 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2027 DirtyCardQ_FL_lock, | |
1111 | 2028 concurrent_g1_refine()->yellow_zone(), |
2029 concurrent_g1_refine()->red_zone(), | |
794 | 2030 Shared_DirtyCardQ_lock); |
2031 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
changeset
|
2032 if (G1DeferredRSUpdate) { |
4f360ec815ba
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parents:
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diff
changeset
|
2033 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
4f360ec815ba
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iveresov
parents:
595
diff
changeset
|
2034 DirtyCardQ_FL_lock, |
1111 | 2035 -1, // never trigger processing |
2036 -1, // no limit on length | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
2037 Shared_DirtyCardQ_lock, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2038 &JavaThread::dirty_card_queue_set()); |
4f360ec815ba
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iveresov
parents:
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diff
changeset
|
2039 } |
1705 | 2040 |
2041 // Initialize the card queue set used to hold cards containing | |
2042 // references into the collection set. | |
2043 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2044 DirtyCardQ_FL_lock, | |
2045 -1, // never trigger processing | |
2046 -1, // no limit on length | |
2047 Shared_DirtyCardQ_lock, | |
2048 &JavaThread::dirty_card_queue_set()); | |
2049 | |
342 | 2050 // In case we're keeping closure specialization stats, initialize those |
2051 // counts and that mechanism. | |
2052 SpecializationStats::clear(); | |
2053 | |
2054 // Do later initialization work for concurrent refinement. | |
2055 _cg1r->init(); | |
2056 | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
changeset
|
2057 // Here we allocate the dummy full region that is required by the |
abdfc822206f
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parents:
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diff
changeset
|
2058 // G1AllocRegion class. If we don't pass an address in the reserved |
abdfc822206f
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tonyp
parents:
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diff
changeset
|
2059 // space here, lots of asserts fire. |
3766 | 2060 |
2061 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2062 _g1_reserved.start()); | |
2433
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parents:
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diff
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|
2063 // We'll re-use the same region whether the alloc region will |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
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|
2064 // require BOT updates or not and, if it doesn't, then a non-young |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
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|
2065 // region will complain that it cannot support allocations without |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
changeset
|
2066 // BOT updates. So we'll tag the dummy region as young to avoid that. |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2067 dummy_region->set_young(); |
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
2068 // Make sure it's full. |
abdfc822206f
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tonyp
parents:
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diff
changeset
|
2069 dummy_region->set_top(dummy_region->end()); |
abdfc822206f
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tonyp
parents:
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diff
changeset
|
2070 G1AllocRegion::setup(this, dummy_region); |
abdfc822206f
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tonyp
parents:
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diff
changeset
|
2071 |
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
2072 init_mutator_alloc_region(); |
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
2073 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2074 // Do create of the monitoring and management support so that |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2075 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
2076 _g1mm = new G1MonitoringSupport(this); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
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|
2077 |
342 | 2078 return JNI_OK; |
2079 } | |
2080 | |
2081 void G1CollectedHeap::ref_processing_init() { | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2082 // Reference processing in G1 currently works as follows: |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2083 // |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2084 // * There are two reference processor instances. One is |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2085 // used to record and process discovered references |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2086 // during concurrent marking; the other is used to |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2087 // record and process references during STW pauses |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2088 // (both full and incremental). |
4dfb2df418f2
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parents:
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diff
changeset
|
2089 // * Both ref processors need to 'span' the entire heap as |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2090 // the regions in the collection set may be dotted around. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2091 // |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2092 // * For the concurrent marking ref processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2093 // * Reference discovery is enabled at initial marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2094 // * Reference discovery is disabled and the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2095 // references processed etc during remarking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2096 // * Reference discovery is MT (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2097 // * Reference discovery requires a barrier (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2098 // * Reference processing may or may not be MT |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2099 // (depending on the value of ParallelRefProcEnabled |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2100 // and ParallelGCThreads). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2101 // * A full GC disables reference discovery by the CM |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2102 // ref processor and abandons any entries on it's |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2103 // discovered lists. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2104 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2105 // * For the STW processor: |
4dfb2df418f2
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parents:
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diff
changeset
|
2106 // * Non MT discovery is enabled at the start of a full GC. |
4dfb2df418f2
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parents:
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|
2107 // * Processing and enqueueing during a full GC is non-MT. |
4dfb2df418f2
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parents:
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diff
changeset
|
2108 // * During a full GC, references are processed after marking. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2109 // |
4dfb2df418f2
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diff
changeset
|
2110 // * Discovery (may or may not be MT) is enabled at the start |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2111 // of an incremental evacuation pause. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2112 // * References are processed near the end of a STW evacuation pause. |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2113 // * For both types of GC: |
4dfb2df418f2
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parents:
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diff
changeset
|
2114 // * Discovery is atomic - i.e. not concurrent. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2115 // * Reference discovery will not need a barrier. |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2116 |
342 | 2117 SharedHeap::ref_processing_init(); |
2118 MemRegion mr = reserved_region(); | |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
2119 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2120 // Concurrent Mark ref processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2121 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2122 new ReferenceProcessor(mr, // span |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2123 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2124 // mt processing |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2125 (int) ParallelGCThreads, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2126 // degree of mt processing |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2127 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2128 // mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2129 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2130 // degree of mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2131 false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2132 // Reference discovery is not atomic |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2133 &_is_alive_closure_cm, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2134 // is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2135 // (for efficiency/performance) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2136 true); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2137 // Setting next fields of discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2138 // lists requires a barrier. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2139 |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2140 // STW ref processor |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2141 _ref_processor_stw = |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2142 new ReferenceProcessor(mr, // span |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2143 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2144 // mt processing |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2145 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2146 // degree of mt processing |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2147 (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2148 // mt discovery |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2149 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2150 // degree of mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2151 true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2152 // Reference discovery is atomic |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2153 &_is_alive_closure_stw, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2154 // is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2155 // (for efficiency/performance) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2156 false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2157 // Setting next fields of discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2158 // lists requires a barrier. |
342 | 2159 } |
2160 | |
2161 size_t G1CollectedHeap::capacity() const { | |
2162 return _g1_committed.byte_size(); | |
2163 } | |
2164 | |
1705 | 2165 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2166 DirtyCardQueue* into_cset_dcq, | |
2167 bool concurrent, | |
342 | 2168 int worker_i) { |
889 | 2169 // Clean cards in the hot card cache |
1705 | 2170 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2171 |
342 | 2172 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2173 int n_completed_buffers = 0; | |
1705 | 2174 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2175 n_completed_buffers++; |
2176 } | |
2177 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2178 (double) n_completed_buffers); | |
2179 dcqs.clear_n_completed_buffers(); | |
2180 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2181 } | |
2182 | |
2183 | |
2184 // Computes the sum of the storage used by the various regions. | |
2185 | |
2186 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2187 assert(Heap_lock->owner() != NULL, |
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2188 "Should be owned on this thread's behalf."); |
342 | 2189 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2190 // Read only once in case it is set to NULL concurrently |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2191 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2192 if (hr != NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2193 result += hr->used(); |
342 | 2194 return result; |
2195 } | |
2196 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2197 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2198 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2199 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2200 } |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2201 |
342 | 2202 class SumUsedClosure: public HeapRegionClosure { |
2203 size_t _used; | |
2204 public: | |
2205 SumUsedClosure() : _used(0) {} | |
2206 bool doHeapRegion(HeapRegion* r) { | |
2207 if (!r->continuesHumongous()) { | |
2208 _used += r->used(); | |
2209 } | |
2210 return false; | |
2211 } | |
2212 size_t result() { return _used; } | |
2213 }; | |
2214 | |
2215 size_t G1CollectedHeap::recalculate_used() const { | |
2216 SumUsedClosure blk; | |
3766 | 2217 heap_region_iterate(&blk); |
342 | 2218 return blk.result(); |
2219 } | |
2220 | |
2221 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2222 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2223 // otherwise, is there space in the current allocation region? |
2224 | |
2225 // We need to store the current allocation region in a local variable | |
2226 // here. The problem is that this method doesn't take any locks and | |
2227 // there may be other threads which overwrite the current allocation | |
2228 // region field. attempt_allocation(), for example, sets it to NULL | |
2229 // and this can happen *after* the NULL check here but before the call | |
2230 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2231 // to be a problem in the optimized build, since the two loads of the | |
2232 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2233 HeapRegion* hr = _mutator_alloc_region.get(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2234 if (hr == NULL) { |
342 | 2235 return 0; |
2236 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2237 return hr->free(); |
342 | 2238 } |
2239 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2240 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2241 return |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2242 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2243 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2244 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2245 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2246 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2247 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2248 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2249 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2250 // 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
|
2251 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2252 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2253 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2254 // 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
|
2255 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2256 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2257 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2258 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2259 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2260 // 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
|
2261 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2262 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2263 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2264 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2265 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2266 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2267 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2268 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2269 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2270 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2271 // 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
|
2272 // 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
|
2273 // 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
|
2274 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2275 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2276 // 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
|
2277 // 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
|
2278 // collections have been started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2279 unsigned int full_collections_started = total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2280 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2281 // 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
|
2282 // 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
|
2283 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2284 // 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
|
2285 // 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
|
2286 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2287 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2288 // 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
|
2289 assert(concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2290 (full_collections_started == _full_collections_completed + 1) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2291 (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
|
2292 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
|
2293 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2294 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2295 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2296 // 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
|
2297 assert(!concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2298 (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
|
2299 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
|
2300 "full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2301 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2302 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2303 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2304 _full_collections_completed += 1; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2305 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2306 // 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
|
2307 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2308 // 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
|
2309 // 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
|
2310 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2311 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2312 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2313 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2314 // 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
|
2315 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2316 // 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
|
2317 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2318 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2319 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2320 |
342 | 2321 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2322 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2323 GCCauseSetter gcs(this, cause); |
2324 switch (cause) { | |
2325 case GCCause::_heap_inspection: | |
2326 case GCCause::_heap_dump: { | |
2327 HandleMark hm; | |
2328 do_full_collection(false); // don't clear all soft refs | |
2329 break; | |
2330 } | |
2331 default: // XXX FIX ME | |
2332 ShouldNotReachHere(); // Unexpected use of this function | |
2333 } | |
2334 } | |
2335 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2336 void G1CollectedHeap::collect(GCCause::Cause cause) { |
3fc996d4edd2
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2337 // The caller doesn't have the Heap_lock |
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2338 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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2339 |
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2340 unsigned int gc_count_before; |
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2341 unsigned int full_gc_count_before; |
342 | 2342 { |
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2343 MutexLocker ml(Heap_lock); |
1973 | 2344 |
1088
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2345 // Read the GC count while holding the Heap_lock |
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2346 gc_count_before = SharedHeap::heap()->total_collections(); |
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2347 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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2348 } |
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2349 |
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2350 if (should_do_concurrent_full_gc(cause)) { |
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2351 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2352 // concurrent cycle. We're setting word_size to 0 which means that |
2353 // we are not requesting a post-GC allocation. | |
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2354 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2355 0, /* word_size */ |
2356 true, /* should_initiate_conc_mark */ | |
1656
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2357 g1_policy()->max_pause_time_ms(), |
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2358 cause); |
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2359 VMThread::execute(&op); |
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2360 } else { |
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2361 if (cause == GCCause::_gc_locker |
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2362 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2363 |
1973 | 2364 // Schedule a standard evacuation pause. We're setting word_size |
2365 // to 0 which means that we are not requesting a post-GC allocation. | |
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2366 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2367 0, /* word_size */ |
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2368 false, /* should_initiate_conc_mark */ |
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2369 g1_policy()->max_pause_time_ms(), |
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2370 cause); |
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2371 VMThread::execute(&op); |
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2372 } else { |
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2373 // Schedule a Full GC. |
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2374 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2375 VMThread::execute(&op); |
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2376 } |
342 | 2377 } |
2378 } | |
2379 | |
2380 bool G1CollectedHeap::is_in(const void* p) const { | |
3766 | 2381 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
2382 if (hr != NULL) { | |
342 | 2383 return hr->is_in(p); |
2384 } else { | |
2385 return _perm_gen->as_gen()->is_in(p); | |
2386 } | |
2387 } | |
2388 | |
2389 // Iteration functions. | |
2390 | |
2391 // Iterates an OopClosure over all ref-containing fields of objects | |
2392 // within a HeapRegion. | |
2393 | |
2394 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2395 MemRegion _mr; | |
2396 OopClosure* _cl; | |
2397 public: | |
2398 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2399 : _mr(mr), _cl(cl) {} | |
2400 bool doHeapRegion(HeapRegion* r) { | |
2401 if (! r->continuesHumongous()) { | |
2402 r->oop_iterate(_cl); | |
2403 } | |
2404 return false; | |
2405 } | |
2406 }; | |
2407 | |
678 | 2408 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2409 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2410 heap_region_iterate(&blk); |
678 | 2411 if (do_perm) { |
2412 perm_gen()->oop_iterate(cl); | |
2413 } | |
342 | 2414 } |
2415 | |
678 | 2416 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2417 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2418 heap_region_iterate(&blk); |
678 | 2419 if (do_perm) { |
2420 perm_gen()->oop_iterate(cl); | |
2421 } | |
342 | 2422 } |
2423 | |
2424 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2425 | |
2426 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2427 ObjectClosure* _cl; | |
2428 public: | |
2429 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2430 bool doHeapRegion(HeapRegion* r) { | |
2431 if (! r->continuesHumongous()) { | |
2432 r->object_iterate(_cl); | |
2433 } | |
2434 return false; | |
2435 } | |
2436 }; | |
2437 | |
678 | 2438 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2439 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2440 heap_region_iterate(&blk); |
678 | 2441 if (do_perm) { |
2442 perm_gen()->object_iterate(cl); | |
2443 } | |
342 | 2444 } |
2445 | |
2446 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2447 // FIXME: is this right? | |
2448 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2449 } | |
2450 | |
2451 // Calls a SpaceClosure on a HeapRegion. | |
2452 | |
2453 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2454 SpaceClosure* _cl; | |
2455 public: | |
2456 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2457 bool doHeapRegion(HeapRegion* r) { | |
2458 _cl->do_space(r); | |
2459 return false; | |
2460 } | |
2461 }; | |
2462 | |
2463 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2464 SpaceClosureRegionClosure blk(cl); | |
3766 | 2465 heap_region_iterate(&blk); |
342 | 2466 } |
2467 | |
3766 | 2468 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2469 _hrs.iterate(cl); | |
342 | 2470 } |
2471 | |
2472 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2473 HeapRegionClosure* cl) const { |
2474 _hrs.iterate_from(r, cl); | |
342 | 2475 } |
2476 | |
2477 void | |
2478 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
2479 int worker, | |
2480 jint claim_value) { | |
355 | 2481 const size_t regions = n_regions(); |
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2482 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
355 | 2483 // try to spread out the starting points of the workers |
2484 const size_t start_index = regions / worker_num * (size_t) worker; | |
2485 | |
2486 // each worker will actually look at all regions | |
2487 for (size_t count = 0; count < regions; ++count) { | |
2488 const size_t index = (start_index + count) % regions; | |
2489 assert(0 <= index && index < regions, "sanity"); | |
2490 HeapRegion* r = region_at(index); | |
2491 // we'll ignore "continues humongous" regions (we'll process them | |
2492 // when we come across their corresponding "start humongous" | |
2493 // region) and regions already claimed | |
2494 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2495 continue; | |
2496 } | |
2497 // OK, try to claim it | |
342 | 2498 if (r->claimHeapRegion(claim_value)) { |
355 | 2499 // success! |
2500 assert(!r->continuesHumongous(), "sanity"); | |
2501 if (r->startsHumongous()) { | |
2502 // If the region is "starts humongous" we'll iterate over its | |
2503 // "continues humongous" first; in fact we'll do them | |
2504 // first. The order is important. In on case, calling the | |
2505 // closure on the "starts humongous" region might de-allocate | |
2506 // and clear all its "continues humongous" regions and, as a | |
2507 // result, we might end up processing them twice. So, we'll do | |
2508 // them first (notice: most closures will ignore them anyway) and | |
2509 // then we'll do the "starts humongous" region. | |
2510 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2511 HeapRegion* chr = region_at(ch_index); | |
2512 | |
2513 // if the region has already been claimed or it's not | |
2514 // "continues humongous" we're done | |
2515 if (chr->claim_value() == claim_value || | |
2516 !chr->continuesHumongous()) { | |
2517 break; | |
2518 } | |
2519 | |
2520 // Noone should have claimed it directly. We can given | |
2521 // that we claimed its "starts humongous" region. | |
2522 assert(chr->claim_value() != claim_value, "sanity"); | |
2523 assert(chr->humongous_start_region() == r, "sanity"); | |
2524 | |
2525 if (chr->claimHeapRegion(claim_value)) { | |
2526 // we should always be able to claim it; noone else should | |
2527 // be trying to claim this region | |
2528 | |
2529 bool res2 = cl->doHeapRegion(chr); | |
2530 assert(!res2, "Should not abort"); | |
2531 | |
2532 // Right now, this holds (i.e., no closure that actually | |
2533 // does something with "continues humongous" regions | |
2534 // clears them). We might have to weaken it in the future, | |
2535 // but let's leave these two asserts here for extra safety. | |
2536 assert(chr->continuesHumongous(), "should still be the case"); | |
2537 assert(chr->humongous_start_region() == r, "sanity"); | |
2538 } else { | |
2539 guarantee(false, "we should not reach here"); | |
2540 } | |
2541 } | |
2542 } | |
2543 | |
2544 assert(!r->continuesHumongous(), "sanity"); | |
2545 bool res = cl->doHeapRegion(r); | |
2546 assert(!res, "Should not abort"); | |
2547 } | |
2548 } | |
2549 } | |
2550 | |
390 | 2551 class ResetClaimValuesClosure: public HeapRegionClosure { |
2552 public: | |
2553 bool doHeapRegion(HeapRegion* r) { | |
2554 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2555 return false; | |
2556 } | |
2557 }; | |
2558 | |
2559 void | |
2560 G1CollectedHeap::reset_heap_region_claim_values() { | |
2561 ResetClaimValuesClosure blk; | |
2562 heap_region_iterate(&blk); | |
2563 } | |
2564 | |
355 | 2565 #ifdef ASSERT |
2566 // This checks whether all regions in the heap have the correct claim | |
2567 // value. I also piggy-backed on this a check to ensure that the | |
2568 // humongous_start_region() information on "continues humongous" | |
2569 // regions is correct. | |
2570 | |
2571 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2572 private: | |
2573 jint _claim_value; | |
2574 size_t _failures; | |
2575 HeapRegion* _sh_region; | |
2576 public: | |
2577 CheckClaimValuesClosure(jint claim_value) : | |
2578 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2579 bool doHeapRegion(HeapRegion* r) { | |
2580 if (r->claim_value() != _claim_value) { | |
2581 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2582 "claim value = %d, should be %d", | |
2583 r->bottom(), r->end(), r->claim_value(), | |
2584 _claim_value); | |
2585 ++_failures; | |
2586 } | |
2587 if (!r->isHumongous()) { | |
2588 _sh_region = NULL; | |
2589 } else if (r->startsHumongous()) { | |
2590 _sh_region = r; | |
2591 } else if (r->continuesHumongous()) { | |
2592 if (r->humongous_start_region() != _sh_region) { | |
2593 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2594 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2595 r->bottom(), r->end(), | |
2596 r->humongous_start_region(), | |
2597 _sh_region); | |
2598 ++_failures; | |
342 | 2599 } |
2600 } | |
355 | 2601 return false; |
2602 } | |
2603 size_t failures() { | |
2604 return _failures; | |
2605 } | |
2606 }; | |
2607 | |
2608 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2609 CheckClaimValuesClosure cl(claim_value); | |
2610 heap_region_iterate(&cl); | |
2611 return cl.failures() == 0; | |
2612 } | |
2613 #endif // ASSERT | |
342 | 2614 |
2615 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2616 HeapRegion* r = g1_policy()->collection_set(); | |
2617 while (r != NULL) { | |
2618 HeapRegion* next = r->next_in_collection_set(); | |
2619 if (cl->doHeapRegion(r)) { | |
2620 cl->incomplete(); | |
2621 return; | |
2622 } | |
2623 r = next; | |
2624 } | |
2625 } | |
2626 | |
2627 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2628 HeapRegionClosure *cl) { | |
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2629 if (r == NULL) { |
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2630 // The CSet is empty so there's nothing to do. |
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2631 return; |
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|
2632 } |
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2633 |
342 | 2634 assert(r->in_collection_set(), |
2635 "Start region must be a member of the collection set."); | |
2636 HeapRegion* cur = r; | |
2637 while (cur != NULL) { | |
2638 HeapRegion* next = cur->next_in_collection_set(); | |
2639 if (cl->doHeapRegion(cur) && false) { | |
2640 cl->incomplete(); | |
2641 return; | |
2642 } | |
2643 cur = next; | |
2644 } | |
2645 cur = g1_policy()->collection_set(); | |
2646 while (cur != r) { | |
2647 HeapRegion* next = cur->next_in_collection_set(); | |
2648 if (cl->doHeapRegion(cur) && false) { | |
2649 cl->incomplete(); | |
2650 return; | |
2651 } | |
2652 cur = next; | |
2653 } | |
2654 } | |
2655 | |
2656 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2657 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2658 } |
2659 | |
2660 | |
2661 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2662 Space* res = heap_region_containing(addr); | |
2663 if (res == NULL) | |
2664 res = perm_gen()->space_containing(addr); | |
2665 return res; | |
2666 } | |
2667 | |
2668 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2669 Space* sp = space_containing(addr); | |
2670 if (sp != NULL) { | |
2671 return sp->block_start(addr); | |
2672 } | |
2673 return NULL; | |
2674 } | |
2675 | |
2676 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2677 Space* sp = space_containing(addr); | |
2678 assert(sp != NULL, "block_size of address outside of heap"); | |
2679 return sp->block_size(addr); | |
2680 } | |
2681 | |
2682 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2683 Space* sp = space_containing(addr); | |
2684 return sp->block_is_obj(addr); | |
2685 } | |
2686 | |
2687 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2688 return true; | |
2689 } | |
2690 | |
2691 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2692 return HeapRegion::GrainBytes; | |
2693 } | |
2694 | |
2695 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2696 // Return the remaining space in the cur alloc region, but not less than | |
2697 // the min TLAB size. | |
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2698 |
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2699 // Also, this value can be at most the humongous object threshold, |
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2700 // since we can't allow tlabs to grow big enough to accomodate |
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2701 // humongous objects. |
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2702 |
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2703 HeapRegion* hr = _mutator_alloc_region.get(); |
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2704 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
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2705 if (hr == NULL) { |
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2706 return max_tlab_size; |
342 | 2707 } else { |
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2708 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2709 } |
2710 } | |
2711 | |
2712 size_t G1CollectedHeap::max_capacity() const { | |
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2713 return _g1_reserved.byte_size(); |
342 | 2714 } |
2715 | |
2716 jlong G1CollectedHeap::millis_since_last_gc() { | |
2717 // assert(false, "NYI"); | |
2718 return 0; | |
2719 } | |
2720 | |
2721 void G1CollectedHeap::prepare_for_verify() { | |
2722 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2723 ensure_parsability(false); | |
2724 } | |
2725 g1_rem_set()->prepare_for_verify(); | |
2726 } | |
2727 | |
2728 class VerifyLivenessOopClosure: public OopClosure { | |
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2729 G1CollectedHeap* _g1h; |
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2730 VerifyOption _vo; |
342 | 2731 public: |
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2732 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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2733 _g1h(g1h), _vo(vo) |
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2734 { } |
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2735 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2736 void do_oop( oop *p) { do_oop_work(p); } |
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2737 |
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2738 template <class T> void do_oop_work(T *p) { |
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2739 oop obj = oopDesc::load_decode_heap_oop(p); |
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2740 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
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2741 "Dead object referenced by a not dead object"); |
342 | 2742 } |
2743 }; | |
2744 | |
2745 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2746 private: |
342 | 2747 G1CollectedHeap* _g1h; |
2748 size_t _live_bytes; | |
2749 HeapRegion *_hr; | |
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2750 VerifyOption _vo; |
342 | 2751 public: |
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2752 // _vo == UsePrevMarking -> use "prev" marking information, |
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2753 // _vo == UseNextMarking -> use "next" marking information, |
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2754 // _vo == UseMarkWord -> use mark word from object header. |
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2755 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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2756 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2757 _g1h = G1CollectedHeap::heap(); |
2758 } | |
2759 void do_object(oop o) { | |
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2760 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2761 assert(o != NULL, "Huh?"); |
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2762 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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2763 // If the object is alive according to the mark word, |
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2764 // then verify that the marking information agrees. |
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2765 // Note we can't verify the contra-positive of the |
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2766 // above: if the object is dead (according to the mark |
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2767 // word), it may not be marked, or may have been marked |
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2768 // but has since became dead, or may have been allocated |
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2769 // since the last marking. |
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2770 if (_vo == VerifyOption_G1UseMarkWord) { |
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2771 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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2772 } |
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2773 |
342 | 2774 o->oop_iterate(&isLive); |
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2775 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2776 size_t obj_size = o->size(); // Make sure we don't overflow |
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2777 _live_bytes += (obj_size * HeapWordSize); |
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2778 } |
342 | 2779 } |
2780 } | |
2781 size_t live_bytes() { return _live_bytes; } | |
2782 }; | |
2783 | |
2784 class PrintObjsInRegionClosure : public ObjectClosure { | |
2785 HeapRegion *_hr; | |
2786 G1CollectedHeap *_g1; | |
2787 public: | |
2788 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2789 _g1 = G1CollectedHeap::heap(); | |
2790 }; | |
2791 | |
2792 void do_object(oop o) { | |
2793 if (o != NULL) { | |
2794 HeapWord *start = (HeapWord *) o; | |
2795 size_t word_sz = o->size(); | |
2796 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2797 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2798 (void*) o, word_sz, | |
2799 _g1->isMarkedPrev(o), | |
2800 _g1->isMarkedNext(o), | |
2801 _hr->obj_allocated_since_prev_marking(o)); | |
2802 HeapWord *end = start + word_sz; | |
2803 HeapWord *cur; | |
2804 int *val; | |
2805 for (cur = start; cur < end; cur++) { | |
2806 val = (int *) cur; | |
2807 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2808 } | |
2809 } | |
2810 } | |
2811 }; | |
2812 | |
2813 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2814 private: |
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2815 bool _allow_dirty; |
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2816 bool _par; |
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2817 VerifyOption _vo; |
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2818 bool _failures; |
811 | 2819 public: |
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2820 // _vo == UsePrevMarking -> use "prev" marking information, |
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2821 // _vo == UseNextMarking -> use "next" marking information, |
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2822 // _vo == UseMarkWord -> use mark word from object header. |
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2823 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
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2824 : _allow_dirty(allow_dirty), |
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2825 _par(par), |
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2826 _vo(vo), |
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2827 _failures(false) {} |
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|
2828 |
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2829 bool failures() { |
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|
2830 return _failures; |
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|
2831 } |
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2832 |
342 | 2833 bool doHeapRegion(HeapRegion* r) { |
390 | 2834 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2835 "Should be unclaimed at verify points."); | |
637
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|
2836 if (!r->continuesHumongous()) { |
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|
2837 bool failures = false; |
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2838 r->verify(_allow_dirty, _vo, &failures); |
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2839 if (failures) { |
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|
2840 _failures = true; |
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|
2841 } else { |
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|
2842 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
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|
2843 r->object_iterate(¬_dead_yet_cl); |
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2844 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
2845 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
2846 "max_live_bytes "SIZE_FORMAT" " |
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|
2847 "< calculated "SIZE_FORMAT, |
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|
2848 r->bottom(), r->end(), |
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|
2849 r->max_live_bytes(), |
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|
2850 not_dead_yet_cl.live_bytes()); |
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|
2851 _failures = true; |
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|
2852 } |
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|
2853 } |
342 | 2854 } |
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|
2855 return false; // stop the region iteration if we hit a failure |
342 | 2856 } |
2857 }; | |
2858 | |
2859 class VerifyRootsClosure: public OopsInGenClosure { | |
2860 private: | |
2861 G1CollectedHeap* _g1h; | |
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|
2862 VerifyOption _vo; |
342 | 2863 bool _failures; |
2864 public: | |
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|
2865 // _vo == UsePrevMarking -> use "prev" marking information, |
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2866 // _vo == UseNextMarking -> use "next" marking information, |
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|
2867 // _vo == UseMarkWord -> use mark word from object header. |
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|
2868 VerifyRootsClosure(VerifyOption vo) : |
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2869 _g1h(G1CollectedHeap::heap()), |
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|
2870 _vo(vo), |
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2871 _failures(false) { } |
342 | 2872 |
2873 bool failures() { return _failures; } | |
2874 | |
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2875 template <class T> void do_oop_nv(T* p) { |
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2876 T heap_oop = oopDesc::load_heap_oop(p); |
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2877 if (!oopDesc::is_null(heap_oop)) { |
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|
2878 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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2879 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 2880 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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|
2881 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
3772
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|
2882 if (_vo == VerifyOption_G1UseMarkWord) { |
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|
2883 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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|
2884 } |
342 | 2885 obj->print_on(gclog_or_tty); |
2886 _failures = true; | |
2887 } | |
2888 } | |
2889 } | |
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|
2890 |
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|
2891 void do_oop(oop* p) { do_oop_nv(p); } |
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|
2892 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2893 }; |
2894 | |
390 | 2895 // This is the task used for parallel heap verification. |
2896 | |
2897 class G1ParVerifyTask: public AbstractGangTask { | |
2898 private: | |
2899 G1CollectedHeap* _g1h; | |
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|
2900 bool _allow_dirty; |
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|
2901 VerifyOption _vo; |
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|
2902 bool _failures; |
390 | 2903 |
2904 public: | |
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2905 // _vo == UsePrevMarking -> use "prev" marking information, |
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2906 // _vo == UseNextMarking -> use "next" marking information, |
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2907 // _vo == UseMarkWord -> use mark word from object header. |
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2908 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 2909 AbstractGangTask("Parallel verify task"), |
845
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2910 _g1h(g1h), |
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2911 _allow_dirty(allow_dirty), |
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|
2912 _vo(vo), |
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2913 _failures(false) { } |
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2914 |
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|
2915 bool failures() { |
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2916 return _failures; |
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|
2917 } |
390 | 2918 |
2919 void work(int worker_i) { | |
637
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2920 HandleMark hm; |
3772
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2921 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
390 | 2922 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2923 HeapRegion::ParVerifyClaimValue); | |
1020
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2924 if (blk.failures()) { |
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2925 _failures = true; |
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2926 } |
390 | 2927 } |
2928 }; | |
2929 | |
342 | 2930 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
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2931 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 2932 } |
2933 | |
2934 void G1CollectedHeap::verify(bool allow_dirty, | |
2935 bool silent, | |
3772
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2936 VerifyOption vo) { |
342 | 2937 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
3293
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2938 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
3772
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2939 VerifyRootsClosure rootsCl(vo); |
989
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2940 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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2941 |
3293
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7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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2942 // We apply the relevant closures to all the oops in the |
1f4413413144
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|
2943 // system dictionary, the string table and the code cache. |
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2944 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
3772
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|
2945 |
3293
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7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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2946 process_strong_roots(true, // activate StrongRootsScope |
1f4413413144
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2947 true, // we set "collecting perm gen" to true, |
1f4413413144
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2948 // so we don't reset the dirty cards in the perm gen. |
1f4413413144
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2949 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 2950 &rootsCl, |
989
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2951 &blobsCl, |
342 | 2952 &rootsCl); |
3772
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2953 |
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2954 // If we're verifying after the marking phase of a Full GC then we can't |
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2955 // treat the perm gen as roots into the G1 heap. Some of the objects in |
6747fd0512e0
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2956 // the perm gen may be dead and hence not marked. If one of these dead |
6747fd0512e0
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2957 // objects is considered to be a root then we may end up with a false |
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2958 // "Root location <x> points to dead ob <y>" failure. |
6747fd0512e0
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|
2959 if (vo != VerifyOption_G1UseMarkWord) { |
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7004681: G1: Extend marking verification to Full GCs
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2960 // Since we used "collecting_perm_gen" == true above, we will not have |
6747fd0512e0
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2961 // checked the refs from perm into the G1-collected heap. We check those |
6747fd0512e0
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2962 // references explicitly below. Whether the relevant cards are dirty |
6747fd0512e0
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|
2963 // is checked further below in the rem set verification. |
6747fd0512e0
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|
2964 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
2965 perm_gen()->oop_iterate(&rootsCl); |
6747fd0512e0
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|
2966 } |
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|
2967 bool failures = rootsCl.failures(); |
3772
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|
2968 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
2969 if (vo != VerifyOption_G1UseMarkWord) { |
6747fd0512e0
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|
2970 // If we're verifying during a full GC then the region sets |
6747fd0512e0
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|
2971 // will have been torn down at the start of the GC. Therefore |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2972 // verifying the region sets will fail. So we only verify |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2973 // the region sets when not in a full GC. |
6747fd0512e0
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diff
changeset
|
2974 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
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|
2975 verify_region_sets(); |
6747fd0512e0
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parents:
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diff
changeset
|
2976 } |
6747fd0512e0
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|
2977 |
2152 | 2978 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 2979 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2980 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2981 "sanity check"); | |
2982 | |
3772
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diff
changeset
|
2983 G1ParVerifyTask task(this, allow_dirty, vo); |
390 | 2984 int n_workers = workers()->total_workers(); |
2985 set_par_threads(n_workers); | |
2986 workers()->run_task(&task); | |
2987 set_par_threads(0); | |
1020
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diff
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|
2988 if (task.failures()) { |
ff2402f6a50b
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|
2989 failures = true; |
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|
2990 } |
390 | 2991 |
2992 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2993 "sanity check"); | |
2994 | |
2995 reset_heap_region_claim_values(); | |
2996 | |
2997 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2998 "sanity check"); | |
2999 } else { | |
3772
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|
3000 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 3001 heap_region_iterate(&blk); |
1020
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|
3002 if (blk.failures()) { |
ff2402f6a50b
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|
3003 failures = true; |
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|
3004 } |
390 | 3005 } |
2152 | 3006 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3007 rem_set()->verify(); |
1020
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|
3008 |
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|
3009 if (failures) { |
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|
3010 gclog_or_tty->print_cr("Heap:"); |
4073
53074c2c4600
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diff
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|
3011 // 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
|
3012 // 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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|
3013 // 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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|
3014 print_extended_on(gclog_or_tty); |
1020
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1019
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|
3015 gclog_or_tty->print_cr(""); |
1547
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jcoomes
parents:
1545
diff
changeset
|
3016 #ifndef PRODUCT |
1044 | 3017 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3018 concurrent_mark()->print_reachable("at-verification-failure", |
3772
6747fd0512e0
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diff
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|
3019 vo, false /* all */); |
1020
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|
3020 } |
1547
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jcoomes
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1545
diff
changeset
|
3021 #endif |
1020
ff2402f6a50b
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1019
diff
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|
3022 gclog_or_tty->flush(); |
ff2402f6a50b
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changeset
|
3023 } |
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diff
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|
3024 guarantee(!failures, "there should not have been any failures"); |
342 | 3025 } else { |
3026 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3027 } | |
3028 } | |
3029 | |
3030 class PrintRegionClosure: public HeapRegionClosure { | |
3031 outputStream* _st; | |
3032 public: | |
3033 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3034 bool doHeapRegion(HeapRegion* r) { | |
3035 r->print_on(_st); | |
3036 return false; | |
3037 } | |
3038 }; | |
3039 | |
3040 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3041 st->print(" %-20s", "garbage-first heap"); |
0316eac49d5a
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811
diff
changeset
|
3042 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
|
3043 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
|
3044 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
0316eac49d5a
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811
diff
changeset
|
3045 _g1_storage.low_boundary(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3046 _g1_storage.high(), |
0316eac49d5a
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diff
changeset
|
3047 _g1_storage.high_boundary()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3048 st->cr(); |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3049 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
838
0316eac49d5a
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diff
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|
3050 size_t young_regions = _young_list->length(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3051 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
0316eac49d5a
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tonyp
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811
diff
changeset
|
3052 young_regions, young_regions * HeapRegion::GrainBytes / K); |
0316eac49d5a
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tonyp
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diff
changeset
|
3053 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
0316eac49d5a
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tonyp
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811
diff
changeset
|
3054 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
0316eac49d5a
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811
diff
changeset
|
3055 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
0316eac49d5a
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tonyp
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diff
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|
3056 st->cr(); |
0316eac49d5a
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changeset
|
3057 perm()->as_gen()->print_on(st); |
4073
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4072
diff
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|
3058 } |
53074c2c4600
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|
3059 |
53074c2c4600
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|
3060 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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4072
diff
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|
3061 print_on(st); |
53074c2c4600
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4072
diff
changeset
|
3062 |
53074c2c4600
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diff
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|
3063 // Print the per-region information. |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
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|
3064 st->cr(); |
53074c2c4600
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|
3065 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 | 3066 PrintRegionClosure blk(st); |
3766 | 3067 heap_region_iterate(&blk); |
342 | 3068 } |
3069 | |
3070 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
|
3071 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3072 workers()->print_worker_threads_on(st); |
3073 } | |
3074 _cmThread->print_on(st); | |
342 | 3075 st->cr(); |
1019 | 3076 _cm->print_worker_threads_on(st); |
3077 _cg1r->print_worker_threads_on(st); | |
342 | 3078 st->cr(); |
3079 } | |
3080 | |
3081 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1833
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jmasa
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1755
diff
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|
3082 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3083 workers()->threads_do(tc); |
3084 } | |
3085 tc->do_thread(_cmThread); | |
794 | 3086 _cg1r->threads_do(tc); |
342 | 3087 } |
3088 | |
3089 void G1CollectedHeap::print_tracing_info() const { | |
3090 // We'll overload this to mean "trace GC pause statistics." | |
3091 if (TraceGen0Time || TraceGen1Time) { | |
3092 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3093 // to that. | |
3094 g1_policy()->print_tracing_info(); | |
3095 } | |
751 | 3096 if (G1SummarizeRSetStats) { |
342 | 3097 g1_rem_set()->print_summary_info(); |
3098 } | |
1282 | 3099 if (G1SummarizeConcMark) { |
342 | 3100 concurrent_mark()->print_summary_info(); |
3101 } | |
3102 g1_policy()->print_yg_surv_rate_info(); | |
3103 SpecializationStats::print(); | |
3104 } | |
3105 | |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
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|
3106 #ifndef PRODUCT |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3107 // Helpful for debugging RSet issues. |
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3774
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|
3108 |
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3109 class PrintRSetsClosure : public HeapRegionClosure { |
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3110 private: |
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3111 const char* _msg; |
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3112 size_t _occupied_sum; |
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3113 |
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3114 public: |
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3115 bool doHeapRegion(HeapRegion* r) { |
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3116 HeapRegionRemSet* hrrs = r->rem_set(); |
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3117 size_t occupied = hrrs->occupied(); |
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3118 _occupied_sum += occupied; |
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3119 |
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3120 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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3121 HR_FORMAT_PARAMS(r)); |
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3122 if (occupied == 0) { |
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3123 gclog_or_tty->print_cr(" RSet is empty"); |
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3124 } else { |
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3125 hrrs->print(); |
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3126 } |
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3127 gclog_or_tty->print_cr("----------"); |
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3128 return false; |
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3129 } |
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3130 |
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3131 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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3132 gclog_or_tty->cr(); |
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3133 gclog_or_tty->print_cr("========================================"); |
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3134 gclog_or_tty->print_cr(msg); |
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3135 gclog_or_tty->cr(); |
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3136 } |
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3137 |
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3138 ~PrintRSetsClosure() { |
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3139 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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3140 gclog_or_tty->print_cr("========================================"); |
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3141 gclog_or_tty->cr(); |
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3142 } |
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3143 }; |
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3144 |
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3145 void G1CollectedHeap::print_cset_rsets() { |
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3146 PrintRSetsClosure cl("Printing CSet RSets"); |
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3147 collection_set_iterate(&cl); |
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3148 } |
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3149 |
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3150 void G1CollectedHeap::print_all_rsets() { |
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3151 PrintRSetsClosure cl("Printing All RSets");; |
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3152 heap_region_iterate(&cl); |
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3153 } |
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3154 #endif // PRODUCT |
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3155 |
342 | 3156 G1CollectedHeap* G1CollectedHeap::heap() { |
3157 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3158 "not a garbage-first heap"); | |
3159 return _g1h; | |
3160 } | |
3161 | |
3162 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3163 // always_do_update_barrier = false; |
342 | 3164 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3165 // Call allocation profiler | |
3166 AllocationProfiler::iterate_since_last_gc(); | |
3167 // Fill TLAB's and such | |
3168 ensure_parsability(true); | |
3169 } | |
3170 | |
3171 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3172 // FIXME: what is this about? | |
3173 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3174 // is set. | |
3175 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3176 "derived pointer present")); | |
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3177 // always_do_update_barrier = true; |
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3178 |
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3179 // We have just completed a GC. Update the soft reference |
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3180 // policy with the new heap occupancy |
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3181 Universe::update_heap_info_at_gc(); |
342 | 3182 } |
3183 | |
1973 | 3184 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3185 unsigned int gc_count_before, | |
3186 bool* succeeded) { | |
3187 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3188 g1_policy()->record_stop_world_start(); |
1973 | 3189 VM_G1IncCollectionPause op(gc_count_before, |
3190 word_size, | |
3191 false, /* should_initiate_conc_mark */ | |
3192 g1_policy()->max_pause_time_ms(), | |
3193 GCCause::_g1_inc_collection_pause); | |
3194 VMThread::execute(&op); | |
3195 | |
3196 HeapWord* result = op.result(); | |
3197 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3198 assert(result == NULL || ret_succeeded, | |
3199 "the result should be NULL if the VM did not succeed"); | |
3200 *succeeded = ret_succeeded; | |
3201 | |
3202 assert_heap_not_locked(); | |
3203 return result; | |
342 | 3204 } |
3205 | |
3206 void | |
3207 G1CollectedHeap::doConcurrentMark() { | |
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3208 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3209 if (!_cmThread->in_progress()) { |
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3210 _cmThread->set_started(); |
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3211 CGC_lock->notify(); |
342 | 3212 } |
3213 } | |
3214 | |
3215 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3216 bool young) { | |
3217 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3218 } | |
3219 | |
3220 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3221 predicted_time_ms) { | |
3222 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3223 } | |
3224 | |
3225 size_t G1CollectedHeap::pending_card_num() { | |
3226 size_t extra_cards = 0; | |
3227 JavaThread *curr = Threads::first(); | |
3228 while (curr != NULL) { | |
3229 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3230 extra_cards += dcq.size(); | |
3231 curr = curr->next(); | |
3232 } | |
3233 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3234 size_t buffer_size = dcqs.buffer_size(); | |
3235 size_t buffer_num = dcqs.completed_buffers_num(); | |
3236 return buffer_size * buffer_num + extra_cards; | |
3237 } | |
3238 | |
3239 size_t G1CollectedHeap::max_pending_card_num() { | |
3240 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3241 size_t buffer_size = dcqs.buffer_size(); | |
3242 size_t buffer_num = dcqs.completed_buffers_num(); | |
3243 int thread_num = Threads::number_of_threads(); | |
3244 return (buffer_num + thread_num) * buffer_size; | |
3245 } | |
3246 | |
3247 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3248 return g1_rem_set()->cardsScanned(); |
342 | 3249 } |
3250 | |
3251 void | |
3252 G1CollectedHeap::setup_surviving_young_words() { | |
3253 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
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3254 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3255 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
3256 if (_surviving_young_words == NULL) { | |
3257 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3258 "Not enough space for young surv words summary."); | |
3259 } | |
3260 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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3261 #ifdef ASSERT |
342 | 3262 for (size_t i = 0; i < array_length; ++i) { |
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3263 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3264 } |
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3265 #endif // !ASSERT |
342 | 3266 } |
3267 | |
3268 void | |
3269 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3270 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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3271 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3272 for (size_t i = 0; i < array_length; ++i) |
3273 _surviving_young_words[i] += surv_young_words[i]; | |
3274 } | |
3275 | |
3276 void | |
3277 G1CollectedHeap::cleanup_surviving_young_words() { | |
3278 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3279 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3280 _surviving_young_words = NULL; | |
3281 } | |
3282 | |
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3283 #ifdef ASSERT |
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3284 class VerifyCSetClosure: public HeapRegionClosure { |
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3285 public: |
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3286 bool doHeapRegion(HeapRegion* hr) { |
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3287 // Here we check that the CSet region's RSet is ready for parallel |
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3288 // iteration. The fields that we'll verify are only manipulated |
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3289 // when the region is part of a CSet and is collected. Afterwards, |
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3290 // we reset these fields when we clear the region's RSet (when the |
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3291 // region is freed) so they are ready when the region is |
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3292 // re-allocated. The only exception to this is if there's an |
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3293 // evacuation failure and instead of freeing the region we leave |
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3294 // it in the heap. In that case, we reset these fields during |
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3295 // evacuation failure handling. |
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3296 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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3297 |
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3298 // Here's a good place to add any other checks we'd like to |
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3299 // perform on CSet regions. |
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3300 return false; |
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|
3301 } |
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3302 }; |
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3303 #endif // ASSERT |
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3304 |
1709 | 3305 #if TASKQUEUE_STATS |
3306 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3307 st->print_raw_cr("GC Task Stats"); | |
3308 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3309 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3310 } | |
3311 | |
3312 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3313 print_taskqueue_stats_hdr(st); | |
3314 | |
3315 TaskQueueStats totals; | |
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3316 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3317 for (int i = 0; i < n; ++i) { |
3318 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3319 totals += task_queue(i)->stats; | |
3320 } | |
3321 st->print_raw("tot "); totals.print(st); st->cr(); | |
3322 | |
3323 DEBUG_ONLY(totals.verify()); | |
3324 } | |
3325 | |
3326 void G1CollectedHeap::reset_taskqueue_stats() { | |
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3327 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3328 for (int i = 0; i < n; ++i) { |
3329 task_queue(i)->stats.reset(); | |
3330 } | |
3331 } | |
3332 #endif // TASKQUEUE_STATS | |
3333 | |
1973 | 3334 bool |
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3335 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3336 assert_at_safepoint(true /* should_be_vm_thread */); |
3337 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3338 | |
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3339 if (GC_locker::check_active_before_gc()) { |
1973 | 3340 return false; |
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3341 } |
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3342 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3343 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3344 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3345 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3346 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3347 Universe::print_heap_before_gc(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3348 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3349 |
4072 | 3350 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3351 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3352 verify_dirty_young_regions(); |
2152 | 3353 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3354 { |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3355 // This call will decide whether this pause is an initial-mark |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3356 // pause. If it is, during_initial_mark_pause() will return true |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3357 // for the duration of this pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3358 g1_policy()->decide_on_conc_mark_initiation(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3359 |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3360 // We do not allow initial-mark to be piggy-backed on a |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3361 // partially-young GC. |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3362 assert(!g1_policy()->during_initial_mark_pause() || |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3363 g1_policy()->full_young_gcs(), "sanity"); |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3364 |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3365 // We also do not allow partially-young GCs during marking. |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3366 assert(!mark_in_progress() || g1_policy()->full_young_gcs(), "sanity"); |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
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|
3367 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3368 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3369 sprintf(verbose_str, "GC pause "); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3370 if (g1_policy()->full_young_gcs()) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3371 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3372 } else { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3373 strcat(verbose_str, "(partial)"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3374 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3375 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3376 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3377 // 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
|
3378 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3379 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3380 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3381 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3382 // 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
|
3383 // 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
|
3384 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3385 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3386 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3387 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
|
3388 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3389 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3390 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3391 |
2361 | 3392 // If the secondary_free_list is not empty, append it to the |
3393 // free_list. No need to wait for the cleanup operation to finish; | |
3394 // the region allocation code will check the secondary_free_list | |
3395 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3396 // set, skip this step so that the region allocation code has to | |
3397 // get entries from the secondary_free_list. | |
2152 | 3398 if (!G1StressConcRegionFreeing) { |
2361 | 3399 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3400 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3401 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3402 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3403 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3404 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3405 { // 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
|
3406 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3407 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3408 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3409 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
|
3410 increment_gc_time_stamp(); |
342 | 3411 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3412 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3413 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
|
3414 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3415 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3416 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3417 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3418 /* option */ VerifyOption_G1UsePrevMarking); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3419 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3420 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3421 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3422 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3423 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3424 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3425 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3426 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3427 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3428 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3429 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3430 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3431 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3432 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3433 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3434 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3435 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3436 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3437 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3438 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3439 // 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
|
3440 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3441 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3442 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3443 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3444 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3445 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3446 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3447 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3448 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3449 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3450 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3451 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3452 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3453 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3454 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3455 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3456 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
|
3457 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3458 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3459 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3460 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3461 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3462 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3463 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3464 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3465 #endif // YOUNG_LIST_VERBOSE |
342 | 3466 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3467 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3468 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3469 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3470 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3471 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3472 // We must do this before any possible evacuation that should propagate |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3473 // marks. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3474 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3475 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3476 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3477 _cm->drainAllSATBBuffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3478 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3479 g1_policy()->record_satb_drain_time(finish_mark_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3480 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3481 // Record the number of elements currently on the mark stack, so we |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3482 // only iterate over these. (Since evacuation may add to the mark |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3483 // stack, doing more exposes race conditions.) If no mark is in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3484 // progress, this will be zero. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3485 _cm->set_oops_do_bound(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3486 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3487 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3488 concurrent_mark()->newCSet(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3489 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3490 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3491 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3492 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3493 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3494 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
|
3495 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3496 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3497 g1_policy()->choose_collection_set(target_pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3498 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3499 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3500 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3501 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3502 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3503 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3504 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3505 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3506 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3507 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3508 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3509 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3510 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3511 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3512 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3513 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3514 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3515 // We have chosen the complete collection set. If marking is |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3516 // active then, we clear the region fields of any of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3517 // concurrent marking tasks whose region fields point into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3518 // the collection set as these values will become stale. This |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3519 // will cause the owning marking threads to claim a new region |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3520 // when marking restarts. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3521 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3522 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3523 } |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3524 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3525 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3526 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3527 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3528 #endif // ASSERT |
1707 | 3529 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3530 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3531 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3532 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3533 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3534 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3535 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3536 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3537 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3538 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3539 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3540 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3541 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3542 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3543 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3544 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3545 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3546 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3547 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3548 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3549 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3550 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3551 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3552 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3553 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3554 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3555 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3556 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3557 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3558 "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
|
3559 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3560 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3561 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3562 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3563 #endif // YOUNG_LIST_VERBOSE |
342 | 3564 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3565 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3566 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3567 _young_list->last_survivor_region()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3568 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3569 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3570 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3571 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3572 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3573 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3574 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3575 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3576 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3577 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3578 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3579 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3580 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3581 set_marking_started(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3582 // CAUTION: after the doConcurrentMark() call below, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3583 // the concurrent marking thread(s) could be running |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3584 // concurrently with us. Make sure that anything after |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3585 // this point does not assume that we are the only GC thread |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3586 // running. Note: of course, the actual marking work will |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3587 // not start until the safepoint itself is released in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3588 // ConcurrentGCThread::safepoint_desynchronize(). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3589 doConcurrentMark(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3590 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3591 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3592 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3593 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3594 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3595 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3596 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3597 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
|
3598 #endif // YOUNG_LIST_VERBOSE |
342 | 3599 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3600 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3601 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3602 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3603 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3604 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3605 size_t bytes_before = capacity(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3606 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3607 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3608 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3612 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3613 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 g1_policy()->record_pause_time_ms(pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 g1_policy()->record_collection_pause_end(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3620 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3621 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 // 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
|
3623 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 // 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
|
3626 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 // 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
|
3634 // 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
|
3635 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 // 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
|
3637 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 prepare_for_verify(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 Universe::verify(/* allow dirty */ true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 /* silent */ false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 /* option */ VerifyOption_G1UsePrevMarking); |
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 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 // 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
|
3658 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3659 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3660 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3661 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3662 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3663 size_t bytes_before = capacity(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3664 // No need for an ergo verbose message here, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3665 // expansion_amount() does this when it returns a value > 0. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3666 if (!expand(expand_bytes)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3667 // We failed to expand the heap so let's verify that |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3668 // committed/uncommitted amount match the backing store |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3669 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3670 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3671 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3672 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3673 } |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3674 |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3675 // 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
|
3676 // 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
|
3677 // 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
|
3678 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3679 _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
|
3680 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3681 // 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
|
3682 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3683 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3684 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3685 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3686 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3687 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3688 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3689 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3690 #endif |
342 | 3691 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3692 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3693 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3694 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3695 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3696 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
|
3697 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3698 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3699 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3700 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3701 |
3766 | 3702 _hrs.verify_optional(); |
2152 | 3703 verify_region_sets_optional(); |
3704 | |
1709 | 3705 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3706 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3707 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3708 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3709 Universe::print_heap_after_gc(); |
342 | 3710 } |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3711 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3712 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3713 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3714 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3715 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3716 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3717 } |
1973 | 3718 |
3719 return true; | |
342 | 3720 } |
3721 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3722 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3723 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3724 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3725 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3726 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3727 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3728 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3729 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3730 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3731 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3732 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3733 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3734 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3735 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3736 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3737 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3738 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3739 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3740 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3741 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3742 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3743 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3744 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3745 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3746 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3747 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3748 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3749 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3750 void G1CollectedHeap::init_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3751 assert_at_safepoint(true /* should_be_vm_thread */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3752 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
3753 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3754 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3755 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3756 _retained_old_gc_alloc_region = NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3757 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
3758 // We will discard the current GC alloc region if: |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3759 // a) it's in the collection set (it can happen!), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3760 // b) it's already full (no point in using it), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3761 // c) it's empty (this means that it was emptied during |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3762 // a cleanup and it should be on the free list now), or |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3763 // d) it's humongous (this means that it was emptied |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3764 // during a cleanup and was added to the free list, but |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3765 // has been subseqently used to allocate a humongous |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3766 // object that may be less than the region size). |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3767 if (retained_region != NULL && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3768 !retained_region->in_collection_set() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3769 !(retained_region->top() == retained_region->end()) && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3770 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3771 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3772 retained_region->set_saved_mark(); |
4072 | 3773 // The retained region was added to the old region set when it was |
3774 // retired. We have to remove it now, since we don't allow regions | |
3775 // we allocate to in the region sets. We'll re-add it later, when | |
3776 // it's retired again. | |
3777 _old_set.remove(retained_region); | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
3778 _old_gc_alloc_region.set(retained_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
3779 _hr_printer.reuse(retained_region); |
342 | 3780 } |
3781 } | |
3782 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3783 void G1CollectedHeap::release_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
3784 _survivor_gc_alloc_region.release(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
3785 // If we have an old GC alloc region to release, we'll save it in |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3786 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
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|
3787 // _retained_old_gc_alloc_region will become NULL. This is what we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3788 // want either way so no reason to check explicitly for either |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3789 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3790 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 3791 } |
3792 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3793 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3794 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3795 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3796 _retained_old_gc_alloc_region = NULL; |
342 | 3797 } |
3798 | |
3799 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3800 _drain_in_progress = false; | |
3801 set_evac_failure_closure(cl); | |
3802 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3803 } | |
3804 | |
3805 void G1CollectedHeap::finalize_for_evac_failure() { | |
3806 assert(_evac_failure_scan_stack != NULL && | |
3807 _evac_failure_scan_stack->length() == 0, | |
3808 "Postcondition"); | |
3809 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3810 delete _evac_failure_scan_stack; |
342 | 3811 _evac_failure_scan_stack = NULL; |
3812 } | |
3813 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3814 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3815 private: |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3816 G1CollectedHeap* _g1; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3817 DirtyCardQueue *_dcq; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3818 CardTableModRefBS* _ct_bs; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3819 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3820 public: |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3821 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3822 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3823 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3824 virtual 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
|
3825 virtual 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
|
3826 template <class T> void do_oop_work(T* p) { |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3827 assert(_from->is_in_reserved(p), "paranoia"); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3828 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3829 !_from->is_survivor()) { |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3830 size_t card_index = _ct_bs->index_for(p); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3831 if (_ct_bs->mark_card_deferred(card_index)) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3832 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3833 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3834 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3835 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3836 }; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3837 |
342 | 3838 class RemoveSelfPointerClosure: public ObjectClosure { |
3839 private: | |
3840 G1CollectedHeap* _g1; | |
3841 ConcurrentMark* _cm; | |
3842 HeapRegion* _hr; | |
3843 size_t _prev_marked_bytes; | |
3844 size_t _next_marked_bytes; | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3845 OopsInHeapRegionClosure *_cl; |
342 | 3846 public: |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3847 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3848 OopsInHeapRegionClosure* cl) : |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3849 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3850 _next_marked_bytes(0), _cl(cl) {} |
342 | 3851 |
3852 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3853 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3854 | |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3855 // <original comment> |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3856 // The original idea here was to coalesce evacuated and dead objects. |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3857 // However that caused complications with the block offset table (BOT). |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3858 // In particular if there were two TLABs, one of them partially refined. |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3859 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3860 // The BOT entries of the unrefined part of TLAB_2 point to the start |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3861 // of TLAB_2. If the last object of the TLAB_1 and the first object |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3862 // of TLAB_2 are coalesced, then the cards of the unrefined part |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3863 // would point into middle of the filler object. |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3864 // The current approach is to not coalesce and leave the BOT contents intact. |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3865 // </original comment> |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3866 // |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3867 // We now reset the BOT when we start the object iteration over the |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3868 // region and refine its entries for every object we come across. So |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3869 // the above comment is not really relevant and we should be able |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3870 // to coalesce dead objects if we want to. |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3871 void do_object(oop obj) { |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3872 HeapWord* obj_addr = (HeapWord*) obj; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3873 assert(_hr->is_in(obj_addr), "sanity"); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3874 size_t obj_size = obj->size(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3875 _hr->update_bot_for_object(obj_addr, obj_size); |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3876 if (obj->is_forwarded() && obj->forwardee() == obj) { |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3877 // The object failed to move. |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3878 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3879 _cm->markPrev(obj); |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
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|
3880 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
2133
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|
3881 _prev_marked_bytes += (obj_size * HeapWordSize); |
352
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diff
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|
3882 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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diff
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|
3883 _cm->markAndGrayObjectIfNecessary(obj); |
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|
3884 } |
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6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
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|
3885 obj->set_mark(markOopDesc::prototype()); |
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|
3886 // While we were processing RSet buffers during the |
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diff
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|
3887 // collection, we actually didn't scan any cards on the |
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diff
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|
3888 // collection set, since we didn't want to update remebered |
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diff
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|
3889 // sets with entries that point into the collection set, given |
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diff
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|
3890 // that live objects fromthe collection set are about to move |
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diff
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|
3891 // and such entries will be stale very soon. This change also |
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diff
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|
3892 // dealt with a reliability issue which involved scanning a |
e0c09f7ec5c4
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iveresov
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diff
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|
3893 // card in the collection set and coming across an array that |
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iveresov
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diff
changeset
|
3894 // was being chunked and looking malformed. The problem is |
e0c09f7ec5c4
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|
3895 // that, if evacuation fails, we might have remembered set |
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diff
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|
3896 // entries missing given that we skipped cards on the |
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iveresov
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diff
changeset
|
3897 // collection set. So, we'll recreate such entries now. |
616
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|
3898 obj->oop_iterate(_cl); |
352
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|
3899 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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|
3900 } else { |
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iveresov
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|
3901 // The object has been either evacuated or is dead. Fill it with a |
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|
3902 // dummy object. |
2133
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|
3903 MemRegion mr((HeapWord*)obj, obj_size); |
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
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|
3904 CollectedHeap::fill_with_object(mr); |
342 | 3905 _cm->clearRangeBothMaps(mr); |
3906 } | |
3907 } | |
3908 }; | |
3909 | |
3910 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 3911 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3912 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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3913 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3914 OopsInHeapRegionClosure *cl; |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3915 if (G1DeferredRSUpdate) { |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3916 cl = &deferred_update; |
4f360ec815ba
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|
3917 } else { |
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|
3918 cl = &immediate_update; |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3919 } |
342 | 3920 HeapRegion* cur = g1_policy()->collection_set(); |
3921 while (cur != NULL) { | |
3922 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
2133
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|
3923 assert(!cur->isHumongous(), "sanity"); |
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|
3924 |
342 | 3925 if (cur->evacuation_failed()) { |
3926 assert(cur->in_collection_set(), "bad CS"); | |
2133
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|
3927 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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|
3928 |
3777
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7046182: G1: remove unnecessary iterations over the collection set
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|
3929 // In the common case we make sure that this is done when the |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
changeset
|
3930 // region is freed so that it is "ready-to-go" when it's |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
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|
3931 // re-allocated. However, when evacuation failure happens, a |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
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|
3932 // region will remain in the heap and might ultimately be added |
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7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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changeset
|
3933 // to a CSet in the future. So we have to be careful here and |
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7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3934 // make sure the region's RSet is ready for parallel iteration |
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7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
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|
3935 // whenever this might be required in the future. |
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|
3936 cur->rem_set()->reset_for_par_iteration(); |
2133
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|
3937 cur->reset_bot(); |
616
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|
3938 cl->set_region(cur); |
342 | 3939 cur->object_iterate(&rspc); |
3940 | |
3941 // A number of manipulations to make the TAMS be the current top, | |
3942 // and the marked bytes be the ones observed in the iteration. | |
3943 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3944 // The comments below are the postconditions achieved by the | |
3945 // calls. Note especially the last such condition, which says that | |
3946 // the count of marked bytes has been properly restored. | |
3947 cur->note_start_of_marking(false); | |
3948 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3949 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
3950 // _next_marked_bytes == prev_marked_bytes. | |
3951 cur->note_end_of_marking(); | |
3952 // _prev_top_at_mark_start == top(), | |
3953 // _prev_marked_bytes == prev_marked_bytes | |
3954 } | |
3955 // If there is no mark in progress, we modified the _next variables | |
3956 // above needlessly, but harmlessly. | |
3957 if (_g1h->mark_in_progress()) { | |
3958 cur->note_start_of_marking(false); | |
3959 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3960 // _next_marked_bytes == next_marked_bytes. | |
3961 } | |
3962 } | |
3963 cur = cur->next_in_collection_set(); | |
3964 } | |
3965 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3966 | |
3967 // Now restore saved marks, if any. | |
3968 if (_objs_with_preserved_marks != NULL) { | |
3969 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
3970 guarantee(_objs_with_preserved_marks->length() == | |
3971 _preserved_marks_of_objs->length(), "Both or none."); | |
3972 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
3973 oop obj = _objs_with_preserved_marks->at(i); | |
3974 markOop m = _preserved_marks_of_objs->at(i); | |
3975 obj->set_mark(m); | |
3976 } | |
3977 // Delete the preserved marks growable arrays (allocated on the C heap). | |
3978 delete _objs_with_preserved_marks; | |
3979 delete _preserved_marks_of_objs; | |
3980 _objs_with_preserved_marks = NULL; | |
3981 _preserved_marks_of_objs = NULL; | |
3982 } | |
3983 } | |
3984 | |
3985 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
3986 _evac_failure_scan_stack->push(obj); | |
3987 } | |
3988 | |
3989 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
3990 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
3991 | |
3992 while (_evac_failure_scan_stack->length() > 0) { | |
3993 oop obj = _evac_failure_scan_stack->pop(); | |
3994 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
3995 obj->oop_iterate_backwards(_evac_failure_closure); | |
3996 } | |
3997 } | |
3998 | |
3999 oop | |
4000 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3973
663cb89032b1
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3920
diff
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|
4001 oop old, |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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3920
diff
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|
4002 bool should_mark_root) { |
3323
75af3e8de182
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diff
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|
4003 assert(obj_in_cs(old), |
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diff
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|
4004 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
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|
4005 (HeapWord*) old)); |
342 | 4006 markOop m = old->mark(); |
4007 oop forward_ptr = old->forward_to_atomic(old); | |
4008 if (forward_ptr == NULL) { | |
4009 // 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
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|
4010 |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
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|
4011 // should_mark_root will be true when this routine is called |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
3920
diff
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|
4012 // from a root scanning closure during an initial mark pause. |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
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|
4013 // In this case the thread that succeeds in self-forwarding the |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
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3920
diff
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|
4014 // object is also responsible for marking the object. |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
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diff
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|
4015 if (should_mark_root) { |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
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diff
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|
4016 assert(!oopDesc::is_null(old), "shouldn't be"); |
663cb89032b1
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diff
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|
4017 _cm->grayRoot(old); |
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johnc
parents:
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diff
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|
4018 } |
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|
4019 |
342 | 4020 if (_evac_failure_closure != cl) { |
4021 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4022 assert(!_drain_in_progress, | |
4023 "Should only be true while someone holds the lock."); | |
4024 // Set the global evac-failure closure to the current thread's. | |
4025 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4026 set_evac_failure_closure(cl); | |
4027 // Now do the common part. | |
4028 handle_evacuation_failure_common(old, m); | |
4029 // Reset to NULL. | |
4030 set_evac_failure_closure(NULL); | |
4031 } else { | |
4032 // The lock is already held, and this is recursive. | |
4033 assert(_drain_in_progress, "This should only be the recursive case."); | |
4034 handle_evacuation_failure_common(old, m); | |
4035 } | |
4036 return old; | |
4037 } else { | |
3323
75af3e8de182
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|
4038 // Forward-to-self failed. Either someone else managed to allocate |
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diff
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|
4039 // space for this object (old != forward_ptr) or they beat us in |
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diff
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|
4040 // self-forwarding it (old == forward_ptr). |
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diff
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|
4041 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
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diff
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|
4042 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
75af3e8de182
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diff
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|
4043 "should not be in the CSet", |
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diff
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|
4044 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4045 return forward_ptr; |
4046 } | |
4047 } | |
4048 | |
4049 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4050 set_evacuation_failed(true); | |
4051 | |
4052 preserve_mark_if_necessary(old, m); | |
4053 | |
4054 HeapRegion* r = heap_region_containing(old); | |
4055 if (!r->evacuation_failed()) { | |
4056 r->set_evacuation_failed(true); | |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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3777
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|
4057 _hr_printer.evac_failure(r); |
342 | 4058 } |
4059 | |
4060 push_on_evac_failure_scan_stack(old); | |
4061 | |
4062 if (!_drain_in_progress) { | |
4063 // prevent recursion in copy_to_survivor_space() | |
4064 _drain_in_progress = true; | |
4065 drain_evac_failure_scan_stack(); | |
4066 _drain_in_progress = false; | |
4067 } | |
4068 } | |
4069 | |
4070 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
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parents:
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diff
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|
4071 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4072 // 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
|
4073 // case of a promotion failure. |
74ee0db180fa
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parents:
2037
diff
changeset
|
4074 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4075 if (_objs_with_preserved_marks == NULL) { |
4076 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4077 _objs_with_preserved_marks = | |
4078 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4079 _preserved_marks_of_objs = | |
4080 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4081 } | |
4082 _objs_with_preserved_marks->push(obj); | |
4083 _preserved_marks_of_objs->push(m); | |
4084 } | |
4085 } | |
4086 | |
4087 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4088 size_t word_size) { | |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
4089 if (purpose == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
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|
4090 HeapWord* result = survivor_attempt_allocation(word_size); |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4091 if (result != NULL) { |
f44782f04dd4
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tonyp
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diff
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|
4092 return result; |
342 | 4093 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4094 // 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
|
4095 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4096 return old_attempt_allocation(word_size); |
342 | 4097 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4098 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4099 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4100 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
|
4101 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4102 return result; |
342 | 4103 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4104 // 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
|
4105 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4106 return survivor_attempt_allocation(word_size); |
342 | 4107 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4108 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4109 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4110 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4111 // Trying to keep some compilers happy. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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changeset
|
4112 return NULL; |
342 | 4113 } |
4114 | |
4115 #ifndef PRODUCT | |
4116 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4117 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4118 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4119 return true; | |
4120 } | |
4121 #endif // PRODUCT | |
4122 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
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changeset
|
4123 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
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changeset
|
4124 ParGCAllocBuffer(gclab_word_size), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4125 _should_mark_objects(false), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
4126 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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changeset
|
4127 _retired(false) |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4128 { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4129 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4130 // mark the forwarded location of an evacuated object. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4131 // We set _should_mark_objects to true if marking is active, i.e. when we |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4132 // need to propagate a mark, or during an initial mark pause, i.e. when we |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4133 // need to mark objects immediately reachable by the roots. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4134 if (G1CollectedHeap::heap()->mark_in_progress() || |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4135 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4136 _should_mark_objects = true; |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4137 } |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4138 } |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4139 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4140 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
4141 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4142 _refs(g1h->task_queue(queue_num)), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4143 _dcq(&g1h->dirty_card_queue_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4144 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4145 _g1_rem(g1h->g1_rem_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4146 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4147 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4148 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
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diff
changeset
|
4149 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4150 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4151 _strong_roots_time(0), _term_time(0), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4152 _alloc_buffer_waste(0), _undo_waste(0) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4153 { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4154 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4155 // 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
|
4156 // non-young regions (where the age is -1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4157 // 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
|
4158 // 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
|
4159 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:
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diff
changeset
|
4160 size_t array_length = PADDING_ELEM_NUM + |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4161 real_length + |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4162 PADDING_ELEM_NUM; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4163 _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:
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diff
changeset
|
4164 if (_surviving_young_words_base == NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4165 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
|
4166 "Not enough space for young surv histo."); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4167 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4168 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4169 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4170 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4171 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4172 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4173 _start = os::elapsedTime(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
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|
4174 } |
342 | 4175 |
1709 | 4176 void |
4177 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4178 { | |
4179 st->print_raw_cr("GC Termination Stats"); | |
4180 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4181 " ------waste (KiB)------"); | |
4182 st->print_raw_cr("thr ms ms % ms % attempts" | |
4183 " total alloc undo"); | |
4184 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4185 " ------- ------- -------"); | |
4186 } | |
4187 | |
4188 void | |
4189 G1ParScanThreadState::print_termination_stats(int i, | |
4190 outputStream* const st) const | |
4191 { | |
4192 const double elapsed_ms = elapsed_time() * 1000.0; | |
4193 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4194 const double term_ms = term_time() * 1000.0; | |
4195 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4196 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4197 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4198 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4199 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4200 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4201 alloc_buffer_waste() * HeapWordSize / K, | |
4202 undo_waste() * HeapWordSize / K); | |
4203 } | |
4204 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4205 #ifdef ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4206 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4207 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4208 assert(UseCompressedOops, "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4209 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4210 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4211 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4212 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4213 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4214 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4215 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4216 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4217 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4218 if (has_partial_array_mask(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4219 // Must be in the collection set--it's already been copied. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4220 oop p = clear_partial_array_mask(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4221 assert(_g1h->obj_in_cs(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4222 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4223 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4224 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4225 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4226 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4227 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4228 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4229 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4230 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
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|
4231 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4232 if (ref.is_narrow()) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4233 return verify_ref((narrowOop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4234 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4235 return verify_ref((oop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4236 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4237 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4238 #endif // ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4239 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4240 void G1ParScanThreadState::trim_queue() { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4241 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4242 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4243 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4244 |
1862
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4245 StarTask ref; |
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|
4246 do { |
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4247 // Drain the overflow stack first, so other threads can steal. |
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4248 while (refs()->pop_overflow(ref)) { |
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4249 deal_with_reference(ref); |
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4250 } |
3979
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6484982: G1: process references during evacuation pauses
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4251 |
1862
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4252 while (refs()->pop_local(ref)) { |
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4253 deal_with_reference(ref); |
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4254 } |
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4255 } while (!refs()->is_empty()); |
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|
4256 } |
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4257 |
342 | 4258 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4259 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
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4260 _par_scan_state(par_scan_state), |
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4261 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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4262 _mark_in_progress(_g1->mark_in_progress()) { } |
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4263 |
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4264 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
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4265 // This is called from do_oop_work for objects that are not |
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4266 // in the collection set. Objects in the collection set |
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4267 // are marked after they have been evacuated. |
342 | 4268 |
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4269 T heap_oop = oopDesc::load_heap_oop(p); |
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4270 if (!oopDesc::is_null(heap_oop)) { |
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4271 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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4272 HeapWord* addr = (HeapWord*)obj; |
3323
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4273 if (_g1->is_in_g1_reserved(addr)) { |
342 | 4274 _cm->grayRoot(oop(addr)); |
3323
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4275 } |
342 | 4276 } |
4277 } | |
4278 | |
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4279 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
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4280 bool should_mark_copy) { |
342 | 4281 size_t word_sz = old->size(); |
4282 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4283 // +1 to make the -1 indexes valid... | |
4284 int young_index = from_region->young_index_in_cset()+1; | |
4285 assert( (from_region->is_young() && young_index > 0) || | |
4286 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4287 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4288 markOop m = old->mark(); | |
545 | 4289 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4290 : m->age(); | |
4291 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4292 word_sz); |
4293 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4294 oop obj = oop(obj_ptr); | |
4295 | |
4296 if (obj_ptr == NULL) { | |
4297 // This will either forward-to-self, or detect that someone else has | |
4298 // installed a forwarding pointer. | |
4299 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
3973
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4300 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
342 | 4301 } |
4302 | |
526 | 4303 // We're going to allocate linearly, so might as well prefetch ahead. |
4304 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4305 | |
342 | 4306 oop forward_ptr = old->forward_to_atomic(obj); |
4307 if (forward_ptr == NULL) { | |
4308 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4309 if (g1p->track_object_age(alloc_purpose)) { |
4310 // We could simply do obj->incr_age(). However, this causes a | |
4311 // performance issue. obj->incr_age() will first check whether | |
4312 // the object has a displaced mark by checking its mark word; | |
4313 // getting the mark word from the new location of the object | |
4314 // stalls. So, given that we already have the mark word and we | |
4315 // are about to install it anyway, it's better to increase the | |
4316 // age on the mark word, when the object does not have a | |
4317 // displaced mark word. We're not expecting many objects to have | |
4318 // a displaced marked word, so that case is not optimized | |
4319 // further (it could be...) and we simply call obj->incr_age(). | |
4320 | |
4321 if (m->has_displaced_mark_helper()) { | |
4322 // in this case, we have to install the mark word first, | |
4323 // otherwise obj looks to be forwarded (the old mark word, | |
4324 // which contains the forward pointer, was copied) | |
4325 obj->set_mark(m); | |
4326 obj->incr_age(); | |
4327 } else { | |
4328 m = m->incr_age(); | |
545 | 4329 obj->set_mark(m); |
526 | 4330 } |
545 | 4331 _par_scan_state->age_table()->add(obj, word_sz); |
4332 } else { | |
4333 obj->set_mark(m); | |
526 | 4334 } |
4335 | |
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4336 // Mark the evacuated object or propagate "next" mark bit |
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4337 if (should_mark_copy) { |
342 | 4338 if (!use_local_bitmaps || |
4339 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4340 // if we couldn't mark it on the local bitmap (this happens when | |
4341 // the object was not allocated in the GCLab), we have to bite | |
4342 // the bullet and do the standard parallel mark | |
4343 _cm->markAndGrayObjectIfNecessary(obj); | |
4344 } | |
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4345 |
342 | 4346 if (_g1->isMarkedNext(old)) { |
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4347 // Unmark the object's old location so that marking |
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4348 // doesn't think the old object is alive. |
342 | 4349 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
4350 } | |
4351 } | |
4352 | |
4353 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4354 surv_young_words[young_index] += word_sz; | |
4355 | |
4356 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4357 arrayOop(old)->set_length(0); | |
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4358 oop* old_p = set_partial_array_mask(old); |
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4359 _par_scan_state->push_on_queue(old_p); |
342 | 4360 } else { |
526 | 4361 // No point in using the slower heap_region_containing() method, |
4362 // given that we know obj is in the heap. | |
4363 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4364 obj->oop_iterate_backwards(_scanner); |
4365 } | |
4366 } else { | |
4367 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4368 obj = forward_ptr; | |
4369 } | |
4370 return obj; | |
4371 } | |
4372 | |
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|
4373 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
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|
4374 template <class T> |
3886
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4375 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
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|
4376 ::do_oop_work(T* p) { |
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|
4377 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4378 assert(barrier != G1BarrierRS || obj != NULL, |
4379 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4380 | |
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|
4381 // Marking: |
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4382 // If the object is in the collection set, then the thread |
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|
4383 // that copies the object should mark, or propagate the |
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|
4384 // mark to, the evacuated object. |
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|
4385 // If the object is not in the collection set then we |
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|
4386 // should call the mark_object() method depending on the |
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|
4387 // value of the template parameter do_mark_object (which will |
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|
4388 // be true for root scanning closures during an initial mark |
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|
4389 // pause). |
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|
4390 // The mark_object() method first checks whether the object |
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|
4391 // is marked and, if not, attempts to mark the object. |
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|
4392 |
526 | 4393 // here the null check is implicit in the cset_fast_test() test |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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1245
diff
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|
4394 if (_g1->in_cset_fast_test(obj)) { |
526 | 4395 if (obj->is_forwarded()) { |
845
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|
4396 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
3886
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|
4397 // If we are a root scanning closure during an initial |
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|
4398 // mark pause (i.e. do_mark_object will be true) then |
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|
4399 // we also need to handle marking of roots in the |
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|
4400 // event of an evacuation failure. In the event of an |
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|
4401 // evacuation failure, the object is forwarded to itself |
3973
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|
4402 // and not copied. For root-scanning closures, the |
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|
4403 // object would be marked after a successful self-forward |
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|
4404 // but an object could be pointed to by both a root and non |
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|
4405 // root location and be self-forwarded by a non-root-scanning |
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|
4406 // closure. Therefore we also have to attempt to mark the |
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|
4407 // self-forwarded root object here. |
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|
4408 if (do_mark_object && obj->forwardee() == obj) { |
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|
4409 mark_object(p); |
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|
4410 } |
526 | 4411 } else { |
3973
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|
4412 // During an initial mark pause, objects that are pointed to |
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|
4413 // by the roots need to be marked - even in the event of an |
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|
4414 // evacuation failure. We pass the template parameter |
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|
4415 // do_mark_object (which is true for root scanning closures |
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4416 // during an initial mark pause) to copy_to_survivor_space |
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4417 // which will pass it on to the evacuation failure handling |
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4418 // code. The thread that successfully self-forwards a root |
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4419 // object to itself is responsible for marking the object. |
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|
4420 bool should_mark_root = do_mark_object; |
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|
4421 |
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4422 // We need to mark the copied object if we're a root scanning |
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4423 // closure during an initial mark pause (i.e. do_mark_object |
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|
4424 // will be true), or the object is already marked and we need |
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|
4425 // to propagate the mark to the evacuated copy. |
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|
4426 bool should_mark_copy = do_mark_object || |
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|
4427 _during_initial_mark || |
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|
4428 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
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|
4429 |
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|
4430 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
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|
4431 should_mark_copy); |
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|
4432 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4433 } |
526 | 4434 // When scanning the RS, we only care about objs in CS. |
4435 if (barrier == G1BarrierRS) { | |
616
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|
4436 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4437 } |
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4438 } else { |
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4439 // The object is not in collection set. If we're a root scanning |
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4440 // closure during an initial mark pause (i.e. do_mark_object will |
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4441 // be true) then attempt to mark the object. |
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4442 if (do_mark_object) { |
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4443 mark_object(p); |
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4444 } |
526 | 4445 } |
4446 | |
4447 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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4448 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4449 } |
4450 | |
4451 if (do_gen_barrier && obj != NULL) { | |
4452 par_do_barrier(p); | |
4453 } | |
4454 } | |
4455 | |
1261
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4456 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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4457 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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4458 |
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4459 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4460 assert(has_partial_array_mask(p), "invariant"); |
4461 oop old = clear_partial_array_mask(p); | |
342 | 4462 assert(old->is_objArray(), "must be obj array"); |
4463 assert(old->is_forwarded(), "must be forwarded"); | |
4464 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4465 | |
4466 objArrayOop obj = objArrayOop(old->forwardee()); | |
4467 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4468 // Process ParGCArrayScanChunk elements now | |
4469 // and push the remainder back onto queue | |
4470 int start = arrayOop(old)->length(); | |
4471 int end = obj->length(); | |
4472 int remainder = end - start; | |
4473 assert(start <= end, "just checking"); | |
4474 if (remainder > 2 * ParGCArrayScanChunk) { | |
4475 // Test above combines last partial chunk with a full chunk | |
4476 end = start + ParGCArrayScanChunk; | |
4477 arrayOop(old)->set_length(end); | |
4478 // Push remainder. | |
845
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4479 oop* old_p = set_partial_array_mask(old); |
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4480 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4481 _par_scan_state->push_on_queue(old_p); |
342 | 4482 } else { |
4483 // Restore length so that the heap remains parsable in | |
4484 // case of evacuation failure. | |
4485 arrayOop(old)->set_length(end); | |
4486 } | |
845
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4487 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4488 // process our set of indices (include header in first chunk) |
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4489 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4490 } |
4491 | |
4492 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4493 protected: | |
4494 G1CollectedHeap* _g1h; | |
4495 G1ParScanThreadState* _par_scan_state; | |
4496 RefToScanQueueSet* _queues; | |
4497 ParallelTaskTerminator* _terminator; | |
4498 | |
4499 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4500 RefToScanQueueSet* queues() { return _queues; } | |
4501 ParallelTaskTerminator* terminator() { return _terminator; } | |
4502 | |
4503 public: | |
4504 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4505 G1ParScanThreadState* par_scan_state, | |
4506 RefToScanQueueSet* queues, | |
4507 ParallelTaskTerminator* terminator) | |
4508 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4509 _queues(queues), _terminator(terminator) {} | |
4510 | |
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4511 void do_void(); |
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4512 |
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4513 private: |
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4514 inline bool offer_termination(); |
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4515 }; |
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4516 |
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4517 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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4518 G1ParScanThreadState* const pss = par_scan_state(); |
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4519 pss->start_term_time(); |
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4520 const bool res = terminator()->offer_termination(); |
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4521 pss->end_term_time(); |
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4522 return res; |
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|
4523 } |
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4524 |
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4525 void G1ParEvacuateFollowersClosure::do_void() { |
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4526 StarTask stolen_task; |
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4527 G1ParScanThreadState* const pss = par_scan_state(); |
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4528 pss->trim_queue(); |
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|
4529 |
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4530 do { |
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4531 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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4532 assert(pss->verify_task(stolen_task), "sanity"); |
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4533 if (stolen_task.is_narrow()) { |
1883
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4534 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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4535 } else { |
1883
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4536 pss->deal_with_reference((oop*) stolen_task); |
1862
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4537 } |
1883
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4538 |
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4539 // We've just processed a reference and we might have made |
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4540 // available new entries on the queues. So we have to make sure |
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4541 // we drain the queues as necessary. |
342 | 4542 pss->trim_queue(); |
4543 } | |
1862
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4544 } while (!offer_termination()); |
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4545 |
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4546 pss->retire_alloc_buffers(); |
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4547 } |
342 | 4548 |
4549 class G1ParTask : public AbstractGangTask { | |
4550 protected: | |
4551 G1CollectedHeap* _g1h; | |
4552 RefToScanQueueSet *_queues; | |
4553 ParallelTaskTerminator _terminator; | |
845
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4554 int _n_workers; |
342 | 4555 |
4556 Mutex _stats_lock; | |
4557 Mutex* stats_lock() { return &_stats_lock; } | |
4558 | |
4559 size_t getNCards() { | |
4560 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4561 / G1BlockOffsetSharedArray::N_bytes; | |
4562 } | |
4563 | |
4564 public: | |
4565 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4566 : AbstractGangTask("G1 collection"), | |
4567 _g1h(g1h), | |
4568 _queues(task_queues), | |
4569 _terminator(workers, _queues), | |
845
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4570 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4571 _n_workers(workers) |
342 | 4572 {} |
4573 | |
4574 RefToScanQueueSet* queues() { return _queues; } | |
4575 | |
4576 RefToScanQueue *work_queue(int i) { | |
4577 return queues()->queue(i); | |
4578 } | |
4579 | |
4580 void work(int i) { | |
845
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4581 if (i >= _n_workers) return; // no work needed this round |
1611 | 4582 |
4583 double start_time_ms = os::elapsedTime() * 1000.0; | |
4584 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4585 | |
342 | 4586 ResourceMark rm; |
4587 HandleMark hm; | |
4588 | |
3979
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4589 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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4590 |
526 | 4591 G1ParScanThreadState pss(_g1h, i); |
3979
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|
4592 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
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4593 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
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|
4594 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
342 | 4595 |
4596 pss.set_evac_closure(&scan_evac_cl); | |
4597 pss.set_evac_failure_closure(&evac_failure_cl); | |
4598 pss.set_partial_scan_closure(&partial_scan_cl); | |
4599 | |
3979
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4600 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
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4601 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
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|
4602 |
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|
4603 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
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|
4604 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
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|
4605 |
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|
4606 OopClosure* scan_root_cl = &only_scan_root_cl; |
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|
4607 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
342 | 4608 |
1359
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4609 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
3979
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4610 // We also need to mark copied objects. |
342 | 4611 scan_root_cl = &scan_mark_root_cl; |
4612 scan_perm_cl = &scan_mark_perm_cl; | |
4613 } | |
4614 | |
3983
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|
4615 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
3979
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4616 |
342 | 4617 pss.start_strong_roots(); |
4618 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4619 SharedHeap::SO_AllClasses, | |
4620 scan_root_cl, | |
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4621 &push_heap_rs_cl, |
342 | 4622 scan_perm_cl, |
4623 i); | |
4624 pss.end_strong_roots(); | |
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4625 |
342 | 4626 { |
4627 double start = os::elapsedTime(); | |
4628 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4629 evac.do_void(); | |
4630 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4631 double term_ms = pss.term_time()*1000.0; | |
4632 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4633 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4634 } |
1282 | 4635 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4636 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4637 | |
4638 // Clean up any par-expanded rem sets. | |
4639 HeapRegionRemSet::par_cleanup(); | |
4640 | |
4641 if (ParallelGCVerbose) { | |
1709 | 4642 MutexLocker x(stats_lock()); |
4643 pss.print_termination_stats(i); | |
342 | 4644 } |
4645 | |
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4646 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4647 double end_time_ms = os::elapsedTime() * 1000.0; |
4648 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4649 } |
4650 }; | |
4651 | |
4652 // *** Common G1 Evacuation Stuff | |
4653 | |
1833
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4654 // This method is run in a GC worker. |
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4655 |
342 | 4656 void |
4657 G1CollectedHeap:: | |
4658 g1_process_strong_roots(bool collecting_perm_gen, | |
4659 SharedHeap::ScanningOption so, | |
4660 OopClosure* scan_non_heap_roots, | |
4661 OopsInHeapRegionClosure* scan_rs, | |
4662 OopsInGenClosure* scan_perm, | |
4663 int worker_i) { | |
3979
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4664 |
342 | 4665 // First scan the strong roots, including the perm gen. |
4666 double ext_roots_start = os::elapsedTime(); | |
4667 double closure_app_time_sec = 0.0; | |
4668 | |
4669 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4670 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4671 buf_scan_perm.set_generation(perm_gen()); | |
4672 | |
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4673 // Walk the code cache w/o buffering, because StarTask cannot handle |
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|
4674 // unaligned oop locations. |
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|
4675 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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|
4676 |
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|
4677 process_strong_roots(false, // no scoping; this is parallel code |
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|
4678 collecting_perm_gen, so, |
342 | 4679 &buf_scan_non_heap_roots, |
989
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|
4680 &eager_scan_code_roots, |
342 | 4681 &buf_scan_perm); |
1394
1316cec51b4d
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|
4682 |
3979
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4683 // Now the CM ref_processor roots. |
3823
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|
4684 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
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4685 // We need to treat the discovered reference lists of the |
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4686 // concurrent mark ref processor as roots and keep entries |
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4687 // (which are added by the marking threads) on them live |
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4688 // until they can be processed at the end of marking. |
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4689 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
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|
4690 } |
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|
4691 |
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4692 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4693 buf_scan_non_heap_roots.done(); |
4694 buf_scan_perm.done(); | |
3823
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4695 |
342 | 4696 double ext_roots_end = os::elapsedTime(); |
3823
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4697 |
342 | 4698 g1_policy()->reset_obj_copy_time(worker_i); |
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4699 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
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4700 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4701 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
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4702 |
342 | 4703 double ext_root_time_ms = |
4704 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
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4705 |
342 | 4706 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4707 | |
4708 // Scan strong roots in mark stack. | |
4709 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4710 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4711 } | |
4712 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4713 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4714 | |
4715 // Now scan the complement of the collection set. | |
4716 if (scan_rs != NULL) { | |
4717 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4718 } | |
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4719 |
342 | 4720 _process_strong_tasks->all_tasks_completed(); |
4721 } | |
4722 | |
4723 void | |
4724 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4725 OopClosure* non_root_closure) { | |
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4726 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4727 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4728 } |
4729 | |
3979
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4730 // Weak Reference Processing support |
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4731 |
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4732 // An always "is_alive" closure that is used to preserve referents. |
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4733 // If the object is non-null then it's alive. Used in the preservation |
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4734 // of referent objects that are pointed to by reference objects |
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|
4735 // discovered by the CM ref processor. |
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|
4736 class G1AlwaysAliveClosure: public BoolObjectClosure { |
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|
4737 G1CollectedHeap* _g1; |
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|
4738 public: |
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4739 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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4740 void do_object(oop p) { assert(false, "Do not call."); } |
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|
4741 bool do_object_b(oop p) { |
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|
4742 if (p != NULL) { |
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|
4743 return true; |
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|
4744 } |
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|
4745 return false; |
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|
4746 } |
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|
4747 }; |
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|
4748 |
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|
4749 bool G1STWIsAliveClosure::do_object_b(oop p) { |
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4750 // An object is reachable if it is outside the collection set, |
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|
4751 // or is inside and copied. |
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|
4752 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
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|
4753 } |
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|
4754 |
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|
4755 // Non Copying Keep Alive closure |
4dfb2df418f2
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changeset
|
4756 class G1KeepAliveClosure: public OopClosure { |
4dfb2df418f2
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|
4757 G1CollectedHeap* _g1; |
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changeset
|
4758 public: |
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changeset
|
4759 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
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|
4760 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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changeset
|
4761 void do_oop( oop* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4762 oop obj = *p; |
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|
4763 |
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|
4764 if (_g1->obj_in_cs(obj)) { |
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|
4765 assert( obj->is_forwarded(), "invariant" ); |
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changeset
|
4766 *p = obj->forwardee(); |
4dfb2df418f2
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diff
changeset
|
4767 } |
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diff
changeset
|
4768 } |
4dfb2df418f2
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changeset
|
4769 }; |
4dfb2df418f2
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diff
changeset
|
4770 |
4dfb2df418f2
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diff
changeset
|
4771 // Copying Keep Alive closure - can be called from both |
4dfb2df418f2
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diff
changeset
|
4772 // serial and parallel code as long as different worker |
4dfb2df418f2
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diff
changeset
|
4773 // threads utilize different G1ParScanThreadState instances |
4dfb2df418f2
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diff
changeset
|
4774 // and different queues. |
4dfb2df418f2
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diff
changeset
|
4775 |
4dfb2df418f2
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diff
changeset
|
4776 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4777 G1CollectedHeap* _g1h; |
4dfb2df418f2
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changeset
|
4778 OopClosure* _copy_non_heap_obj_cl; |
4dfb2df418f2
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|
4779 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
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|
4780 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
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changeset
|
4781 |
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changeset
|
4782 public: |
4dfb2df418f2
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diff
changeset
|
4783 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
4dfb2df418f2
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|
4784 OopClosure* non_heap_obj_cl, |
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changeset
|
4785 OopsInHeapRegionClosure* perm_obj_cl, |
4dfb2df418f2
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diff
changeset
|
4786 G1ParScanThreadState* pss): |
4dfb2df418f2
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diff
changeset
|
4787 _g1h(g1h), |
4dfb2df418f2
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diff
changeset
|
4788 _copy_non_heap_obj_cl(non_heap_obj_cl), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4789 _copy_perm_obj_cl(perm_obj_cl), |
4dfb2df418f2
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diff
changeset
|
4790 _par_scan_state(pss) |
4dfb2df418f2
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diff
changeset
|
4791 {} |
4dfb2df418f2
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diff
changeset
|
4792 |
4dfb2df418f2
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changeset
|
4793 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
4dfb2df418f2
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|
4794 virtual void do_oop( oop* p) { do_oop_work(p); } |
4dfb2df418f2
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|
4795 |
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changeset
|
4796 template <class T> void do_oop_work(T* p) { |
4dfb2df418f2
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|
4797 oop obj = oopDesc::load_decode_heap_oop(p); |
4dfb2df418f2
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|
4798 |
4dfb2df418f2
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changeset
|
4799 if (_g1h->obj_in_cs(obj)) { |
4dfb2df418f2
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diff
changeset
|
4800 // If the referent object has been forwarded (either copied |
4dfb2df418f2
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diff
changeset
|
4801 // to a new location or to itself in the event of an |
4dfb2df418f2
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|
4802 // evacuation failure) then we need to update the reference |
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diff
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|
4803 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
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|
4804 // heap, update the RSet for the referent. |
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diff
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|
4805 // |
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diff
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|
4806 // If the referent has not been forwarded then we have to keep |
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|
4807 // it alive by policy. Therefore we have copy the referent. |
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|
4808 // |
4dfb2df418f2
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|
4809 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
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diff
changeset
|
4810 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
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diff
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|
4811 // phase of reference processing) the object and it's followers |
4dfb2df418f2
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|
4812 // will be copied, the reference field set to point to the |
4dfb2df418f2
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|
4813 // new location, and the RSet updated. Otherwise we need to |
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|
4814 // use the the non-heap or perm closures directly to copy |
4dfb2df418f2
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|
4815 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
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diff
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|
4816 // updating the RSet. |
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diff
changeset
|
4817 |
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diff
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|
4818 if (_g1h->is_in_g1_reserved(p)) { |
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|
4819 _par_scan_state->push_on_queue(p); |
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diff
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|
4820 } else { |
4dfb2df418f2
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diff
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|
4821 // The reference field is not in the G1 heap. |
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diff
changeset
|
4822 if (_g1h->perm_gen()->is_in(p)) { |
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|
4823 _copy_perm_obj_cl->do_oop(p); |
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diff
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|
4824 } else { |
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|
4825 _copy_non_heap_obj_cl->do_oop(p); |
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|
4826 } |
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|
4827 } |
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|
4828 } |
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parents:
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diff
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|
4829 } |
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parents:
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diff
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|
4830 }; |
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diff
changeset
|
4831 |
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|
4832 // Serial drain queue closure. Called as the 'complete_gc' |
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parents:
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|
4833 // closure for each discovered list in some of the |
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parents:
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diff
changeset
|
4834 // reference processing phases. |
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diff
changeset
|
4835 |
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parents:
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|
4836 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
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parents:
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|
4837 protected: |
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parents:
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diff
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|
4838 G1CollectedHeap* _g1h; |
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|
4839 G1ParScanThreadState* _par_scan_state; |
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|
4840 |
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|
4841 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
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|
4842 |
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parents:
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|
4843 public: |
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diff
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|
4844 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
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|
4845 _g1h(g1h), |
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diff
changeset
|
4846 _par_scan_state(pss) |
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parents:
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|
4847 { } |
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parents:
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|
4848 |
4dfb2df418f2
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|
4849 void do_void() { |
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|
4850 G1ParScanThreadState* const pss = par_scan_state(); |
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|
4851 pss->trim_queue(); |
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|
4852 } |
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|
4853 }; |
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|
4854 |
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|
4855 // Parallel Reference Processing closures |
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|
4856 |
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|
4857 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
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parents:
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|
4858 // processing during G1 evacuation pauses. |
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diff
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|
4859 |
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|
4860 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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|
4861 private: |
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parents:
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|
4862 G1CollectedHeap* _g1h; |
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|
4863 RefToScanQueueSet* _queues; |
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|
4864 WorkGang* _workers; |
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|
4865 int _active_workers; |
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|
4866 |
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|
4867 public: |
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diff
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|
4868 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
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|
4869 WorkGang* workers, |
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parents:
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diff
changeset
|
4870 RefToScanQueueSet *task_queues, |
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parents:
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diff
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|
4871 int n_workers) : |
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parents:
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diff
changeset
|
4872 _g1h(g1h), |
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parents:
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diff
changeset
|
4873 _queues(task_queues), |
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parents:
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diff
changeset
|
4874 _workers(workers), |
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parents:
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diff
changeset
|
4875 _active_workers(n_workers) |
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parents:
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diff
changeset
|
4876 { |
4dfb2df418f2
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parents:
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diff
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|
4877 assert(n_workers > 0, "shouldn't call this otherwise"); |
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parents:
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|
4878 } |
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parents:
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diff
changeset
|
4879 |
4dfb2df418f2
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parents:
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diff
changeset
|
4880 // Executes the given task using concurrent marking worker threads. |
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parents:
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diff
changeset
|
4881 virtual void execute(ProcessTask& task); |
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parents:
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diff
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|
4882 virtual void execute(EnqueueTask& task); |
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parents:
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|
4883 }; |
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parents:
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diff
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|
4884 |
4dfb2df418f2
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parents:
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diff
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|
4885 // Gang task for possibly parallel reference processing |
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parents:
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diff
changeset
|
4886 |
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|
4887 class G1STWRefProcTaskProxy: public AbstractGangTask { |
4dfb2df418f2
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diff
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|
4888 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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diff
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|
4889 ProcessTask& _proc_task; |
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parents:
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diff
changeset
|
4890 G1CollectedHeap* _g1h; |
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parents:
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diff
changeset
|
4891 RefToScanQueueSet *_task_queues; |
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parents:
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diff
changeset
|
4892 ParallelTaskTerminator* _terminator; |
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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 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
4895 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
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parents:
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diff
changeset
|
4896 G1CollectedHeap* g1h, |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4897 RefToScanQueueSet *task_queues, |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4898 ParallelTaskTerminator* terminator) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4899 AbstractGangTask("Process reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4900 _proc_task(proc_task), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4901 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4902 _task_queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4903 _terminator(terminator) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4904 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4905 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4906 virtual void work(int i) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4907 // The reference processing task executed by a single worker. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4908 ResourceMark rm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4909 HandleMark hm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4910 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4911 G1STWIsAliveClosure is_alive(_g1h); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4912 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4913 G1ParScanThreadState pss(_g1h, i); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4914 |
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parents:
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diff
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|
4915 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4916 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4917 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4918 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4919 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4920 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
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parents:
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diff
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|
4921 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4922 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4923 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4924 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4925 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4926 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4927 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4928 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4929 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4930 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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parents:
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diff
changeset
|
4931 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4932 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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parents:
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diff
changeset
|
4933 // We also need to mark copied objects. |
4dfb2df418f2
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parents:
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diff
changeset
|
4934 copy_non_heap_cl = ©_mark_non_heap_cl; |
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diff
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|
4935 copy_perm_cl = ©_mark_perm_cl; |
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parents:
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diff
changeset
|
4936 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4937 |
4dfb2df418f2
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parents:
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diff
changeset
|
4938 // Keep alive closure. |
4dfb2df418f2
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parents:
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diff
changeset
|
4939 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
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diff
changeset
|
4940 |
4dfb2df418f2
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parents:
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diff
changeset
|
4941 // Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4942 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
4dfb2df418f2
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diff
changeset
|
4943 |
4dfb2df418f2
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parents:
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diff
changeset
|
4944 // Call the reference processing task's work routine. |
4dfb2df418f2
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parents:
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diff
changeset
|
4945 _proc_task.work(i, is_alive, keep_alive, drain_queue); |
4dfb2df418f2
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diff
changeset
|
4946 |
4dfb2df418f2
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parents:
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diff
changeset
|
4947 // Note we cannot assert that the refs array is empty here as not all |
4dfb2df418f2
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diff
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|
4948 // of the processing tasks (specifically phase2 - pp2_work) execute |
4dfb2df418f2
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diff
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|
4949 // the complete_gc closure (which ordinarily would drain the queue) so |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4950 // the queue may not be empty. |
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parents:
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diff
changeset
|
4951 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4952 }; |
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diff
changeset
|
4953 |
4dfb2df418f2
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parents:
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diff
changeset
|
4954 // Driver routine for parallel reference processing. |
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parents:
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diff
changeset
|
4955 // Creates an instance of the ref processing gang |
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parents:
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diff
changeset
|
4956 // task and has the worker threads execute it. |
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parents:
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diff
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|
4957 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
4dfb2df418f2
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parents:
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diff
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|
4958 assert(_workers != NULL, "Need parallel worker threads."); |
4dfb2df418f2
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diff
changeset
|
4959 |
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parents:
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diff
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|
4960 ParallelTaskTerminator terminator(_active_workers, _queues); |
4dfb2df418f2
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|
4961 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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4962 |
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|
4963 _g1h->set_par_threads(_active_workers); |
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|
4964 _workers->run_task(&proc_task_proxy); |
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|
4965 _g1h->set_par_threads(0); |
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|
4966 } |
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|
4967 |
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|
4968 // Gang task for parallel reference enqueueing. |
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|
4969 |
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|
4970 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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|
4971 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
4972 EnqueueTask& _enq_task; |
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|
4973 |
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|
4974 public: |
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|
4975 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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|
4976 AbstractGangTask("Enqueue reference objects in parallel"), |
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|
4977 _enq_task(enq_task) |
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|
4978 { } |
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|
4979 |
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|
4980 virtual void work(int i) { |
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|
4981 _enq_task.work(i); |
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|
4982 } |
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|
4983 }; |
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|
4984 |
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|
4985 // Driver routine for parallel reference enqueing. |
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|
4986 // Creates an instance of the ref enqueueing gang |
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4987 // task and has the worker threads execute it. |
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|
4988 |
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|
4989 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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|
4990 assert(_workers != NULL, "Need parallel worker threads."); |
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|
4991 |
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4992 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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|
4993 |
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|
4994 _g1h->set_par_threads(_active_workers); |
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|
4995 _workers->run_task(&enq_task_proxy); |
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|
4996 _g1h->set_par_threads(0); |
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|
4997 } |
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|
4998 |
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|
4999 // End of weak reference support closures |
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|
5000 |
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5001 // Abstract task used to preserve (i.e. copy) any referent objects |
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5002 // that are in the collection set and are pointed to by reference |
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5003 // objects discovered by the CM ref processor. |
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|
5004 |
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|
5005 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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|
5006 protected: |
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|
5007 G1CollectedHeap* _g1h; |
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|
5008 RefToScanQueueSet *_queues; |
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|
5009 ParallelTaskTerminator _terminator; |
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|
5010 int _n_workers; |
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|
5011 |
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|
5012 public: |
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|
5013 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
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|
5014 AbstractGangTask("ParPreserveCMReferents"), |
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|
5015 _g1h(g1h), |
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|
5016 _queues(task_queues), |
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changeset
|
5017 _terminator(workers, _queues), |
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|
5018 _n_workers(workers) |
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|
5019 { } |
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changeset
|
5020 |
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|
5021 void work(int i) { |
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diff
changeset
|
5022 ResourceMark rm; |
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changeset
|
5023 HandleMark hm; |
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|
5024 |
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|
5025 G1ParScanThreadState pss(_g1h, i); |
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|
5026 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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|
5027 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5028 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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changeset
|
5029 |
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changeset
|
5030 pss.set_evac_closure(&scan_evac_cl); |
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|
5031 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5032 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5033 |
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changeset
|
5034 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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|
5035 |
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diff
changeset
|
5036 |
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changeset
|
5037 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5038 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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changeset
|
5039 |
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changeset
|
5040 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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changeset
|
5041 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
5042 |
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diff
changeset
|
5043 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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changeset
|
5044 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5045 |
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changeset
|
5046 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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diff
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|
5047 // We also need to mark copied objects. |
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diff
changeset
|
5048 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5049 copy_perm_cl = ©_mark_perm_cl; |
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|
5050 } |
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diff
changeset
|
5051 |
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diff
changeset
|
5052 // Is alive closure |
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diff
changeset
|
5053 G1AlwaysAliveClosure always_alive(_g1h); |
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changeset
|
5054 |
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diff
changeset
|
5055 // Copying keep alive closure. Applied to referent objects that need |
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diff
changeset
|
5056 // to be copied. |
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diff
changeset
|
5057 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5058 |
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diff
changeset
|
5059 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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diff
changeset
|
5060 |
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diff
changeset
|
5061 int limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
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diff
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|
5062 int stride = MIN2(MAX2(_n_workers, 1), limit); |
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diff
changeset
|
5063 |
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diff
changeset
|
5064 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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diff
changeset
|
5065 // So this must be true - but assert just in case someone decides to |
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diff
changeset
|
5066 // change the worker ids. |
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diff
changeset
|
5067 assert(0 <= i && i < limit, "sanity"); |
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|
5068 assert(!rp->discovery_is_atomic(), "check this code"); |
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diff
changeset
|
5069 |
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diff
changeset
|
5070 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
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diff
changeset
|
5071 for (int idx = i; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
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parents:
4013
diff
changeset
|
5072 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
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diff
changeset
|
5073 |
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diff
changeset
|
5074 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
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diff
changeset
|
5075 while (iter.has_next()) { |
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diff
changeset
|
5076 // Since discovery is not atomic for the CM ref processor, we |
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diff
changeset
|
5077 // can see some null referent objects. |
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diff
changeset
|
5078 iter.load_ptrs(DEBUG_ONLY(true)); |
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diff
changeset
|
5079 oop ref = iter.obj(); |
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diff
changeset
|
5080 |
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diff
changeset
|
5081 // This will filter nulls. |
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diff
changeset
|
5082 if (iter.is_referent_alive()) { |
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diff
changeset
|
5083 iter.make_referent_alive(); |
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diff
changeset
|
5084 } |
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diff
changeset
|
5085 iter.move_to_next(); |
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diff
changeset
|
5086 } |
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diff
changeset
|
5087 } |
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diff
changeset
|
5088 |
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diff
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|
5089 // Drain the queue - which may cause stealing |
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diff
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|
5090 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
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diff
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|
5091 drain_queue.do_void(); |
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changeset
|
5092 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
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|
5093 assert(pss.refs()->is_empty(), "should be"); |
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|
5094 } |
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|
5095 }; |
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changeset
|
5096 |
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|
5097 // Weak Reference processing during an evacuation pause (part 1). |
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|
5098 void G1CollectedHeap::process_discovered_references() { |
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|
5099 double ref_proc_start = os::elapsedTime(); |
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|
5100 |
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|
5101 ReferenceProcessor* rp = _ref_processor_stw; |
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|
5102 assert(rp->discovery_enabled(), "should have been enabled"); |
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|
5103 |
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|
5104 // Any reference objects, in the collection set, that were 'discovered' |
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|
5105 // by the CM ref processor should have already been copied (either by |
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|
5106 // applying the external root copy closure to the discovered lists, or |
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|
5107 // by following an RSet entry). |
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|
5108 // |
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5109 // But some of the referents, that are in the collection set, that these |
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|
5110 // reference objects point to may not have been copied: the STW ref |
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|
5111 // processor would have seen that the reference object had already |
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|
5112 // been 'discovered' and would have skipped discovering the reference, |
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5113 // but would not have treated the reference object as a regular oop. |
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5114 // As a reult the copy closure would not have been applied to the |
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|
5115 // referent object. |
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|
5116 // |
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|
5117 // We need to explicitly copy these referent objects - the references |
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|
5118 // will be processed at the end of remarking. |
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|
5119 // |
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5120 // We also need to do this copying before we process the reference |
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5121 // objects discovered by the STW ref processor in case one of these |
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5122 // referents points to another object which is also referenced by an |
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5123 // object discovered by the STW ref processor. |
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|
5124 |
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|
5125 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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|
5126 workers()->total_workers() : 1); |
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|
5127 |
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|
5128 set_par_threads(n_workers); |
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|
5129 G1ParPreserveCMReferentsTask keep_cm_referents(this, n_workers, _task_queues); |
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|
5130 |
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|
5131 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
5132 workers()->run_task(&keep_cm_referents); |
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|
5133 } else { |
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diff
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|
5134 keep_cm_referents.work(0); |
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diff
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|
5135 } |
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changeset
|
5136 |
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|
5137 set_par_threads(0); |
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changeset
|
5138 |
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|
5139 // Closure to test whether a referent is alive. |
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|
5140 G1STWIsAliveClosure is_alive(this); |
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|
5141 |
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diff
changeset
|
5142 // Even when parallel reference processing is enabled, the processing |
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diff
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|
5143 // of JNI refs is serial and performed serially by the current thread |
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|
5144 // rather than by a worker. The following PSS will be used for processing |
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|
5145 // JNI refs. |
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diff
changeset
|
5146 |
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diff
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|
5147 // Use only a single queue for this PSS. |
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diff
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|
5148 G1ParScanThreadState pss(this, 0); |
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changeset
|
5149 |
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diff
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|
5150 // We do not embed a reference processor in the copying/scanning |
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diff
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|
5151 // closures while we're actually processing the discovered |
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diff
changeset
|
5152 // reference objects. |
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diff
changeset
|
5153 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
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|
5154 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
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|
5155 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
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|
5156 |
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|
5157 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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|
5158 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5159 pss.set_partial_scan_closure(&partial_scan_cl); |
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changeset
|
5160 |
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diff
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|
5161 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
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diff
changeset
|
5162 |
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diff
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|
5163 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
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|
5164 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
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|
5165 |
4dfb2df418f2
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diff
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|
5166 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
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|
5167 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
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|
5168 |
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diff
changeset
|
5169 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5170 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5171 |
4dfb2df418f2
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diff
changeset
|
5172 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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diff
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|
5173 // We also need to mark copied objects. |
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diff
changeset
|
5174 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5175 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
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diff
changeset
|
5176 } |
4dfb2df418f2
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diff
changeset
|
5177 |
4dfb2df418f2
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diff
changeset
|
5178 // Keep alive closure. |
4dfb2df418f2
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diff
changeset
|
5179 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
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diff
changeset
|
5180 |
4dfb2df418f2
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diff
changeset
|
5181 // Serial Complete GC closure |
4dfb2df418f2
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diff
changeset
|
5182 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
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diff
changeset
|
5183 |
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diff
changeset
|
5184 // Setup the soft refs policy... |
4dfb2df418f2
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diff
changeset
|
5185 rp->setup_policy(false); |
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diff
changeset
|
5186 |
4dfb2df418f2
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diff
changeset
|
5187 if (!rp->processing_is_mt()) { |
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diff
changeset
|
5188 // Serial reference processing... |
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diff
changeset
|
5189 rp->process_discovered_references(&is_alive, |
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diff
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|
5190 &keep_alive, |
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diff
changeset
|
5191 &drain_queue, |
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diff
changeset
|
5192 NULL); |
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diff
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|
5193 } else { |
4dfb2df418f2
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diff
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|
5194 // Parallel reference processing |
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diff
changeset
|
5195 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
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diff
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|
5196 assert(rp->num_q() == active_workers, "sanity"); |
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diff
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|
5197 assert(active_workers <= rp->max_num_q(), "sanity"); |
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diff
changeset
|
5198 |
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diff
changeset
|
5199 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
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diff
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|
5200 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
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diff
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|
5201 } |
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diff
changeset
|
5202 |
4dfb2df418f2
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diff
changeset
|
5203 // We have completed copying any necessary live referent objects |
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diff
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|
5204 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
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diff
changeset
|
5205 // retire any active alloc buffers |
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diff
changeset
|
5206 pss.retire_alloc_buffers(); |
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diff
changeset
|
5207 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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diff
changeset
|
5208 |
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diff
changeset
|
5209 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
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diff
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|
5210 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
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diff
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|
5211 } |
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diff
changeset
|
5212 |
4dfb2df418f2
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diff
changeset
|
5213 // Weak Reference processing during an evacuation pause (part 2). |
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diff
changeset
|
5214 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
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diff
changeset
|
5215 double ref_enq_start = os::elapsedTime(); |
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diff
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|
5216 |
4dfb2df418f2
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diff
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|
5217 ReferenceProcessor* rp = _ref_processor_stw; |
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diff
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|
5218 assert(!rp->discovery_enabled(), "should have been disabled as part of processing"); |
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diff
changeset
|
5219 |
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diff
changeset
|
5220 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
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diff
changeset
|
5221 // the pending list. |
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diff
changeset
|
5222 if (!rp->processing_is_mt()) { |
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|
5223 // Serial reference processing... |
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|
5224 rp->enqueue_discovered_references(); |
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|
5225 } else { |
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|
5226 // Parallel reference enqueuing |
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|
5227 |
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|
5228 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
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|
5229 assert(rp->num_q() == active_workers, "sanity"); |
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|
5230 assert(active_workers <= rp->max_num_q(), "sanity"); |
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|
5231 |
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|
5232 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
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|
5233 rp->enqueue_discovered_references(&par_task_executor); |
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|
5234 } |
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|
5235 |
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|
5236 rp->verify_no_references_recorded(); |
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|
5237 assert(!rp->discovery_enabled(), "should have been disabled"); |
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|
5238 |
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|
5239 // FIXME |
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|
5240 // CM's reference processing also cleans up the string and symbol tables. |
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|
5241 // Should we do that here also? We could, but it is a serial operation |
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|
5242 // and could signicantly increase the pause time. |
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|
5243 |
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|
5244 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
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5245 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
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|
5246 } |
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|
5247 |
342 | 5248 void G1CollectedHeap::evacuate_collection_set() { |
5249 set_evacuation_failed(false); | |
5250 | |
5251 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5252 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5253 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5254 | |
342 | 5255 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
5256 set_par_threads(n_workers); | |
5257 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
5258 | |
5259 init_for_evac_failure(NULL); | |
5260 | |
5261 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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|
5262 |
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|
5263 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 5264 double start_par = os::elapsedTime(); |
3979
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|
5265 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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diff
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|
5266 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 5267 // The individual threads will set their evac-failure closures. |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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890
diff
changeset
|
5268 StrongRootsScope srs(this); |
1709 | 5269 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
342 | 5270 workers()->run_task(&g1_par_task); |
5271 } else { | |
989
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890
diff
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|
5272 StrongRootsScope srs(this); |
342 | 5273 g1_par_task.work(0); |
5274 } | |
5275 | |
5276 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
5277 g1_policy()->record_par_time(par_time); | |
5278 set_par_threads(0); | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
5279 |
3979
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|
5280 // Process any discovered reference objects - we have |
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|
5281 // to do this _before_ we retire the GC alloc regions |
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|
5282 // as we may have to copy some 'reachable' referent |
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|
5283 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
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changeset
|
5284 // not copied during the pause. |
4dfb2df418f2
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diff
changeset
|
5285 process_discovered_references(); |
4dfb2df418f2
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|
5286 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
changeset
|
5287 // Weak root processing. |
fd1d227ef1b9
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diff
changeset
|
5288 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
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johnc
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diff
changeset
|
5289 // non-perm oops then we will need to process the code blobs |
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diff
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|
5290 // here too. |
342 | 5291 { |
3979
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|
5292 G1STWIsAliveClosure is_alive(this); |
342 | 5293 G1KeepAliveClosure keep_alive(this); |
5294 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5295 } | |
3979
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|
5296 |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5297 release_gc_alloc_regions(); |
342 | 5298 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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|
5299 |
889 | 5300 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5301 concurrent_g1_refine()->set_use_cache(true); |
5302 | |
5303 finalize_for_evac_failure(); | |
5304 | |
5305 // Must do this before removing self-forwarding pointers, which clears | |
5306 // the per-region evac-failure flags. | |
5307 concurrent_mark()->complete_marking_in_collection_set(); | |
5308 | |
5309 if (evacuation_failed()) { | |
5310 remove_self_forwarding_pointers(); | |
5311 if (PrintGCDetails) { | |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
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1718
diff
changeset
|
5312 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5313 } else if (PrintGC) { |
5314 gclog_or_tty->print("--"); | |
5315 } | |
5316 } | |
5317 | |
3979
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|
5318 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
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diff
changeset
|
5319 // reference processor's discovered lists. We need to do |
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|
5320 // this after the card table is cleaned (and verified) as |
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|
5321 // the act of enqueuing entries on to the pending list |
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changeset
|
5322 // will log these updates (and dirty their associated |
4dfb2df418f2
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diff
changeset
|
5323 // cards). We need these updates logged to update any |
4dfb2df418f2
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diff
changeset
|
5324 // RSets. |
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diff
changeset
|
5325 enqueue_discovered_references(); |
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|
5326 |
616
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|
5327 if (G1DeferredRSUpdate) { |
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diff
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|
5328 RedirtyLoggedCardTableEntryFastClosure redirty; |
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diff
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|
5329 dirty_card_queue_set().set_closure(&redirty); |
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|
5330 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5331 |
5332 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5333 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
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|
5334 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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|
5335 } |
342 | 5336 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5337 } | |
5338 | |
2173 | 5339 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5340 size_t* pre_used, |
5341 FreeRegionList* free_list, | |
4072 | 5342 OldRegionSet* old_proxy_set, |
2152 | 5343 HumongousRegionSet* humongous_proxy_set, |
2173 | 5344 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5345 bool par) { |
5346 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5347 if (hr->isHumongous()) { | |
5348 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5349 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5350 } else { | |
4072 | 5351 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5352 free_region(hr, pre_used, free_list, par); |
342 | 5353 } |
2173 | 5354 } else { |
5355 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5356 } |
5357 } | |
5358 | |
2152 | 5359 void G1CollectedHeap::free_region(HeapRegion* hr, |
5360 size_t* pre_used, | |
5361 FreeRegionList* free_list, | |
5362 bool par) { | |
5363 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5364 assert(!hr->is_empty(), "the region should not be empty"); | |
5365 assert(free_list != NULL, "pre-condition"); | |
5366 | |
5367 *pre_used += hr->used(); | |
5368 hr->hr_clear(par, true /* clear_space */); | |
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455328d90876
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|
5369 free_list->add_as_head(hr); |
2152 | 5370 } |
5371 | |
5372 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5373 size_t* pre_used, | |
5374 FreeRegionList* free_list, | |
5375 HumongousRegionSet* humongous_proxy_set, | |
5376 bool par) { | |
5377 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5378 assert(free_list != NULL, "pre-condition"); | |
5379 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5380 | |
5381 size_t hr_used = hr->used(); | |
5382 size_t hr_capacity = hr->capacity(); | |
5383 size_t hr_pre_used = 0; | |
5384 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5385 hr->set_notHumongous(); | |
5386 free_region(hr, &hr_pre_used, free_list, par); | |
5387 | |
3766 | 5388 size_t i = hr->hrs_index() + 1; |
2152 | 5389 size_t num = 1; |
3766 | 5390 while (i < n_regions()) { |
5391 HeapRegion* curr_hr = region_at(i); | |
2152 | 5392 if (!curr_hr->continuesHumongous()) { |
5393 break; | |
5394 } | |
5395 curr_hr->set_notHumongous(); | |
5396 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5397 num += 1; | |
5398 i += 1; | |
5399 } | |
5400 assert(hr_pre_used == hr_used, | |
5401 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5402 "should be the same", hr_pre_used, hr_used)); | |
5403 *pre_used += hr_pre_used; | |
5404 } | |
5405 | |
5406 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5407 FreeRegionList* free_list, | |
4072 | 5408 OldRegionSet* old_proxy_set, |
2152 | 5409 HumongousRegionSet* humongous_proxy_set, |
5410 bool par) { | |
5411 if (pre_used > 0) { | |
5412 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5413 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5414 assert(_summary_bytes_used >= pre_used, |
5415 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5416 "should be >= pre_used: "SIZE_FORMAT, | |
5417 _summary_bytes_used, pre_used)); | |
342 | 5418 _summary_bytes_used -= pre_used; |
2152 | 5419 } |
5420 if (free_list != NULL && !free_list->is_empty()) { | |
5421 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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|
5422 _free_list.add_as_head(free_list); |
2152 | 5423 } |
4072 | 5424 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5425 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5426 _old_set.update_from_proxy(old_proxy_set); | |
5427 } | |
2152 | 5428 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5429 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5430 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5431 } |
5432 } | |
5433 | |
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|
5434 class G1ParCleanupCTTask : public AbstractGangTask { |
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diff
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|
5435 CardTableModRefBS* _ct_bs; |
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|
5436 G1CollectedHeap* _g1h; |
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diff
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|
5437 HeapRegion* volatile _su_head; |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5438 public: |
29e7d79232b9
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794
diff
changeset
|
5439 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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3824
diff
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|
5440 G1CollectedHeap* g1h) : |
796
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6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5441 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
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tonyp
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3824
diff
changeset
|
5442 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5443 |
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6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5444 void work(int i) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5445 HeapRegion* r; |
29e7d79232b9
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794
diff
changeset
|
5446 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
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794
diff
changeset
|
5447 clear_cards(r); |
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794
diff
changeset
|
5448 } |
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936
diff
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|
5449 } |
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diff
changeset
|
5450 |
796
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794
diff
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|
5451 void clear_cards(HeapRegion* r) { |
3830
f44782f04dd4
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3824
diff
changeset
|
5452 // Cards of the survivors should have already been dirtied. |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5453 if (!r->is_survivor()) { |
796
29e7d79232b9
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apetrusenko
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diff
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|
5454 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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5455 } |
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|
5456 } |
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|
5457 }; |
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|
5458 |
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5459 #ifndef PRODUCT |
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5460 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
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5461 G1CollectedHeap* _g1h; |
940
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5462 CardTableModRefBS* _ct_bs; |
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5463 public: |
3317
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5464 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
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5465 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
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5466 virtual bool doHeapRegion(HeapRegion* r) { |
1394
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5467 if (r->is_survivor()) { |
3317
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5468 _g1h->verify_dirty_region(r); |
940
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5469 } else { |
3317
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5470 _g1h->verify_not_dirty_region(r); |
940
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5471 } |
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5472 return false; |
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|
5473 } |
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|
5474 }; |
2433
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5475 |
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5476 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
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5477 // All of the region should be clean. |
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5478 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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5479 MemRegion mr(hr->bottom(), hr->end()); |
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5480 ct_bs->verify_not_dirty_region(mr); |
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5481 } |
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5482 |
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5483 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
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5484 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
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5485 // dirty allocated blocks as they allocate them. The thread that |
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5486 // retires each region and replaces it with a new one will do a |
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5487 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
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5488 // not dirty that area (one less thing to have to do while holding |
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5489 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
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5490 // is dirty. |
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|
5491 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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5492 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
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5493 ct_bs->verify_dirty_region(mr); |
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5494 } |
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|
5495 |
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5496 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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5497 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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5498 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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|
5499 verify_dirty_region(hr); |
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|
5500 } |
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|
5501 } |
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|
5502 |
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|
5503 void G1CollectedHeap::verify_dirty_young_regions() { |
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5504 verify_dirty_young_list(_young_list->first_region()); |
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5505 verify_dirty_young_list(_young_list->first_survivor_region()); |
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|
5506 } |
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|
5507 #endif |
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5508 |
342 | 5509 void G1CollectedHeap::cleanUpCardTable() { |
5510 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5511 double start = os::elapsedTime(); | |
5512 | |
4023 | 5513 { |
5514 // Iterate over the dirty cards region list. | |
5515 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
5516 | |
5517 if (ParallelGCThreads > 0) { | |
5518 set_par_threads(workers()->total_workers()); | |
5519 workers()->run_task(&cleanup_task); | |
5520 set_par_threads(0); | |
5521 } else { | |
5522 while (_dirty_cards_region_list) { | |
5523 HeapRegion* r = _dirty_cards_region_list; | |
5524 cleanup_task.clear_cards(r); | |
5525 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
5526 if (_dirty_cards_region_list == r) { | |
5527 // The last region. | |
5528 _dirty_cards_region_list = NULL; | |
5529 } | |
5530 r->set_next_dirty_cards_region(NULL); | |
796
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|
5531 } |
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|
5532 } |
4023 | 5533 #ifndef PRODUCT |
5534 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
5535 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
5536 heap_region_iterate(&cleanup_verifier); | |
5537 } | |
5538 #endif | |
940
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|
5539 } |
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5540 |
342 | 5541 double elapsed = os::elapsedTime() - start; |
3979
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6484982: G1: process references during evacuation pauses
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|
5542 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
342 | 5543 } |
5544 | |
5545 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5546 size_t pre_used = 0; |
5547 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5548 | |
342 | 5549 double young_time_ms = 0.0; |
5550 double non_young_time_ms = 0.0; | |
5551 | |
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|
5552 // Since the collection set is a superset of the the young list, |
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|
5553 // all we need to do to clear the young list is clear its |
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|
5554 // head and length, and unlink any young regions in the code below |
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|
5555 _young_list->clear(); |
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|
5556 |
342 | 5557 G1CollectorPolicy* policy = g1_policy(); |
5558 | |
5559 double start_sec = os::elapsedTime(); | |
5560 bool non_young = true; | |
5561 | |
5562 HeapRegion* cur = cs_head; | |
5563 int age_bound = -1; | |
5564 size_t rs_lengths = 0; | |
5565 | |
5566 while (cur != NULL) { | |
2361 | 5567 assert(!is_on_master_free_list(cur), "sanity"); |
2152 | 5568 |
342 | 5569 if (non_young) { |
5570 if (cur->is_young()) { | |
5571 double end_sec = os::elapsedTime(); | |
5572 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5573 non_young_time_ms += elapsed_ms; | |
5574 | |
5575 start_sec = os::elapsedTime(); | |
5576 non_young = false; | |
5577 } | |
5578 } else { | |
2152 | 5579 double end_sec = os::elapsedTime(); |
5580 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5581 young_time_ms += elapsed_ms; | |
5582 | |
5583 start_sec = os::elapsedTime(); | |
5584 non_young = true; | |
342 | 5585 } |
5586 | |
5587 rs_lengths += cur->rem_set()->occupied(); | |
5588 | |
5589 HeapRegion* next = cur->next_in_collection_set(); | |
5590 assert(cur->in_collection_set(), "bad CS"); | |
5591 cur->set_next_in_collection_set(NULL); | |
5592 cur->set_in_collection_set(false); | |
5593 | |
5594 if (cur->is_young()) { | |
5595 int index = cur->young_index_in_cset(); | |
4090
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5596 assert(index != -1, "invariant"); |
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|
5597 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
342 | 5598 size_t words_survived = _surviving_young_words[index]; |
5599 cur->record_surv_words_in_group(words_survived); | |
1394
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|
5600 |
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|
5601 // At this point the we have 'popped' cur from the collection set |
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|
5602 // (linked via next_in_collection_set()) but it is still in the |
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|
5603 // young list (linked via next_young_region()). Clear the |
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5604 // _next_young_region field. |
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|
5605 cur->set_next_young_region(NULL); |
342 | 5606 } else { |
5607 int index = cur->young_index_in_cset(); | |
4090
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|
5608 assert(index == -1, "invariant"); |
342 | 5609 } |
5610 | |
5611 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5612 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5613 "invariant" ); | |
5614 | |
5615 if (!cur->evacuation_failed()) { | |
5616 // And the region is empty. | |
2152 | 5617 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
5618 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
342 | 5619 } else { |
5620 cur->uninstall_surv_rate_group(); | |
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|
5621 if (cur->is_young()) { |
342 | 5622 cur->set_young_index_in_cset(-1); |
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|
5623 } |
342 | 5624 cur->set_not_young(); |
5625 cur->set_evacuation_failed(false); | |
4072 | 5626 // The region is now considered to be old. |
5627 _old_set.add(cur); | |
342 | 5628 } |
5629 cur = next; | |
5630 } | |
5631 | |
5632 policy->record_max_rs_lengths(rs_lengths); | |
5633 policy->cset_regions_freed(); | |
5634 | |
5635 double end_sec = os::elapsedTime(); | |
5636 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5637 if (non_young) | |
5638 non_young_time_ms += elapsed_ms; | |
5639 else | |
5640 young_time_ms += elapsed_ms; | |
5641 | |
2152 | 5642 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 5643 NULL /* old_proxy_set */, |
2152 | 5644 NULL /* humongous_proxy_set */, |
5645 false /* par */); | |
342 | 5646 policy->record_young_free_cset_time_ms(young_time_ms); |
5647 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5648 } | |
5649 | |
1394
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5650 // This routine is similar to the above but does not record |
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|
5651 // any policy statistics or update free lists; we are abandoning |
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5652 // the current incremental collection set in preparation of a |
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|
5653 // full collection. After the full GC we will start to build up |
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|
5654 // the incremental collection set again. |
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|
5655 // This is only called when we're doing a full collection |
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|
5656 // and is immediately followed by the tearing down of the young list. |
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|
5657 |
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|
5658 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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|
5659 HeapRegion* cur = cs_head; |
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|
5660 |
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|
5661 while (cur != NULL) { |
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|
5662 HeapRegion* next = cur->next_in_collection_set(); |
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|
5663 assert(cur->in_collection_set(), "bad CS"); |
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changeset
|
5664 cur->set_next_in_collection_set(NULL); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5665 cur->set_in_collection_set(false); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5666 cur->set_young_index_in_cset(-1); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5667 cur = next; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5668 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5669 } |
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|
5670 |
2152 | 5671 void G1CollectedHeap::set_free_regions_coming() { |
5672 if (G1ConcRegionFreeingVerbose) { | |
5673 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5674 "setting free regions coming"); | |
5675 } | |
5676 | |
5677 assert(!free_regions_coming(), "pre-condition"); | |
5678 _free_regions_coming = true; | |
342 | 5679 } |
5680 | |
2152 | 5681 void G1CollectedHeap::reset_free_regions_coming() { |
5682 { | |
5683 assert(free_regions_coming(), "pre-condition"); | |
5684 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5685 _free_regions_coming = false; | |
5686 SecondaryFreeList_lock->notify_all(); | |
5687 } | |
5688 | |
5689 if (G1ConcRegionFreeingVerbose) { | |
5690 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5691 "reset free regions coming"); | |
342 | 5692 } |
5693 } | |
5694 | |
2152 | 5695 void G1CollectedHeap::wait_while_free_regions_coming() { |
5696 // Most of the time we won't have to wait, so let's do a quick test | |
5697 // first before we take the lock. | |
5698 if (!free_regions_coming()) { | |
5699 return; | |
5700 } | |
5701 | |
5702 if (G1ConcRegionFreeingVerbose) { | |
5703 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5704 "waiting for free regions"); | |
342 | 5705 } |
5706 | |
5707 { | |
2152 | 5708 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5709 while (free_regions_coming()) { | |
5710 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5711 } |
2152 | 5712 } |
5713 | |
5714 if (G1ConcRegionFreeingVerbose) { | |
5715 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5716 "done waiting for free regions"); | |
5717 } | |
342 | 5718 } |
5719 | |
5720 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5721 assert(heap_lock_held_for_gc(), | |
5722 "the heap lock should already be held by or for this thread"); | |
5723 _young_list->push_region(hr); | |
5724 } | |
5725 | |
5726 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5727 private: | |
5728 bool _success; | |
5729 public: | |
5730 NoYoungRegionsClosure() : _success(true) { } | |
5731 bool doHeapRegion(HeapRegion* r) { | |
5732 if (r->is_young()) { | |
5733 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5734 r->bottom(), r->end()); | |
5735 _success = false; | |
5736 } | |
5737 return false; | |
5738 } | |
5739 bool success() { return _success; } | |
5740 }; | |
5741 | |
1394
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5742 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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5743 bool ret = _young_list->check_list_empty(check_sample); |
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|
5744 |
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|
5745 if (check_heap) { |
342 | 5746 NoYoungRegionsClosure closure; |
5747 heap_region_iterate(&closure); | |
5748 ret = ret && closure.success(); | |
5749 } | |
5750 | |
5751 return ret; | |
5752 } | |
5753 | |
4072 | 5754 class TearDownRegionSetsClosure : public HeapRegionClosure { |
5755 private: | |
5756 OldRegionSet *_old_set; | |
2152 | 5757 |
342 | 5758 public: |
4072 | 5759 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 5760 |
342 | 5761 bool doHeapRegion(HeapRegion* r) { |
4072 | 5762 if (r->is_empty()) { |
5763 // We ignore empty regions, we'll empty the free list afterwards | |
5764 } else if (r->is_young()) { | |
5765 // We ignore young regions, we'll empty the young list afterwards | |
5766 } else if (r->isHumongous()) { | |
5767 // We ignore humongous regions, we're not tearing down the | |
5768 // humongous region set | |
342 | 5769 } else { |
4072 | 5770 // The rest should be old |
5771 _old_set->remove(r); | |
342 | 5772 } |
5773 return false; | |
5774 } | |
5775 | |
4072 | 5776 ~TearDownRegionSetsClosure() { |
5777 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 5778 } |
342 | 5779 }; |
5780 | |
4072 | 5781 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
5782 assert_at_safepoint(true /* should_be_vm_thread */); | |
5783 | |
5784 if (!free_list_only) { | |
5785 TearDownRegionSetsClosure cl(&_old_set); | |
5786 heap_region_iterate(&cl); | |
5787 | |
5788 // Need to do this after the heap iteration to be able to | |
5789 // recognize the young regions and ignore them during the iteration. | |
5790 _young_list->empty_list(); | |
5791 } | |
5792 _free_list.remove_all(); | |
5793 } | |
5794 | |
5795 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
5796 private: | |
5797 bool _free_list_only; | |
5798 OldRegionSet* _old_set; | |
5799 FreeRegionList* _free_list; | |
5800 size_t _total_used; | |
5801 | |
5802 public: | |
5803 RebuildRegionSetsClosure(bool free_list_only, | |
5804 OldRegionSet* old_set, FreeRegionList* free_list) : | |
5805 _free_list_only(free_list_only), | |
5806 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
5807 assert(_free_list->is_empty(), "pre-condition"); | |
5808 if (!free_list_only) { | |
5809 assert(_old_set->is_empty(), "pre-condition"); | |
5810 } | |
5811 } | |
5812 | |
5813 bool doHeapRegion(HeapRegion* r) { | |
5814 if (r->continuesHumongous()) { | |
5815 return false; | |
5816 } | |
5817 | |
5818 if (r->is_empty()) { | |
5819 // Add free regions to the free list | |
5820 _free_list->add_as_tail(r); | |
5821 } else if (!_free_list_only) { | |
5822 assert(!r->is_young(), "we should not come across young regions"); | |
5823 | |
5824 if (r->isHumongous()) { | |
5825 // We ignore humongous regions, we left the humongous set unchanged | |
5826 } else { | |
5827 // The rest should be old, add them to the old set | |
5828 _old_set->add(r); | |
5829 } | |
5830 _total_used += r->used(); | |
5831 } | |
5832 | |
5833 return false; | |
5834 } | |
5835 | |
5836 size_t total_used() { | |
5837 return _total_used; | |
5838 } | |
5839 }; | |
5840 | |
5841 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
5842 assert_at_safepoint(true /* should_be_vm_thread */); | |
5843 | |
5844 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
5845 heap_region_iterate(&cl); | |
5846 | |
5847 if (!free_list_only) { | |
5848 _summary_bytes_used = cl.total_used(); | |
5849 } | |
5850 assert(_summary_bytes_used == recalculate_used(), | |
5851 err_msg("inconsistent _summary_bytes_used, " | |
5852 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
5853 _summary_bytes_used, recalculate_used())); | |
342 | 5854 } |
5855 | |
5856 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5857 _refine_cte_cl->set_concurrent(concurrent); | |
5858 } | |
5859 | |
5860 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5861 HeapRegion* hr = heap_region_containing(p); | |
5862 if (hr == NULL) { | |
5863 return is_in_permanent(p); | |
5864 } else { | |
5865 return hr->is_in(p); | |
5866 } | |
5867 } | |
2152 | 5868 |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5869 // Methods for the mutator alloc region |
f44782f04dd4
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|
5870 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
5871 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
5872 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
5873 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
5874 assert(!force || g1_policy()->can_expand_young_list(), |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5875 "if force is true we should be able to expand the young list"); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5876 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5877 if (force || !young_list_full) { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5878 HeapRegion* new_alloc_region = new_region(word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5879 false /* do_expand */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5880 if (new_alloc_region != NULL) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5881 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5882 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5883 return new_alloc_region; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5884 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5885 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5886 return NULL; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5887 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5888 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5889 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5890 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5891 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5892 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5893 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5894 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5895 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5896 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5897 // 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
|
5898 // 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
|
5899 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5900 g1mm()->update_eden_size(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5901 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5902 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5903 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5904 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5905 return _g1h->new_mutator_alloc_region(word_size, force); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5906 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5907 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5908 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5909 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5910 _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
|
5911 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5912 |
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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|
5913 // Methods for the GC alloc regions |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
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|
5914 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
5915 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
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|
5916 size_t count, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
5917 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
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|
5918 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
5919 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5920 if (count < g1_policy()->max_regions(ap)) { |
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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|
5921 HeapRegion* new_alloc_region = new_region(word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5922 true /* do_expand */); |
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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|
5923 if (new_alloc_region != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
5924 // We really only need to do this for old regions given that we |
f44782f04dd4
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tonyp
parents:
3824
diff
changeset
|
5925 // should never scan survivors. But it doesn't hurt to do it |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5926 // for survivors too. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5927 new_alloc_region->set_saved_mark(); |
f44782f04dd4
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|
5928 if (ap == GCAllocForSurvived) { |
f44782f04dd4
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parents:
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diff
changeset
|
5929 new_alloc_region->set_survivor(); |
f44782f04dd4
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changeset
|
5930 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
f44782f04dd4
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diff
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|
5931 } else { |
f44782f04dd4
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diff
changeset
|
5932 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
f44782f04dd4
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|
5933 } |
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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|
5934 return new_alloc_region; |
f44782f04dd4
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diff
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|
5935 } else { |
f44782f04dd4
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diff
changeset
|
5936 g1_policy()->note_alloc_region_limit_reached(ap); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
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|
5937 } |
f44782f04dd4
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|
5938 } |
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5939 return NULL; |
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5940 } |
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5941 |
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5942 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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5943 size_t allocated_bytes, |
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5944 GCAllocPurpose ap) { |
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5945 alloc_region->note_end_of_copying(); |
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5946 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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5947 if (ap == GCAllocForSurvived) { |
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5948 young_list()->add_survivor_region(alloc_region); |
4072 | 5949 } else { |
5950 _old_set.add(alloc_region); | |
3830
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5951 } |
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5952 _hr_printer.retire(alloc_region); |
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5953 } |
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5954 |
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5955 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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5956 bool force) { |
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5957 assert(!force, "not supported for GC alloc regions"); |
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5958 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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5959 } |
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5960 |
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5961 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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5962 size_t allocated_bytes) { |
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5963 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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5964 GCAllocForSurvived); |
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5965 } |
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5966 |
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5967 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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5968 bool force) { |
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5969 assert(!force, "not supported for GC alloc regions"); |
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5970 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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5971 } |
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5972 |
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5973 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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5974 size_t allocated_bytes) { |
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5975 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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5976 GCAllocForTenured); |
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5977 } |
2433
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5978 // Heap region set verification |
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5979 |
2152 | 5980 class VerifyRegionListsClosure : public HeapRegionClosure { |
5981 private: | |
4072 | 5982 FreeRegionList* _free_list; |
5983 OldRegionSet* _old_set; | |
2152 | 5984 HumongousRegionSet* _humongous_set; |
5985 size_t _region_count; | |
5986 | |
5987 public: | |
4072 | 5988 VerifyRegionListsClosure(OldRegionSet* old_set, |
5989 HumongousRegionSet* humongous_set, | |
2152 | 5990 FreeRegionList* free_list) : |
4072 | 5991 _old_set(old_set), _humongous_set(humongous_set), |
5992 _free_list(free_list), _region_count(0) { } | |
2152 | 5993 |
5994 size_t region_count() { return _region_count; } | |
5995 | |
5996 bool doHeapRegion(HeapRegion* hr) { | |
5997 _region_count += 1; | |
5998 | |
5999 if (hr->continuesHumongous()) { | |
6000 return false; | |
6001 } | |
6002 | |
6003 if (hr->is_young()) { | |
6004 // TODO | |
6005 } else if (hr->startsHumongous()) { | |
6006 _humongous_set->verify_next_region(hr); | |
6007 } else if (hr->is_empty()) { | |
6008 _free_list->verify_next_region(hr); | |
4072 | 6009 } else { |
6010 _old_set->verify_next_region(hr); | |
2152 | 6011 } |
6012 return false; | |
6013 } | |
6014 }; | |
6015 | |
3766 | 6016 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
6017 HeapWord* bottom) { | |
6018 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6019 MemRegion mr(bottom, end); | |
6020 assert(_g1_reserved.contains(mr), "invariant"); | |
6021 // This might return NULL if the allocation fails | |
6022 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
6023 } | |
6024 | |
2152 | 6025 void G1CollectedHeap::verify_region_sets() { |
6026 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6027 | |
6028 // First, check the explicit lists. | |
6029 _free_list.verify(); | |
6030 { | |
6031 // Given that a concurrent operation might be adding regions to | |
6032 // the secondary free list we have to take the lock before | |
6033 // verifying it. | |
6034 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6035 _secondary_free_list.verify(); | |
6036 } | |
4072 | 6037 _old_set.verify(); |
2152 | 6038 _humongous_set.verify(); |
6039 | |
6040 // If a concurrent region freeing operation is in progress it will | |
6041 // be difficult to correctly attributed any free regions we come | |
6042 // across to the correct free list given that they might belong to | |
6043 // one of several (free_list, secondary_free_list, any local lists, | |
6044 // etc.). So, if that's the case we will skip the rest of the | |
6045 // verification operation. Alternatively, waiting for the concurrent | |
6046 // operation to complete will have a non-trivial effect on the GC's | |
6047 // operation (no concurrent operation will last longer than the | |
6048 // interval between two calls to verification) and it might hide | |
6049 // any issues that we would like to catch during testing. | |
6050 if (free_regions_coming()) { | |
6051 return; | |
6052 } | |
6053 | |
2361 | 6054 // Make sure we append the secondary_free_list on the free_list so |
6055 // that all free regions we will come across can be safely | |
6056 // attributed to the free_list. | |
6057 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6058 |
6059 // Finally, make sure that the region accounting in the lists is | |
6060 // consistent with what we see in the heap. | |
4072 | 6061 _old_set.verify_start(); |
2152 | 6062 _humongous_set.verify_start(); |
6063 _free_list.verify_start(); | |
6064 | |
4072 | 6065 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6066 heap_region_iterate(&cl); |
6067 | |
4072 | 6068 _old_set.verify_end(); |
2152 | 6069 _humongous_set.verify_end(); |
6070 _free_list.verify_end(); | |
342 | 6071 } |