Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 3774:c9ca3f51cf41
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
Summary: Remove two unused parameters from the mem_allocate() method and update its uses accordingly.
Reviewed-by: stefank, johnc
author | tonyp |
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date | Thu, 16 Jun 2011 15:51:57 -0400 |
parents | 6747fd0512e0 |
children | e8b0b0392037 |
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" | |
34 #include "gc_implementation/g1/g1MarkSweep.hpp" | |
35 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
36 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
37 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
38 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
39 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
40 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/genOopClosures.inline.hpp" | |
43 #include "memory/generationSpec.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.pcgc.inline.hpp" | |
46 #include "runtime/aprofiler.hpp" | |
47 #include "runtime/vmThread.hpp" | |
342 | 48 |
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49 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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50 |
342 | 51 // turn it on so that the contents of the young list (scan-only / |
52 // to-be-collected) are printed at "strategic" points before / during | |
53 // / after the collection --- this is useful for debugging | |
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54 #define YOUNG_LIST_VERBOSE 0 |
342 | 55 // CURRENT STATUS |
56 // This file is under construction. Search for "FIXME". | |
57 | |
58 // INVARIANTS/NOTES | |
59 // | |
60 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 61 // serialized by acquiring the HeapLock. This happens in mem_allocate |
62 // and allocate_new_tlab, which are the "entry" points to the | |
63 // allocation code from the rest of the JVM. (Note that this does not | |
64 // apply to TLAB allocation, which is not part of this interface: it | |
65 // is done by clients of this interface.) | |
342 | 66 |
67 // Local to this file. | |
68 | |
69 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
70 SuspendibleThreadSet* _sts; | |
71 G1RemSet* _g1rs; | |
72 ConcurrentG1Refine* _cg1r; | |
73 bool _concurrent; | |
74 public: | |
75 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
76 G1RemSet* g1rs, | |
77 ConcurrentG1Refine* cg1r) : | |
78 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
79 {} | |
80 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 81 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
82 // This path is executed by the concurrent refine or mutator threads, | |
83 // concurrently, and so we do not care if card_ptr contains references | |
84 // that point into the collection set. | |
85 assert(!oops_into_cset, "should be"); | |
86 | |
342 | 87 if (_concurrent && _sts->should_yield()) { |
88 // Caller will actually yield. | |
89 return false; | |
90 } | |
91 // Otherwise, we finished successfully; return true. | |
92 return true; | |
93 } | |
94 void set_concurrent(bool b) { _concurrent = b; } | |
95 }; | |
96 | |
97 | |
98 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
99 int _calls; | |
100 G1CollectedHeap* _g1h; | |
101 CardTableModRefBS* _ctbs; | |
102 int _histo[256]; | |
103 public: | |
104 ClearLoggedCardTableEntryClosure() : | |
105 _calls(0) | |
106 { | |
107 _g1h = G1CollectedHeap::heap(); | |
108 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
109 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
110 } | |
111 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
112 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
113 _calls++; | |
114 unsigned char* ujb = (unsigned char*)card_ptr; | |
115 int ind = (int)(*ujb); | |
116 _histo[ind]++; | |
117 *card_ptr = -1; | |
118 } | |
119 return true; | |
120 } | |
121 int calls() { return _calls; } | |
122 void print_histo() { | |
123 gclog_or_tty->print_cr("Card table value histogram:"); | |
124 for (int i = 0; i < 256; i++) { | |
125 if (_histo[i] != 0) { | |
126 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
127 } | |
128 } | |
129 } | |
130 }; | |
131 | |
132 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
133 int _calls; | |
134 G1CollectedHeap* _g1h; | |
135 CardTableModRefBS* _ctbs; | |
136 public: | |
137 RedirtyLoggedCardTableEntryClosure() : | |
138 _calls(0) | |
139 { | |
140 _g1h = G1CollectedHeap::heap(); | |
141 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
142 } | |
143 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
144 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
145 _calls++; | |
146 *card_ptr = 0; | |
147 } | |
148 return true; | |
149 } | |
150 int calls() { return _calls; } | |
151 }; | |
152 | |
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153 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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154 public: |
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155 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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156 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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157 return true; |
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158 } |
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159 }; |
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160 |
342 | 161 YoungList::YoungList(G1CollectedHeap* g1h) |
162 : _g1h(g1h), _head(NULL), | |
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163 _length(0), |
342 | 164 _last_sampled_rs_lengths(0), |
545 | 165 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 166 { |
167 guarantee( check_list_empty(false), "just making sure..." ); | |
168 } | |
169 | |
170 void YoungList::push_region(HeapRegion *hr) { | |
171 assert(!hr->is_young(), "should not already be young"); | |
172 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
173 | |
174 hr->set_next_young_region(_head); | |
175 _head = hr; | |
176 | |
177 hr->set_young(); | |
178 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
179 ++_length; | |
180 } | |
181 | |
182 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 183 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 184 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
185 | |
186 hr->set_next_young_region(_survivor_head); | |
187 if (_survivor_head == NULL) { | |
545 | 188 _survivor_tail = hr; |
342 | 189 } |
190 _survivor_head = hr; | |
191 | |
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 |
342 | 316 for (HeapRegion* curr = _survivor_head; |
317 curr != NULL; | |
318 curr = curr->get_next_young_region()) { | |
319 _g1h->g1_policy()->set_region_survivors(curr); | |
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320 |
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321 // The region is a non-empty survivor so let's add it to |
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322 // the incremental collection set for the next evacuation |
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323 // pause. |
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324 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
342 | 325 } |
326 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
327 | |
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328 _head = _survivor_head; |
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329 _length = _survivor_length; |
342 | 330 if (_survivor_head != NULL) { |
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331 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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332 assert(_survivor_length > 0, "invariant"); |
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333 _survivor_tail->set_next_young_region(NULL); |
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334 } |
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335 |
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336 // Don't clear the survivor list handles until the start of |
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337 // the next evacuation pause - we need it in order to re-tag |
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338 // the survivor regions from this evacuation pause as 'young' |
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339 // at the start of the next. |
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340 |
545 | 341 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 342 |
343 assert(check_list_well_formed(), "young list should be well formed"); | |
344 } | |
345 | |
346 void YoungList::print() { | |
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347 HeapRegion* lists[] = {_head, _survivor_head}; |
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348 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 349 |
350 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
351 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
352 HeapRegion *curr = lists[list]; | |
353 if (curr == NULL) | |
354 gclog_or_tty->print_cr(" empty"); | |
355 while (curr != NULL) { | |
356 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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357 "age: %4d, y: %d, surv: %d", |
342 | 358 curr->bottom(), curr->end(), |
359 curr->top(), | |
360 curr->prev_top_at_mark_start(), | |
361 curr->next_top_at_mark_start(), | |
362 curr->top_at_conc_mark_count(), | |
363 curr->age_in_surv_rate_group_cond(), | |
364 curr->is_young(), | |
365 curr->is_survivor()); | |
366 curr = curr->get_next_young_region(); | |
367 } | |
368 } | |
369 | |
370 gclog_or_tty->print_cr(""); | |
371 } | |
372 | |
796
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373 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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374 { |
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375 // Claim the right to put the region on the dirty cards region list |
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376 // by installing a self pointer. |
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377 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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378 if (next == NULL) { |
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379 HeapRegion* res = (HeapRegion*) |
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380 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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381 NULL); |
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382 if (res == NULL) { |
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383 HeapRegion* head; |
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384 do { |
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385 // Put the region to the dirty cards region list. |
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386 head = _dirty_cards_region_list; |
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387 next = (HeapRegion*) |
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388 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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389 if (next == head) { |
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390 assert(hr->get_next_dirty_cards_region() == hr, |
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391 "hr->get_next_dirty_cards_region() != hr"); |
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392 if (next == NULL) { |
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393 // The last region in the list points to itself. |
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394 hr->set_next_dirty_cards_region(hr); |
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395 } else { |
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396 hr->set_next_dirty_cards_region(next); |
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397 } |
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398 } |
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399 } while (next != head); |
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400 } |
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401 } |
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402 } |
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403 |
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404 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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405 { |
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406 HeapRegion* head; |
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407 HeapRegion* hr; |
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408 do { |
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409 head = _dirty_cards_region_list; |
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410 if (head == NULL) { |
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411 return NULL; |
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412 } |
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413 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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414 if (head == new_head) { |
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415 // The last region. |
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416 new_head = NULL; |
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417 } |
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418 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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419 head); |
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420 } while (hr != head); |
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421 assert(hr != NULL, "invariant"); |
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422 hr->set_next_dirty_cards_region(NULL); |
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423 return hr; |
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424 } |
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425 |
342 | 426 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 427 _cg1r->stop(); |
342 | 428 _cmThread->stop(); |
429 } | |
430 | |
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431 #ifdef ASSERT |
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432 // A region is added to the collection set as it is retired |
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433 // so an address p can point to a region which will be in the |
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434 // collection set but has not yet been retired. This method |
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435 // therefore is only accurate during a GC pause after all |
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436 // regions have been retired. It is used for debugging |
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437 // to check if an nmethod has references to objects that can |
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438 // be move during a partial collection. Though it can be |
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439 // inaccurate, it is sufficient for G1 because the conservative |
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440 // implementation of is_scavengable() for G1 will indicate that |
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441 // all nmethods must be scanned during a partial collection. |
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442 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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443 HeapRegion* hr = heap_region_containing(p); |
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444 return hr != NULL && hr->in_collection_set(); |
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445 } |
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446 #endif |
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447 |
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448 // Returns true if the reference points to an object that |
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449 // can move in an incremental collecction. |
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450 bool G1CollectedHeap::is_scavengable(const void* p) { |
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451 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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452 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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453 HeapRegion* hr = heap_region_containing(p); |
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454 if (hr == NULL) { |
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455 // perm gen (or null) |
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456 return false; |
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457 } else { |
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458 return !hr->isHumongous(); |
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459 } |
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460 } |
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461 |
342 | 462 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
463 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
464 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
465 | |
466 // Count the dirty cards at the start. | |
467 CountNonCleanMemRegionClosure count1(this); | |
468 ct_bs->mod_card_iterate(&count1); | |
469 int orig_count = count1.n(); | |
470 | |
471 // First clear the logged cards. | |
472 ClearLoggedCardTableEntryClosure clear; | |
473 dcqs.set_closure(&clear); | |
474 dcqs.apply_closure_to_all_completed_buffers(); | |
475 dcqs.iterate_closure_all_threads(false); | |
476 clear.print_histo(); | |
477 | |
478 // Now ensure that there's no dirty cards. | |
479 CountNonCleanMemRegionClosure count2(this); | |
480 ct_bs->mod_card_iterate(&count2); | |
481 if (count2.n() != 0) { | |
482 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
483 count2.n(), orig_count); | |
484 } | |
485 guarantee(count2.n() == 0, "Card table should be clean."); | |
486 | |
487 RedirtyLoggedCardTableEntryClosure redirty; | |
488 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
489 dcqs.apply_closure_to_all_completed_buffers(); | |
490 dcqs.iterate_closure_all_threads(false); | |
491 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
492 clear.calls(), orig_count); | |
493 guarantee(redirty.calls() == clear.calls(), | |
494 "Or else mechanism is broken."); | |
495 | |
496 CountNonCleanMemRegionClosure count3(this); | |
497 ct_bs->mod_card_iterate(&count3); | |
498 if (count3.n() != orig_count) { | |
499 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
500 orig_count, count3.n()); | |
501 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
502 } | |
503 | |
504 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
505 } | |
506 | |
507 // Private class members. | |
508 | |
509 G1CollectedHeap* G1CollectedHeap::_g1h; | |
510 | |
511 // Private methods. | |
512 | |
2152 | 513 HeapRegion* |
2361 | 514 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 515 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
516 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
517 if (!_secondary_free_list.is_empty()) { | |
518 if (G1ConcRegionFreeingVerbose) { | |
519 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
520 "secondary_free_list has "SIZE_FORMAT" entries", | |
521 _secondary_free_list.length()); | |
522 } | |
523 // It looks as if there are free regions available on the | |
524 // secondary_free_list. Let's move them to the free_list and try | |
525 // again to allocate from it. | |
526 append_secondary_free_list(); | |
527 | |
528 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
529 "empty we should have moved at least one entry to the free_list"); | |
530 HeapRegion* res = _free_list.remove_head(); | |
531 if (G1ConcRegionFreeingVerbose) { | |
532 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
533 "allocated "HR_FORMAT" from secondary_free_list", | |
534 HR_FORMAT_PARAMS(res)); | |
535 } | |
536 return res; | |
537 } | |
538 | |
539 // Wait here until we get notifed either when (a) there are no | |
540 // more free regions coming or (b) some regions have been moved on | |
541 // the secondary_free_list. | |
542 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
543 } | |
544 | |
545 if (G1ConcRegionFreeingVerbose) { | |
546 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
547 "could not allocate from secondary_free_list"); | |
548 } | |
549 return NULL; | |
550 } | |
551 | |
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552 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
2152 | 553 assert(!isHumongous(word_size) || |
554 word_size <= (size_t) HeapRegion::GrainWords, | |
555 "the only time we use this to allocate a humongous region is " | |
556 "when we are allocating a single humongous region"); | |
557 | |
558 HeapRegion* res; | |
559 if (G1StressConcRegionFreeing) { | |
560 if (!_secondary_free_list.is_empty()) { | |
561 if (G1ConcRegionFreeingVerbose) { | |
562 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
563 "forced to look at the secondary_free_list"); | |
564 } | |
2361 | 565 res = new_region_try_secondary_free_list(); |
2152 | 566 if (res != NULL) { |
567 return res; | |
568 } | |
569 } | |
570 } | |
571 res = _free_list.remove_head_or_null(); | |
572 if (res == NULL) { | |
573 if (G1ConcRegionFreeingVerbose) { | |
574 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
575 "res == NULL, trying the secondary_free_list"); | |
576 } | |
2361 | 577 res = new_region_try_secondary_free_list(); |
2152 | 578 } |
342 | 579 if (res == NULL && do_expand) { |
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580 if (expand(word_size * HeapWordSize)) { |
3766 | 581 // Even though the heap was expanded, it might not have reached |
582 // the desired size. So, we cannot assume that the allocation | |
583 // will succeed. | |
584 res = _free_list.remove_head_or_null(); | |
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585 } |
342 | 586 } |
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587 if (res != NULL) { |
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588 if (G1PrintHeapRegions) { |
3766 | 589 gclog_or_tty->print_cr("new alloc region "HR_FORMAT, |
590 HR_FORMAT_PARAMS(res)); | |
342 | 591 } |
592 } | |
593 return res; | |
594 } | |
595 | |
2152 | 596 HeapRegion* G1CollectedHeap::new_gc_alloc_region(int purpose, |
597 size_t word_size) { | |
342 | 598 HeapRegion* alloc_region = NULL; |
599 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
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600 alloc_region = new_region(word_size, true /* do_expand */); |
342 | 601 if (purpose == GCAllocForSurvived && alloc_region != NULL) { |
545 | 602 alloc_region->set_survivor(); |
342 | 603 } |
604 ++_gc_alloc_region_counts[purpose]; | |
605 } else { | |
606 g1_policy()->note_alloc_region_limit_reached(purpose); | |
607 } | |
608 return alloc_region; | |
609 } | |
610 | |
3766 | 611 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
612 size_t word_size) { | |
2361 | 613 assert(isHumongous(word_size), "word_size should be humongous"); |
614 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
615 | |
3766 | 616 size_t first = G1_NULL_HRS_INDEX; |
2152 | 617 if (num_regions == 1) { |
618 // Only one region to allocate, no need to go through the slower | |
619 // path. The caller will attempt the expasion if this fails, so | |
620 // let's not try to expand here too. | |
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621 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 622 if (hr != NULL) { |
623 first = hr->hrs_index(); | |
624 } else { | |
3766 | 625 first = G1_NULL_HRS_INDEX; |
2152 | 626 } |
627 } else { | |
628 // We can't allocate humongous regions while cleanupComplete() is | |
629 // running, since some of the regions we find to be empty might not | |
630 // yet be added to the free list and it is not straightforward to | |
631 // know which list they are on so that we can remove them. Note | |
632 // that we only need to do this if we need to allocate more than | |
633 // one region to satisfy the current humongous allocation | |
634 // request. If we are only allocating one region we use the common | |
635 // region allocation code (see above). | |
636 wait_while_free_regions_coming(); | |
2361 | 637 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 638 |
639 if (free_regions() >= num_regions) { | |
3766 | 640 first = _hrs.find_contiguous(num_regions); |
641 if (first != G1_NULL_HRS_INDEX) { | |
642 for (size_t i = first; i < first + num_regions; ++i) { | |
643 HeapRegion* hr = region_at(i); | |
2152 | 644 assert(hr->is_empty(), "sanity"); |
2361 | 645 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 646 hr->set_pending_removal(true); |
647 } | |
648 _free_list.remove_all_pending(num_regions); | |
649 } | |
650 } | |
651 } | |
652 return first; | |
653 } | |
654 | |
2361 | 655 HeapWord* |
3766 | 656 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 657 size_t num_regions, |
658 size_t word_size) { | |
3766 | 659 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 660 assert(isHumongous(word_size), "word_size should be humongous"); |
661 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
662 | |
663 // Index of last region in the series + 1. | |
3766 | 664 size_t last = first + num_regions; |
2361 | 665 |
666 // We need to initialize the region(s) we just discovered. This is | |
667 // a bit tricky given that it can happen concurrently with | |
668 // refinement threads refining cards on these regions and | |
669 // potentially wanting to refine the BOT as they are scanning | |
670 // those cards (this can happen shortly after a cleanup; see CR | |
671 // 6991377). So we have to set up the region(s) carefully and in | |
672 // a specific order. | |
673 | |
674 // The word size sum of all the regions we will allocate. | |
675 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
676 assert(word_size <= word_size_sum, "sanity"); | |
677 | |
678 // This will be the "starts humongous" region. | |
3766 | 679 HeapRegion* first_hr = region_at(first); |
2361 | 680 // The header of the new object will be placed at the bottom of |
681 // the first region. | |
682 HeapWord* new_obj = first_hr->bottom(); | |
683 // This will be the new end of the first region in the series that | |
684 // should also match the end of the last region in the seriers. | |
685 HeapWord* new_end = new_obj + word_size_sum; | |
686 // This will be the new top of the first region that will reflect | |
687 // this allocation. | |
688 HeapWord* new_top = new_obj + word_size; | |
689 | |
690 // First, we need to zero the header of the space that we will be | |
691 // allocating. When we update top further down, some refinement | |
692 // threads might try to scan the region. By zeroing the header we | |
693 // ensure that any thread that will try to scan the region will | |
694 // come across the zero klass word and bail out. | |
695 // | |
696 // NOTE: It would not have been correct to have used | |
697 // CollectedHeap::fill_with_object() and make the space look like | |
698 // an int array. The thread that is doing the allocation will | |
699 // later update the object header to a potentially different array | |
700 // type and, for a very short period of time, the klass and length | |
701 // fields will be inconsistent. This could cause a refinement | |
702 // thread to calculate the object size incorrectly. | |
703 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
704 | |
705 // We will set up the first region as "starts humongous". This | |
706 // will also update the BOT covering all the regions to reflect | |
707 // that there is a single object that starts at the bottom of the | |
708 // first region. | |
709 first_hr->set_startsHumongous(new_top, new_end); | |
710 | |
711 // Then, if there are any, we will set up the "continues | |
712 // humongous" regions. | |
713 HeapRegion* hr = NULL; | |
3766 | 714 for (size_t i = first + 1; i < last; ++i) { |
715 hr = region_at(i); | |
2361 | 716 hr->set_continuesHumongous(first_hr); |
717 } | |
718 // If we have "continues humongous" regions (hr != NULL), then the | |
719 // end of the last one should match new_end. | |
720 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
721 | |
722 // Up to this point no concurrent thread would have been able to | |
723 // do any scanning on any region in this series. All the top | |
724 // fields still point to bottom, so the intersection between | |
725 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
726 // update the top fields, we'll do a storestore to make sure that | |
727 // no thread sees the update to top before the zeroing of the | |
728 // object header and the BOT initialization. | |
729 OrderAccess::storestore(); | |
730 | |
731 // Now that the BOT and the object header have been initialized, | |
732 // we can update top of the "starts humongous" region. | |
733 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
734 "new_top should be in this region"); | |
735 first_hr->set_top(new_top); | |
736 | |
737 // Now, we will update the top fields of the "continues humongous" | |
738 // regions. The reason we need to do this is that, otherwise, | |
739 // these regions would look empty and this will confuse parts of | |
740 // G1. For example, the code that looks for a consecutive number | |
741 // of empty regions will consider them empty and try to | |
742 // re-allocate them. We can extend is_empty() to also include | |
743 // !continuesHumongous(), but it is easier to just update the top | |
744 // fields here. The way we set top for all regions (i.e., top == | |
745 // end for all regions but the last one, top == new_top for the | |
746 // last one) is actually used when we will free up the humongous | |
747 // region in free_humongous_region(). | |
748 hr = NULL; | |
3766 | 749 for (size_t i = first + 1; i < last; ++i) { |
750 hr = region_at(i); | |
2361 | 751 if ((i + 1) == last) { |
752 // last continues humongous region | |
753 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
754 "new_top should fall on this region"); | |
755 hr->set_top(new_top); | |
756 } else { | |
757 // not last one | |
758 assert(new_top > hr->end(), "new_top should be above this region"); | |
759 hr->set_top(hr->end()); | |
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) { |
2188
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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 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 802 // Even though the heap was expanded, it might not have |
803 // reached the desired size. So, we cannot assume that the | |
804 // allocation will succeed. | |
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805 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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806 } |
2152 | 807 } |
808 } | |
809 | |
2361 | 810 HeapWord* result = NULL; |
3766 | 811 if (first != G1_NULL_HRS_INDEX) { |
2361 | 812 result = |
813 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
814 assert(result != NULL, "it should always return a valid result"); | |
2152 | 815 } |
816 | |
817 verify_region_sets_optional(); | |
2361 | 818 |
819 return result; | |
342 | 820 } |
821 | |
1973 | 822 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
823 assert_heap_not_locked_and_not_at_safepoint(); | |
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824 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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825 |
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826 unsigned int dummy_gc_count_before; |
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827 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 828 } |
829 | |
830 HeapWord* | |
831 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 832 bool* gc_overhead_limit_was_exceeded) { |
833 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 834 |
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835 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 836 for (int try_count = 1; /* we'll return */; try_count += 1) { |
837 unsigned int gc_count_before; | |
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838 |
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839 HeapWord* result = NULL; |
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840 if (!isHumongous(word_size)) { |
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841 result = attempt_allocation(word_size, &gc_count_before); |
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842 } else { |
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843 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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844 } |
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845 if (result != NULL) { |
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846 return result; |
342 | 847 } |
848 | |
849 // Create the garbage collection operation... | |
1973 | 850 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 851 // ...and get the VM thread to execute it. |
852 VMThread::execute(&op); | |
1973 | 853 |
854 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
855 // If the operation was successful we'll return the result even | |
856 // if it is NULL. If the allocation attempt failed immediately | |
857 // after a Full GC, it's unlikely we'll be able to allocate now. | |
858 HeapWord* result = op.result(); | |
859 if (result != NULL && !isHumongous(word_size)) { | |
860 // Allocations that take place on VM operations do not do any | |
861 // card dirtying and we have to do it here. We only have to do | |
862 // this for non-humongous allocations, though. | |
863 dirty_young_block(result, word_size); | |
864 } | |
342 | 865 return result; |
1973 | 866 } else { |
867 assert(op.result() == NULL, | |
868 "the result should be NULL if the VM op did not succeed"); | |
342 | 869 } |
870 | |
871 // Give a warning if we seem to be looping forever. | |
872 if ((QueuedAllocationWarningCount > 0) && | |
873 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 874 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 875 } |
876 } | |
1973 | 877 |
878 ShouldNotReachHere(); | |
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879 return NULL; |
342 | 880 } |
881 | |
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882 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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883 unsigned int *gc_count_before_ret) { |
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884 // Make sure you read the note in attempt_allocation_humongous(). |
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885 |
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886 assert_heap_not_locked_and_not_at_safepoint(); |
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887 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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888 "be called for humongous allocation requests"); |
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889 |
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890 // We should only get here after the first-level allocation attempt |
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891 // (attempt_allocation()) failed to allocate. |
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892 |
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893 // We will loop until a) we manage to successfully perform the |
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894 // allocation or b) we successfully schedule a collection which |
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895 // fails to perform the allocation. b) is the only case when we'll |
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896 // return NULL. |
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897 HeapWord* result = NULL; |
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898 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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899 bool should_try_gc; |
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900 unsigned int gc_count_before; |
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901 |
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902 { |
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903 MutexLockerEx x(Heap_lock); |
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904 |
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905 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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906 false /* bot_updates */); |
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907 if (result != NULL) { |
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908 return result; |
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909 } |
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910 |
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911 // If we reach here, attempt_allocation_locked() above failed to |
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912 // allocate a new region. So the mutator alloc region should be NULL. |
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913 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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|
914 |
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915 if (GC_locker::is_active_and_needs_gc()) { |
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916 if (g1_policy()->can_expand_young_list()) { |
abdfc822206f
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917 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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|
918 false /* bot_updates */); |
abdfc822206f
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|
919 if (result != NULL) { |
abdfc822206f
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|
920 return result; |
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|
921 } |
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|
922 } |
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|
923 should_try_gc = false; |
abdfc822206f
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|
924 } else { |
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|
925 // Read the GC count while still holding the Heap_lock. |
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|
926 gc_count_before = SharedHeap::heap()->total_collections(); |
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|
927 should_try_gc = true; |
abdfc822206f
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|
928 } |
abdfc822206f
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|
929 } |
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|
930 |
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diff
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|
931 if (should_try_gc) { |
abdfc822206f
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|
932 bool succeeded; |
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|
933 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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|
934 if (result != NULL) { |
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|
935 assert(succeeded, "only way to get back a non-NULL result"); |
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|
936 return result; |
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|
937 } |
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|
938 |
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diff
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|
939 if (succeeded) { |
abdfc822206f
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|
940 // If we get here we successfully scheduled a collection which |
abdfc822206f
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|
941 // failed to allocate. No point in trying to allocate |
abdfc822206f
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|
942 // further. We'll just return NULL. |
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|
943 MutexLockerEx x(Heap_lock); |
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|
944 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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|
945 return NULL; |
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|
946 } |
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|
947 } else { |
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|
948 GC_locker::stall_until_clear(); |
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|
949 } |
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|
950 |
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|
951 // We can reach here if we were unsuccessul in scheduling a |
abdfc822206f
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|
952 // collection (because another thread beat us to it) or if we were |
abdfc822206f
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|
953 // stalled due to the GC locker. In either can we should retry the |
abdfc822206f
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|
954 // allocation attempt in case another thread successfully |
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|
955 // performed a collection and reclaimed enough space. We do the |
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|
956 // first attempt (without holding the Heap_lock) here and the |
abdfc822206f
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|
957 // follow-on attempt will be at the start of the next loop |
abdfc822206f
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|
958 // iteration (after taking the Heap_lock). |
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|
959 result = _mutator_alloc_region.attempt_allocation(word_size, |
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|
960 false /* bot_updates */); |
abdfc822206f
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parents:
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diff
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|
961 if (result != NULL ){ |
abdfc822206f
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parents:
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diff
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|
962 return result; |
abdfc822206f
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parents:
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diff
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|
963 } |
abdfc822206f
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parents:
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diff
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|
964 |
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diff
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|
965 // Give a warning if we seem to be looping forever. |
abdfc822206f
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|
966 if ((QueuedAllocationWarningCount > 0) && |
abdfc822206f
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|
967 (try_count % QueuedAllocationWarningCount == 0)) { |
abdfc822206f
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|
968 warning("G1CollectedHeap::attempt_allocation_slow() " |
abdfc822206f
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diff
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|
969 "retries %d times", try_count); |
abdfc822206f
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parents:
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diff
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|
970 } |
abdfc822206f
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parents:
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diff
changeset
|
971 } |
abdfc822206f
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parents:
2432
diff
changeset
|
972 |
abdfc822206f
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parents:
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diff
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|
973 ShouldNotReachHere(); |
abdfc822206f
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parents:
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diff
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|
974 return NULL; |
abdfc822206f
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parents:
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diff
changeset
|
975 } |
abdfc822206f
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parents:
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diff
changeset
|
976 |
abdfc822206f
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diff
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|
977 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
abdfc822206f
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|
978 unsigned int * gc_count_before_ret) { |
abdfc822206f
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parents:
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diff
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|
979 // The structure of this method has a lot of similarities to |
abdfc822206f
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2432
diff
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|
980 // attempt_allocation_slow(). The reason these two were not merged |
abdfc822206f
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|
981 // into a single one is that such a method would require several "if |
abdfc822206f
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|
982 // allocation is not humongous do this, otherwise do that" |
abdfc822206f
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diff
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|
983 // conditional paths which would obscure its flow. In fact, an early |
abdfc822206f
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tonyp
parents:
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diff
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|
984 // version of this code did use a unified method which was harder to |
abdfc822206f
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tonyp
parents:
2432
diff
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|
985 // follow and, as a result, it had subtle bugs that were hard to |
abdfc822206f
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|
986 // track down. So keeping these two methods separate allows each to |
abdfc822206f
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parents:
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diff
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|
987 // be more readable. It will be good to keep these two in sync as |
abdfc822206f
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tonyp
parents:
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diff
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|
988 // much as possible. |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
989 |
abdfc822206f
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parents:
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diff
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|
990 assert_heap_not_locked_and_not_at_safepoint(); |
abdfc822206f
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diff
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|
991 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
abdfc822206f
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diff
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|
992 "should only be called for humongous allocations"); |
abdfc822206f
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diff
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|
993 |
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parents:
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diff
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|
994 // We will loop until a) we manage to successfully perform the |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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diff
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|
995 // allocation or b) we successfully schedule a collection which |
abdfc822206f
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parents:
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diff
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|
996 // fails to perform the allocation. b) is the only case when we'll |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
changeset
|
997 // return NULL. |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
998 HeapWord* result = NULL; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
999 for (int try_count = 1; /* we'll return */; try_count += 1) { |
abdfc822206f
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diff
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|
1000 bool should_try_gc; |
abdfc822206f
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diff
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|
1001 unsigned int gc_count_before; |
abdfc822206f
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diff
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|
1002 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1003 { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
1004 MutexLockerEx x(Heap_lock); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1005 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
1006 // Given that humongous objects are not allocated in young |
abdfc822206f
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diff
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|
1007 // regions, we'll first try to do the allocation without doing a |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1008 // collection hoping that there's enough space in the heap. |
abdfc822206f
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diff
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|
1009 result = humongous_obj_allocate(word_size); |
abdfc822206f
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diff
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|
1010 if (result != NULL) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
1011 return result; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
1012 } |
abdfc822206f
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diff
changeset
|
1013 |
abdfc822206f
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diff
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|
1014 if (GC_locker::is_active_and_needs_gc()) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
1015 should_try_gc = false; |
abdfc822206f
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parents:
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diff
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|
1016 } else { |
abdfc822206f
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diff
changeset
|
1017 // Read the GC count while still holding the Heap_lock. |
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|
1018 gc_count_before = SharedHeap::heap()->total_collections(); |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1019 should_try_gc = true; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1020 } |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1021 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1022 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1023 if (should_try_gc) { |
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diff
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|
1024 // If we failed to allocate the humongous object, we should try to |
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diff
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|
1025 // do a collection pause (if we're allowed) in case it reclaims |
abdfc822206f
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|
1026 // enough space for the allocation to succeed after the pause. |
abdfc822206f
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diff
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|
1027 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1028 bool succeeded; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1029 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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|
1030 if (result != NULL) { |
abdfc822206f
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diff
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|
1031 assert(succeeded, "only way to get back a non-NULL result"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
1032 return result; |
abdfc822206f
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parents:
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diff
changeset
|
1033 } |
abdfc822206f
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diff
changeset
|
1034 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1035 if (succeeded) { |
abdfc822206f
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diff
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|
1036 // If we get here we successfully scheduled a collection which |
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diff
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|
1037 // failed to allocate. No point in trying to allocate |
abdfc822206f
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parents:
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diff
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|
1038 // further. We'll just return NULL. |
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diff
changeset
|
1039 MutexLockerEx x(Heap_lock); |
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diff
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|
1040 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1041 return NULL; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
changeset
|
1042 } |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1043 } else { |
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diff
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|
1044 GC_locker::stall_until_clear(); |
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1045 } |
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1046 |
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1047 // We can reach here if we were unsuccessul in scheduling a |
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1048 // collection (because another thread beat us to it) or if we were |
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1049 // stalled due to the GC locker. In either can we should retry the |
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1050 // allocation attempt in case another thread successfully |
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1051 // performed a collection and reclaimed enough space. Give a |
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1052 // warning if we seem to be looping forever. |
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1053 |
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1054 if ((QueuedAllocationWarningCount > 0) && |
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1055 (try_count % QueuedAllocationWarningCount == 0)) { |
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1056 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1057 "retries %d times", try_count); |
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1058 } |
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1059 } |
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1060 |
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1061 ShouldNotReachHere(); |
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1062 return NULL; |
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1063 } |
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1064 |
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1065 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1066 bool expect_null_mutator_alloc_region) { |
2152 | 1067 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1068 assert(_mutator_alloc_region.get() == NULL || |
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1069 !expect_null_mutator_alloc_region, |
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1070 "the current alloc region was unexpectedly found to be non-NULL"); |
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1071 |
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1072 if (!isHumongous(word_size)) { |
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1073 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1074 false /* bot_updates */); |
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1075 } else { |
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1076 return humongous_obj_allocate(word_size); |
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1077 } |
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1078 |
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1079 ShouldNotReachHere(); |
342 | 1080 } |
1081 | |
636 | 1082 void G1CollectedHeap::abandon_gc_alloc_regions() { |
1083 // first, make sure that the GC alloc region list is empty (it should!) | |
1084 assert(_gc_alloc_region_list == NULL, "invariant"); | |
1085 release_gc_alloc_regions(true /* totally */); | |
1086 } | |
1087 | |
342 | 1088 class PostMCRemSetClearClosure: public HeapRegionClosure { |
1089 ModRefBarrierSet* _mr_bs; | |
1090 public: | |
1091 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1092 bool doHeapRegion(HeapRegion* r) { | |
1093 r->reset_gc_time_stamp(); | |
1094 if (r->continuesHumongous()) | |
1095 return false; | |
1096 HeapRegionRemSet* hrrs = r->rem_set(); | |
1097 if (hrrs != NULL) hrrs->clear(); | |
1098 // You might think here that we could clear just the cards | |
1099 // corresponding to the used region. But no: if we leave a dirty card | |
1100 // in a region we might allocate into, then it would prevent that card | |
1101 // from being enqueued, and cause it to be missed. | |
1102 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1103 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1104 return false; | |
1105 } | |
1106 }; | |
1107 | |
1108 | |
1109 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1110 ModRefBarrierSet* _mr_bs; | |
1111 public: | |
1112 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1113 bool doHeapRegion(HeapRegion* r) { | |
1114 if (r->continuesHumongous()) return false; | |
1115 if (r->used_region().word_size() != 0) { | |
1116 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1117 } | |
1118 return false; | |
1119 } | |
1120 }; | |
1121 | |
626
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1122 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1123 G1CollectedHeap* _g1h; |
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1124 UpdateRSOopClosure _cl; |
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1125 int _worker_i; |
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1126 public: |
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1127 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1128 _cl(g1->g1_rem_set(), worker_i), |
626
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1129 _worker_i(worker_i), |
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1130 _g1h(g1) |
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1131 { } |
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1132 |
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1133 bool doHeapRegion(HeapRegion* r) { |
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1134 if (!r->continuesHumongous()) { |
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1135 _cl.set_from(r); |
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1136 r->oop_iterate(&_cl); |
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1137 } |
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1138 return false; |
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1139 } |
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1140 }; |
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1141 |
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1142 class ParRebuildRSTask: public AbstractGangTask { |
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1143 G1CollectedHeap* _g1; |
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1144 public: |
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1145 ParRebuildRSTask(G1CollectedHeap* g1) |
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1146 : AbstractGangTask("ParRebuildRSTask"), |
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1147 _g1(g1) |
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1148 { } |
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1149 |
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1150 void work(int i) { |
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1151 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1152 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1153 HeapRegion::RebuildRSClaimValue); |
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1154 } |
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1155 }; |
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1156 |
1973 | 1157 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1158 bool clear_all_soft_refs, |
342 | 1159 size_t word_size) { |
2152 | 1160 assert_at_safepoint(true /* should_be_vm_thread */); |
1161 | |
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1162 if (GC_locker::check_active_before_gc()) { |
1973 | 1163 return false; |
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1164 } |
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1165 |
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1166 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1167 ResourceMark rm; |
1168 | |
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1169 if (PrintHeapAtGC) { |
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1170 Universe::print_heap_before_gc(); |
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1171 } |
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1172 |
2152 | 1173 verify_region_sets_optional(); |
342 | 1174 |
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1175 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1176 collector_policy()->should_clear_all_soft_refs(); |
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1177 |
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1178 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1179 |
342 | 1180 { |
1181 IsGCActiveMark x; | |
1182 | |
1183 // Timing | |
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1184 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1185 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1186 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1187 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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1188 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1189 PrintGC, true, gclog_or_tty); |
342 | 1190 |
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1191 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
3356
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1192 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
1089
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1193 |
342 | 1194 double start = os::elapsedTime(); |
1195 g1_policy()->record_full_collection_start(); | |
1196 | |
2152 | 1197 wait_while_free_regions_coming(); |
2361 | 1198 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1199 |
342 | 1200 gc_prologue(true); |
838
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1201 increment_total_collections(true /* full gc */); |
342 | 1202 |
1203 size_t g1h_prev_used = used(); | |
1204 assert(used() == recalculate_used(), "Should be equal"); | |
1205 | |
1206 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1207 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1208 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1209 prepare_for_verify(); |
3772
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1210 Universe::verify(/* allow dirty */ true, |
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1211 /* silent */ false, |
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1212 /* option */ VerifyOption_G1UsePrevMarking); |
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1213 |
342 | 1214 } |
1215 | |
1216 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1217 | |
1218 // We want to discover references, but not process them yet. | |
1219 // This mode is disabled in | |
1220 // instanceRefKlass::process_discovered_references if the | |
1221 // generation does some collection work, or | |
1222 // instanceRefKlass::enqueue_discovered_references if the | |
1223 // generation returns without doing any work. | |
1224 ref_processor()->disable_discovery(); | |
1225 ref_processor()->abandon_partial_discovery(); | |
1226 ref_processor()->verify_no_references_recorded(); | |
1227 | |
1228 // Abandon current iterations of concurrent marking and concurrent | |
1229 // refinement, if any are in progress. | |
1230 concurrent_mark()->abort(); | |
1231 | |
1232 // Make sure we'll choose a new allocation region afterwards. | |
2433
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1233 release_mutator_alloc_region(); |
636 | 1234 abandon_gc_alloc_regions(); |
1861 | 1235 g1_rem_set()->cleanupHRRS(); |
342 | 1236 tear_down_region_lists(); |
1394
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1237 |
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1238 // We may have added regions to the current incremental collection |
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1239 // set between the last GC or pause and now. We need to clear the |
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1240 // incremental collection set and then start rebuilding it afresh |
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1241 // after this full GC. |
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1242 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1243 g1_policy()->clear_incremental_cset(); |
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1244 g1_policy()->stop_incremental_cset_building(); |
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1245 |
342 | 1246 if (g1_policy()->in_young_gc_mode()) { |
1247 empty_young_list(); | |
1248 g1_policy()->set_full_young_gcs(true); | |
1249 } | |
1250 | |
1974
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1251 // See the comment in G1CollectedHeap::ref_processing_init() about |
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1252 // how reference processing currently works in G1. |
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1253 |
342 | 1254 // Temporarily make reference _discovery_ single threaded (non-MT). |
2369
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1255 ReferenceProcessorMTDiscoveryMutator rp_disc_ser(ref_processor(), false); |
342 | 1256 |
1257 // Temporarily make refs discovery atomic | |
1258 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
1259 | |
1260 // Temporarily clear _is_alive_non_header | |
1261 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
1262 | |
1263 ref_processor()->enable_discovery(); | |
1387
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|
1264 ref_processor()->setup_policy(do_clear_all_soft_refs); |
342 | 1265 // Do collection work |
1266 { | |
1267 HandleMark hm; // Discard invalid handles created during gc | |
1387
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1268 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs); |
342 | 1269 } |
2152 | 1270 assert(free_regions() == 0, "we should not have added any free regions"); |
342 | 1271 rebuild_region_lists(); |
1272 | |
1273 _summary_bytes_used = recalculate_used(); | |
1274 | |
1275 ref_processor()->enqueue_discovered_references(); | |
1276 | |
1277 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1278 | |
1089
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1279 MemoryService::track_memory_usage(); |
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1280 |
342 | 1281 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1282 HandleMark hm; // Discard invalid handles created during verification | |
1283 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
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|
1284 prepare_for_verify(); |
3772
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|
1285 Universe::verify(/* allow dirty */ false, |
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|
1286 /* silent */ false, |
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|
1287 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1288 |
342 | 1289 } |
1290 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
1291 | |
1292 reset_gc_time_stamp(); | |
1293 // Since everything potentially moved, we will clear all remembered | |
626
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1294 // sets, and clear all cards. Later we will rebuild remebered |
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1295 // sets. We will also reset the GC time stamps of the regions. |
342 | 1296 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1297 heap_region_iterate(&rs_clear); | |
1298 | |
1299 // Resize the heap if necessary. | |
1656
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|
1300 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1301 |
1302 if (_cg1r->use_cache()) { | |
1303 _cg1r->clear_and_record_card_counts(); | |
1304 _cg1r->clear_hot_cache(); | |
1305 } | |
1306 | |
626
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1307 // Rebuild remembered sets of all regions. |
1833
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1308 |
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1309 if (G1CollectedHeap::use_parallel_gc_threads()) { |
626
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1310 ParRebuildRSTask rebuild_rs_task(this); |
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1311 assert(check_heap_region_claim_values( |
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1312 HeapRegion::InitialClaimValue), "sanity check"); |
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|
1313 set_par_threads(workers()->total_workers()); |
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|
1314 workers()->run_task(&rebuild_rs_task); |
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|
1315 set_par_threads(0); |
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1316 assert(check_heap_region_claim_values( |
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1317 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1318 reset_heap_region_claim_values(); |
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|
1319 } else { |
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1320 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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1321 heap_region_iterate(&rebuild_rs); |
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1322 } |
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1323 |
342 | 1324 if (PrintGC) { |
1325 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1326 } | |
1327 | |
1328 if (true) { // FIXME | |
1329 // Ask the permanent generation to adjust size for full collections | |
1330 perm()->compute_new_size(); | |
1331 } | |
1332 | |
1394
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1333 // Start a new incremental collection set for the next pause |
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1334 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1335 g1_policy()->start_incremental_cset_building(); |
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1336 |
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1337 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1338 // regions to the incremental collection set for the next |
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1339 // evacuation pause. |
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1340 clear_cset_fast_test(); |
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1341 |
2433
abdfc822206f
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|
1342 init_mutator_alloc_region(); |
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|
1343 |
342 | 1344 double end = os::elapsedTime(); |
1345 g1_policy()->record_full_collection_end(); | |
1346 | |
546
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1347 #ifdef TRACESPINNING |
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1348 ParallelTaskTerminator::print_termination_counts(); |
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|
1349 #endif |
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|
1350 |
342 | 1351 gc_epilogue(true); |
1352 | |
794 | 1353 // Discard all rset updates |
1354 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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|
1355 assert(!G1DeferredRSUpdate |
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|
1356 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1357 } |
1358 | |
1359 if (g1_policy()->in_young_gc_mode()) { | |
1360 _young_list->reset_sampled_info(); | |
1394
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1361 // At this point there should be no regions in the |
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1362 // entire heap tagged as young. |
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1363 assert( check_young_list_empty(true /* check_heap */), |
342 | 1364 "young list should be empty at this point"); |
1365 } | |
838
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|
1366 |
1656
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|
1367 // Update the number of full collections that have been completed. |
2030
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7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
1368 increment_full_collections_completed(false /* concurrent */); |
1656
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|
1369 |
3766 | 1370 _hrs.verify_optional(); |
2152 | 1371 verify_region_sets_optional(); |
1372 | |
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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1373 if (PrintHeapAtGC) { |
0316eac49d5a
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|
1374 Universe::print_heap_after_gc(); |
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1375 } |
3289
b52782ae3880
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|
1376 g1mm()->update_counters(); |
1973 | 1377 |
1378 return true; | |
342 | 1379 } |
1380 | |
1381 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1382 // do_collection() will return whether it succeeded in performing |
1383 // the GC. Currently, there is no facility on the | |
1384 // do_full_collection() API to notify the caller than the collection | |
1385 // did not succeed (e.g., because it was locked out by the GC | |
1386 // locker). So, right now, we'll ignore the return value. | |
1387 bool dummy = do_collection(true, /* explicit_gc */ | |
1388 clear_all_soft_refs, | |
1389 0 /* word_size */); | |
342 | 1390 } |
1391 | |
1392 // This code is mostly copied from TenuredGeneration. | |
1393 void | |
1394 G1CollectedHeap:: | |
1395 resize_if_necessary_after_full_collection(size_t word_size) { | |
1396 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1397 | |
1398 // Include the current allocation, if any, and bytes that will be | |
1399 // pre-allocated to support collections, as "used". | |
1400 const size_t used_after_gc = used(); | |
1401 const size_t capacity_after_gc = capacity(); | |
1402 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1403 | |
1717
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1404 // This is enforced in arguments.cpp. |
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1405 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1406 "otherwise the code below doesn't make sense"); |
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1407 |
342 | 1408 // We don't have floating point command-line arguments |
1717
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1409 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1410 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1411 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1412 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1413 | |
1717
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1414 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1415 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1416 |
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1417 // We have to be careful here as these two calculations can overflow |
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1418 // 32-bit size_t's. |
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1419 double used_after_gc_d = (double) used_after_gc; |
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1420 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1421 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1422 |
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1423 // Let's make sure that they are both under the max heap size, which |
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1424 // by default will make them fit into a size_t. |
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1425 double desired_capacity_upper_bound = (double) max_heap_size; |
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1426 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1427 desired_capacity_upper_bound); |
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1428 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1429 desired_capacity_upper_bound); |
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1430 |
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1431 // We can now safely turn them into size_t's. |
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1432 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1433 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1434 |
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1435 // This assert only makes sense here, before we adjust them |
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1436 // with respect to the min and max heap size. |
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1437 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1438 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1439 "maximum_desired_capacity = "SIZE_FORMAT, |
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1440 minimum_desired_capacity, maximum_desired_capacity)); |
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1441 |
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1442 // Should not be greater than the heap max size. No need to adjust |
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1443 // it with respect to the heap min size as it's a lower bound (i.e., |
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1444 // we'll try to make the capacity larger than it, not smaller). |
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1445 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1446 // Should not be less than the heap min size. No need to adjust it |
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1447 // with respect to the heap max size as it's an upper bound (i.e., |
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1448 // we'll try to make the capacity smaller than it, not greater). |
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1449 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1450 |
1451 if (PrintGC && Verbose) { | |
1717
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1452 const double free_percentage = |
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1453 (double) free_after_gc / (double) capacity_after_gc; |
342 | 1454 gclog_or_tty->print_cr("Computing new size after full GC "); |
1455 gclog_or_tty->print_cr(" " | |
1456 " minimum_free_percentage: %6.2f", | |
1457 minimum_free_percentage); | |
1458 gclog_or_tty->print_cr(" " | |
1459 " maximum_free_percentage: %6.2f", | |
1460 maximum_free_percentage); | |
1461 gclog_or_tty->print_cr(" " | |
1462 " capacity: %6.1fK" | |
1463 " minimum_desired_capacity: %6.1fK" | |
1464 " maximum_desired_capacity: %6.1fK", | |
1717
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1465 (double) capacity_after_gc / (double) K, |
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1466 (double) minimum_desired_capacity / (double) K, |
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1467 (double) maximum_desired_capacity / (double) K); |
342 | 1468 gclog_or_tty->print_cr(" " |
1717
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1469 " free_after_gc: %6.1fK" |
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1470 " used_after_gc: %6.1fK", |
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1471 (double) free_after_gc / (double) K, |
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1472 (double) used_after_gc / (double) K); |
342 | 1473 gclog_or_tty->print_cr(" " |
1474 " free_percentage: %6.2f", | |
1475 free_percentage); | |
1476 } | |
1717
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1477 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1478 // Don't expand unless it's significant |
1479 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1480 if (expand(expand_bytes)) { |
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1481 if (PrintGC && Verbose) { |
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1482 gclog_or_tty->print_cr(" " |
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1483 " expanding:" |
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1484 " max_heap_size: %6.1fK" |
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1485 " minimum_desired_capacity: %6.1fK" |
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1486 " expand_bytes: %6.1fK", |
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1487 (double) max_heap_size / (double) K, |
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1488 (double) minimum_desired_capacity / (double) K, |
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1489 (double) expand_bytes / (double) K); |
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1490 } |
342 | 1491 } |
1492 | |
1493 // No expansion, now see if we want to shrink | |
1717
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1494 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1495 // Capacity too large, compute shrinking size |
1496 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
1497 shrink(shrink_bytes); | |
1498 if (PrintGC && Verbose) { | |
1499 gclog_or_tty->print_cr(" " | |
1500 " shrinking:" | |
1717
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1501 " min_heap_size: %6.1fK" |
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1502 " maximum_desired_capacity: %6.1fK" |
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1503 " shrink_bytes: %6.1fK", |
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1504 (double) min_heap_size / (double) K, |
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1505 (double) maximum_desired_capacity / (double) K, |
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1506 (double) shrink_bytes / (double) K); |
342 | 1507 } |
1508 } | |
1509 } | |
1510 | |
1511 | |
1512 HeapWord* | |
1973 | 1513 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1514 bool* succeeded) { | |
2152 | 1515 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1516 |
1517 *succeeded = true; | |
1518 // Let's attempt the allocation first. | |
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1519 HeapWord* result = |
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1520 attempt_allocation_at_safepoint(word_size, |
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1521 false /* expect_null_mutator_alloc_region */); |
1973 | 1522 if (result != NULL) { |
1523 assert(*succeeded, "sanity"); | |
1524 return result; | |
1525 } | |
342 | 1526 |
1527 // In a G1 heap, we're supposed to keep allocation from failing by | |
1528 // incremental pauses. Therefore, at least for now, we'll favor | |
1529 // expansion over collection. (This might change in the future if we can | |
1530 // do something smarter than full collection to satisfy a failed alloc.) | |
1531 result = expand_and_allocate(word_size); | |
1532 if (result != NULL) { | |
1973 | 1533 assert(*succeeded, "sanity"); |
342 | 1534 return result; |
1535 } | |
1536 | |
1973 | 1537 // Expansion didn't work, we'll try to do a Full GC. |
1538 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1539 false, /* clear_all_soft_refs */ | |
1540 word_size); | |
1541 if (!gc_succeeded) { | |
1542 *succeeded = false; | |
1543 return NULL; | |
1544 } | |
1545 | |
1546 // Retry the allocation | |
1547 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1548 true /* expect_null_mutator_alloc_region */); |
342 | 1549 if (result != NULL) { |
1973 | 1550 assert(*succeeded, "sanity"); |
342 | 1551 return result; |
1552 } | |
1553 | |
1973 | 1554 // Then, try a Full GC that will collect all soft references. |
1555 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1556 true, /* clear_all_soft_refs */ | |
1557 word_size); | |
1558 if (!gc_succeeded) { | |
1559 *succeeded = false; | |
1560 return NULL; | |
1561 } | |
1562 | |
1563 // Retry the allocation once more | |
1564 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1565 true /* expect_null_mutator_alloc_region */); |
342 | 1566 if (result != NULL) { |
1973 | 1567 assert(*succeeded, "sanity"); |
342 | 1568 return result; |
1569 } | |
1570 | |
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1571 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1572 "Flag should have been handled and cleared prior to this point"); |
1387
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1573 |
342 | 1574 // What else? We might try synchronous finalization later. If the total |
1575 // space available is large enough for the allocation, then a more | |
1576 // complete compaction phase than we've tried so far might be | |
1577 // appropriate. | |
1973 | 1578 assert(*succeeded, "sanity"); |
342 | 1579 return NULL; |
1580 } | |
1581 | |
1582 // Attempting to expand the heap sufficiently | |
1583 // to support an allocation of the given "word_size". If | |
1584 // successful, perform the allocation and return the address of the | |
1585 // allocated block, or else "NULL". | |
1586 | |
1587 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1588 assert_at_safepoint(true /* should_be_vm_thread */); |
1589 | |
1590 verify_region_sets_optional(); | |
1973 | 1591 |
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1592 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1593 if (expand(expand_bytes)) { |
3766 | 1594 _hrs.verify_optional(); |
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1595 verify_region_sets_optional(); |
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1596 return attempt_allocation_at_safepoint(word_size, |
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1597 false /* expect_null_mutator_alloc_region */); |
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1598 } |
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1599 return NULL; |
342 | 1600 } |
1601 | |
3766 | 1602 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1603 HeapWord* new_end) { | |
1604 assert(old_end != new_end, "don't call this otherwise"); | |
1605 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1606 | |
1607 // Update the committed mem region. | |
1608 _g1_committed.set_end(new_end); | |
1609 // Tell the card table about the update. | |
1610 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1611 // Tell the BOT about the update. | |
1612 _bot_shared->resize(_g1_committed.word_size()); | |
1613 } | |
1614 | |
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1615 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1616 size_t old_mem_size = _g1_storage.committed_size(); |
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1617 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1618 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1619 HeapRegion::GrainBytes); | |
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1620 |
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1621 if (Verbose && PrintGC) { |
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1622 gclog_or_tty->print("Expanding garbage-first heap from %ldK by %ldK", |
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1623 old_mem_size/K, aligned_expand_bytes/K); |
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1624 } |
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1625 |
3766 | 1626 // First commit the memory. |
1627 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1628 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1629 if (successful) { |
3766 | 1630 // Then propagate this update to the necessary data structures. |
1631 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1632 update_committed_space(old_end, new_end); | |
1633 | |
1634 FreeRegionList expansion_list("Local Expansion List"); | |
1635 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1636 assert(mr.start() == old_end, "post-condition"); | |
1637 // mr might be a smaller region than what was requested if | |
1638 // expand_by() was unable to allocate the HeapRegion instances | |
1639 assert(mr.end() <= new_end, "post-condition"); | |
1640 | |
1641 size_t actual_expand_bytes = mr.byte_size(); | |
1642 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1643 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1644 "post-condition"); | |
1645 if (actual_expand_bytes < aligned_expand_bytes) { | |
1646 // We could not expand _hrs to the desired size. In this case we | |
1647 // need to shrink the committed space accordingly. | |
1648 assert(mr.end() < new_end, "invariant"); | |
1649 | |
1650 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1651 // First uncommit the memory. | |
1652 _g1_storage.shrink_by(diff_bytes); | |
1653 // Then propagate this update to the necessary data structures. | |
1654 update_committed_space(new_end, mr.end()); | |
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1655 } |
3766 | 1656 _free_list.add_as_tail(&expansion_list); |
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1657 } else { |
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1658 // The expansion of the virtual storage space was unsuccessful. |
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1659 // Let's see if it was because we ran out of swap. |
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1660 if (G1ExitOnExpansionFailure && |
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1661 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1662 // We had head room... |
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1663 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1664 } |
1665 } | |
2152 | 1666 |
342 | 1667 if (Verbose && PrintGC) { |
1668 size_t new_mem_size = _g1_storage.committed_size(); | |
2188
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1669 gclog_or_tty->print_cr("...%s, expanded to %ldK", |
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1670 (successful ? "Successful" : "Failed"), |
342 | 1671 new_mem_size/K); |
1672 } | |
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1673 return successful; |
342 | 1674 } |
1675 | |
3766 | 1676 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1677 size_t old_mem_size = _g1_storage.committed_size(); |
1678 size_t aligned_shrink_bytes = | |
1679 ReservedSpace::page_align_size_down(shrink_bytes); | |
1680 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1681 HeapRegion::GrainBytes); | |
1682 size_t num_regions_deleted = 0; | |
3766 | 1683 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1684 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1685 assert(mr.end() == old_end, "post-condition"); | |
1686 if (mr.byte_size() > 0) { | |
342 | 1687 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1688 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1689 assert(mr.start() == new_end, "post-condition"); | |
1690 | |
1691 _expansion_regions += num_regions_deleted; | |
1692 update_committed_space(old_end, new_end); | |
1693 HeapRegionRemSet::shrink_heap(n_regions()); | |
1694 | |
1695 if (Verbose && PrintGC) { | |
1696 size_t new_mem_size = _g1_storage.committed_size(); | |
1697 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
1698 old_mem_size/K, aligned_shrink_bytes/K, | |
1699 new_mem_size/K); | |
1700 } | |
342 | 1701 } |
1702 } | |
1703 | |
1704 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1705 verify_region_sets_optional(); |
1706 | |
636 | 1707 release_gc_alloc_regions(true /* totally */); |
2152 | 1708 // Instead of tearing down / rebuilding the free lists here, we |
1709 // could instead use the remove_all_pending() method on free_list to | |
1710 // remove only the ones that we need to remove. | |
342 | 1711 tear_down_region_lists(); // We will rebuild them in a moment. |
1712 shrink_helper(shrink_bytes); | |
1713 rebuild_region_lists(); | |
2152 | 1714 |
3766 | 1715 _hrs.verify_optional(); |
2152 | 1716 verify_region_sets_optional(); |
342 | 1717 } |
1718 | |
1719 // Public methods. | |
1720 | |
1721 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1722 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1723 #endif // _MSC_VER | |
1724 | |
1725 | |
1726 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1727 SharedHeap(policy_), | |
1728 _g1_policy(policy_), | |
1111 | 1729 _dirty_card_queue_set(false), |
1705 | 1730 _into_cset_dirty_card_queue_set(false), |
2037
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1731 _is_alive_closure(this), |
342 | 1732 _ref_processor(NULL), |
1733 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
1734 _bot_shared(NULL), | |
1735 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1736 _evac_failure_scan_stack(NULL) , | |
1737 _mark_in_progress(false), | |
2152 | 1738 _cg1r(NULL), _summary_bytes_used(0), |
342 | 1739 _refine_cte_cl(NULL), |
1740 _full_collection(false), | |
2152 | 1741 _free_list("Master Free List"), |
1742 _secondary_free_list("Secondary Free List"), | |
1743 _humongous_set("Master Humongous Set"), | |
1744 _free_regions_coming(false), | |
342 | 1745 _young_list(new YoungList(this)), |
1746 _gc_time_stamp(0), | |
526 | 1747 _surviving_young_words(NULL), |
1656
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1748 _full_collections_completed(0), |
526 | 1749 _in_cset_fast_test(NULL), |
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1750 _in_cset_fast_test_base(NULL), |
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1751 _dirty_cards_region_list(NULL) { |
342 | 1752 _g1h = this; // To catch bugs. |
1753 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1754 vm_exit_during_initialization("Failed necessary allocation."); | |
1755 } | |
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1756 |
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1757 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1758 |
342 | 1759 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1760 _task_queues = new RefToScanQueueSet(n_queues); | |
1761 | |
1762 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1763 assert(n_rem_sets > 0, "Invariant."); | |
1764 | |
1765 HeapRegionRemSetIterator** iter_arr = | |
1766 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1767 for (int i = 0; i < n_queues; i++) { | |
1768 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1769 } | |
1770 _rem_set_iterator = iter_arr; | |
1771 | |
1772 for (int i = 0; i < n_queues; i++) { | |
1773 RefToScanQueue* q = new RefToScanQueue(); | |
1774 q->initialize(); | |
1775 _task_queues->register_queue(i, q); | |
1776 } | |
1777 | |
1778 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
636 | 1779 _gc_alloc_regions[ap] = NULL; |
1780 _gc_alloc_region_counts[ap] = 0; | |
1781 _retained_gc_alloc_regions[ap] = NULL; | |
1782 // by default, we do not retain a GC alloc region for each ap; | |
1783 // we'll override this, when appropriate, below | |
1784 _retain_gc_alloc_region[ap] = false; | |
1785 } | |
1786 | |
1787 // We will try to remember the last half-full tenured region we | |
1788 // allocated to at the end of a collection so that we can re-use it | |
1789 // during the next collection. | |
1790 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
1791 | |
342 | 1792 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1793 } | |
1794 | |
1795 jint G1CollectedHeap::initialize() { | |
1166 | 1796 CollectedHeap::pre_initialize(); |
342 | 1797 os::enable_vtime(); |
1798 | |
1799 // Necessary to satisfy locking discipline assertions. | |
1800 | |
1801 MutexLocker x(Heap_lock); | |
1802 | |
1803 // While there are no constraints in the GC code that HeapWordSize | |
1804 // be any particular value, there are multiple other areas in the | |
1805 // system which believe this to be true (e.g. oop->object_size in some | |
1806 // cases incorrectly returns the size in wordSize units rather than | |
1807 // HeapWordSize). | |
1808 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1809 | |
1810 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1811 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1812 | |
1813 // Ensure that the sizes are properly aligned. | |
1814 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1815 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1816 | |
1817 _cg1r = new ConcurrentG1Refine(); | |
1818 | |
1819 // Reserve the maximum. | |
1820 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1821 // Includes the perm-gen. | |
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1822 |
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1823 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1824 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1825 |
342 | 1826 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
1827 HeapRegion::GrainBytes, | |
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1828 UseLargePages, addr); |
642
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1829 |
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1830 if (UseCompressedOops) { |
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1831 if (addr != NULL && !heap_rs.is_reserved()) { |
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1832 // Failed to reserve at specified address - the requested memory |
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1833 // region is taken already, for example, by 'java' launcher. |
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1834 // Try again to reserver heap higher. |
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1835 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1836 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
2135
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1837 UseLargePages, addr); |
642
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1838 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1839 // Failed to reserve at specified address again - give up. |
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1840 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1841 assert(addr == NULL, ""); |
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1842 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1843 UseLargePages, addr); |
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1844 heap_rs = heap_rs1; |
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1845 } else { |
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1846 heap_rs = heap_rs0; |
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1847 } |
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1848 } |
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1849 } |
342 | 1850 |
1851 if (!heap_rs.is_reserved()) { | |
1852 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1853 return JNI_ENOMEM; | |
1854 } | |
1855 | |
1856 // It is important to do this in a way such that concurrent readers can't | |
1857 // temporarily think somethings in the heap. (I've actually seen this | |
1858 // happen in asserts: DLD.) | |
1859 _reserved.set_word_size(0); | |
1860 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1861 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1862 | |
1863 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1864 | |
1865 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1866 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1867 set_barrier_set(rem_set()->bs()); | |
1868 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1869 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1870 } else { | |
1871 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1872 return JNI_ENOMEM; | |
1873 } | |
1874 | |
1875 // Also create a G1 rem set. | |
1861 | 1876 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
1877 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 1878 } else { |
1861 | 1879 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
1880 return JNI_ENOMEM; | |
342 | 1881 } |
1882 | |
1883 // Carve out the G1 part of the heap. | |
1884 | |
1885 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1886 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1887 g1_rs.size()/HeapWordSize); | |
1888 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1889 | |
1890 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1891 | |
1892 _g1_storage.initialize(g1_rs, 0); | |
1893 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 1894 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
1895 (HeapWord*) _g1_reserved.end(), | |
1896 _expansion_regions); | |
342 | 1897 |
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1898 // 6843694 - ensure that the maximum region index can fit |
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1899 // in the remembered set structures. |
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1900 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1901 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1902 |
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1903 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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1904 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1905 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1906 "too many cards per region"); |
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1907 |
2152 | 1908 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
1909 | |
342 | 1910 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
1911 heap_word_size(init_byte_size)); | |
1912 | |
1913 _g1h = this; | |
1914 | |
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1915 _in_cset_fast_test_length = max_regions(); |
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1916 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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1917 |
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1918 // We're biasing _in_cset_fast_test to avoid subtracting the |
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1919 // beginning of the heap every time we want to index; basically |
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1920 // it's the same with what we do with the card table. |
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1921 _in_cset_fast_test = _in_cset_fast_test_base - |
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1922 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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1923 |
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1924 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1925 // regions to the incremental collection set for the first |
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1926 // evacuation pause. |
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1927 clear_cset_fast_test(); |
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1928 |
342 | 1929 // Create the ConcurrentMark data structure and thread. |
1930 // (Must do this late, so that "max_regions" is defined.) | |
1931 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
1932 _cmThread = _cm->cmThread(); | |
1933 | |
1934 // Initialize the from_card cache structure of HeapRegionRemSet. | |
1935 HeapRegionRemSet::init_heap(max_regions()); | |
1936 | |
677 | 1937 // Now expand into the initial heap size. |
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1938 if (!expand(init_byte_size)) { |
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1939 vm_exit_during_initialization("Failed to allocate initial heap."); |
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1940 return JNI_ENOMEM; |
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1941 } |
342 | 1942 |
1943 // Perform any initialization actions delegated to the policy. | |
1944 g1_policy()->init(); | |
1945 | |
1946 g1_policy()->note_start_of_mark_thread(); | |
1947 | |
1948 _refine_cte_cl = | |
1949 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
1950 g1_rem_set(), | |
1951 concurrent_g1_refine()); | |
1952 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
1953 | |
1954 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
1955 SATB_Q_FL_lock, | |
1111 | 1956 G1SATBProcessCompletedThreshold, |
342 | 1957 Shared_SATB_Q_lock); |
794 | 1958 |
1959 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
1960 DirtyCardQ_FL_lock, | |
1111 | 1961 concurrent_g1_refine()->yellow_zone(), |
1962 concurrent_g1_refine()->red_zone(), | |
794 | 1963 Shared_DirtyCardQ_lock); |
1964 | |
616
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1965 if (G1DeferredRSUpdate) { |
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1966 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1967 DirtyCardQ_FL_lock, |
1111 | 1968 -1, // never trigger processing |
1969 -1, // no limit on length | |
616
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1970 Shared_DirtyCardQ_lock, |
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1971 &JavaThread::dirty_card_queue_set()); |
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1972 } |
1705 | 1973 |
1974 // Initialize the card queue set used to hold cards containing | |
1975 // references into the collection set. | |
1976 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
1977 DirtyCardQ_FL_lock, | |
1978 -1, // never trigger processing | |
1979 -1, // no limit on length | |
1980 Shared_DirtyCardQ_lock, | |
1981 &JavaThread::dirty_card_queue_set()); | |
1982 | |
342 | 1983 // In case we're keeping closure specialization stats, initialize those |
1984 // counts and that mechanism. | |
1985 SpecializationStats::clear(); | |
1986 | |
1987 _gc_alloc_region_list = NULL; | |
1988 | |
1989 // Do later initialization work for concurrent refinement. | |
1990 _cg1r->init(); | |
1991 | |
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1992 // Here we allocate the dummy full region that is required by the |
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1993 // G1AllocRegion class. If we don't pass an address in the reserved |
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1994 // space here, lots of asserts fire. |
3766 | 1995 |
1996 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
1997 _g1_reserved.start()); | |
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1998 // We'll re-use the same region whether the alloc region will |
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1999 // require BOT updates or not and, if it doesn't, then a non-young |
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2000 // region will complain that it cannot support allocations without |
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2001 // BOT updates. So we'll tag the dummy region as young to avoid that. |
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2002 dummy_region->set_young(); |
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2003 // Make sure it's full. |
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2004 dummy_region->set_top(dummy_region->end()); |
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2005 G1AllocRegion::setup(this, dummy_region); |
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2006 |
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2007 init_mutator_alloc_region(); |
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2008 |
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2009 // Do create of the monitoring and management support so that |
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2010 // values in the heap have been properly initialized. |
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2011 _g1mm = new G1MonitoringSupport(this, &_g1_storage); |
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2012 |
342 | 2013 return JNI_OK; |
2014 } | |
2015 | |
2016 void G1CollectedHeap::ref_processing_init() { | |
1974
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2017 // Reference processing in G1 currently works as follows: |
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2018 // |
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2019 // * There is only one reference processor instance that |
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2020 // 'spans' the entire heap. It is created by the code |
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2021 // below. |
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2022 // * Reference discovery is not enabled during an incremental |
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2023 // pause (see 6484982). |
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2024 // * Discoverered refs are not enqueued nor are they processed |
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2025 // during an incremental pause (see 6484982). |
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2026 // * Reference discovery is enabled at initial marking. |
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2027 // * Reference discovery is disabled and the discovered |
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2028 // references processed etc during remarking. |
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2029 // * Reference discovery is MT (see below). |
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2030 // * Reference discovery requires a barrier (see below). |
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2031 // * Reference processing is currently not MT (see 6608385). |
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2032 // * A full GC enables (non-MT) reference discovery and |
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2033 // processes any discovered references. |
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|
2034 |
342 | 2035 SharedHeap::ref_processing_init(); |
2036 MemRegion mr = reserved_region(); | |
2369
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|
2037 _ref_processor = |
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|
2038 new ReferenceProcessor(mr, // span |
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2039 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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2040 (int) ParallelGCThreads, // degree of mt processing |
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2041 ParallelGCThreads > 1 || ConcGCThreads > 1, // mt discovery |
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2042 (int) MAX2(ParallelGCThreads, ConcGCThreads), // degree of mt discovery |
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2043 false, // Reference discovery is not atomic |
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|
2044 &_is_alive_closure, // is alive closure for efficiency |
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2045 true); // Setting next fields of discovered |
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2046 // lists requires a barrier. |
342 | 2047 } |
2048 | |
2049 size_t G1CollectedHeap::capacity() const { | |
2050 return _g1_committed.byte_size(); | |
2051 } | |
2052 | |
1705 | 2053 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2054 DirtyCardQueue* into_cset_dcq, | |
2055 bool concurrent, | |
342 | 2056 int worker_i) { |
889 | 2057 // Clean cards in the hot card cache |
1705 | 2058 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2059 |
342 | 2060 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2061 int n_completed_buffers = 0; | |
1705 | 2062 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2063 n_completed_buffers++; |
2064 } | |
2065 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2066 (double) n_completed_buffers); | |
2067 dcqs.clear_n_completed_buffers(); | |
2068 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2069 } | |
2070 | |
2071 | |
2072 // Computes the sum of the storage used by the various regions. | |
2073 | |
2074 size_t G1CollectedHeap::used() const { | |
862
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|
2075 assert(Heap_lock->owner() != NULL, |
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|
2076 "Should be owned on this thread's behalf."); |
342 | 2077 size_t result = _summary_bytes_used; |
845
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|
2078 // Read only once in case it is set to NULL concurrently |
2433
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2079 HeapRegion* hr = _mutator_alloc_region.get(); |
845
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|
2080 if (hr != NULL) |
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|
2081 result += hr->used(); |
342 | 2082 return result; |
2083 } | |
2084 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2085 size_t G1CollectedHeap::used_unlocked() const { |
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|
2086 size_t result = _summary_bytes_used; |
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|
2087 return result; |
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|
2088 } |
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|
2089 |
342 | 2090 class SumUsedClosure: public HeapRegionClosure { |
2091 size_t _used; | |
2092 public: | |
2093 SumUsedClosure() : _used(0) {} | |
2094 bool doHeapRegion(HeapRegion* r) { | |
2095 if (!r->continuesHumongous()) { | |
2096 _used += r->used(); | |
2097 } | |
2098 return false; | |
2099 } | |
2100 size_t result() { return _used; } | |
2101 }; | |
2102 | |
2103 size_t G1CollectedHeap::recalculate_used() const { | |
2104 SumUsedClosure blk; | |
3766 | 2105 heap_region_iterate(&blk); |
342 | 2106 return blk.result(); |
2107 } | |
2108 | |
2109 #ifndef PRODUCT | |
2110 class SumUsedRegionsClosure: public HeapRegionClosure { | |
2111 size_t _num; | |
2112 public: | |
677 | 2113 SumUsedRegionsClosure() : _num(0) {} |
342 | 2114 bool doHeapRegion(HeapRegion* r) { |
2115 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
2116 _num += 1; | |
2117 } | |
2118 return false; | |
2119 } | |
2120 size_t result() { return _num; } | |
2121 }; | |
2122 | |
2123 size_t G1CollectedHeap::recalculate_used_regions() const { | |
2124 SumUsedRegionsClosure blk; | |
3766 | 2125 heap_region_iterate(&blk); |
342 | 2126 return blk.result(); |
2127 } | |
2128 #endif // PRODUCT | |
2129 | |
2130 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2131 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2132 // otherwise, is there space in the current allocation region? |
2133 | |
2134 // We need to store the current allocation region in a local variable | |
2135 // here. The problem is that this method doesn't take any locks and | |
2136 // there may be other threads which overwrite the current allocation | |
2137 // region field. attempt_allocation(), for example, sets it to NULL | |
2138 // and this can happen *after* the NULL check here but before the call | |
2139 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2140 // to be a problem in the optimized build, since the two loads of the | |
2141 // current allocation region field are optimized away. | |
2433
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2142 HeapRegion* hr = _mutator_alloc_region.get(); |
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2143 if (hr == NULL) { |
342 | 2144 return 0; |
2145 } | |
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2146 return hr->free(); |
342 | 2147 } |
2148 | |
1656
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2149 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
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|
2150 return |
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2151 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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2152 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
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|
2153 } |
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|
2154 |
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|
2155 #ifndef PRODUCT |
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2156 void G1CollectedHeap::allocate_dummy_regions() { |
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2157 // Let's fill up most of the region |
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2158 size_t word_size = HeapRegion::GrainWords - 1024; |
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2159 // And as a result the region we'll allocate will be humongous. |
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2160 guarantee(isHumongous(word_size), "sanity"); |
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|
2161 |
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2162 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
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|
2163 // Let's use the existing mechanism for the allocation |
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|
2164 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
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2165 if (dummy_obj != NULL) { |
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2166 MemRegion mr(dummy_obj, word_size); |
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2167 CollectedHeap::fill_with_object(mr); |
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2168 } else { |
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2169 // If we can't allocate once, we probably cannot allocate |
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|
2170 // again. Let's get out of the loop. |
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|
2171 break; |
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|
2172 } |
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2173 } |
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|
2174 } |
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|
2175 #endif // !PRODUCT |
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|
2176 |
2030
fb712ff22571
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|
2177 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
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|
2178 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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|
2179 |
2030
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2180 // We assume that if concurrent == true, then the caller is a |
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2181 // concurrent thread that was joined the Suspendible Thread |
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2182 // Set. If there's ever a cheap way to check this, we should add an |
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|
2183 // assert here. |
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2184 |
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2185 // We have already incremented _total_full_collections at the start |
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2186 // of the GC, so total_full_collections() represents how many full |
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2187 // collections have been started. |
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2188 unsigned int full_collections_started = total_full_collections(); |
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2189 |
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2190 // Given that this method is called at the end of a Full GC or of a |
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2191 // concurrent cycle, and those can be nested (i.e., a Full GC can |
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2192 // interrupt a concurrent cycle), the number of full collections |
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2193 // completed should be either one (in the case where there was no |
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2194 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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2195 // behind the number of full collections started. |
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|
2196 |
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|
2197 // This is the case for the inner caller, i.e. a Full GC. |
2030
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|
2198 assert(concurrent || |
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|
2199 (full_collections_started == _full_collections_completed + 1) || |
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2200 (full_collections_started == _full_collections_completed + 2), |
2030
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2201 err_msg("for inner caller (Full GC): full_collections_started = %u " |
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2202 "is inconsistent with _full_collections_completed = %u", |
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2203 full_collections_started, _full_collections_completed)); |
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2204 |
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2205 // This is the case for the outer caller, i.e. the concurrent cycle. |
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2206 assert(!concurrent || |
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2207 (full_collections_started == _full_collections_completed + 1), |
2030
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2208 err_msg("for outer caller (concurrent cycle): " |
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|
2209 "full_collections_started = %u " |
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2210 "is inconsistent with _full_collections_completed = %u", |
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2211 full_collections_started, _full_collections_completed)); |
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|
2212 |
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2213 _full_collections_completed += 1; |
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|
2214 |
1840
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|
2215 // We need to clear the "in_progress" flag in the CM thread before |
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|
2216 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
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2217 // is set) so that if a waiter requests another System.gc() it doesn't |
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2218 // incorrectly see that a marking cyle is still in progress. |
2030
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2219 if (concurrent) { |
1840
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2220 _cmThread->clear_in_progress(); |
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2221 } |
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|
2222 |
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|
2223 // This notify_all() will ensure that a thread that called |
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2224 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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2225 // and it's waiting for a full GC to finish will be woken up. It is |
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2226 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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|
2227 FullGCCount_lock->notify_all(); |
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|
2228 } |
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2229 |
342 | 2230 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2231 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2232 GCCauseSetter gcs(this, cause); |
2233 switch (cause) { | |
2234 case GCCause::_heap_inspection: | |
2235 case GCCause::_heap_dump: { | |
2236 HandleMark hm; | |
2237 do_full_collection(false); // don't clear all soft refs | |
2238 break; | |
2239 } | |
2240 default: // XXX FIX ME | |
2241 ShouldNotReachHere(); // Unexpected use of this function | |
2242 } | |
2243 } | |
2244 | |
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2245 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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2246 // The caller doesn't have the Heap_lock |
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2247 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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|
2248 |
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|
2249 unsigned int gc_count_before; |
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|
2250 unsigned int full_gc_count_before; |
342 | 2251 { |
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|
2252 MutexLocker ml(Heap_lock); |
1973 | 2253 |
1088
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2254 // Read the GC count while holding the Heap_lock |
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|
2255 gc_count_before = SharedHeap::heap()->total_collections(); |
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2256 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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2257 } |
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|
2258 |
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|
2259 if (should_do_concurrent_full_gc(cause)) { |
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|
2260 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2261 // concurrent cycle. We're setting word_size to 0 which means that |
2262 // we are not requesting a post-GC allocation. | |
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|
2263 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2264 0, /* word_size */ |
2265 true, /* should_initiate_conc_mark */ | |
1656
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|
2266 g1_policy()->max_pause_time_ms(), |
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|
2267 cause); |
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|
2268 VMThread::execute(&op); |
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|
2269 } else { |
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|
2270 if (cause == GCCause::_gc_locker |
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|
2271 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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|
2272 |
1973 | 2273 // Schedule a standard evacuation pause. We're setting word_size |
2274 // to 0 which means that we are not requesting a post-GC allocation. | |
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|
2275 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2276 0, /* word_size */ |
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|
2277 false, /* should_initiate_conc_mark */ |
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|
2278 g1_policy()->max_pause_time_ms(), |
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|
2279 cause); |
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|
2280 VMThread::execute(&op); |
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|
2281 } else { |
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|
2282 // Schedule a Full GC. |
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|
2283 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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|
2284 VMThread::execute(&op); |
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|
2285 } |
342 | 2286 } |
2287 } | |
2288 | |
2289 bool G1CollectedHeap::is_in(const void* p) const { | |
3766 | 2290 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
2291 if (hr != NULL) { | |
342 | 2292 return hr->is_in(p); |
2293 } else { | |
2294 return _perm_gen->as_gen()->is_in(p); | |
2295 } | |
2296 } | |
2297 | |
2298 // Iteration functions. | |
2299 | |
2300 // Iterates an OopClosure over all ref-containing fields of objects | |
2301 // within a HeapRegion. | |
2302 | |
2303 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2304 MemRegion _mr; | |
2305 OopClosure* _cl; | |
2306 public: | |
2307 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2308 : _mr(mr), _cl(cl) {} | |
2309 bool doHeapRegion(HeapRegion* r) { | |
2310 if (! r->continuesHumongous()) { | |
2311 r->oop_iterate(_cl); | |
2312 } | |
2313 return false; | |
2314 } | |
2315 }; | |
2316 | |
678 | 2317 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2318 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2319 heap_region_iterate(&blk); |
678 | 2320 if (do_perm) { |
2321 perm_gen()->oop_iterate(cl); | |
2322 } | |
342 | 2323 } |
2324 | |
678 | 2325 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2326 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2327 heap_region_iterate(&blk); |
678 | 2328 if (do_perm) { |
2329 perm_gen()->oop_iterate(cl); | |
2330 } | |
342 | 2331 } |
2332 | |
2333 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2334 | |
2335 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2336 ObjectClosure* _cl; | |
2337 public: | |
2338 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2339 bool doHeapRegion(HeapRegion* r) { | |
2340 if (! r->continuesHumongous()) { | |
2341 r->object_iterate(_cl); | |
2342 } | |
2343 return false; | |
2344 } | |
2345 }; | |
2346 | |
678 | 2347 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2348 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2349 heap_region_iterate(&blk); |
678 | 2350 if (do_perm) { |
2351 perm_gen()->object_iterate(cl); | |
2352 } | |
342 | 2353 } |
2354 | |
2355 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2356 // FIXME: is this right? | |
2357 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2358 } | |
2359 | |
2360 // Calls a SpaceClosure on a HeapRegion. | |
2361 | |
2362 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2363 SpaceClosure* _cl; | |
2364 public: | |
2365 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2366 bool doHeapRegion(HeapRegion* r) { | |
2367 _cl->do_space(r); | |
2368 return false; | |
2369 } | |
2370 }; | |
2371 | |
2372 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2373 SpaceClosureRegionClosure blk(cl); | |
3766 | 2374 heap_region_iterate(&blk); |
342 | 2375 } |
2376 | |
3766 | 2377 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2378 _hrs.iterate(cl); | |
342 | 2379 } |
2380 | |
2381 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2382 HeapRegionClosure* cl) const { |
2383 _hrs.iterate_from(r, cl); | |
342 | 2384 } |
2385 | |
2386 void | |
2387 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
2388 int worker, | |
2389 jint claim_value) { | |
355 | 2390 const size_t regions = n_regions(); |
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|
2391 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
355 | 2392 // try to spread out the starting points of the workers |
2393 const size_t start_index = regions / worker_num * (size_t) worker; | |
2394 | |
2395 // each worker will actually look at all regions | |
2396 for (size_t count = 0; count < regions; ++count) { | |
2397 const size_t index = (start_index + count) % regions; | |
2398 assert(0 <= index && index < regions, "sanity"); | |
2399 HeapRegion* r = region_at(index); | |
2400 // we'll ignore "continues humongous" regions (we'll process them | |
2401 // when we come across their corresponding "start humongous" | |
2402 // region) and regions already claimed | |
2403 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2404 continue; | |
2405 } | |
2406 // OK, try to claim it | |
342 | 2407 if (r->claimHeapRegion(claim_value)) { |
355 | 2408 // success! |
2409 assert(!r->continuesHumongous(), "sanity"); | |
2410 if (r->startsHumongous()) { | |
2411 // If the region is "starts humongous" we'll iterate over its | |
2412 // "continues humongous" first; in fact we'll do them | |
2413 // first. The order is important. In on case, calling the | |
2414 // closure on the "starts humongous" region might de-allocate | |
2415 // and clear all its "continues humongous" regions and, as a | |
2416 // result, we might end up processing them twice. So, we'll do | |
2417 // them first (notice: most closures will ignore them anyway) and | |
2418 // then we'll do the "starts humongous" region. | |
2419 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2420 HeapRegion* chr = region_at(ch_index); | |
2421 | |
2422 // if the region has already been claimed or it's not | |
2423 // "continues humongous" we're done | |
2424 if (chr->claim_value() == claim_value || | |
2425 !chr->continuesHumongous()) { | |
2426 break; | |
2427 } | |
2428 | |
2429 // Noone should have claimed it directly. We can given | |
2430 // that we claimed its "starts humongous" region. | |
2431 assert(chr->claim_value() != claim_value, "sanity"); | |
2432 assert(chr->humongous_start_region() == r, "sanity"); | |
2433 | |
2434 if (chr->claimHeapRegion(claim_value)) { | |
2435 // we should always be able to claim it; noone else should | |
2436 // be trying to claim this region | |
2437 | |
2438 bool res2 = cl->doHeapRegion(chr); | |
2439 assert(!res2, "Should not abort"); | |
2440 | |
2441 // Right now, this holds (i.e., no closure that actually | |
2442 // does something with "continues humongous" regions | |
2443 // clears them). We might have to weaken it in the future, | |
2444 // but let's leave these two asserts here for extra safety. | |
2445 assert(chr->continuesHumongous(), "should still be the case"); | |
2446 assert(chr->humongous_start_region() == r, "sanity"); | |
2447 } else { | |
2448 guarantee(false, "we should not reach here"); | |
2449 } | |
2450 } | |
2451 } | |
2452 | |
2453 assert(!r->continuesHumongous(), "sanity"); | |
2454 bool res = cl->doHeapRegion(r); | |
2455 assert(!res, "Should not abort"); | |
2456 } | |
2457 } | |
2458 } | |
2459 | |
390 | 2460 class ResetClaimValuesClosure: public HeapRegionClosure { |
2461 public: | |
2462 bool doHeapRegion(HeapRegion* r) { | |
2463 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2464 return false; | |
2465 } | |
2466 }; | |
2467 | |
2468 void | |
2469 G1CollectedHeap::reset_heap_region_claim_values() { | |
2470 ResetClaimValuesClosure blk; | |
2471 heap_region_iterate(&blk); | |
2472 } | |
2473 | |
355 | 2474 #ifdef ASSERT |
2475 // This checks whether all regions in the heap have the correct claim | |
2476 // value. I also piggy-backed on this a check to ensure that the | |
2477 // humongous_start_region() information on "continues humongous" | |
2478 // regions is correct. | |
2479 | |
2480 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2481 private: | |
2482 jint _claim_value; | |
2483 size_t _failures; | |
2484 HeapRegion* _sh_region; | |
2485 public: | |
2486 CheckClaimValuesClosure(jint claim_value) : | |
2487 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2488 bool doHeapRegion(HeapRegion* r) { | |
2489 if (r->claim_value() != _claim_value) { | |
2490 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2491 "claim value = %d, should be %d", | |
2492 r->bottom(), r->end(), r->claim_value(), | |
2493 _claim_value); | |
2494 ++_failures; | |
2495 } | |
2496 if (!r->isHumongous()) { | |
2497 _sh_region = NULL; | |
2498 } else if (r->startsHumongous()) { | |
2499 _sh_region = r; | |
2500 } else if (r->continuesHumongous()) { | |
2501 if (r->humongous_start_region() != _sh_region) { | |
2502 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2503 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2504 r->bottom(), r->end(), | |
2505 r->humongous_start_region(), | |
2506 _sh_region); | |
2507 ++_failures; | |
342 | 2508 } |
2509 } | |
355 | 2510 return false; |
2511 } | |
2512 size_t failures() { | |
2513 return _failures; | |
2514 } | |
2515 }; | |
2516 | |
2517 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2518 CheckClaimValuesClosure cl(claim_value); | |
2519 heap_region_iterate(&cl); | |
2520 return cl.failures() == 0; | |
2521 } | |
2522 #endif // ASSERT | |
342 | 2523 |
2524 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2525 HeapRegion* r = g1_policy()->collection_set(); | |
2526 while (r != NULL) { | |
2527 HeapRegion* next = r->next_in_collection_set(); | |
2528 if (cl->doHeapRegion(r)) { | |
2529 cl->incomplete(); | |
2530 return; | |
2531 } | |
2532 r = next; | |
2533 } | |
2534 } | |
2535 | |
2536 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2537 HeapRegionClosure *cl) { | |
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2538 if (r == NULL) { |
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2539 // The CSet is empty so there's nothing to do. |
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2540 return; |
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2541 } |
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2542 |
342 | 2543 assert(r->in_collection_set(), |
2544 "Start region must be a member of the collection set."); | |
2545 HeapRegion* cur = r; | |
2546 while (cur != NULL) { | |
2547 HeapRegion* next = cur->next_in_collection_set(); | |
2548 if (cl->doHeapRegion(cur) && false) { | |
2549 cl->incomplete(); | |
2550 return; | |
2551 } | |
2552 cur = next; | |
2553 } | |
2554 cur = g1_policy()->collection_set(); | |
2555 while (cur != r) { | |
2556 HeapRegion* next = cur->next_in_collection_set(); | |
2557 if (cl->doHeapRegion(cur) && false) { | |
2558 cl->incomplete(); | |
2559 return; | |
2560 } | |
2561 cur = next; | |
2562 } | |
2563 } | |
2564 | |
2565 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2566 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2567 } |
2568 | |
2569 | |
2570 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2571 Space* res = heap_region_containing(addr); | |
2572 if (res == NULL) | |
2573 res = perm_gen()->space_containing(addr); | |
2574 return res; | |
2575 } | |
2576 | |
2577 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2578 Space* sp = space_containing(addr); | |
2579 if (sp != NULL) { | |
2580 return sp->block_start(addr); | |
2581 } | |
2582 return NULL; | |
2583 } | |
2584 | |
2585 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2586 Space* sp = space_containing(addr); | |
2587 assert(sp != NULL, "block_size of address outside of heap"); | |
2588 return sp->block_size(addr); | |
2589 } | |
2590 | |
2591 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2592 Space* sp = space_containing(addr); | |
2593 return sp->block_is_obj(addr); | |
2594 } | |
2595 | |
2596 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2597 return true; | |
2598 } | |
2599 | |
2600 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2601 return HeapRegion::GrainBytes; | |
2602 } | |
2603 | |
2604 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2605 // Return the remaining space in the cur alloc region, but not less than | |
2606 // the min TLAB size. | |
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2607 |
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2608 // Also, this value can be at most the humongous object threshold, |
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2609 // since we can't allow tlabs to grow big enough to accomodate |
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2610 // humongous objects. |
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2611 |
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2612 HeapRegion* hr = _mutator_alloc_region.get(); |
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2613 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
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2614 if (hr == NULL) { |
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2615 return max_tlab_size; |
342 | 2616 } else { |
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2617 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2618 } |
2619 } | |
2620 | |
2621 size_t G1CollectedHeap::max_capacity() const { | |
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2622 return _g1_reserved.byte_size(); |
342 | 2623 } |
2624 | |
2625 jlong G1CollectedHeap::millis_since_last_gc() { | |
2626 // assert(false, "NYI"); | |
2627 return 0; | |
2628 } | |
2629 | |
2630 void G1CollectedHeap::prepare_for_verify() { | |
2631 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2632 ensure_parsability(false); | |
2633 } | |
2634 g1_rem_set()->prepare_for_verify(); | |
2635 } | |
2636 | |
2637 class VerifyLivenessOopClosure: public OopClosure { | |
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2638 G1CollectedHeap* _g1h; |
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2639 VerifyOption _vo; |
342 | 2640 public: |
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2641 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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2642 _g1h(g1h), _vo(vo) |
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2643 { } |
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2644 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2645 void do_oop( oop *p) { do_oop_work(p); } |
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2646 |
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2647 template <class T> void do_oop_work(T *p) { |
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2648 oop obj = oopDesc::load_decode_heap_oop(p); |
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2649 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
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2650 "Dead object referenced by a not dead object"); |
342 | 2651 } |
2652 }; | |
2653 | |
2654 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2655 private: |
342 | 2656 G1CollectedHeap* _g1h; |
2657 size_t _live_bytes; | |
2658 HeapRegion *_hr; | |
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2659 VerifyOption _vo; |
342 | 2660 public: |
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2661 // _vo == UsePrevMarking -> use "prev" marking information, |
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2662 // _vo == UseNextMarking -> use "next" marking information, |
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2663 // _vo == UseMarkWord -> use mark word from object header. |
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2664 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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2665 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2666 _g1h = G1CollectedHeap::heap(); |
2667 } | |
2668 void do_object(oop o) { | |
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2669 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2670 assert(o != NULL, "Huh?"); |
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2671 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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2672 // If the object is alive according to the mark word, |
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2673 // then verify that the marking information agrees. |
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2674 // Note we can't verify the contra-positive of the |
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2675 // above: if the object is dead (according to the mark |
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2676 // word), it may not be marked, or may have been marked |
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2677 // but has since became dead, or may have been allocated |
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2678 // since the last marking. |
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2679 if (_vo == VerifyOption_G1UseMarkWord) { |
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2680 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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2681 } |
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2682 |
342 | 2683 o->oop_iterate(&isLive); |
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2684 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2685 size_t obj_size = o->size(); // Make sure we don't overflow |
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2686 _live_bytes += (obj_size * HeapWordSize); |
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2687 } |
342 | 2688 } |
2689 } | |
2690 size_t live_bytes() { return _live_bytes; } | |
2691 }; | |
2692 | |
2693 class PrintObjsInRegionClosure : public ObjectClosure { | |
2694 HeapRegion *_hr; | |
2695 G1CollectedHeap *_g1; | |
2696 public: | |
2697 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2698 _g1 = G1CollectedHeap::heap(); | |
2699 }; | |
2700 | |
2701 void do_object(oop o) { | |
2702 if (o != NULL) { | |
2703 HeapWord *start = (HeapWord *) o; | |
2704 size_t word_sz = o->size(); | |
2705 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2706 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2707 (void*) o, word_sz, | |
2708 _g1->isMarkedPrev(o), | |
2709 _g1->isMarkedNext(o), | |
2710 _hr->obj_allocated_since_prev_marking(o)); | |
2711 HeapWord *end = start + word_sz; | |
2712 HeapWord *cur; | |
2713 int *val; | |
2714 for (cur = start; cur < end; cur++) { | |
2715 val = (int *) cur; | |
2716 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2717 } | |
2718 } | |
2719 } | |
2720 }; | |
2721 | |
2722 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2723 private: |
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2724 bool _allow_dirty; |
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2725 bool _par; |
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2726 VerifyOption _vo; |
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2727 bool _failures; |
811 | 2728 public: |
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2729 // _vo == UsePrevMarking -> use "prev" marking information, |
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2730 // _vo == UseNextMarking -> use "next" marking information, |
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2731 // _vo == UseMarkWord -> use mark word from object header. |
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2732 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
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2733 : _allow_dirty(allow_dirty), |
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2734 _par(par), |
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2735 _vo(vo), |
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2736 _failures(false) {} |
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2737 |
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2738 bool failures() { |
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2739 return _failures; |
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2740 } |
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2741 |
342 | 2742 bool doHeapRegion(HeapRegion* r) { |
390 | 2743 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2744 "Should be unclaimed at verify points."); | |
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2745 if (!r->continuesHumongous()) { |
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2746 bool failures = false; |
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2747 r->verify(_allow_dirty, _vo, &failures); |
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2748 if (failures) { |
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2749 _failures = true; |
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2750 } else { |
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2751 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
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2752 r->object_iterate(¬_dead_yet_cl); |
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2753 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2754 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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2755 "max_live_bytes "SIZE_FORMAT" " |
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2756 "< calculated "SIZE_FORMAT, |
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2757 r->bottom(), r->end(), |
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2758 r->max_live_bytes(), |
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2759 not_dead_yet_cl.live_bytes()); |
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2760 _failures = true; |
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2761 } |
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2762 } |
342 | 2763 } |
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2764 return false; // stop the region iteration if we hit a failure |
342 | 2765 } |
2766 }; | |
2767 | |
2768 class VerifyRootsClosure: public OopsInGenClosure { | |
2769 private: | |
2770 G1CollectedHeap* _g1h; | |
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2771 VerifyOption _vo; |
342 | 2772 bool _failures; |
2773 public: | |
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2774 // _vo == UsePrevMarking -> use "prev" marking information, |
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2775 // _vo == UseNextMarking -> use "next" marking information, |
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2776 // _vo == UseMarkWord -> use mark word from object header. |
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2777 VerifyRootsClosure(VerifyOption vo) : |
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2778 _g1h(G1CollectedHeap::heap()), |
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2779 _vo(vo), |
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2780 _failures(false) { } |
342 | 2781 |
2782 bool failures() { return _failures; } | |
2783 | |
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2784 template <class T> void do_oop_nv(T* p) { |
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2785 T heap_oop = oopDesc::load_heap_oop(p); |
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2786 if (!oopDesc::is_null(heap_oop)) { |
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2787 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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2788 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 2789 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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2790 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
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2791 if (_vo == VerifyOption_G1UseMarkWord) { |
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2792 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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2793 } |
342 | 2794 obj->print_on(gclog_or_tty); |
2795 _failures = true; | |
2796 } | |
2797 } | |
2798 } | |
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2799 |
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2800 void do_oop(oop* p) { do_oop_nv(p); } |
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2801 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2802 }; |
2803 | |
390 | 2804 // This is the task used for parallel heap verification. |
2805 | |
2806 class G1ParVerifyTask: public AbstractGangTask { | |
2807 private: | |
2808 G1CollectedHeap* _g1h; | |
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2809 bool _allow_dirty; |
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2810 VerifyOption _vo; |
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|
2811 bool _failures; |
390 | 2812 |
2813 public: | |
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2814 // _vo == UsePrevMarking -> use "prev" marking information, |
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2815 // _vo == UseNextMarking -> use "next" marking information, |
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2816 // _vo == UseMarkWord -> use mark word from object header. |
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2817 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 2818 AbstractGangTask("Parallel verify task"), |
845
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2819 _g1h(g1h), |
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2820 _allow_dirty(allow_dirty), |
3772
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2821 _vo(vo), |
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2822 _failures(false) { } |
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2823 |
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2824 bool failures() { |
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2825 return _failures; |
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|
2826 } |
390 | 2827 |
2828 void work(int worker_i) { | |
637
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|
2829 HandleMark hm; |
3772
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2830 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
390 | 2831 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2832 HeapRegion::ParVerifyClaimValue); | |
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2833 if (blk.failures()) { |
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|
2834 _failures = true; |
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|
2835 } |
390 | 2836 } |
2837 }; | |
2838 | |
342 | 2839 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
3772
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2840 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 2841 } |
2842 | |
2843 void G1CollectedHeap::verify(bool allow_dirty, | |
2844 bool silent, | |
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2845 VerifyOption vo) { |
342 | 2846 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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2847 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
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|
2848 VerifyRootsClosure rootsCl(vo); |
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2849 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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2850 |
3293
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2851 // We apply the relevant closures to all the oops in the |
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|
2852 // system dictionary, the string table and the code cache. |
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|
2853 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
3772
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2854 |
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|
2855 process_strong_roots(true, // activate StrongRootsScope |
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|
2856 true, // we set "collecting perm gen" to true, |
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|
2857 // so we don't reset the dirty cards in the perm gen. |
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|
2858 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 2859 &rootsCl, |
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|
2860 &blobsCl, |
342 | 2861 &rootsCl); |
3772
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|
2862 |
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|
2863 // If we're verifying after the marking phase of a Full GC then we can't |
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|
2864 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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|
2865 // the perm gen may be dead and hence not marked. If one of these dead |
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|
2866 // objects is considered to be a root then we may end up with a false |
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|
2867 // "Root location <x> points to dead ob <y>" failure. |
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|
2868 if (vo != VerifyOption_G1UseMarkWord) { |
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|
2869 // Since we used "collecting_perm_gen" == true above, we will not have |
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|
2870 // checked the refs from perm into the G1-collected heap. We check those |
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|
2871 // references explicitly below. Whether the relevant cards are dirty |
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|
2872 // is checked further below in the rem set verification. |
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|
2873 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
2874 perm_gen()->oop_iterate(&rootsCl); |
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|
2875 } |
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|
2876 bool failures = rootsCl.failures(); |
3772
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|
2877 |
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|
2878 if (vo != VerifyOption_G1UseMarkWord) { |
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|
2879 // If we're verifying during a full GC then the region sets |
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|
2880 // will have been torn down at the start of the GC. Therefore |
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|
2881 // verifying the region sets will fail. So we only verify |
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|
2882 // the region sets when not in a full GC. |
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changeset
|
2883 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
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|
2884 verify_region_sets(); |
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|
2885 } |
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|
2886 |
2152 | 2887 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 2888 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2889 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2890 "sanity check"); | |
2891 | |
3772
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|
2892 G1ParVerifyTask task(this, allow_dirty, vo); |
390 | 2893 int n_workers = workers()->total_workers(); |
2894 set_par_threads(n_workers); | |
2895 workers()->run_task(&task); | |
2896 set_par_threads(0); | |
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|
2897 if (task.failures()) { |
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|
2898 failures = true; |
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|
2899 } |
390 | 2900 |
2901 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2902 "sanity check"); | |
2903 | |
2904 reset_heap_region_claim_values(); | |
2905 | |
2906 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2907 "sanity check"); | |
2908 } else { | |
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|
2909 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 2910 heap_region_iterate(&blk); |
1020
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|
2911 if (blk.failures()) { |
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|
2912 failures = true; |
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|
2913 } |
390 | 2914 } |
2152 | 2915 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 2916 rem_set()->verify(); |
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|
2917 |
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|
2918 if (failures) { |
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|
2919 gclog_or_tty->print_cr("Heap:"); |
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2920 print_on(gclog_or_tty, true /* extended */); |
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2921 gclog_or_tty->print_cr(""); |
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2922 #ifndef PRODUCT |
1044 | 2923 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 2924 concurrent_mark()->print_reachable("at-verification-failure", |
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2925 vo, false /* all */); |
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2926 } |
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2927 #endif |
1020
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2928 gclog_or_tty->flush(); |
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2929 } |
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2930 guarantee(!failures, "there should not have been any failures"); |
342 | 2931 } else { |
2932 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
2933 } | |
2934 } | |
2935 | |
2936 class PrintRegionClosure: public HeapRegionClosure { | |
2937 outputStream* _st; | |
2938 public: | |
2939 PrintRegionClosure(outputStream* st) : _st(st) {} | |
2940 bool doHeapRegion(HeapRegion* r) { | |
2941 r->print_on(_st); | |
2942 return false; | |
2943 } | |
2944 }; | |
2945 | |
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2946 void G1CollectedHeap::print() const { print_on(tty); } |
342 | 2947 |
2948 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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2949 print_on(st, PrintHeapAtGCExtended); |
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2950 } |
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2951 |
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2952 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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2953 st->print(" %-20s", "garbage-first heap"); |
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2954 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
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2955 capacity()/K, used_unlocked()/K); |
838
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2956 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2957 _g1_storage.low_boundary(), |
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2958 _g1_storage.high(), |
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2959 _g1_storage.high_boundary()); |
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2960 st->cr(); |
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2961 st->print(" region size " SIZE_FORMAT "K, ", |
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2962 HeapRegion::GrainBytes/K); |
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2963 size_t young_regions = _young_list->length(); |
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2964 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2965 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2966 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2967 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2968 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2969 st->cr(); |
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2970 perm()->as_gen()->print_on(st); |
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2971 if (extended) { |
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2972 st->cr(); |
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2973 print_on_extended(st); |
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2974 } |
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2975 } |
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2976 |
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2977 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
342 | 2978 PrintRegionClosure blk(st); |
3766 | 2979 heap_region_iterate(&blk); |
342 | 2980 } |
2981 | |
2982 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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2983 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 2984 workers()->print_worker_threads_on(st); |
2985 } | |
2986 _cmThread->print_on(st); | |
342 | 2987 st->cr(); |
1019 | 2988 _cm->print_worker_threads_on(st); |
2989 _cg1r->print_worker_threads_on(st); | |
342 | 2990 st->cr(); |
2991 } | |
2992 | |
2993 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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2994 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2995 workers()->threads_do(tc); |
2996 } | |
2997 tc->do_thread(_cmThread); | |
794 | 2998 _cg1r->threads_do(tc); |
342 | 2999 } |
3000 | |
3001 void G1CollectedHeap::print_tracing_info() const { | |
3002 // We'll overload this to mean "trace GC pause statistics." | |
3003 if (TraceGen0Time || TraceGen1Time) { | |
3004 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3005 // to that. | |
3006 g1_policy()->print_tracing_info(); | |
3007 } | |
751 | 3008 if (G1SummarizeRSetStats) { |
342 | 3009 g1_rem_set()->print_summary_info(); |
3010 } | |
1282 | 3011 if (G1SummarizeConcMark) { |
342 | 3012 concurrent_mark()->print_summary_info(); |
3013 } | |
3014 g1_policy()->print_yg_surv_rate_info(); | |
3015 SpecializationStats::print(); | |
3016 } | |
3017 | |
3018 G1CollectedHeap* G1CollectedHeap::heap() { | |
3019 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3020 "not a garbage-first heap"); | |
3021 return _g1h; | |
3022 } | |
3023 | |
3024 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3025 // always_do_update_barrier = false; |
342 | 3026 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3027 // Call allocation profiler | |
3028 AllocationProfiler::iterate_since_last_gc(); | |
3029 // Fill TLAB's and such | |
3030 ensure_parsability(true); | |
3031 } | |
3032 | |
3033 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3034 // FIXME: what is this about? | |
3035 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3036 // is set. | |
3037 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3038 "derived pointer present")); | |
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3039 // always_do_update_barrier = true; |
342 | 3040 } |
3041 | |
1973 | 3042 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3043 unsigned int gc_count_before, | |
3044 bool* succeeded) { | |
3045 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3046 g1_policy()->record_stop_world_start(); |
1973 | 3047 VM_G1IncCollectionPause op(gc_count_before, |
3048 word_size, | |
3049 false, /* should_initiate_conc_mark */ | |
3050 g1_policy()->max_pause_time_ms(), | |
3051 GCCause::_g1_inc_collection_pause); | |
3052 VMThread::execute(&op); | |
3053 | |
3054 HeapWord* result = op.result(); | |
3055 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3056 assert(result == NULL || ret_succeeded, | |
3057 "the result should be NULL if the VM did not succeed"); | |
3058 *succeeded = ret_succeeded; | |
3059 | |
3060 assert_heap_not_locked(); | |
3061 return result; | |
342 | 3062 } |
3063 | |
3064 void | |
3065 G1CollectedHeap::doConcurrentMark() { | |
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3066 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3067 if (!_cmThread->in_progress()) { |
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3068 _cmThread->set_started(); |
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3069 CGC_lock->notify(); |
342 | 3070 } |
3071 } | |
3072 | |
3073 void G1CollectedHeap::do_sync_mark() { | |
3074 _cm->checkpointRootsInitial(); | |
3075 _cm->markFromRoots(); | |
3076 _cm->checkpointRootsFinal(false); | |
3077 } | |
3078 | |
3079 // <NEW PREDICTION> | |
3080 | |
3081 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3082 bool young) { | |
3083 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3084 } | |
3085 | |
3086 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3087 predicted_time_ms) { | |
3088 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3089 } | |
3090 | |
3091 size_t G1CollectedHeap::pending_card_num() { | |
3092 size_t extra_cards = 0; | |
3093 JavaThread *curr = Threads::first(); | |
3094 while (curr != NULL) { | |
3095 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3096 extra_cards += dcq.size(); | |
3097 curr = curr->next(); | |
3098 } | |
3099 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3100 size_t buffer_size = dcqs.buffer_size(); | |
3101 size_t buffer_num = dcqs.completed_buffers_num(); | |
3102 return buffer_size * buffer_num + extra_cards; | |
3103 } | |
3104 | |
3105 size_t G1CollectedHeap::max_pending_card_num() { | |
3106 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3107 size_t buffer_size = dcqs.buffer_size(); | |
3108 size_t buffer_num = dcqs.completed_buffers_num(); | |
3109 int thread_num = Threads::number_of_threads(); | |
3110 return (buffer_num + thread_num) * buffer_size; | |
3111 } | |
3112 | |
3113 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3114 return g1_rem_set()->cardsScanned(); |
342 | 3115 } |
3116 | |
3117 void | |
3118 G1CollectedHeap::setup_surviving_young_words() { | |
3119 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
3120 size_t array_length = g1_policy()->young_cset_length(); | |
3121 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
3122 if (_surviving_young_words == NULL) { | |
3123 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3124 "Not enough space for young surv words summary."); | |
3125 } | |
3126 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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3127 #ifdef ASSERT |
342 | 3128 for (size_t i = 0; i < array_length; ++i) { |
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3129 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3130 } |
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3131 #endif // !ASSERT |
342 | 3132 } |
3133 | |
3134 void | |
3135 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3136 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3137 size_t array_length = g1_policy()->young_cset_length(); | |
3138 for (size_t i = 0; i < array_length; ++i) | |
3139 _surviving_young_words[i] += surv_young_words[i]; | |
3140 } | |
3141 | |
3142 void | |
3143 G1CollectedHeap::cleanup_surviving_young_words() { | |
3144 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3145 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3146 _surviving_young_words = NULL; | |
3147 } | |
3148 | |
3149 // </NEW PREDICTION> | |
3150 | |
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3151 struct PrepareForRSScanningClosure : public HeapRegionClosure { |
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3152 bool doHeapRegion(HeapRegion *r) { |
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3153 r->rem_set()->set_iter_claimed(0); |
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3154 return false; |
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3155 } |
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3156 }; |
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3157 |
1709 | 3158 #if TASKQUEUE_STATS |
3159 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3160 st->print_raw_cr("GC Task Stats"); | |
3161 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3162 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3163 } | |
3164 | |
3165 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3166 print_taskqueue_stats_hdr(st); | |
3167 | |
3168 TaskQueueStats totals; | |
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3169 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3170 for (int i = 0; i < n; ++i) { |
3171 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3172 totals += task_queue(i)->stats; | |
3173 } | |
3174 st->print_raw("tot "); totals.print(st); st->cr(); | |
3175 | |
3176 DEBUG_ONLY(totals.verify()); | |
3177 } | |
3178 | |
3179 void G1CollectedHeap::reset_taskqueue_stats() { | |
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3180 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3181 for (int i = 0; i < n; ++i) { |
3182 task_queue(i)->stats.reset(); | |
3183 } | |
3184 } | |
3185 #endif // TASKQUEUE_STATS | |
3186 | |
1973 | 3187 bool |
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3188 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3189 assert_at_safepoint(true /* should_be_vm_thread */); |
3190 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3191 | |
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3192 if (GC_locker::check_active_before_gc()) { |
1973 | 3193 return false; |
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3194 } |
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3195 |
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3196 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
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3197 ResourceMark rm; |
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3198 |
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3199 if (PrintHeapAtGC) { |
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3200 Universe::print_heap_before_gc(); |
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|
3201 } |
0316eac49d5a
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|
3202 |
2152 | 3203 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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diff
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|
3204 verify_dirty_young_regions(); |
2152 | 3205 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3206 { |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1313
diff
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|
3207 // 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
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|
3208 // pause. If it is, during_initial_mark_pause() will return true |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1313
diff
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|
3209 // for the duration of this pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1313
diff
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|
3210 g1_policy()->decide_on_conc_mark_initiation(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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|
3211 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3212 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3213 sprintf(verbose_str, "GC pause "); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3214 if (g1_policy()->in_young_gc_mode()) { |
0316eac49d5a
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|
3215 if (g1_policy()->full_young_gcs()) |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3216 strcat(verbose_str, "(young)"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3217 else |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3218 strcat(verbose_str, "(partial)"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3219 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
3220 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3221 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
3222 // We are about to start a marking cycle, so we increment the |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
3223 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
3224 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
3225 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3226 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3227 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
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|
3228 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
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|
3229 // is messy if we do. |
0316eac49d5a
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|
3230 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
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|
3231 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
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|
3232 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
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|
3233 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3234 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3235 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3236 |
2361 | 3237 // If the secondary_free_list is not empty, append it to the |
3238 // free_list. No need to wait for the cleanup operation to finish; | |
3239 // the region allocation code will check the secondary_free_list | |
3240 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3241 // set, skip this step so that the region allocation code has to | |
3242 // get entries from the secondary_free_list. | |
2152 | 3243 if (!G1StressConcRegionFreeing) { |
2361 | 3244 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3245 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3246 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3247 increment_gc_time_stamp(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3248 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3249 if (g1_policy()->in_young_gc_mode()) { |
0316eac49d5a
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|
3250 assert(check_young_list_well_formed(), |
0316eac49d5a
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|
3251 "young list should be well formed"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3252 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3253 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3254 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
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|
3255 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3256 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3257 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
3258 increment_total_collections(false /* full gc */); |
342 | 3259 |
3260 #if G1_REM_SET_LOGGING | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
3261 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
0316eac49d5a
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|
3262 print(); |
342 | 3263 #endif |
3264 | |
838
0316eac49d5a
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|
3265 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
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tonyp
parents:
811
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|
3266 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
|
3267 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3268 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3269 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3270 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3271 /* option */ VerifyOption_G1UsePrevMarking); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3272 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3273 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3274 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3275 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3276 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3277 // Please see comment in G1CollectedHeap::ref_processing_init() |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3278 // to see how reference processing currently works in G1. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3279 // |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3280 // We want to turn off ref discovery, if necessary, and turn it back on |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3281 // on again later if we do. XXX Dubious: why is discovery disabled? |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3282 bool was_enabled = ref_processor()->discovery_enabled(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3283 if (was_enabled) ref_processor()->disable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3284 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3285 // Forget the current alloc region (we might even choose it to be part |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3286 // of the collection set!). |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3287 release_mutator_alloc_region(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3288 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3289 // The elapsed time induced by the start time below deliberately elides |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3290 // the possible verification above. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3291 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3292 size_t start_used_bytes = used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3293 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3294 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3295 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3296 _young_list->print(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3297 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3298 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
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|
3299 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3300 g1_policy()->record_collection_pause_start(start_time_sec, |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3301 start_used_bytes); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3302 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3303 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3304 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3305 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3306 #endif // YOUNG_LIST_VERBOSE |
342 | 3307 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3308 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3309 concurrent_mark()->checkpointRootsInitialPre(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3310 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3311 save_marks(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3312 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3313 // We must do this before any possible evacuation that should propagate |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3314 // marks. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3315 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3316 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3317 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3318 _cm->drainAllSATBBuffers(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3319 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3320 g1_policy()->record_satb_drain_time(finish_mark_ms); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3321 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3322 // Record the number of elements currently on the mark stack, so we |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3323 // only iterate over these. (Since evacuation may add to the mark |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3324 // stack, doing more exposes race conditions.) If no mark is in |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3325 // progress, this will be zero. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3326 _cm->set_oops_do_bound(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3327 |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3328 if (mark_in_progress()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3329 concurrent_mark()->newCSet(); |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3330 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3331 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3332 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3333 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3334 _young_list->print(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3335 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3336 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3337 |
1707 | 3338 g1_policy()->choose_collection_set(target_pause_time_ms); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3339 |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3340 // We have chosen the complete collection set. If marking is |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3341 // active then, we clear the region fields of any of the |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3342 // concurrent marking tasks whose region fields point into |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3343 // the collection set as these values will become stale. This |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3344 // will cause the owning marking threads to claim a new region |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3345 // when marking restarts. |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3346 if (mark_in_progress()) { |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3347 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3348 } |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3349 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3350 // Nothing to do if we were unable to choose a collection set. |
342 | 3351 #if G1_REM_SET_LOGGING |
1707 | 3352 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
3353 print(); | |
342 | 3354 #endif |
1707 | 3355 PrepareForRSScanningClosure prepare_for_rs_scan; |
3356 collection_set_iterate(&prepare_for_rs_scan); | |
3357 | |
3358 setup_surviving_young_words(); | |
3359 | |
3360 // Set up the gc allocation regions. | |
3361 get_gc_alloc_regions(); | |
3362 | |
3363 // Actually do the work... | |
3364 evacuate_collection_set(); | |
3365 | |
3366 free_collection_set(g1_policy()->collection_set()); | |
3367 g1_policy()->clear_collection_set(); | |
3368 | |
3369 cleanup_surviving_young_words(); | |
3370 | |
3371 // Start a new incremental collection set for the next pause. | |
3372 g1_policy()->start_incremental_cset_building(); | |
3373 | |
3374 // Clear the _cset_fast_test bitmap in anticipation of adding | |
3375 // regions to the incremental collection set for the next | |
3376 // evacuation pause. | |
3377 clear_cset_fast_test(); | |
3378 | |
3379 if (g1_policy()->in_young_gc_mode()) { | |
3380 _young_list->reset_sampled_info(); | |
3381 | |
3382 // Don't check the whole heap at this point as the | |
3383 // GC alloc regions from this pause have been tagged | |
3384 // as survivors and moved on to the survivor list. | |
3385 // Survivor regions will fail the !is_young() check. | |
3386 assert(check_young_list_empty(false /* check_heap */), | |
3387 "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
|
3388 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3389 #if YOUNG_LIST_VERBOSE |
1707 | 3390 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
3391 _young_list->print(); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3392 #endif // YOUNG_LIST_VERBOSE |
342 | 3393 |
1707 | 3394 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3395 _young_list->first_survivor_region(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3396 _young_list->last_survivor_region()); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3397 |
1707 | 3398 _young_list->reset_auxilary_lists(); |
342 | 3399 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3400 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3401 if (evacuation_failed()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3402 _summary_bytes_used = recalculate_used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3403 } else { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3404 // The "used" of the the collection set have already been subtracted |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3405 // when they were freed. Add in the bytes evacuated. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3406 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
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 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3409 if (g1_policy()->in_young_gc_mode() && |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3410 g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3411 concurrent_mark()->checkpointRootsInitialPost(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3412 set_marking_started(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3413 // CAUTION: after the doConcurrentMark() call below, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3414 // the concurrent marking thread(s) could be running |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3415 // concurrently with us. Make sure that anything after |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3416 // this point does not assume that we are the only GC thread |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3417 // running. Note: of course, the actual marking work will |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3418 // not start until the safepoint itself is released in |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3419 // ConcurrentGCThread::safepoint_desynchronize(). |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3420 doConcurrentMark(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3421 } |
342 | 3422 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3423 allocate_dummy_regions(); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3424 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3425 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3426 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3427 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3428 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3429 #endif // YOUNG_LIST_VERBOSE |
342 | 3430 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3431 init_mutator_alloc_region(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3432 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3433 double end_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3434 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3435 g1_policy()->record_pause_time_ms(pause_time_ms); |
1707 | 3436 g1_policy()->record_collection_pause_end(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3437 |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3438 MemoryService::track_memory_usage(); |
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3439 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3440 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3441 HandleMark hm; // Discard invalid handles created during verification |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3442 gclog_or_tty->print(" VerifyAfterGC:"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3443 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3444 Universe::verify(/* allow dirty */ true, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3445 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3446 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 3447 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3448 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3449 if (was_enabled) ref_processor()->enable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3450 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3451 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3452 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3453 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3454 size_t bytes_before = capacity(); |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3455 if (!expand(expand_bytes)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3456 // 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
|
3457 // committed/uncommitted amount match the backing store |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3458 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3459 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
|
3460 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3461 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3462 } |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3463 // 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
|
3464 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3465 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3466 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3467 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3468 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3469 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3470 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3471 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3472 #endif |
342 | 3473 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3474 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3475 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3476 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3477 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3478 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
|
3479 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3480 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3481 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3482 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3483 |
3766 | 3484 _hrs.verify_optional(); |
2152 | 3485 verify_region_sets_optional(); |
3486 | |
1709 | 3487 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3488 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3489 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3490 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3491 Universe::print_heap_after_gc(); |
342 | 3492 } |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3493 g1mm()->update_counters(); |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3494 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3495 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3496 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3497 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3498 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3499 } |
1973 | 3500 |
3501 return true; | |
342 | 3502 } |
3503 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3504 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3505 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3506 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3507 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3508 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3509 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3510 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3511 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3512 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3513 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3514 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3515 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3516 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3517 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3518 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3519 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3520 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3521 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3522 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3523 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3524 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3525 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3526 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3527 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3528 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3529 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3530 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3531 |
342 | 3532 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { |
3533 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
636 | 3534 // make sure we don't call set_gc_alloc_region() multiple times on |
3535 // the same region | |
3536 assert(r == NULL || !r->is_gc_alloc_region(), | |
3537 "shouldn't already be a GC alloc region"); | |
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3538 assert(r == NULL || !r->isHumongous(), |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3539 "humongous regions shouldn't be used as GC alloc regions"); |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3540 |
342 | 3541 HeapWord* original_top = NULL; |
3542 if (r != NULL) | |
3543 original_top = r->top(); | |
3544 | |
3545 // We will want to record the used space in r as being there before gc. | |
3546 // One we install it as a GC alloc region it's eligible for allocation. | |
3547 // So record it now and use it later. | |
3548 size_t r_used = 0; | |
3549 if (r != NULL) { | |
3550 r_used = r->used(); | |
3551 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3552 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3553 // need to take the lock to guard against two threads calling |
3554 // get_gc_alloc_region concurrently (very unlikely but...) | |
3555 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3556 r->save_marks(); | |
3557 } | |
3558 } | |
3559 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
3560 _gc_alloc_regions[purpose] = r; | |
3561 if (old_alloc_region != NULL) { | |
3562 // Replace aliases too. | |
3563 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3564 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
3565 _gc_alloc_regions[ap] = r; | |
3566 } | |
3567 } | |
3568 } | |
3569 if (r != NULL) { | |
3570 push_gc_alloc_region(r); | |
3571 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
3572 // We are using a region as a GC alloc region after it has been used | |
3573 // as a mutator allocation region during the current marking cycle. | |
3574 // The mutator-allocated objects are currently implicitly marked, but | |
3575 // when we move hr->next_top_at_mark_start() forward at the the end | |
3576 // of the GC pause, they won't be. We therefore mark all objects in | |
3577 // the "gap". We do this object-by-object, since marking densely | |
3578 // does not currently work right with marking bitmap iteration. This | |
3579 // means we rely on TLAB filling at the start of pauses, and no | |
3580 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
3581 // to fix the marking bitmap iteration. | |
3582 HeapWord* curhw = r->next_top_at_mark_start(); | |
3583 HeapWord* t = original_top; | |
3584 | |
3585 while (curhw < t) { | |
3586 oop cur = (oop)curhw; | |
3587 // We'll assume parallel for generality. This is rare code. | |
3588 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
3589 curhw = curhw + cur->size(); | |
3590 } | |
3591 assert(curhw == t, "Should have parsed correctly."); | |
3592 } | |
3593 if (G1PolicyVerbose > 1) { | |
3594 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
3595 "for survivors:", r->bottom(), original_top, r->end()); | |
3596 r->print(); | |
3597 } | |
3598 g1_policy()->record_before_bytes(r_used); | |
3599 } | |
3600 } | |
3601 | |
3602 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
3603 assert(Thread::current()->is_VM_thread() || | |
2152 | 3604 FreeList_lock->owned_by_self(), "Precondition"); |
342 | 3605 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), |
3606 "Precondition."); | |
3607 hr->set_is_gc_alloc_region(true); | |
3608 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
3609 _gc_alloc_region_list = hr; | |
3610 } | |
3611 | |
3612 #ifdef G1_DEBUG | |
3613 class FindGCAllocRegion: public HeapRegionClosure { | |
3614 public: | |
3615 bool doHeapRegion(HeapRegion* r) { | |
3616 if (r->is_gc_alloc_region()) { | |
3766 | 3617 gclog_or_tty->print_cr("Region "HR_FORMAT" is still a GC alloc region", |
3618 HR_FORMAT_PARAMS(r)); | |
342 | 3619 } |
3620 return false; | |
3621 } | |
3622 }; | |
3623 #endif // G1_DEBUG | |
3624 | |
3625 void G1CollectedHeap::forget_alloc_region_list() { | |
2152 | 3626 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 3627 while (_gc_alloc_region_list != NULL) { |
3628 HeapRegion* r = _gc_alloc_region_list; | |
3629 assert(r->is_gc_alloc_region(), "Invariant."); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3630 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3631 // newly allocated data in order to be able to apply deferred updates |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3632 // before the GC is done for verification purposes (i.e to allow |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3633 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3634 // collection. |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3635 r->ContiguousSpace::set_saved_mark(); |
342 | 3636 _gc_alloc_region_list = r->next_gc_alloc_region(); |
3637 r->set_next_gc_alloc_region(NULL); | |
3638 r->set_is_gc_alloc_region(false); | |
545 | 3639 if (r->is_survivor()) { |
3640 if (r->is_empty()) { | |
3641 r->set_not_young(); | |
3642 } else { | |
3643 _young_list->add_survivor_region(r); | |
3644 } | |
3645 } | |
342 | 3646 } |
3647 #ifdef G1_DEBUG | |
3648 FindGCAllocRegion fa; | |
3649 heap_region_iterate(&fa); | |
3650 #endif // G1_DEBUG | |
3651 } | |
3652 | |
3653 | |
3654 bool G1CollectedHeap::check_gc_alloc_regions() { | |
3655 // TODO: allocation regions check | |
3656 return true; | |
3657 } | |
3658 | |
3659 void G1CollectedHeap::get_gc_alloc_regions() { | |
636 | 3660 // First, let's check that the GC alloc region list is empty (it should) |
3661 assert(_gc_alloc_region_list == NULL, "invariant"); | |
3662 | |
342 | 3663 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
636 | 3664 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3665 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
636 | 3666 |
342 | 3667 // Create new GC alloc regions. |
636 | 3668 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
3669 _retained_gc_alloc_regions[ap] = NULL; | |
3670 | |
3671 if (alloc_region != NULL) { | |
3672 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
3673 | |
3674 // let's make sure that the GC alloc region is not tagged as such | |
3675 // outside a GC operation | |
3676 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
3677 | |
3678 if (alloc_region->in_collection_set() || | |
3679 alloc_region->top() == alloc_region->end() || | |
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3680 alloc_region->top() == alloc_region->bottom() || |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3681 alloc_region->isHumongous()) { |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3682 // we will discard the current GC alloc region if |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3683 // * it's in the collection set (it can happen!), |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3684 // * it's already full (no point in using it), |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3685 // * it's empty (this means that it was emptied during |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3686 // a cleanup and it should be on the free list now), or |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3687 // * it's humongous (this means that it was emptied |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3688 // during a cleanup and was added to the free list, but |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3689 // has been subseqently used to allocate a humongous |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3690 // object that may be less than the region size). |
636 | 3691 |
3692 alloc_region = NULL; | |
3693 } | |
3694 } | |
3695 | |
3696 if (alloc_region == NULL) { | |
3697 // we will get a new GC alloc region | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3698 alloc_region = new_gc_alloc_region(ap, HeapRegion::GrainWords); |
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3699 } else { |
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3700 // the region was retained from the last collection |
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3701 ++_gc_alloc_region_counts[ap]; |
1388 | 3702 if (G1PrintHeapRegions) { |
3766 | 3703 gclog_or_tty->print_cr("new alloc region "HR_FORMAT, |
3704 HR_FORMAT_PARAMS(alloc_region)); | |
1388 | 3705 } |
342 | 3706 } |
636 | 3707 |
342 | 3708 if (alloc_region != NULL) { |
636 | 3709 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
342 | 3710 set_gc_alloc_region(ap, alloc_region); |
3711 } | |
636 | 3712 |
3713 assert(_gc_alloc_regions[ap] == NULL || | |
3714 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
3715 "the GC alloc region should be tagged as such"); | |
3716 assert(_gc_alloc_regions[ap] == NULL || | |
3717 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
3718 "the GC alloc region should be the same as the GC alloc list head"); | |
342 | 3719 } |
3720 // Set alternative regions for allocation purposes that have reached | |
636 | 3721 // their limit. |
342 | 3722 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
3723 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
3724 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
3725 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
3726 } | |
3727 } | |
3728 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3729 } | |
3730 | |
636 | 3731 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
342 | 3732 // We keep a separate list of all regions that have been alloc regions in |
636 | 3733 // the current collection pause. Forget that now. This method will |
3734 // untag the GC alloc regions and tear down the GC alloc region | |
3735 // list. It's desirable that no regions are tagged as GC alloc | |
3736 // outside GCs. | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3737 |
342 | 3738 forget_alloc_region_list(); |
3739 | |
3740 // The current alloc regions contain objs that have survived | |
3741 // collection. Make them no longer GC alloc regions. | |
3742 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3743 HeapRegion* r = _gc_alloc_regions[ap]; | |
636 | 3744 _retained_gc_alloc_regions[ap] = NULL; |
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3745 _gc_alloc_region_counts[ap] = 0; |
636 | 3746 |
3747 if (r != NULL) { | |
3748 // we retain nothing on _gc_alloc_regions between GCs | |
3749 set_gc_alloc_region(ap, NULL); | |
3750 | |
3751 if (r->is_empty()) { | |
2152 | 3752 // We didn't actually allocate anything in it; let's just put |
3753 // it back on the free list. | |
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
3754 _free_list.add_as_head(r); |
636 | 3755 } else if (_retain_gc_alloc_region[ap] && !totally) { |
3756 // retain it so that we can use it at the beginning of the next GC | |
3757 _retained_gc_alloc_regions[ap] = r; | |
342 | 3758 } |
3759 } | |
636 | 3760 } |
3761 } | |
3762 | |
3763 #ifndef PRODUCT | |
3764 // Useful for debugging | |
3765 | |
3766 void G1CollectedHeap::print_gc_alloc_regions() { | |
3767 gclog_or_tty->print_cr("GC alloc regions"); | |
3768 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3769 HeapRegion* r = _gc_alloc_regions[ap]; | |
3770 if (r == NULL) { | |
3771 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
3772 } else { | |
3773 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
3774 ap, r->bottom(), r->used()); | |
3775 } | |
3776 } | |
3777 } | |
3778 #endif // PRODUCT | |
342 | 3779 |
3780 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3781 _drain_in_progress = false; | |
3782 set_evac_failure_closure(cl); | |
3783 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3784 } | |
3785 | |
3786 void G1CollectedHeap::finalize_for_evac_failure() { | |
3787 assert(_evac_failure_scan_stack != NULL && | |
3788 _evac_failure_scan_stack->length() == 0, | |
3789 "Postcondition"); | |
3790 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3791 delete _evac_failure_scan_stack; |
342 | 3792 _evac_failure_scan_stack = NULL; |
3793 } | |
3794 | |
3795 | |
3796 | |
3797 // *** Sequential G1 Evacuation | |
3798 | |
3799 class G1IsAliveClosure: public BoolObjectClosure { | |
3800 G1CollectedHeap* _g1; | |
3801 public: | |
3802 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
3803 void do_object(oop p) { assert(false, "Do not call."); } | |
3804 bool do_object_b(oop p) { | |
3805 // It is reachable if it is outside the collection set, or is inside | |
3806 // and forwarded. | |
3807 | |
3808 #ifdef G1_DEBUG | |
3809 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
3810 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
3811 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
3812 #endif // G1_DEBUG | |
3813 | |
3814 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
3815 } | |
3816 }; | |
3817 | |
3818 class G1KeepAliveClosure: public OopClosure { | |
3819 G1CollectedHeap* _g1; | |
3820 public: | |
3821 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
845
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3822 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3823 void do_oop( oop* p) { |
342 | 3824 oop obj = *p; |
3825 #ifdef G1_DEBUG | |
3826 if (PrintGC && Verbose) { | |
3827 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
3828 p, (void*) obj, (void*) *p); | |
3829 } | |
3830 #endif // G1_DEBUG | |
3831 | |
3832 if (_g1->obj_in_cs(obj)) { | |
3833 assert( obj->is_forwarded(), "invariant" ); | |
3834 *p = obj->forwardee(); | |
3835 #ifdef G1_DEBUG | |
3836 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
3837 (void*) obj, (void*) *p); | |
3838 #endif // G1_DEBUG | |
3839 } | |
3840 } | |
3841 }; | |
3842 | |
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3843 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3844 private: |
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3845 G1CollectedHeap* _g1; |
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3846 DirtyCardQueue *_dcq; |
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3847 CardTableModRefBS* _ct_bs; |
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3848 |
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3849 public: |
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3850 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3851 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3852 |
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3853 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3854 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3855 template <class T> void do_oop_work(T* p) { |
616
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3856 assert(_from->is_in_reserved(p), "paranoia"); |
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3857 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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3858 !_from->is_survivor()) { |
616
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3859 size_t card_index = _ct_bs->index_for(p); |
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3860 if (_ct_bs->mark_card_deferred(card_index)) { |
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3861 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3862 } |
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3863 } |
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3864 } |
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3865 }; |
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3866 |
342 | 3867 class RemoveSelfPointerClosure: public ObjectClosure { |
3868 private: | |
3869 G1CollectedHeap* _g1; | |
3870 ConcurrentMark* _cm; | |
3871 HeapRegion* _hr; | |
3872 size_t _prev_marked_bytes; | |
3873 size_t _next_marked_bytes; | |
616
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3874 OopsInHeapRegionClosure *_cl; |
342 | 3875 public: |
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3876 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
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3877 OopsInHeapRegionClosure* cl) : |
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3878 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
616
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3879 _next_marked_bytes(0), _cl(cl) {} |
342 | 3880 |
3881 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3882 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3883 | |
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3884 // <original comment> |
352
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3885 // The original idea here was to coalesce evacuated and dead objects. |
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3886 // However that caused complications with the block offset table (BOT). |
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3887 // In particular if there were two TLABs, one of them partially refined. |
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3888 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3889 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3890 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3891 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3892 // would point into middle of the filler object. |
2133
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3893 // The current approach is to not coalesce and leave the BOT contents intact. |
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3894 // </original comment> |
352
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3895 // |
2133
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3896 // We now reset the BOT when we start the object iteration over the |
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3897 // region and refine its entries for every object we come across. So |
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3898 // the above comment is not really relevant and we should be able |
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3899 // to coalesce dead objects if we want to. |
352
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3900 void do_object(oop obj) { |
2133
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3901 HeapWord* obj_addr = (HeapWord*) obj; |
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3902 assert(_hr->is_in(obj_addr), "sanity"); |
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3903 size_t obj_size = obj->size(); |
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3904 _hr->update_bot_for_object(obj_addr, obj_size); |
352
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3905 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3906 // The object failed to move. |
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3907 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3908 _cm->markPrev(obj); |
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3909 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3910 _prev_marked_bytes += (obj_size * HeapWordSize); |
352
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3911 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3912 _cm->markAndGrayObjectIfNecessary(obj); |
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3913 } |
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3914 obj->set_mark(markOopDesc::prototype()); |
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3915 // While we were processing RSet buffers during the |
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3916 // collection, we actually didn't scan any cards on the |
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3917 // collection set, since we didn't want to update remebered |
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3918 // sets with entries that point into the collection set, given |
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3919 // that live objects fromthe collection set are about to move |
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3920 // and such entries will be stale very soon. This change also |
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3921 // dealt with a reliability issue which involved scanning a |
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3922 // card in the collection set and coming across an array that |
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3923 // was being chunked and looking malformed. The problem is |
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3924 // that, if evacuation fails, we might have remembered set |
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3925 // entries missing given that we skipped cards on the |
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3926 // collection set. So, we'll recreate such entries now. |
616
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3927 obj->oop_iterate(_cl); |
352
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3928 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3929 } else { |
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3930 // The object has been either evacuated or is dead. Fill it with a |
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3931 // dummy object. |
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3932 MemRegion mr((HeapWord*)obj, obj_size); |
481
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3933 CollectedHeap::fill_with_object(mr); |
342 | 3934 _cm->clearRangeBothMaps(mr); |
3935 } | |
3936 } | |
3937 }; | |
3938 | |
3939 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 3940 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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3941 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3942 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3943 OopsInHeapRegionClosure *cl; |
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3944 if (G1DeferredRSUpdate) { |
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|
3945 cl = &deferred_update; |
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3946 } else { |
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3947 cl = &immediate_update; |
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3948 } |
342 | 3949 HeapRegion* cur = g1_policy()->collection_set(); |
3950 while (cur != NULL) { | |
3951 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
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3952 assert(!cur->isHumongous(), "sanity"); |
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3953 |
342 | 3954 if (cur->evacuation_failed()) { |
3955 assert(cur->in_collection_set(), "bad CS"); | |
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3956 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
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3957 |
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3958 cur->reset_bot(); |
616
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3959 cl->set_region(cur); |
342 | 3960 cur->object_iterate(&rspc); |
3961 | |
3962 // A number of manipulations to make the TAMS be the current top, | |
3963 // and the marked bytes be the ones observed in the iteration. | |
3964 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3965 // The comments below are the postconditions achieved by the | |
3966 // calls. Note especially the last such condition, which says that | |
3967 // the count of marked bytes has been properly restored. | |
3968 cur->note_start_of_marking(false); | |
3969 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3970 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
3971 // _next_marked_bytes == prev_marked_bytes. | |
3972 cur->note_end_of_marking(); | |
3973 // _prev_top_at_mark_start == top(), | |
3974 // _prev_marked_bytes == prev_marked_bytes | |
3975 } | |
3976 // If there is no mark in progress, we modified the _next variables | |
3977 // above needlessly, but harmlessly. | |
3978 if (_g1h->mark_in_progress()) { | |
3979 cur->note_start_of_marking(false); | |
3980 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3981 // _next_marked_bytes == next_marked_bytes. | |
3982 } | |
3983 | |
3984 // Now make sure the region has the right index in the sorted array. | |
3985 g1_policy()->note_change_in_marked_bytes(cur); | |
3986 } | |
3987 cur = cur->next_in_collection_set(); | |
3988 } | |
3989 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3990 | |
3991 // Now restore saved marks, if any. | |
3992 if (_objs_with_preserved_marks != NULL) { | |
3993 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
3994 guarantee(_objs_with_preserved_marks->length() == | |
3995 _preserved_marks_of_objs->length(), "Both or none."); | |
3996 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
3997 oop obj = _objs_with_preserved_marks->at(i); | |
3998 markOop m = _preserved_marks_of_objs->at(i); | |
3999 obj->set_mark(m); | |
4000 } | |
4001 // Delete the preserved marks growable arrays (allocated on the C heap). | |
4002 delete _objs_with_preserved_marks; | |
4003 delete _preserved_marks_of_objs; | |
4004 _objs_with_preserved_marks = NULL; | |
4005 _preserved_marks_of_objs = NULL; | |
4006 } | |
4007 } | |
4008 | |
4009 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4010 _evac_failure_scan_stack->push(obj); | |
4011 } | |
4012 | |
4013 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4014 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4015 | |
4016 while (_evac_failure_scan_stack->length() > 0) { | |
4017 oop obj = _evac_failure_scan_stack->pop(); | |
4018 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4019 obj->oop_iterate_backwards(_evac_failure_closure); | |
4020 } | |
4021 } | |
4022 | |
4023 oop | |
4024 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
4025 oop old) { | |
3323
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4026 assert(obj_in_cs(old), |
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4027 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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4028 (HeapWord*) old)); |
342 | 4029 markOop m = old->mark(); |
4030 oop forward_ptr = old->forward_to_atomic(old); | |
4031 if (forward_ptr == NULL) { | |
4032 // Forward-to-self succeeded. | |
4033 if (_evac_failure_closure != cl) { | |
4034 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4035 assert(!_drain_in_progress, | |
4036 "Should only be true while someone holds the lock."); | |
4037 // Set the global evac-failure closure to the current thread's. | |
4038 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4039 set_evac_failure_closure(cl); | |
4040 // Now do the common part. | |
4041 handle_evacuation_failure_common(old, m); | |
4042 // Reset to NULL. | |
4043 set_evac_failure_closure(NULL); | |
4044 } else { | |
4045 // The lock is already held, and this is recursive. | |
4046 assert(_drain_in_progress, "This should only be the recursive case."); | |
4047 handle_evacuation_failure_common(old, m); | |
4048 } | |
4049 return old; | |
4050 } else { | |
3323
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4051 // Forward-to-self failed. Either someone else managed to allocate |
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4052 // space for this object (old != forward_ptr) or they beat us in |
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4053 // self-forwarding it (old == forward_ptr). |
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4054 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
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4055 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
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4056 "should not be in the CSet", |
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4057 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4058 return forward_ptr; |
4059 } | |
4060 } | |
4061 | |
4062 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4063 set_evacuation_failed(true); | |
4064 | |
4065 preserve_mark_if_necessary(old, m); | |
4066 | |
4067 HeapRegion* r = heap_region_containing(old); | |
4068 if (!r->evacuation_failed()) { | |
4069 r->set_evacuation_failed(true); | |
1282 | 4070 if (G1PrintHeapRegions) { |
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4071 gclog_or_tty->print("overflow in heap region "PTR_FORMAT" " |
342 | 4072 "["PTR_FORMAT","PTR_FORMAT")\n", |
4073 r, r->bottom(), r->end()); | |
4074 } | |
4075 } | |
4076 | |
4077 push_on_evac_failure_scan_stack(old); | |
4078 | |
4079 if (!_drain_in_progress) { | |
4080 // prevent recursion in copy_to_survivor_space() | |
4081 _drain_in_progress = true; | |
4082 drain_evac_failure_scan_stack(); | |
4083 _drain_in_progress = false; | |
4084 } | |
4085 } | |
4086 | |
4087 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
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4088 assert(evacuation_failed(), "Oversaving!"); |
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4089 // We want to call the "for_promotion_failure" version only in the |
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4090 // case of a promotion failure. |
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4091 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4092 if (_objs_with_preserved_marks == NULL) { |
4093 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4094 _objs_with_preserved_marks = | |
4095 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4096 _preserved_marks_of_objs = | |
4097 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4098 } | |
4099 _objs_with_preserved_marks->push(obj); | |
4100 _preserved_marks_of_objs->push(m); | |
4101 } | |
4102 } | |
4103 | |
4104 // *** Parallel G1 Evacuation | |
4105 | |
4106 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4107 size_t word_size) { | |
1718
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4108 assert(!isHumongous(word_size), |
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4109 err_msg("we should not be seeing humongous allocation requests " |
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4110 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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4111 |
342 | 4112 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; |
4113 // let the caller handle alloc failure | |
4114 if (alloc_region == NULL) return NULL; | |
4115 | |
4116 HeapWord* block = alloc_region->par_allocate(word_size); | |
4117 if (block == NULL) { | |
4118 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
4119 } | |
4120 return block; | |
4121 } | |
4122 | |
545 | 4123 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
4124 bool par) { | |
4125 // Another thread might have obtained alloc_region for the given | |
4126 // purpose, and might be attempting to allocate in it, and might | |
4127 // succeed. Therefore, we can't do the "finalization" stuff on the | |
4128 // region below until we're sure the last allocation has happened. | |
4129 // We ensure this by allocating the remaining space with a garbage | |
4130 // object. | |
4131 if (par) par_allocate_remaining_space(alloc_region); | |
4132 // Now we can do the post-GC stuff on the region. | |
4133 alloc_region->note_end_of_copying(); | |
4134 g1_policy()->record_after_bytes(alloc_region->used()); | |
4135 } | |
4136 | |
342 | 4137 HeapWord* |
4138 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
4139 HeapRegion* alloc_region, | |
4140 bool par, | |
4141 size_t word_size) { | |
1718
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4142 assert(!isHumongous(word_size), |
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4143 err_msg("we should not be seeing humongous allocation requests " |
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4144 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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4145 |
2152 | 4146 // We need to make sure we serialize calls to this method. Given |
4147 // that the FreeList_lock guards accesses to the free_list anyway, | |
4148 // and we need to potentially remove a region from it, we'll use it | |
4149 // to protect the whole call. | |
4150 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
4151 | |
342 | 4152 HeapWord* block = NULL; |
4153 // In the parallel case, a previous thread to obtain the lock may have | |
4154 // already assigned a new gc_alloc_region. | |
4155 if (alloc_region != _gc_alloc_regions[purpose]) { | |
4156 assert(par, "But should only happen in parallel case."); | |
4157 alloc_region = _gc_alloc_regions[purpose]; | |
4158 if (alloc_region == NULL) return NULL; | |
4159 block = alloc_region->par_allocate(word_size); | |
4160 if (block != NULL) return block; | |
4161 // Otherwise, continue; this new region is empty, too. | |
4162 } | |
4163 assert(alloc_region != NULL, "We better have an allocation region"); | |
545 | 4164 retire_alloc_region(alloc_region, par); |
342 | 4165 |
4166 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
4167 // Cannot allocate more regions for the given purpose. | |
4168 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
4169 // Is there an alternative? | |
4170 if (purpose != alt_purpose) { | |
4171 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
4172 // Has not the alternative region been aliased? | |
545 | 4173 if (alloc_region != alt_region && alt_region != NULL) { |
342 | 4174 // Try to allocate in the alternative region. |
4175 if (par) { | |
4176 block = alt_region->par_allocate(word_size); | |
4177 } else { | |
4178 block = alt_region->allocate(word_size); | |
4179 } | |
4180 // Make an alias. | |
4181 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
545 | 4182 if (block != NULL) { |
4183 return block; | |
4184 } | |
4185 retire_alloc_region(alt_region, par); | |
342 | 4186 } |
4187 // Both the allocation region and the alternative one are full | |
4188 // and aliased, replace them with a new allocation region. | |
4189 purpose = alt_purpose; | |
4190 } else { | |
4191 set_gc_alloc_region(purpose, NULL); | |
4192 return NULL; | |
4193 } | |
4194 } | |
4195 | |
4196 // Now allocate a new region for allocation. | |
2152 | 4197 alloc_region = new_gc_alloc_region(purpose, word_size); |
342 | 4198 |
4199 // let the caller handle alloc failure | |
4200 if (alloc_region != NULL) { | |
4201 | |
4202 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
4203 assert(alloc_region->saved_mark_at_top(), | |
4204 "Mark should have been saved already."); | |
4205 // This must be done last: once it's installed, other regions may | |
4206 // allocate in it (without holding the lock.) | |
4207 set_gc_alloc_region(purpose, alloc_region); | |
4208 | |
4209 if (par) { | |
4210 block = alloc_region->par_allocate(word_size); | |
4211 } else { | |
4212 block = alloc_region->allocate(word_size); | |
4213 } | |
4214 // Caller handles alloc failure. | |
4215 } else { | |
4216 // This sets other apis using the same old alloc region to NULL, also. | |
4217 set_gc_alloc_region(purpose, NULL); | |
4218 } | |
4219 return block; // May be NULL. | |
4220 } | |
4221 | |
4222 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
4223 HeapWord* block = NULL; | |
4224 size_t free_words; | |
4225 do { | |
4226 free_words = r->free()/HeapWordSize; | |
4227 // If there's too little space, no one can allocate, so we're done. | |
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4228 if (free_words < CollectedHeap::min_fill_size()) return; |
342 | 4229 // Otherwise, try to claim it. |
4230 block = r->par_allocate(free_words); | |
4231 } while (block == NULL); | |
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4232 fill_with_object(block, free_words); |
342 | 4233 } |
4234 | |
4235 #ifndef PRODUCT | |
4236 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4237 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4238 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4239 return true; | |
4240 } | |
4241 #endif // PRODUCT | |
4242 | |
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4243 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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4244 : _g1h(g1h), |
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4245 _refs(g1h->task_queue(queue_num)), |
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4246 _dcq(&g1h->dirty_card_queue_set()), |
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4247 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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4248 _g1_rem(g1h->g1_rem_set()), |
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4249 _hash_seed(17), _queue_num(queue_num), |
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4250 _term_attempts(0), |
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4251 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
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4252 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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4253 _age_table(false), |
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4254 _strong_roots_time(0), _term_time(0), |
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4255 _alloc_buffer_waste(0), _undo_waste(0) |
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4256 { |
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4257 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
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4258 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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4259 // non-young regions (where the age is -1) |
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4260 // We also add a few elements at the beginning and at the end in |
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4261 // an attempt to eliminate cache contention |
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|
4262 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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4263 size_t array_length = PADDING_ELEM_NUM + |
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4264 real_length + |
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4265 PADDING_ELEM_NUM; |
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4266 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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4267 if (_surviving_young_words_base == NULL) |
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4268 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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4269 "Not enough space for young surv histo."); |
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4270 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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4271 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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4272 |
1391
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4273 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4274 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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4275 |
845
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4276 _start = os::elapsedTime(); |
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4277 } |
342 | 4278 |
1709 | 4279 void |
4280 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4281 { | |
4282 st->print_raw_cr("GC Termination Stats"); | |
4283 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4284 " ------waste (KiB)------"); | |
4285 st->print_raw_cr("thr ms ms % ms % attempts" | |
4286 " total alloc undo"); | |
4287 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4288 " ------- ------- -------"); | |
4289 } | |
4290 | |
4291 void | |
4292 G1ParScanThreadState::print_termination_stats(int i, | |
4293 outputStream* const st) const | |
4294 { | |
4295 const double elapsed_ms = elapsed_time() * 1000.0; | |
4296 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4297 const double term_ms = term_time() * 1000.0; | |
4298 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4299 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4300 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4301 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4302 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4303 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4304 alloc_buffer_waste() * HeapWordSize / K, | |
4305 undo_waste() * HeapWordSize / K); | |
4306 } | |
4307 | |
1862
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4308 #ifdef ASSERT |
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4309 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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4310 assert(ref != NULL, "invariant"); |
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4311 assert(UseCompressedOops, "sanity"); |
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4312 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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4313 oop p = oopDesc::load_decode_heap_oop(ref); |
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4314 assert(_g1h->is_in_g1_reserved(p), |
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4315 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4316 return true; |
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4317 } |
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4318 |
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4319 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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4320 assert(ref != NULL, "invariant"); |
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4321 if (has_partial_array_mask(ref)) { |
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4322 // Must be in the collection set--it's already been copied. |
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4323 oop p = clear_partial_array_mask(ref); |
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4324 assert(_g1h->obj_in_cs(p), |
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4325 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4326 } else { |
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4327 oop p = oopDesc::load_decode_heap_oop(ref); |
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4328 assert(_g1h->is_in_g1_reserved(p), |
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4329 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4330 } |
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4331 return true; |
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4332 } |
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4333 |
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4334 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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4335 if (ref.is_narrow()) { |
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4336 return verify_ref((narrowOop*) ref); |
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4337 } else { |
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4338 return verify_ref((oop*) ref); |
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4339 } |
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4340 } |
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4341 #endif // ASSERT |
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4342 |
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4343 void G1ParScanThreadState::trim_queue() { |
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4344 StarTask ref; |
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4345 do { |
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4346 // Drain the overflow stack first, so other threads can steal. |
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4347 while (refs()->pop_overflow(ref)) { |
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4348 deal_with_reference(ref); |
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4349 } |
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4350 while (refs()->pop_local(ref)) { |
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4351 deal_with_reference(ref); |
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4352 } |
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4353 } while (!refs()->is_empty()); |
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4354 } |
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4355 |
342 | 4356 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4357 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
4358 _par_scan_state(par_scan_state) { } | |
4359 | |
845
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4360 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
342 | 4361 // This is called _after_ do_oop_work has been called, hence after |
4362 // the object has been relocated to its new location and *p points | |
4363 // to its new location. | |
4364 | |
845
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4365 T heap_oop = oopDesc::load_heap_oop(p); |
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4366 if (!oopDesc::is_null(heap_oop)) { |
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4367 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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4368 HeapWord* addr = (HeapWord*)obj; |
3323
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4369 if (_g1->is_in_g1_reserved(addr)) { |
342 | 4370 _cm->grayRoot(oop(addr)); |
3323
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4371 } |
342 | 4372 } |
4373 } | |
4374 | |
4375 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
4376 size_t word_sz = old->size(); | |
4377 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4378 // +1 to make the -1 indexes valid... | |
4379 int young_index = from_region->young_index_in_cset()+1; | |
4380 assert( (from_region->is_young() && young_index > 0) || | |
4381 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4382 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4383 markOop m = old->mark(); | |
545 | 4384 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4385 : m->age(); | |
4386 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4387 word_sz); |
4388 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4389 oop obj = oop(obj_ptr); | |
4390 | |
4391 if (obj_ptr == NULL) { | |
4392 // This will either forward-to-self, or detect that someone else has | |
4393 // installed a forwarding pointer. | |
4394 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4395 return _g1->handle_evacuation_failure_par(cl, old); | |
4396 } | |
4397 | |
526 | 4398 // We're going to allocate linearly, so might as well prefetch ahead. |
4399 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4400 | |
342 | 4401 oop forward_ptr = old->forward_to_atomic(obj); |
4402 if (forward_ptr == NULL) { | |
4403 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4404 if (g1p->track_object_age(alloc_purpose)) { |
4405 // We could simply do obj->incr_age(). However, this causes a | |
4406 // performance issue. obj->incr_age() will first check whether | |
4407 // the object has a displaced mark by checking its mark word; | |
4408 // getting the mark word from the new location of the object | |
4409 // stalls. So, given that we already have the mark word and we | |
4410 // are about to install it anyway, it's better to increase the | |
4411 // age on the mark word, when the object does not have a | |
4412 // displaced mark word. We're not expecting many objects to have | |
4413 // a displaced marked word, so that case is not optimized | |
4414 // further (it could be...) and we simply call obj->incr_age(). | |
4415 | |
4416 if (m->has_displaced_mark_helper()) { | |
4417 // in this case, we have to install the mark word first, | |
4418 // otherwise obj looks to be forwarded (the old mark word, | |
4419 // which contains the forward pointer, was copied) | |
4420 obj->set_mark(m); | |
4421 obj->incr_age(); | |
4422 } else { | |
4423 m = m->incr_age(); | |
545 | 4424 obj->set_mark(m); |
526 | 4425 } |
545 | 4426 _par_scan_state->age_table()->add(obj, word_sz); |
4427 } else { | |
4428 obj->set_mark(m); | |
526 | 4429 } |
4430 | |
342 | 4431 // preserve "next" mark bit |
4432 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
4433 if (!use_local_bitmaps || | |
4434 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4435 // if we couldn't mark it on the local bitmap (this happens when | |
4436 // the object was not allocated in the GCLab), we have to bite | |
4437 // the bullet and do the standard parallel mark | |
4438 _cm->markAndGrayObjectIfNecessary(obj); | |
4439 } | |
4440 #if 1 | |
4441 if (_g1->isMarkedNext(old)) { | |
4442 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
4443 } | |
4444 #endif | |
4445 } | |
4446 | |
4447 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4448 surv_young_words[young_index] += word_sz; | |
4449 | |
4450 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4451 arrayOop(old)->set_length(0); | |
845
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4452 oop* old_p = set_partial_array_mask(old); |
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4453 _par_scan_state->push_on_queue(old_p); |
342 | 4454 } else { |
526 | 4455 // No point in using the slower heap_region_containing() method, |
4456 // given that we know obj is in the heap. | |
4457 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4458 obj->oop_iterate_backwards(_scanner); |
4459 } | |
4460 } else { | |
4461 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4462 obj = forward_ptr; | |
4463 } | |
4464 return obj; | |
4465 } | |
4466 | |
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4467 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee> |
845
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4468 template <class T> |
1261
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4469 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee> |
845
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4470 ::do_oop_work(T* p) { |
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4471 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4472 assert(barrier != G1BarrierRS || obj != NULL, |
4473 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4474 | |
526 | 4475 // here the null check is implicit in the cset_fast_test() test |
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4476 if (_g1->in_cset_fast_test(obj)) { |
342 | 4477 #if G1_REM_SET_LOGGING |
526 | 4478 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
4479 "into CS.", p, (void*) obj); | |
342 | 4480 #endif |
526 | 4481 if (obj->is_forwarded()) { |
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4482 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
526 | 4483 } else { |
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4484 oop copy_oop = copy_to_survivor_space(obj); |
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4485 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4486 } |
526 | 4487 // When scanning the RS, we only care about objs in CS. |
4488 if (barrier == G1BarrierRS) { | |
616
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4489 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4490 } |
526 | 4491 } |
4492 | |
4493 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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4494 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4495 } |
4496 | |
4497 if (do_gen_barrier && obj != NULL) { | |
4498 par_do_barrier(p); | |
4499 } | |
4500 } | |
4501 | |
1261
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4502 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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4503 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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4504 |
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4505 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4506 assert(has_partial_array_mask(p), "invariant"); |
4507 oop old = clear_partial_array_mask(p); | |
342 | 4508 assert(old->is_objArray(), "must be obj array"); |
4509 assert(old->is_forwarded(), "must be forwarded"); | |
4510 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4511 | |
4512 objArrayOop obj = objArrayOop(old->forwardee()); | |
4513 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4514 // Process ParGCArrayScanChunk elements now | |
4515 // and push the remainder back onto queue | |
4516 int start = arrayOop(old)->length(); | |
4517 int end = obj->length(); | |
4518 int remainder = end - start; | |
4519 assert(start <= end, "just checking"); | |
4520 if (remainder > 2 * ParGCArrayScanChunk) { | |
4521 // Test above combines last partial chunk with a full chunk | |
4522 end = start + ParGCArrayScanChunk; | |
4523 arrayOop(old)->set_length(end); | |
4524 // Push remainder. | |
845
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4525 oop* old_p = set_partial_array_mask(old); |
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4526 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4527 _par_scan_state->push_on_queue(old_p); |
342 | 4528 } else { |
4529 // Restore length so that the heap remains parsable in | |
4530 // case of evacuation failure. | |
4531 arrayOop(old)->set_length(end); | |
4532 } | |
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4533 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4534 // process our set of indices (include header in first chunk) |
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4535 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4536 } |
4537 | |
4538 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4539 protected: | |
4540 G1CollectedHeap* _g1h; | |
4541 G1ParScanThreadState* _par_scan_state; | |
4542 RefToScanQueueSet* _queues; | |
4543 ParallelTaskTerminator* _terminator; | |
4544 | |
4545 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4546 RefToScanQueueSet* queues() { return _queues; } | |
4547 ParallelTaskTerminator* terminator() { return _terminator; } | |
4548 | |
4549 public: | |
4550 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4551 G1ParScanThreadState* par_scan_state, | |
4552 RefToScanQueueSet* queues, | |
4553 ParallelTaskTerminator* terminator) | |
4554 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4555 _queues(queues), _terminator(terminator) {} | |
4556 | |
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4557 void do_void(); |
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4558 |
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4559 private: |
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4560 inline bool offer_termination(); |
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4561 }; |
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4562 |
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4563 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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4564 G1ParScanThreadState* const pss = par_scan_state(); |
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4565 pss->start_term_time(); |
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4566 const bool res = terminator()->offer_termination(); |
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4567 pss->end_term_time(); |
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4568 return res; |
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|
4569 } |
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4570 |
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4571 void G1ParEvacuateFollowersClosure::do_void() { |
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4572 StarTask stolen_task; |
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4573 G1ParScanThreadState* const pss = par_scan_state(); |
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4574 pss->trim_queue(); |
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|
4575 |
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4576 do { |
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|
4577 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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4578 assert(pss->verify_task(stolen_task), "sanity"); |
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4579 if (stolen_task.is_narrow()) { |
1883
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4580 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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4581 } else { |
1883
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|
4582 pss->deal_with_reference((oop*) stolen_task); |
1862
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4583 } |
1883
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4584 |
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4585 // We've just processed a reference and we might have made |
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4586 // available new entries on the queues. So we have to make sure |
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|
4587 // we drain the queues as necessary. |
342 | 4588 pss->trim_queue(); |
4589 } | |
1862
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4590 } while (!offer_termination()); |
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|
4591 |
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4592 pss->retire_alloc_buffers(); |
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4593 } |
342 | 4594 |
4595 class G1ParTask : public AbstractGangTask { | |
4596 protected: | |
4597 G1CollectedHeap* _g1h; | |
4598 RefToScanQueueSet *_queues; | |
4599 ParallelTaskTerminator _terminator; | |
845
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4600 int _n_workers; |
342 | 4601 |
4602 Mutex _stats_lock; | |
4603 Mutex* stats_lock() { return &_stats_lock; } | |
4604 | |
4605 size_t getNCards() { | |
4606 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4607 / G1BlockOffsetSharedArray::N_bytes; | |
4608 } | |
4609 | |
4610 public: | |
4611 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4612 : AbstractGangTask("G1 collection"), | |
4613 _g1h(g1h), | |
4614 _queues(task_queues), | |
4615 _terminator(workers, _queues), | |
845
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|
4616 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4617 _n_workers(workers) |
342 | 4618 {} |
4619 | |
4620 RefToScanQueueSet* queues() { return _queues; } | |
4621 | |
4622 RefToScanQueue *work_queue(int i) { | |
4623 return queues()->queue(i); | |
4624 } | |
4625 | |
4626 void work(int i) { | |
845
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4627 if (i >= _n_workers) return; // no work needed this round |
1611 | 4628 |
4629 double start_time_ms = os::elapsedTime() * 1000.0; | |
4630 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4631 | |
342 | 4632 ResourceMark rm; |
4633 HandleMark hm; | |
4634 | |
526 | 4635 G1ParScanThreadState pss(_g1h, i); |
4636 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
4637 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
4638 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
342 | 4639 |
4640 pss.set_evac_closure(&scan_evac_cl); | |
4641 pss.set_evac_failure_closure(&evac_failure_cl); | |
4642 pss.set_partial_scan_closure(&partial_scan_cl); | |
4643 | |
4644 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
4645 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
4646 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
1261
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|
4647 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
616
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4648 |
342 | 4649 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
4650 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
4651 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
4652 | |
4653 OopsInHeapRegionClosure *scan_root_cl; | |
4654 OopsInHeapRegionClosure *scan_perm_cl; | |
4655 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
4656 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
342 | 4657 scan_root_cl = &scan_mark_root_cl; |
4658 scan_perm_cl = &scan_mark_perm_cl; | |
4659 } else { | |
4660 scan_root_cl = &only_scan_root_cl; | |
4661 scan_perm_cl = &only_scan_perm_cl; | |
4662 } | |
4663 | |
4664 pss.start_strong_roots(); | |
4665 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4666 SharedHeap::SO_AllClasses, | |
4667 scan_root_cl, | |
1261
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|
4668 &push_heap_rs_cl, |
342 | 4669 scan_perm_cl, |
4670 i); | |
4671 pss.end_strong_roots(); | |
4672 { | |
4673 double start = os::elapsedTime(); | |
4674 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4675 evac.do_void(); | |
4676 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4677 double term_ms = pss.term_time()*1000.0; | |
4678 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4679 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4680 } |
1282 | 4681 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4682 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4683 | |
4684 // Clean up any par-expanded rem sets. | |
4685 HeapRegionRemSet::par_cleanup(); | |
4686 | |
4687 if (ParallelGCVerbose) { | |
1709 | 4688 MutexLocker x(stats_lock()); |
4689 pss.print_termination_stats(i); | |
342 | 4690 } |
4691 | |
1862
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4692 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4693 double end_time_ms = os::elapsedTime() * 1000.0; |
4694 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4695 } |
4696 }; | |
4697 | |
4698 // *** Common G1 Evacuation Stuff | |
4699 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1755
diff
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|
4700 // This method is run in a GC worker. |
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|
4701 |
342 | 4702 void |
4703 G1CollectedHeap:: | |
4704 g1_process_strong_roots(bool collecting_perm_gen, | |
4705 SharedHeap::ScanningOption so, | |
4706 OopClosure* scan_non_heap_roots, | |
4707 OopsInHeapRegionClosure* scan_rs, | |
4708 OopsInGenClosure* scan_perm, | |
4709 int worker_i) { | |
4710 // First scan the strong roots, including the perm gen. | |
4711 double ext_roots_start = os::elapsedTime(); | |
4712 double closure_app_time_sec = 0.0; | |
4713 | |
4714 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4715 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4716 buf_scan_perm.set_generation(perm_gen()); | |
4717 | |
989
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6863023: need non-perm oops in code cache for JSR 292
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|
4718 // Walk the code cache w/o buffering, because StarTask cannot handle |
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6863023: need non-perm oops in code cache for JSR 292
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|
4719 // unaligned oop locations. |
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6863023: need non-perm oops in code cache for JSR 292
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changeset
|
4720 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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|
4721 |
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|
4722 process_strong_roots(false, // no scoping; this is parallel code |
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|
4723 collecting_perm_gen, so, |
342 | 4724 &buf_scan_non_heap_roots, |
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|
4725 &eager_scan_code_roots, |
342 | 4726 &buf_scan_perm); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4727 |
342 | 4728 // Finish up any enqueued closure apps. |
4729 buf_scan_non_heap_roots.done(); | |
4730 buf_scan_perm.done(); | |
4731 double ext_roots_end = os::elapsedTime(); | |
4732 g1_policy()->reset_obj_copy_time(worker_i); | |
4733 double obj_copy_time_sec = | |
4734 buf_scan_non_heap_roots.closure_app_seconds() + | |
4735 buf_scan_perm.closure_app_seconds(); | |
4736 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
4737 double ext_root_time_ms = | |
4738 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
4739 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
4740 | |
4741 // Scan strong roots in mark stack. | |
4742 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4743 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4744 } | |
4745 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4746 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4747 | |
4748 // XXX What should this be doing in the parallel case? | |
4749 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
4750 // Now scan the complement of the collection set. | |
4751 if (scan_rs != NULL) { | |
4752 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4753 } | |
4754 // Finish with the ref_processor roots. | |
4755 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
changeset
|
4756 // We need to treat the discovered reference lists as roots and |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
changeset
|
4757 // keep entries (which are added by the marking threads) on them |
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4758 // live until they can be processed at the end of marking. |
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4759 ref_processor()->weak_oops_do(scan_non_heap_roots); |
342 | 4760 ref_processor()->oops_do(scan_non_heap_roots); |
4761 } | |
4762 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
4763 _process_strong_tasks->all_tasks_completed(); | |
4764 } | |
4765 | |
4766 void | |
4767 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4768 OopClosure* non_root_closure) { | |
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4769 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4770 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4771 } |
4772 | |
4773 | |
4774 class SaveMarksClosure: public HeapRegionClosure { | |
4775 public: | |
4776 bool doHeapRegion(HeapRegion* r) { | |
4777 r->save_marks(); | |
4778 return false; | |
4779 } | |
4780 }; | |
4781 | |
4782 void G1CollectedHeap::save_marks() { | |
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4783 if (!CollectedHeap::use_parallel_gc_threads()) { |
342 | 4784 SaveMarksClosure sm; |
4785 heap_region_iterate(&sm); | |
4786 } | |
4787 // We do this even in the parallel case | |
4788 perm_gen()->save_marks(); | |
4789 } | |
4790 | |
4791 void G1CollectedHeap::evacuate_collection_set() { | |
4792 set_evacuation_failed(false); | |
4793 | |
4794 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
4795 concurrent_g1_refine()->set_use_cache(false); | |
889 | 4796 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
4797 | |
342 | 4798 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
4799 set_par_threads(n_workers); | |
4800 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
4801 | |
4802 init_for_evac_failure(NULL); | |
4803 | |
4804 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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4805 |
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4806 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 4807 double start_par = os::elapsedTime(); |
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4808 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4809 // The individual threads will set their evac-failure closures. |
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4810 StrongRootsScope srs(this); |
1709 | 4811 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
342 | 4812 workers()->run_task(&g1_par_task); |
4813 } else { | |
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4814 StrongRootsScope srs(this); |
342 | 4815 g1_par_task.work(0); |
4816 } | |
4817 | |
4818 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
4819 g1_policy()->record_par_time(par_time); | |
4820 set_par_threads(0); | |
4821 // Is this the right thing to do here? We don't save marks | |
4822 // on individual heap regions when we allocate from | |
4823 // them in parallel, so this seems like the correct place for this. | |
545 | 4824 retire_all_alloc_regions(); |
1974
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4825 |
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4826 // Weak root processing. |
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4827 // Note: when JSR 292 is enabled and code blobs can contain |
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4828 // non-perm oops then we will need to process the code blobs |
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4829 // here too. |
342 | 4830 { |
4831 G1IsAliveClosure is_alive(this); | |
4832 G1KeepAliveClosure keep_alive(this); | |
4833 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
4834 } | |
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4835 release_gc_alloc_regions(false /* totally */); |
342 | 4836 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
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4837 |
889 | 4838 concurrent_g1_refine()->clear_hot_cache(); |
342 | 4839 concurrent_g1_refine()->set_use_cache(true); |
4840 | |
4841 finalize_for_evac_failure(); | |
4842 | |
4843 // Must do this before removing self-forwarding pointers, which clears | |
4844 // the per-region evac-failure flags. | |
4845 concurrent_mark()->complete_marking_in_collection_set(); | |
4846 | |
4847 if (evacuation_failed()) { | |
4848 remove_self_forwarding_pointers(); | |
4849 if (PrintGCDetails) { | |
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|
4850 gclog_or_tty->print(" (to-space overflow)"); |
342 | 4851 } else if (PrintGC) { |
4852 gclog_or_tty->print("--"); | |
4853 } | |
4854 } | |
4855 | |
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4856 if (G1DeferredRSUpdate) { |
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4857 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4858 dirty_card_queue_set().set_closure(&redirty); |
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4859 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 4860 |
4861 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
4862 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
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4863 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4864 } |
342 | 4865 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
4866 } | |
4867 | |
2173 | 4868 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 4869 size_t* pre_used, |
4870 FreeRegionList* free_list, | |
4871 HumongousRegionSet* humongous_proxy_set, | |
2173 | 4872 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 4873 bool par) { |
4874 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
4875 if (hr->isHumongous()) { | |
4876 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
4877 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
4878 } else { | |
4879 free_region(hr, pre_used, free_list, par); | |
342 | 4880 } |
2173 | 4881 } else { |
4882 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 4883 } |
4884 } | |
4885 | |
2152 | 4886 void G1CollectedHeap::free_region(HeapRegion* hr, |
4887 size_t* pre_used, | |
4888 FreeRegionList* free_list, | |
4889 bool par) { | |
4890 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
4891 assert(!hr->is_empty(), "the region should not be empty"); | |
4892 assert(free_list != NULL, "pre-condition"); | |
4893 | |
4894 *pre_used += hr->used(); | |
4895 hr->hr_clear(par, true /* clear_space */); | |
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4896 free_list->add_as_head(hr); |
2152 | 4897 } |
4898 | |
4899 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
4900 size_t* pre_used, | |
4901 FreeRegionList* free_list, | |
4902 HumongousRegionSet* humongous_proxy_set, | |
4903 bool par) { | |
4904 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
4905 assert(free_list != NULL, "pre-condition"); | |
4906 assert(humongous_proxy_set != NULL, "pre-condition"); | |
4907 | |
4908 size_t hr_used = hr->used(); | |
4909 size_t hr_capacity = hr->capacity(); | |
4910 size_t hr_pre_used = 0; | |
4911 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
4912 hr->set_notHumongous(); | |
4913 free_region(hr, &hr_pre_used, free_list, par); | |
4914 | |
3766 | 4915 size_t i = hr->hrs_index() + 1; |
2152 | 4916 size_t num = 1; |
3766 | 4917 while (i < n_regions()) { |
4918 HeapRegion* curr_hr = region_at(i); | |
2152 | 4919 if (!curr_hr->continuesHumongous()) { |
4920 break; | |
4921 } | |
4922 curr_hr->set_notHumongous(); | |
4923 free_region(curr_hr, &hr_pre_used, free_list, par); | |
4924 num += 1; | |
4925 i += 1; | |
4926 } | |
4927 assert(hr_pre_used == hr_used, | |
4928 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
4929 "should be the same", hr_pre_used, hr_used)); | |
4930 *pre_used += hr_pre_used; | |
4931 } | |
4932 | |
4933 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
4934 FreeRegionList* free_list, | |
4935 HumongousRegionSet* humongous_proxy_set, | |
4936 bool par) { | |
4937 if (pre_used > 0) { | |
4938 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 4939 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 4940 assert(_summary_bytes_used >= pre_used, |
4941 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
4942 "should be >= pre_used: "SIZE_FORMAT, | |
4943 _summary_bytes_used, pre_used)); | |
342 | 4944 _summary_bytes_used -= pre_used; |
2152 | 4945 } |
4946 if (free_list != NULL && !free_list->is_empty()) { | |
4947 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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4948 _free_list.add_as_head(free_list); |
2152 | 4949 } |
4950 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { | |
4951 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
4952 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 4953 } |
4954 } | |
4955 | |
4956 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
4957 while (list != NULL) { | |
4958 guarantee( list->is_young(), "invariant" ); | |
4959 | |
4960 HeapWord* bottom = list->bottom(); | |
4961 HeapWord* end = list->end(); | |
4962 MemRegion mr(bottom, end); | |
4963 ct_bs->dirty(mr); | |
4964 | |
4965 list = list->get_next_young_region(); | |
4966 } | |
4967 } | |
4968 | |
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4969 |
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4970 class G1ParCleanupCTTask : public AbstractGangTask { |
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4971 CardTableModRefBS* _ct_bs; |
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4972 G1CollectedHeap* _g1h; |
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4973 HeapRegion* volatile _su_head; |
796
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4974 public: |
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4975 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
940
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4976 G1CollectedHeap* g1h, |
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4977 HeapRegion* survivor_list) : |
796
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4978 AbstractGangTask("G1 Par Cleanup CT Task"), |
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4979 _ct_bs(ct_bs), |
940
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6841313: G1: dirty cards of survivor regions in parallel
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4980 _g1h(g1h), |
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4981 _su_head(survivor_list) |
796
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4982 { } |
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|
4983 |
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4984 void work(int i) { |
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4985 HeapRegion* r; |
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4986 while (r = _g1h->pop_dirty_cards_region()) { |
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4987 clear_cards(r); |
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4988 } |
1394
1316cec51b4d
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4989 // Redirty the cards of the survivor regions. |
940
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|
4990 dirty_list(&this->_su_head); |
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4991 } |
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4992 |
796
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4993 void clear_cards(HeapRegion* r) { |
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4994 // Cards for Survivor regions will be dirtied later. |
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4995 if (!r->is_survivor()) { |
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4996 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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4997 } |
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4998 } |
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4999 |
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5000 void dirty_list(HeapRegion* volatile * head_ptr) { |
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5001 HeapRegion* head; |
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5002 do { |
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5003 // Pop region off the list. |
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5004 head = *head_ptr; |
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5005 if (head != NULL) { |
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5006 HeapRegion* r = (HeapRegion*) |
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5007 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
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5008 if (r == head) { |
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5009 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
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5010 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
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5011 } |
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5012 } |
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5013 } while (*head_ptr != NULL); |
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5014 } |
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5015 }; |
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5016 |
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5017 |
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5018 #ifndef PRODUCT |
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5019 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5020 G1CollectedHeap* _g1h; |
940
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|
5021 CardTableModRefBS* _ct_bs; |
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|
5022 public: |
3317
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|
5023 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
063382f9b575
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|
5024 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
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tonyp
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|
5025 virtual bool doHeapRegion(HeapRegion* r) { |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5026 if (r->is_survivor()) { |
3317
063382f9b575
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|
5027 _g1h->verify_dirty_region(r); |
940
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|
5028 } else { |
3317
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|
5029 _g1h->verify_not_dirty_region(r); |
940
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|
5030 } |
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|
5031 return false; |
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|
5032 } |
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|
5033 }; |
2433
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|
5034 |
3317
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|
5035 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
063382f9b575
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|
5036 // All of the region should be clean. |
063382f9b575
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|
5037 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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|
5038 MemRegion mr(hr->bottom(), hr->end()); |
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|
5039 ct_bs->verify_not_dirty_region(mr); |
063382f9b575
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|
5040 } |
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|
5041 |
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|
5042 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
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|
5043 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
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|
5044 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
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|
5045 // retires each region and replaces it with a new one will do a |
063382f9b575
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|
5046 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
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|
5047 // not dirty that area (one less thing to have to do while holding |
063382f9b575
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|
5048 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
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|
5049 // is dirty. |
063382f9b575
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|
5050 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
063382f9b575
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|
5051 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
063382f9b575
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|
5052 ct_bs->verify_dirty_region(mr); |
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|
5053 } |
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|
5054 |
2433
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|
5055 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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|
5056 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
2433
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|
5057 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
063382f9b575
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|
5058 verify_dirty_region(hr); |
2433
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|
5059 } |
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|
5060 } |
abdfc822206f
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|
5061 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5062 void G1CollectedHeap::verify_dirty_young_regions() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5063 verify_dirty_young_list(_young_list->first_region()); |
abdfc822206f
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|
5064 verify_dirty_young_list(_young_list->first_survivor_region()); |
abdfc822206f
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parents:
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|
5065 } |
940
8624da129f0b
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apetrusenko
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|
5066 #endif |
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|
5067 |
342 | 5068 void G1CollectedHeap::cleanUpCardTable() { |
5069 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5070 double start = os::elapsedTime(); | |
5071 | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5072 // Iterate over the dirty cards region list. |
940
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apetrusenko
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diff
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|
5073 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
8624da129f0b
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|
5074 _young_list->first_survivor_region()); |
1394
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parents:
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|
5075 |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
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|
5076 if (ParallelGCThreads > 0) { |
29e7d79232b9
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apetrusenko
parents:
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diff
changeset
|
5077 set_par_threads(workers()->total_workers()); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
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diff
changeset
|
5078 workers()->run_task(&cleanup_task); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5079 set_par_threads(0); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5080 } else { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5081 while (_dirty_cards_region_list) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5082 HeapRegion* r = _dirty_cards_region_list; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5083 cleanup_task.clear_cards(r); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
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diff
changeset
|
5084 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5085 if (_dirty_cards_region_list == r) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5086 // The last region. |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
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diff
changeset
|
5087 _dirty_cards_region_list = NULL; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5088 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5089 r->set_next_dirty_cards_region(NULL); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5090 } |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5091 // now, redirty the cards of the survivor regions |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5092 // (it seemed faster to do it this way, instead of iterating over |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5093 // all regions and then clearing / dirtying as appropriate) |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5094 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
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|
5095 } |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5096 |
342 | 5097 double elapsed = os::elapsedTime() - start; |
5098 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
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|
5099 #ifndef PRODUCT |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5100 if (G1VerifyCTCleanup || VerifyAfterGC) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
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|
5101 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
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|
5102 heap_region_iterate(&cleanup_verifier); |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5103 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5104 #endif |
342 | 5105 } |
5106 | |
5107 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5108 size_t pre_used = 0; |
5109 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5110 | |
342 | 5111 double young_time_ms = 0.0; |
5112 double non_young_time_ms = 0.0; | |
5113 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5114 // Since the collection set is a superset of the the young list, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
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|
5115 // all we need to do to clear the young list is clear its |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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diff
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|
5116 // head and length, and unlink any young regions in the code below |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5117 _young_list->clear(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5118 |
342 | 5119 G1CollectorPolicy* policy = g1_policy(); |
5120 | |
5121 double start_sec = os::elapsedTime(); | |
5122 bool non_young = true; | |
5123 | |
5124 HeapRegion* cur = cs_head; | |
5125 int age_bound = -1; | |
5126 size_t rs_lengths = 0; | |
5127 | |
5128 while (cur != NULL) { | |
2361 | 5129 assert(!is_on_master_free_list(cur), "sanity"); |
2152 | 5130 |
342 | 5131 if (non_young) { |
5132 if (cur->is_young()) { | |
5133 double end_sec = os::elapsedTime(); | |
5134 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5135 non_young_time_ms += elapsed_ms; | |
5136 | |
5137 start_sec = os::elapsedTime(); | |
5138 non_young = false; | |
5139 } | |
5140 } else { | |
2152 | 5141 double end_sec = os::elapsedTime(); |
5142 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5143 young_time_ms += elapsed_ms; | |
5144 | |
5145 start_sec = os::elapsedTime(); | |
5146 non_young = true; | |
342 | 5147 } |
5148 | |
5149 rs_lengths += cur->rem_set()->occupied(); | |
5150 | |
5151 HeapRegion* next = cur->next_in_collection_set(); | |
5152 assert(cur->in_collection_set(), "bad CS"); | |
5153 cur->set_next_in_collection_set(NULL); | |
5154 cur->set_in_collection_set(false); | |
5155 | |
5156 if (cur->is_young()) { | |
5157 int index = cur->young_index_in_cset(); | |
5158 guarantee( index != -1, "invariant" ); | |
5159 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
5160 size_t words_survived = _surviving_young_words[index]; | |
5161 cur->record_surv_words_in_group(words_survived); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5162 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
5163 // At this point the we have 'popped' cur from the collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5164 // (linked via next_in_collection_set()) but it is still in the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5165 // young list (linked via next_young_region()). Clear the |
1316cec51b4d
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diff
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|
5166 // _next_young_region field. |
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diff
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|
5167 cur->set_next_young_region(NULL); |
342 | 5168 } else { |
5169 int index = cur->young_index_in_cset(); | |
5170 guarantee( index == -1, "invariant" ); | |
5171 } | |
5172 | |
5173 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5174 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5175 "invariant" ); | |
5176 | |
5177 if (!cur->evacuation_failed()) { | |
5178 // And the region is empty. | |
2152 | 5179 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
5180 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
342 | 5181 } else { |
5182 cur->uninstall_surv_rate_group(); | |
5183 if (cur->is_young()) | |
5184 cur->set_young_index_in_cset(-1); | |
5185 cur->set_not_young(); | |
5186 cur->set_evacuation_failed(false); | |
5187 } | |
5188 cur = next; | |
5189 } | |
5190 | |
5191 policy->record_max_rs_lengths(rs_lengths); | |
5192 policy->cset_regions_freed(); | |
5193 | |
5194 double end_sec = os::elapsedTime(); | |
5195 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5196 if (non_young) | |
5197 non_young_time_ms += elapsed_ms; | |
5198 else | |
5199 young_time_ms += elapsed_ms; | |
5200 | |
2152 | 5201 update_sets_after_freeing_regions(pre_used, &local_free_list, |
5202 NULL /* humongous_proxy_set */, | |
5203 false /* par */); | |
342 | 5204 policy->record_young_free_cset_time_ms(young_time_ms); |
5205 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5206 } | |
5207 | |
1394
1316cec51b4d
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|
5208 // This routine is similar to the above but does not record |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
5209 // any policy statistics or update free lists; we are abandoning |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
5210 // the current incremental collection set in preparation of a |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5211 // full collection. After the full GC we will start to build up |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5212 // the incremental collection set again. |
1316cec51b4d
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5213 // This is only called when we're doing a full collection |
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5214 // and is immediately followed by the tearing down of the young list. |
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5215 |
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5216 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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5217 HeapRegion* cur = cs_head; |
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5218 |
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5219 while (cur != NULL) { |
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5220 HeapRegion* next = cur->next_in_collection_set(); |
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5221 assert(cur->in_collection_set(), "bad CS"); |
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5222 cur->set_next_in_collection_set(NULL); |
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5223 cur->set_in_collection_set(false); |
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5224 cur->set_young_index_in_cset(-1); |
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5225 cur = next; |
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5226 } |
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5227 } |
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5228 |
2152 | 5229 void G1CollectedHeap::set_free_regions_coming() { |
5230 if (G1ConcRegionFreeingVerbose) { | |
5231 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5232 "setting free regions coming"); | |
5233 } | |
5234 | |
5235 assert(!free_regions_coming(), "pre-condition"); | |
5236 _free_regions_coming = true; | |
342 | 5237 } |
5238 | |
2152 | 5239 void G1CollectedHeap::reset_free_regions_coming() { |
5240 { | |
5241 assert(free_regions_coming(), "pre-condition"); | |
5242 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5243 _free_regions_coming = false; | |
5244 SecondaryFreeList_lock->notify_all(); | |
5245 } | |
5246 | |
5247 if (G1ConcRegionFreeingVerbose) { | |
5248 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5249 "reset free regions coming"); | |
342 | 5250 } |
5251 } | |
5252 | |
2152 | 5253 void G1CollectedHeap::wait_while_free_regions_coming() { |
5254 // Most of the time we won't have to wait, so let's do a quick test | |
5255 // first before we take the lock. | |
5256 if (!free_regions_coming()) { | |
5257 return; | |
5258 } | |
5259 | |
5260 if (G1ConcRegionFreeingVerbose) { | |
5261 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5262 "waiting for free regions"); | |
342 | 5263 } |
5264 | |
5265 { | |
2152 | 5266 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5267 while (free_regions_coming()) { | |
5268 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5269 } |
2152 | 5270 } |
5271 | |
5272 if (G1ConcRegionFreeingVerbose) { | |
5273 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5274 "done waiting for free regions"); | |
5275 } | |
342 | 5276 } |
5277 | |
5278 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5279 assert(heap_lock_held_for_gc(), | |
5280 "the heap lock should already be held by or for this thread"); | |
5281 _young_list->push_region(hr); | |
5282 g1_policy()->set_region_short_lived(hr); | |
5283 } | |
5284 | |
5285 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5286 private: | |
5287 bool _success; | |
5288 public: | |
5289 NoYoungRegionsClosure() : _success(true) { } | |
5290 bool doHeapRegion(HeapRegion* r) { | |
5291 if (r->is_young()) { | |
5292 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5293 r->bottom(), r->end()); | |
5294 _success = false; | |
5295 } | |
5296 return false; | |
5297 } | |
5298 bool success() { return _success; } | |
5299 }; | |
5300 | |
1394
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5301 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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5302 bool ret = _young_list->check_list_empty(check_sample); |
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5303 |
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5304 if (check_heap) { |
342 | 5305 NoYoungRegionsClosure closure; |
5306 heap_region_iterate(&closure); | |
5307 ret = ret && closure.success(); | |
5308 } | |
5309 | |
5310 return ret; | |
5311 } | |
5312 | |
5313 void G1CollectedHeap::empty_young_list() { | |
5314 assert(heap_lock_held_for_gc(), | |
5315 "the heap lock should already be held by or for this thread"); | |
5316 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
5317 | |
5318 _young_list->empty_list(); | |
5319 } | |
5320 | |
5321 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
5322 bool no_allocs = true; | |
5323 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
5324 HeapRegion* r = _gc_alloc_regions[ap]; | |
5325 no_allocs = r == NULL || r->saved_mark_at_top(); | |
5326 } | |
5327 return no_allocs; | |
5328 } | |
5329 | |
545 | 5330 void G1CollectedHeap::retire_all_alloc_regions() { |
342 | 5331 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
5332 HeapRegion* r = _gc_alloc_regions[ap]; | |
5333 if (r != NULL) { | |
5334 // Check for aliases. | |
5335 bool has_processed_alias = false; | |
5336 for (int i = 0; i < ap; ++i) { | |
5337 if (_gc_alloc_regions[i] == r) { | |
5338 has_processed_alias = true; | |
5339 break; | |
5340 } | |
5341 } | |
5342 if (!has_processed_alias) { | |
545 | 5343 retire_alloc_region(r, false /* par */); |
342 | 5344 } |
5345 } | |
5346 } | |
5347 } | |
5348 | |
5349 // Done at the start of full GC. | |
5350 void G1CollectedHeap::tear_down_region_lists() { | |
2152 | 5351 _free_list.remove_all(); |
342 | 5352 } |
5353 | |
5354 class RegionResetter: public HeapRegionClosure { | |
2152 | 5355 G1CollectedHeap* _g1h; |
5356 FreeRegionList _local_free_list; | |
5357 | |
342 | 5358 public: |
2152 | 5359 RegionResetter() : _g1h(G1CollectedHeap::heap()), |
5360 _local_free_list("Local Free List for RegionResetter") { } | |
5361 | |
342 | 5362 bool doHeapRegion(HeapRegion* r) { |
5363 if (r->continuesHumongous()) return false; | |
5364 if (r->top() > r->bottom()) { | |
5365 if (r->top() < r->end()) { | |
5366 Copy::fill_to_words(r->top(), | |
5367 pointer_delta(r->end(), r->top())); | |
5368 } | |
5369 } else { | |
5370 assert(r->is_empty(), "tautology"); | |
2152 | 5371 _local_free_list.add_as_tail(r); |
342 | 5372 } |
5373 return false; | |
5374 } | |
5375 | |
2152 | 5376 void update_free_lists() { |
5377 _g1h->update_sets_after_freeing_regions(0, &_local_free_list, NULL, | |
5378 false /* par */); | |
5379 } | |
342 | 5380 }; |
5381 | |
5382 // Done at the end of full GC. | |
5383 void G1CollectedHeap::rebuild_region_lists() { | |
5384 // This needs to go at the end of the full GC. | |
5385 RegionResetter rs; | |
5386 heap_region_iterate(&rs); | |
2152 | 5387 rs.update_free_lists(); |
342 | 5388 } |
5389 | |
5390 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5391 _refine_cte_cl->set_concurrent(concurrent); | |
5392 } | |
5393 | |
5394 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5395 HeapRegion* hr = heap_region_containing(p); | |
5396 if (hr == NULL) { | |
5397 return is_in_permanent(p); | |
5398 } else { | |
5399 return hr->is_in(p); | |
5400 } | |
5401 } | |
2152 | 5402 |
2433
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5403 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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5404 bool force) { |
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5405 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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5406 assert(!force || g1_policy()->can_expand_young_list(), |
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5407 "if force is true we should be able to expand the young list"); |
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5408 if (force || !g1_policy()->is_young_list_full()) { |
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5409 HeapRegion* new_alloc_region = new_region(word_size, |
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5410 false /* do_expand */); |
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5411 if (new_alloc_region != NULL) { |
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5412 g1_policy()->update_region_num(true /* next_is_young */); |
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5413 set_region_short_lived_locked(new_alloc_region); |
3289
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5414 g1mm()->update_eden_counters(); |
2433
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5415 return new_alloc_region; |
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5416 } |
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5417 } |
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5418 return NULL; |
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5419 } |
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5420 |
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5421 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
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5422 size_t allocated_bytes) { |
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5423 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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5424 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
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5425 |
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5426 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
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5427 _summary_bytes_used += allocated_bytes; |
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5428 } |
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5429 |
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5430 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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5431 bool force) { |
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5432 return _g1h->new_mutator_alloc_region(word_size, force); |
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5433 } |
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5434 |
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5435 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
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5436 size_t allocated_bytes) { |
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5437 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
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5438 } |
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5439 |
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5440 // Heap region set verification |
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5441 |
2152 | 5442 class VerifyRegionListsClosure : public HeapRegionClosure { |
5443 private: | |
5444 HumongousRegionSet* _humongous_set; | |
5445 FreeRegionList* _free_list; | |
5446 size_t _region_count; | |
5447 | |
5448 public: | |
5449 VerifyRegionListsClosure(HumongousRegionSet* humongous_set, | |
5450 FreeRegionList* free_list) : | |
5451 _humongous_set(humongous_set), _free_list(free_list), | |
5452 _region_count(0) { } | |
5453 | |
5454 size_t region_count() { return _region_count; } | |
5455 | |
5456 bool doHeapRegion(HeapRegion* hr) { | |
5457 _region_count += 1; | |
5458 | |
5459 if (hr->continuesHumongous()) { | |
5460 return false; | |
5461 } | |
5462 | |
5463 if (hr->is_young()) { | |
5464 // TODO | |
5465 } else if (hr->startsHumongous()) { | |
5466 _humongous_set->verify_next_region(hr); | |
5467 } else if (hr->is_empty()) { | |
5468 _free_list->verify_next_region(hr); | |
5469 } | |
5470 return false; | |
5471 } | |
5472 }; | |
5473 | |
3766 | 5474 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
5475 HeapWord* bottom) { | |
5476 HeapWord* end = bottom + HeapRegion::GrainWords; | |
5477 MemRegion mr(bottom, end); | |
5478 assert(_g1_reserved.contains(mr), "invariant"); | |
5479 // This might return NULL if the allocation fails | |
5480 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
5481 } | |
5482 | |
2152 | 5483 void G1CollectedHeap::verify_region_sets() { |
5484 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
5485 | |
5486 // First, check the explicit lists. | |
5487 _free_list.verify(); | |
5488 { | |
5489 // Given that a concurrent operation might be adding regions to | |
5490 // the secondary free list we have to take the lock before | |
5491 // verifying it. | |
5492 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5493 _secondary_free_list.verify(); | |
5494 } | |
5495 _humongous_set.verify(); | |
5496 | |
5497 // If a concurrent region freeing operation is in progress it will | |
5498 // be difficult to correctly attributed any free regions we come | |
5499 // across to the correct free list given that they might belong to | |
5500 // one of several (free_list, secondary_free_list, any local lists, | |
5501 // etc.). So, if that's the case we will skip the rest of the | |
5502 // verification operation. Alternatively, waiting for the concurrent | |
5503 // operation to complete will have a non-trivial effect on the GC's | |
5504 // operation (no concurrent operation will last longer than the | |
5505 // interval between two calls to verification) and it might hide | |
5506 // any issues that we would like to catch during testing. | |
5507 if (free_regions_coming()) { | |
5508 return; | |
5509 } | |
5510 | |
2361 | 5511 // Make sure we append the secondary_free_list on the free_list so |
5512 // that all free regions we will come across can be safely | |
5513 // attributed to the free_list. | |
5514 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 5515 |
5516 // Finally, make sure that the region accounting in the lists is | |
5517 // consistent with what we see in the heap. | |
5518 _humongous_set.verify_start(); | |
5519 _free_list.verify_start(); | |
5520 | |
5521 VerifyRegionListsClosure cl(&_humongous_set, &_free_list); | |
5522 heap_region_iterate(&cl); | |
5523 | |
5524 _humongous_set.verify_end(); | |
5525 _free_list.verify_end(); | |
342 | 5526 } |