Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 3982:273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
Summary: Some objects may not be marked in the event of an evacuation failure in a partially young GC, during a marking cycle. Avoid this situation by not allowing partially young GCs during a marking cycle.
Reviewed-by: tonyp, ysr, brutisso
author | johnc |
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date | Wed, 28 Sep 2011 10:36:31 -0700 |
parents | 8229bd737950 |
children | 811ec3d0833b |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
1972 | 35 #include "gc_implementation/g1/g1MarkSweep.hpp" |
36 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
37 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
38 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
39 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
40 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
41 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
42 #include "memory/gcLocker.inline.hpp" | |
43 #include "memory/genOopClosures.inline.hpp" | |
44 #include "memory/generationSpec.hpp" | |
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45 #include "memory/referenceProcessor.hpp" |
1972 | 46 #include "oops/oop.inline.hpp" |
47 #include "oops/oop.pcgc.inline.hpp" | |
48 #include "runtime/aprofiler.hpp" | |
49 #include "runtime/vmThread.hpp" | |
342 | 50 |
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51 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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52 |
342 | 53 // turn it on so that the contents of the young list (scan-only / |
54 // to-be-collected) are printed at "strategic" points before / during | |
55 // / after the collection --- this is useful for debugging | |
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56 #define YOUNG_LIST_VERBOSE 0 |
342 | 57 // CURRENT STATUS |
58 // This file is under construction. Search for "FIXME". | |
59 | |
60 // INVARIANTS/NOTES | |
61 // | |
62 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 63 // serialized by acquiring the HeapLock. This happens in mem_allocate |
64 // and allocate_new_tlab, which are the "entry" points to the | |
65 // allocation code from the rest of the JVM. (Note that this does not | |
66 // apply to TLAB allocation, which is not part of this interface: it | |
67 // is done by clients of this interface.) | |
342 | 68 |
69 // Local to this file. | |
70 | |
71 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
72 SuspendibleThreadSet* _sts; | |
73 G1RemSet* _g1rs; | |
74 ConcurrentG1Refine* _cg1r; | |
75 bool _concurrent; | |
76 public: | |
77 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
78 G1RemSet* g1rs, | |
79 ConcurrentG1Refine* cg1r) : | |
80 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
81 {} | |
82 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 83 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
84 // This path is executed by the concurrent refine or mutator threads, | |
85 // concurrently, and so we do not care if card_ptr contains references | |
86 // that point into the collection set. | |
87 assert(!oops_into_cset, "should be"); | |
88 | |
342 | 89 if (_concurrent && _sts->should_yield()) { |
90 // Caller will actually yield. | |
91 return false; | |
92 } | |
93 // Otherwise, we finished successfully; return true. | |
94 return true; | |
95 } | |
96 void set_concurrent(bool b) { _concurrent = b; } | |
97 }; | |
98 | |
99 | |
100 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
101 int _calls; | |
102 G1CollectedHeap* _g1h; | |
103 CardTableModRefBS* _ctbs; | |
104 int _histo[256]; | |
105 public: | |
106 ClearLoggedCardTableEntryClosure() : | |
107 _calls(0) | |
108 { | |
109 _g1h = G1CollectedHeap::heap(); | |
110 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
111 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
112 } | |
113 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
114 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
115 _calls++; | |
116 unsigned char* ujb = (unsigned char*)card_ptr; | |
117 int ind = (int)(*ujb); | |
118 _histo[ind]++; | |
119 *card_ptr = -1; | |
120 } | |
121 return true; | |
122 } | |
123 int calls() { return _calls; } | |
124 void print_histo() { | |
125 gclog_or_tty->print_cr("Card table value histogram:"); | |
126 for (int i = 0; i < 256; i++) { | |
127 if (_histo[i] != 0) { | |
128 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
129 } | |
130 } | |
131 } | |
132 }; | |
133 | |
134 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
135 int _calls; | |
136 G1CollectedHeap* _g1h; | |
137 CardTableModRefBS* _ctbs; | |
138 public: | |
139 RedirtyLoggedCardTableEntryClosure() : | |
140 _calls(0) | |
141 { | |
142 _g1h = G1CollectedHeap::heap(); | |
143 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
144 } | |
145 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
146 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
147 _calls++; | |
148 *card_ptr = 0; | |
149 } | |
150 return true; | |
151 } | |
152 int calls() { return _calls; } | |
153 }; | |
154 | |
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155 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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156 public: |
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157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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158 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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159 return true; |
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160 } |
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161 }; |
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162 |
342 | 163 YoungList::YoungList(G1CollectedHeap* g1h) |
164 : _g1h(g1h), _head(NULL), | |
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165 _length(0), |
342 | 166 _last_sampled_rs_lengths(0), |
545 | 167 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 168 { |
169 guarantee( check_list_empty(false), "just making sure..." ); | |
170 } | |
171 | |
172 void YoungList::push_region(HeapRegion *hr) { | |
173 assert(!hr->is_young(), "should not already be young"); | |
174 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
175 | |
176 hr->set_next_young_region(_head); | |
177 _head = hr; | |
178 | |
179 hr->set_young(); | |
180 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
181 ++_length; | |
182 } | |
183 | |
184 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 185 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 186 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
187 | |
188 hr->set_next_young_region(_survivor_head); | |
189 if (_survivor_head == NULL) { | |
545 | 190 _survivor_tail = hr; |
342 | 191 } |
192 _survivor_head = hr; | |
193 | |
194 ++_survivor_length; | |
195 } | |
196 | |
197 void YoungList::empty_list(HeapRegion* list) { | |
198 while (list != NULL) { | |
199 HeapRegion* next = list->get_next_young_region(); | |
200 list->set_next_young_region(NULL); | |
201 list->uninstall_surv_rate_group(); | |
202 list->set_not_young(); | |
203 list = next; | |
204 } | |
205 } | |
206 | |
207 void YoungList::empty_list() { | |
208 assert(check_list_well_formed(), "young list should be well formed"); | |
209 | |
210 empty_list(_head); | |
211 _head = NULL; | |
212 _length = 0; | |
213 | |
214 empty_list(_survivor_head); | |
215 _survivor_head = NULL; | |
545 | 216 _survivor_tail = NULL; |
342 | 217 _survivor_length = 0; |
218 | |
219 _last_sampled_rs_lengths = 0; | |
220 | |
221 assert(check_list_empty(false), "just making sure..."); | |
222 } | |
223 | |
224 bool YoungList::check_list_well_formed() { | |
225 bool ret = true; | |
226 | |
227 size_t length = 0; | |
228 HeapRegion* curr = _head; | |
229 HeapRegion* last = NULL; | |
230 while (curr != NULL) { | |
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231 if (!curr->is_young()) { |
342 | 232 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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233 "incorrectly tagged (y: %d, surv: %d)", |
342 | 234 curr->bottom(), curr->end(), |
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235 curr->is_young(), curr->is_survivor()); |
342 | 236 ret = false; |
237 } | |
238 ++length; | |
239 last = curr; | |
240 curr = curr->get_next_young_region(); | |
241 } | |
242 ret = ret && (length == _length); | |
243 | |
244 if (!ret) { | |
245 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
246 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
247 length, _length); | |
248 } | |
249 | |
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250 return ret; |
342 | 251 } |
252 | |
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253 bool YoungList::check_list_empty(bool check_sample) { |
342 | 254 bool ret = true; |
255 | |
256 if (_length != 0) { | |
257 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
258 _length); | |
259 ret = false; | |
260 } | |
261 if (check_sample && _last_sampled_rs_lengths != 0) { | |
262 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
263 ret = false; | |
264 } | |
265 if (_head != NULL) { | |
266 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
267 ret = false; | |
268 } | |
269 if (!ret) { | |
270 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
271 } | |
272 | |
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273 return ret; |
342 | 274 } |
275 | |
276 void | |
277 YoungList::rs_length_sampling_init() { | |
278 _sampled_rs_lengths = 0; | |
279 _curr = _head; | |
280 } | |
281 | |
282 bool | |
283 YoungList::rs_length_sampling_more() { | |
284 return _curr != NULL; | |
285 } | |
286 | |
287 void | |
288 YoungList::rs_length_sampling_next() { | |
289 assert( _curr != NULL, "invariant" ); | |
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290 size_t rs_length = _curr->rem_set()->occupied(); |
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291 |
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292 _sampled_rs_lengths += rs_length; |
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293 |
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294 // The current region may not yet have been added to the |
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295 // incremental collection set (it gets added when it is |
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296 // retired as the current allocation region). |
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297 if (_curr->in_collection_set()) { |
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298 // Update the collection set policy information for this region |
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299 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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300 } |
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301 |
342 | 302 _curr = _curr->get_next_young_region(); |
303 if (_curr == NULL) { | |
304 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
305 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
306 } | |
307 } | |
308 | |
309 void | |
310 YoungList::reset_auxilary_lists() { | |
311 guarantee( is_empty(), "young list should be empty" ); | |
312 assert(check_list_well_formed(), "young list should be well formed"); | |
313 | |
314 // Add survivor regions to SurvRateGroup. | |
315 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 316 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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317 |
342 | 318 for (HeapRegion* curr = _survivor_head; |
319 curr != NULL; | |
320 curr = curr->get_next_young_region()) { | |
321 _g1h->g1_policy()->set_region_survivors(curr); | |
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322 |
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323 // The region is a non-empty survivor so let's add it to |
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324 // the incremental collection set for the next evacuation |
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325 // pause. |
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326 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
342 | 327 } |
328 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
329 | |
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330 _head = _survivor_head; |
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331 _length = _survivor_length; |
342 | 332 if (_survivor_head != NULL) { |
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333 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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334 assert(_survivor_length > 0, "invariant"); |
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335 _survivor_tail->set_next_young_region(NULL); |
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336 } |
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337 |
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338 // Don't clear the survivor list handles until the start of |
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339 // the next evacuation pause - we need it in order to re-tag |
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340 // the survivor regions from this evacuation pause as 'young' |
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341 // at the start of the next. |
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342 |
545 | 343 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 344 |
345 assert(check_list_well_formed(), "young list should be well formed"); | |
346 } | |
347 | |
348 void YoungList::print() { | |
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349 HeapRegion* lists[] = {_head, _survivor_head}; |
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350 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 351 |
352 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
353 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
354 HeapRegion *curr = lists[list]; | |
355 if (curr == NULL) | |
356 gclog_or_tty->print_cr(" empty"); | |
357 while (curr != NULL) { | |
358 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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359 "age: %4d, y: %d, surv: %d", |
342 | 360 curr->bottom(), curr->end(), |
361 curr->top(), | |
362 curr->prev_top_at_mark_start(), | |
363 curr->next_top_at_mark_start(), | |
364 curr->top_at_conc_mark_count(), | |
365 curr->age_in_surv_rate_group_cond(), | |
366 curr->is_young(), | |
367 curr->is_survivor()); | |
368 curr = curr->get_next_young_region(); | |
369 } | |
370 } | |
371 | |
372 gclog_or_tty->print_cr(""); | |
373 } | |
374 | |
796
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375 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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376 { |
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377 // Claim the right to put the region on the dirty cards region list |
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378 // by installing a self pointer. |
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379 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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380 if (next == NULL) { |
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381 HeapRegion* res = (HeapRegion*) |
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382 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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383 NULL); |
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384 if (res == NULL) { |
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385 HeapRegion* head; |
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386 do { |
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387 // Put the region to the dirty cards region list. |
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388 head = _dirty_cards_region_list; |
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389 next = (HeapRegion*) |
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390 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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391 if (next == head) { |
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392 assert(hr->get_next_dirty_cards_region() == hr, |
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393 "hr->get_next_dirty_cards_region() != hr"); |
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394 if (next == NULL) { |
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395 // The last region in the list points to itself. |
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396 hr->set_next_dirty_cards_region(hr); |
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397 } else { |
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398 hr->set_next_dirty_cards_region(next); |
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399 } |
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400 } |
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401 } while (next != head); |
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402 } |
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403 } |
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404 } |
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405 |
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406 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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407 { |
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408 HeapRegion* head; |
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409 HeapRegion* hr; |
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410 do { |
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411 head = _dirty_cards_region_list; |
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412 if (head == NULL) { |
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413 return NULL; |
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414 } |
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415 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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416 if (head == new_head) { |
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417 // The last region. |
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418 new_head = NULL; |
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419 } |
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420 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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421 head); |
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422 } while (hr != head); |
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423 assert(hr != NULL, "invariant"); |
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424 hr->set_next_dirty_cards_region(NULL); |
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425 return hr; |
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426 } |
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427 |
342 | 428 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 429 _cg1r->stop(); |
342 | 430 _cmThread->stop(); |
431 } | |
432 | |
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433 #ifdef ASSERT |
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434 // A region is added to the collection set as it is retired |
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435 // so an address p can point to a region which will be in the |
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436 // collection set but has not yet been retired. This method |
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437 // therefore is only accurate during a GC pause after all |
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438 // regions have been retired. It is used for debugging |
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439 // to check if an nmethod has references to objects that can |
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440 // be move during a partial collection. Though it can be |
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441 // inaccurate, it is sufficient for G1 because the conservative |
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442 // implementation of is_scavengable() for G1 will indicate that |
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443 // all nmethods must be scanned during a partial collection. |
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444 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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445 HeapRegion* hr = heap_region_containing(p); |
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446 return hr != NULL && hr->in_collection_set(); |
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447 } |
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448 #endif |
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449 |
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450 // Returns true if the reference points to an object that |
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451 // can move in an incremental collecction. |
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452 bool G1CollectedHeap::is_scavengable(const void* p) { |
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453 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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454 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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455 HeapRegion* hr = heap_region_containing(p); |
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456 if (hr == NULL) { |
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457 // perm gen (or null) |
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458 return false; |
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459 } else { |
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460 return !hr->isHumongous(); |
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461 } |
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462 } |
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463 |
342 | 464 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
465 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
466 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
467 | |
468 // Count the dirty cards at the start. | |
469 CountNonCleanMemRegionClosure count1(this); | |
470 ct_bs->mod_card_iterate(&count1); | |
471 int orig_count = count1.n(); | |
472 | |
473 // First clear the logged cards. | |
474 ClearLoggedCardTableEntryClosure clear; | |
475 dcqs.set_closure(&clear); | |
476 dcqs.apply_closure_to_all_completed_buffers(); | |
477 dcqs.iterate_closure_all_threads(false); | |
478 clear.print_histo(); | |
479 | |
480 // Now ensure that there's no dirty cards. | |
481 CountNonCleanMemRegionClosure count2(this); | |
482 ct_bs->mod_card_iterate(&count2); | |
483 if (count2.n() != 0) { | |
484 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
485 count2.n(), orig_count); | |
486 } | |
487 guarantee(count2.n() == 0, "Card table should be clean."); | |
488 | |
489 RedirtyLoggedCardTableEntryClosure redirty; | |
490 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
491 dcqs.apply_closure_to_all_completed_buffers(); | |
492 dcqs.iterate_closure_all_threads(false); | |
493 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
494 clear.calls(), orig_count); | |
495 guarantee(redirty.calls() == clear.calls(), | |
496 "Or else mechanism is broken."); | |
497 | |
498 CountNonCleanMemRegionClosure count3(this); | |
499 ct_bs->mod_card_iterate(&count3); | |
500 if (count3.n() != orig_count) { | |
501 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
502 orig_count, count3.n()); | |
503 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
504 } | |
505 | |
506 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
507 } | |
508 | |
509 // Private class members. | |
510 | |
511 G1CollectedHeap* G1CollectedHeap::_g1h; | |
512 | |
513 // Private methods. | |
514 | |
2152 | 515 HeapRegion* |
2361 | 516 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 517 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
518 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
519 if (!_secondary_free_list.is_empty()) { | |
520 if (G1ConcRegionFreeingVerbose) { | |
521 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
522 "secondary_free_list has "SIZE_FORMAT" entries", | |
523 _secondary_free_list.length()); | |
524 } | |
525 // It looks as if there are free regions available on the | |
526 // secondary_free_list. Let's move them to the free_list and try | |
527 // again to allocate from it. | |
528 append_secondary_free_list(); | |
529 | |
530 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
531 "empty we should have moved at least one entry to the free_list"); | |
532 HeapRegion* res = _free_list.remove_head(); | |
533 if (G1ConcRegionFreeingVerbose) { | |
534 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
535 "allocated "HR_FORMAT" from secondary_free_list", | |
536 HR_FORMAT_PARAMS(res)); | |
537 } | |
538 return res; | |
539 } | |
540 | |
541 // Wait here until we get notifed either when (a) there are no | |
542 // more free regions coming or (b) some regions have been moved on | |
543 // the secondary_free_list. | |
544 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
545 } | |
546 | |
547 if (G1ConcRegionFreeingVerbose) { | |
548 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
549 "could not allocate from secondary_free_list"); | |
550 } | |
551 return NULL; | |
552 } | |
553 | |
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554 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
2152 | 555 assert(!isHumongous(word_size) || |
556 word_size <= (size_t) HeapRegion::GrainWords, | |
557 "the only time we use this to allocate a humongous region is " | |
558 "when we are allocating a single humongous region"); | |
559 | |
560 HeapRegion* res; | |
561 if (G1StressConcRegionFreeing) { | |
562 if (!_secondary_free_list.is_empty()) { | |
563 if (G1ConcRegionFreeingVerbose) { | |
564 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
565 "forced to look at the secondary_free_list"); | |
566 } | |
2361 | 567 res = new_region_try_secondary_free_list(); |
2152 | 568 if (res != NULL) { |
569 return res; | |
570 } | |
571 } | |
572 } | |
573 res = _free_list.remove_head_or_null(); | |
574 if (res == NULL) { | |
575 if (G1ConcRegionFreeingVerbose) { | |
576 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
577 "res == NULL, trying the secondary_free_list"); | |
578 } | |
2361 | 579 res = new_region_try_secondary_free_list(); |
2152 | 580 } |
342 | 581 if (res == NULL && do_expand) { |
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582 ergo_verbose1(ErgoHeapSizing, |
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583 "attempt heap expansion", |
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584 ergo_format_reason("region allocation request failed") |
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585 ergo_format_byte("allocation request"), |
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586 word_size * HeapWordSize); |
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587 if (expand(word_size * HeapWordSize)) { |
3766 | 588 // Even though the heap was expanded, it might not have reached |
589 // the desired size. So, we cannot assume that the allocation | |
590 // will succeed. | |
591 res = _free_list.remove_head_or_null(); | |
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592 } |
342 | 593 } |
594 return res; | |
595 } | |
596 | |
3766 | 597 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
598 size_t word_size) { | |
2361 | 599 assert(isHumongous(word_size), "word_size should be humongous"); |
600 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
601 | |
3766 | 602 size_t first = G1_NULL_HRS_INDEX; |
2152 | 603 if (num_regions == 1) { |
604 // Only one region to allocate, no need to go through the slower | |
605 // path. The caller will attempt the expasion if this fails, so | |
606 // let's not try to expand here too. | |
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607 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 608 if (hr != NULL) { |
609 first = hr->hrs_index(); | |
610 } else { | |
3766 | 611 first = G1_NULL_HRS_INDEX; |
2152 | 612 } |
613 } else { | |
614 // We can't allocate humongous regions while cleanupComplete() is | |
615 // running, since some of the regions we find to be empty might not | |
616 // yet be added to the free list and it is not straightforward to | |
617 // know which list they are on so that we can remove them. Note | |
618 // that we only need to do this if we need to allocate more than | |
619 // one region to satisfy the current humongous allocation | |
620 // request. If we are only allocating one region we use the common | |
621 // region allocation code (see above). | |
622 wait_while_free_regions_coming(); | |
2361 | 623 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 624 |
625 if (free_regions() >= num_regions) { | |
3766 | 626 first = _hrs.find_contiguous(num_regions); |
627 if (first != G1_NULL_HRS_INDEX) { | |
628 for (size_t i = first; i < first + num_regions; ++i) { | |
629 HeapRegion* hr = region_at(i); | |
2152 | 630 assert(hr->is_empty(), "sanity"); |
2361 | 631 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 632 hr->set_pending_removal(true); |
633 } | |
634 _free_list.remove_all_pending(num_regions); | |
635 } | |
636 } | |
637 } | |
638 return first; | |
639 } | |
640 | |
2361 | 641 HeapWord* |
3766 | 642 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 643 size_t num_regions, |
644 size_t word_size) { | |
3766 | 645 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 646 assert(isHumongous(word_size), "word_size should be humongous"); |
647 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
648 | |
649 // Index of last region in the series + 1. | |
3766 | 650 size_t last = first + num_regions; |
2361 | 651 |
652 // We need to initialize the region(s) we just discovered. This is | |
653 // a bit tricky given that it can happen concurrently with | |
654 // refinement threads refining cards on these regions and | |
655 // potentially wanting to refine the BOT as they are scanning | |
656 // those cards (this can happen shortly after a cleanup; see CR | |
657 // 6991377). So we have to set up the region(s) carefully and in | |
658 // a specific order. | |
659 | |
660 // The word size sum of all the regions we will allocate. | |
661 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
662 assert(word_size <= word_size_sum, "sanity"); | |
663 | |
664 // This will be the "starts humongous" region. | |
3766 | 665 HeapRegion* first_hr = region_at(first); |
2361 | 666 // The header of the new object will be placed at the bottom of |
667 // the first region. | |
668 HeapWord* new_obj = first_hr->bottom(); | |
669 // This will be the new end of the first region in the series that | |
670 // should also match the end of the last region in the seriers. | |
671 HeapWord* new_end = new_obj + word_size_sum; | |
672 // This will be the new top of the first region that will reflect | |
673 // this allocation. | |
674 HeapWord* new_top = new_obj + word_size; | |
675 | |
676 // First, we need to zero the header of the space that we will be | |
677 // allocating. When we update top further down, some refinement | |
678 // threads might try to scan the region. By zeroing the header we | |
679 // ensure that any thread that will try to scan the region will | |
680 // come across the zero klass word and bail out. | |
681 // | |
682 // NOTE: It would not have been correct to have used | |
683 // CollectedHeap::fill_with_object() and make the space look like | |
684 // an int array. The thread that is doing the allocation will | |
685 // later update the object header to a potentially different array | |
686 // type and, for a very short period of time, the klass and length | |
687 // fields will be inconsistent. This could cause a refinement | |
688 // thread to calculate the object size incorrectly. | |
689 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
690 | |
691 // We will set up the first region as "starts humongous". This | |
692 // will also update the BOT covering all the regions to reflect | |
693 // that there is a single object that starts at the bottom of the | |
694 // first region. | |
695 first_hr->set_startsHumongous(new_top, new_end); | |
696 | |
697 // Then, if there are any, we will set up the "continues | |
698 // humongous" regions. | |
699 HeapRegion* hr = NULL; | |
3766 | 700 for (size_t i = first + 1; i < last; ++i) { |
701 hr = region_at(i); | |
2361 | 702 hr->set_continuesHumongous(first_hr); |
703 } | |
704 // If we have "continues humongous" regions (hr != NULL), then the | |
705 // end of the last one should match new_end. | |
706 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
707 | |
708 // Up to this point no concurrent thread would have been able to | |
709 // do any scanning on any region in this series. All the top | |
710 // fields still point to bottom, so the intersection between | |
711 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
712 // update the top fields, we'll do a storestore to make sure that | |
713 // no thread sees the update to top before the zeroing of the | |
714 // object header and the BOT initialization. | |
715 OrderAccess::storestore(); | |
716 | |
717 // Now that the BOT and the object header have been initialized, | |
718 // we can update top of the "starts humongous" region. | |
719 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
720 "new_top should be in this region"); | |
721 first_hr->set_top(new_top); | |
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722 if (_hr_printer.is_active()) { |
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723 HeapWord* bottom = first_hr->bottom(); |
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724 HeapWord* end = first_hr->orig_end(); |
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725 if ((first + 1) == last) { |
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726 // the series has a single humongous region |
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727 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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728 } else { |
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729 // the series has more than one humongous regions |
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730 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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731 } |
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732 } |
2361 | 733 |
734 // Now, we will update the top fields of the "continues humongous" | |
735 // regions. The reason we need to do this is that, otherwise, | |
736 // these regions would look empty and this will confuse parts of | |
737 // G1. For example, the code that looks for a consecutive number | |
738 // of empty regions will consider them empty and try to | |
739 // re-allocate them. We can extend is_empty() to also include | |
740 // !continuesHumongous(), but it is easier to just update the top | |
741 // fields here. The way we set top for all regions (i.e., top == | |
742 // end for all regions but the last one, top == new_top for the | |
743 // last one) is actually used when we will free up the humongous | |
744 // region in free_humongous_region(). | |
745 hr = NULL; | |
3766 | 746 for (size_t i = first + 1; i < last; ++i) { |
747 hr = region_at(i); | |
2361 | 748 if ((i + 1) == last) { |
749 // last continues humongous region | |
750 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
751 "new_top should fall on this region"); | |
752 hr->set_top(new_top); | |
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753 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 754 } else { |
755 // not last one | |
756 assert(new_top > hr->end(), "new_top should be above this region"); | |
757 hr->set_top(hr->end()); | |
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758 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 759 } |
760 } | |
761 // If we have continues humongous regions (hr != NULL), then the | |
762 // end of the last one should match new_end and its top should | |
763 // match new_top. | |
764 assert(hr == NULL || | |
765 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
766 | |
767 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
768 _summary_bytes_used += first_hr->used(); | |
769 _humongous_set.add(first_hr); | |
770 | |
771 return new_obj; | |
772 } | |
773 | |
342 | 774 // If could fit into free regions w/o expansion, try. |
775 // Otherwise, if can expand, do so. | |
776 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 777 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 778 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
779 | |
780 verify_region_sets_optional(); | |
342 | 781 |
782 size_t num_regions = | |
1973 | 783 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 784 size_t x_size = expansion_regions(); |
3766 | 785 size_t fs = _hrs.free_suffix(); |
786 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
787 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 788 // The only thing we can do now is attempt expansion. |
342 | 789 if (fs + x_size >= num_regions) { |
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790 // If the number of regions we're trying to allocate for this |
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791 // object is at most the number of regions in the free suffix, |
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792 // then the call to humongous_obj_allocate_find_first() above |
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793 // should have succeeded and we wouldn't be here. |
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794 // |
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795 // We should only be trying to expand when the free suffix is |
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796 // not sufficient for the object _and_ we have some expansion |
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797 // room available. |
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798 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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799 |
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800 ergo_verbose1(ErgoHeapSizing, |
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801 "attempt heap expansion", |
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802 ergo_format_reason("humongous allocation request failed") |
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803 ergo_format_byte("allocation request"), |
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804 word_size * HeapWordSize); |
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805 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 806 // Even though the heap was expanded, it might not have |
807 // reached the desired size. So, we cannot assume that the | |
808 // allocation will succeed. | |
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809 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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810 } |
2152 | 811 } |
812 } | |
813 | |
2361 | 814 HeapWord* result = NULL; |
3766 | 815 if (first != G1_NULL_HRS_INDEX) { |
2361 | 816 result = |
817 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
818 assert(result != NULL, "it should always return a valid result"); | |
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819 |
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820 // A successful humongous object allocation changes the used space |
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821 // information of the old generation so we need to recalculate the |
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822 // sizes and update the jstat counters here. |
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823 g1mm()->update_sizes(); |
2152 | 824 } |
825 | |
826 verify_region_sets_optional(); | |
2361 | 827 |
828 return result; | |
342 | 829 } |
830 | |
1973 | 831 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
832 assert_heap_not_locked_and_not_at_safepoint(); | |
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833 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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834 |
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835 unsigned int dummy_gc_count_before; |
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836 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 837 } |
838 | |
839 HeapWord* | |
840 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 841 bool* gc_overhead_limit_was_exceeded) { |
842 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 843 |
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844 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 845 for (int try_count = 1; /* we'll return */; try_count += 1) { |
846 unsigned int gc_count_before; | |
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847 |
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848 HeapWord* result = NULL; |
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849 if (!isHumongous(word_size)) { |
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850 result = attempt_allocation(word_size, &gc_count_before); |
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851 } else { |
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852 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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853 } |
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854 if (result != NULL) { |
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855 return result; |
342 | 856 } |
857 | |
858 // Create the garbage collection operation... | |
1973 | 859 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 860 // ...and get the VM thread to execute it. |
861 VMThread::execute(&op); | |
1973 | 862 |
863 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
864 // If the operation was successful we'll return the result even | |
865 // if it is NULL. If the allocation attempt failed immediately | |
866 // after a Full GC, it's unlikely we'll be able to allocate now. | |
867 HeapWord* result = op.result(); | |
868 if (result != NULL && !isHumongous(word_size)) { | |
869 // Allocations that take place on VM operations do not do any | |
870 // card dirtying and we have to do it here. We only have to do | |
871 // this for non-humongous allocations, though. | |
872 dirty_young_block(result, word_size); | |
873 } | |
342 | 874 return result; |
1973 | 875 } else { |
876 assert(op.result() == NULL, | |
877 "the result should be NULL if the VM op did not succeed"); | |
342 | 878 } |
879 | |
880 // Give a warning if we seem to be looping forever. | |
881 if ((QueuedAllocationWarningCount > 0) && | |
882 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 883 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 884 } |
885 } | |
1973 | 886 |
887 ShouldNotReachHere(); | |
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888 return NULL; |
342 | 889 } |
890 | |
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891 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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892 unsigned int *gc_count_before_ret) { |
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893 // Make sure you read the note in attempt_allocation_humongous(). |
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894 |
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895 assert_heap_not_locked_and_not_at_safepoint(); |
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896 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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897 "be called for humongous allocation requests"); |
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|
898 |
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|
899 // We should only get here after the first-level allocation attempt |
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|
900 // (attempt_allocation()) failed to allocate. |
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|
901 |
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902 // We will loop until a) we manage to successfully perform the |
abdfc822206f
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|
903 // allocation or b) we successfully schedule a collection which |
abdfc822206f
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|
904 // fails to perform the allocation. b) is the only case when we'll |
abdfc822206f
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|
905 // return NULL. |
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|
906 HeapWord* result = NULL; |
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|
907 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
908 bool should_try_gc; |
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|
909 unsigned int gc_count_before; |
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|
910 |
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|
911 { |
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|
912 MutexLockerEx x(Heap_lock); |
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|
913 |
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|
914 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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|
915 false /* bot_updates */); |
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|
916 if (result != NULL) { |
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|
917 return result; |
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|
918 } |
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|
919 |
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|
920 // If we reach here, attempt_allocation_locked() above failed to |
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|
921 // allocate a new region. So the mutator alloc region should be NULL. |
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922 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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|
923 |
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|
924 if (GC_locker::is_active_and_needs_gc()) { |
abdfc822206f
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|
925 if (g1_policy()->can_expand_young_list()) { |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
926 // No need for an ergo verbose message here, |
20213c8a3c40
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|
927 // can_expand_young_list() does this when it returns true. |
2433
abdfc822206f
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928 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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|
929 false /* bot_updates */); |
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|
930 if (result != NULL) { |
abdfc822206f
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|
931 return result; |
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|
932 } |
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|
933 } |
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|
934 should_try_gc = false; |
abdfc822206f
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|
935 } else { |
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|
936 // Read the GC count while still holding the Heap_lock. |
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|
937 gc_count_before = SharedHeap::heap()->total_collections(); |
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|
938 should_try_gc = true; |
abdfc822206f
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|
939 } |
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|
940 } |
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|
941 |
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|
942 if (should_try_gc) { |
abdfc822206f
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|
943 bool succeeded; |
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|
944 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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|
945 if (result != NULL) { |
abdfc822206f
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|
946 assert(succeeded, "only way to get back a non-NULL result"); |
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|
947 return result; |
abdfc822206f
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|
948 } |
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|
949 |
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|
950 if (succeeded) { |
abdfc822206f
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|
951 // If we get here we successfully scheduled a collection which |
abdfc822206f
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|
952 // failed to allocate. No point in trying to allocate |
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|
953 // further. We'll just return NULL. |
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|
954 MutexLockerEx x(Heap_lock); |
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|
955 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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|
956 return NULL; |
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|
957 } |
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|
958 } else { |
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|
959 GC_locker::stall_until_clear(); |
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|
960 } |
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|
961 |
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|
962 // We can reach here if we were unsuccessul in scheduling a |
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|
963 // collection (because another thread beat us to it) or if we were |
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|
964 // stalled due to the GC locker. In either can we should retry the |
abdfc822206f
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|
965 // allocation attempt in case another thread successfully |
abdfc822206f
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|
966 // performed a collection and reclaimed enough space. We do the |
abdfc822206f
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|
967 // first attempt (without holding the Heap_lock) here and the |
abdfc822206f
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|
968 // follow-on attempt will be at the start of the next loop |
abdfc822206f
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|
969 // iteration (after taking the Heap_lock). |
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|
970 result = _mutator_alloc_region.attempt_allocation(word_size, |
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diff
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|
971 false /* bot_updates */); |
abdfc822206f
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diff
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|
972 if (result != NULL ){ |
abdfc822206f
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parents:
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diff
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|
973 return result; |
abdfc822206f
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parents:
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diff
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|
974 } |
abdfc822206f
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diff
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|
975 |
abdfc822206f
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diff
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|
976 // Give a warning if we seem to be looping forever. |
abdfc822206f
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diff
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|
977 if ((QueuedAllocationWarningCount > 0) && |
abdfc822206f
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diff
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|
978 (try_count % QueuedAllocationWarningCount == 0)) { |
abdfc822206f
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|
979 warning("G1CollectedHeap::attempt_allocation_slow() " |
abdfc822206f
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diff
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|
980 "retries %d times", try_count); |
abdfc822206f
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diff
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|
981 } |
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diff
changeset
|
982 } |
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diff
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|
983 |
abdfc822206f
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diff
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|
984 ShouldNotReachHere(); |
abdfc822206f
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diff
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|
985 return NULL; |
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parents:
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diff
changeset
|
986 } |
abdfc822206f
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diff
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|
987 |
abdfc822206f
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diff
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|
988 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
abdfc822206f
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|
989 unsigned int * gc_count_before_ret) { |
abdfc822206f
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diff
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|
990 // The structure of this method has a lot of similarities to |
abdfc822206f
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parents:
2432
diff
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|
991 // attempt_allocation_slow(). The reason these two were not merged |
abdfc822206f
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diff
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|
992 // into a single one is that such a method would require several "if |
abdfc822206f
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diff
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|
993 // allocation is not humongous do this, otherwise do that" |
abdfc822206f
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2432
diff
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|
994 // conditional paths which would obscure its flow. In fact, an early |
abdfc822206f
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2432
diff
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|
995 // version of this code did use a unified method which was harder to |
abdfc822206f
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2432
diff
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|
996 // follow and, as a result, it had subtle bugs that were hard to |
abdfc822206f
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diff
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|
997 // track down. So keeping these two methods separate allows each to |
abdfc822206f
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2432
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|
998 // be more readable. It will be good to keep these two in sync as |
abdfc822206f
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diff
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|
999 // much as possible. |
abdfc822206f
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diff
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|
1000 |
abdfc822206f
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|
1001 assert_heap_not_locked_and_not_at_safepoint(); |
abdfc822206f
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|
1002 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
abdfc822206f
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diff
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|
1003 "should only be called for humongous allocations"); |
abdfc822206f
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diff
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|
1004 |
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diff
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|
1005 // We will loop until a) we manage to successfully perform the |
abdfc822206f
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diff
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|
1006 // allocation or b) we successfully schedule a collection which |
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diff
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|
1007 // fails to perform the allocation. b) is the only case when we'll |
abdfc822206f
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diff
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|
1008 // return NULL. |
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diff
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|
1009 HeapWord* result = NULL; |
abdfc822206f
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diff
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|
1010 for (int try_count = 1; /* we'll return */; try_count += 1) { |
abdfc822206f
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|
1011 bool should_try_gc; |
abdfc822206f
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diff
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|
1012 unsigned int gc_count_before; |
abdfc822206f
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|
1013 |
abdfc822206f
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|
1014 { |
abdfc822206f
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|
1015 MutexLockerEx x(Heap_lock); |
abdfc822206f
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diff
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|
1016 |
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|
1017 // Given that humongous objects are not allocated in young |
abdfc822206f
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|
1018 // regions, we'll first try to do the allocation without doing a |
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|
1019 // collection hoping that there's enough space in the heap. |
abdfc822206f
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diff
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|
1020 result = humongous_obj_allocate(word_size); |
abdfc822206f
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diff
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|
1021 if (result != NULL) { |
abdfc822206f
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diff
changeset
|
1022 return result; |
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diff
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|
1023 } |
abdfc822206f
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diff
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|
1024 |
abdfc822206f
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|
1025 if (GC_locker::is_active_and_needs_gc()) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
1026 should_try_gc = false; |
abdfc822206f
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diff
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|
1027 } else { |
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1028 // Read the GC count while still holding the Heap_lock. |
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1029 gc_count_before = SharedHeap::heap()->total_collections(); |
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1030 should_try_gc = true; |
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1031 } |
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1032 } |
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1033 |
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1034 if (should_try_gc) { |
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1035 // If we failed to allocate the humongous object, we should try to |
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1036 // do a collection pause (if we're allowed) in case it reclaims |
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1037 // enough space for the allocation to succeed after the pause. |
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1038 |
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1039 bool succeeded; |
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1040 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1041 if (result != NULL) { |
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1042 assert(succeeded, "only way to get back a non-NULL result"); |
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1043 return result; |
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1044 } |
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1045 |
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1046 if (succeeded) { |
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1047 // If we get here we successfully scheduled a collection which |
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1048 // failed to allocate. No point in trying to allocate |
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1049 // further. We'll just return NULL. |
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1050 MutexLockerEx x(Heap_lock); |
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1051 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1052 return NULL; |
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1053 } |
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1054 } else { |
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1055 GC_locker::stall_until_clear(); |
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1056 } |
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1057 |
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1058 // We can reach here if we were unsuccessul in scheduling a |
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1059 // collection (because another thread beat us to it) or if we were |
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1060 // stalled due to the GC locker. In either can we should retry the |
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1061 // allocation attempt in case another thread successfully |
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1062 // performed a collection and reclaimed enough space. Give a |
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1063 // warning if we seem to be looping forever. |
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1064 |
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1065 if ((QueuedAllocationWarningCount > 0) && |
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1066 (try_count % QueuedAllocationWarningCount == 0)) { |
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1067 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1068 "retries %d times", try_count); |
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1069 } |
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1070 } |
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1071 |
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1072 ShouldNotReachHere(); |
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1073 return NULL; |
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1074 } |
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1075 |
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1076 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1077 bool expect_null_mutator_alloc_region) { |
2152 | 1078 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1079 assert(_mutator_alloc_region.get() == NULL || |
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1080 !expect_null_mutator_alloc_region, |
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1081 "the current alloc region was unexpectedly found to be non-NULL"); |
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1082 |
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1083 if (!isHumongous(word_size)) { |
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1084 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1085 false /* bot_updates */); |
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1086 } else { |
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1087 return humongous_obj_allocate(word_size); |
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1088 } |
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1089 |
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1090 ShouldNotReachHere(); |
342 | 1091 } |
1092 | |
1093 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1094 ModRefBarrierSet* _mr_bs; | |
1095 public: | |
1096 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1097 bool doHeapRegion(HeapRegion* r) { | |
1098 r->reset_gc_time_stamp(); | |
1099 if (r->continuesHumongous()) | |
1100 return false; | |
1101 HeapRegionRemSet* hrrs = r->rem_set(); | |
1102 if (hrrs != NULL) hrrs->clear(); | |
1103 // You might think here that we could clear just the cards | |
1104 // corresponding to the used region. But no: if we leave a dirty card | |
1105 // in a region we might allocate into, then it would prevent that card | |
1106 // from being enqueued, and cause it to be missed. | |
1107 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1108 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1109 return false; | |
1110 } | |
1111 }; | |
1112 | |
1113 | |
1114 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1115 ModRefBarrierSet* _mr_bs; | |
1116 public: | |
1117 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1118 bool doHeapRegion(HeapRegion* r) { | |
1119 if (r->continuesHumongous()) return false; | |
1120 if (r->used_region().word_size() != 0) { | |
1121 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1122 } | |
1123 return false; | |
1124 } | |
1125 }; | |
1126 | |
626
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1127 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1128 G1CollectedHeap* _g1h; |
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1129 UpdateRSOopClosure _cl; |
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1130 int _worker_i; |
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1131 public: |
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1132 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1133 _cl(g1->g1_rem_set(), worker_i), |
626
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1134 _worker_i(worker_i), |
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1135 _g1h(g1) |
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1136 { } |
1960
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1137 |
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1138 bool doHeapRegion(HeapRegion* r) { |
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1139 if (!r->continuesHumongous()) { |
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1140 _cl.set_from(r); |
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1141 r->oop_iterate(&_cl); |
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1142 } |
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1143 return false; |
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1144 } |
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1145 }; |
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1146 |
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1147 class ParRebuildRSTask: public AbstractGangTask { |
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1148 G1CollectedHeap* _g1; |
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1149 public: |
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1150 ParRebuildRSTask(G1CollectedHeap* g1) |
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1151 : AbstractGangTask("ParRebuildRSTask"), |
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1152 _g1(g1) |
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1153 { } |
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1154 |
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1155 void work(int i) { |
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1156 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1157 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1158 HeapRegion::RebuildRSClaimValue); |
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1159 } |
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1160 }; |
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1161 |
3778
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1162 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1163 private: |
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1164 G1HRPrinter* _hr_printer; |
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1165 public: |
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1166 bool doHeapRegion(HeapRegion* hr) { |
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1167 assert(!hr->is_young(), "not expecting to find young regions"); |
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1168 // We only generate output for non-empty regions. |
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1169 if (!hr->is_empty()) { |
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1170 if (!hr->isHumongous()) { |
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1171 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1172 } else if (hr->startsHumongous()) { |
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1173 if (hr->capacity() == (size_t) HeapRegion::GrainBytes) { |
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1174 // single humongous region |
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1175 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1176 } else { |
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1177 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1178 } |
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1179 } else { |
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1180 assert(hr->continuesHumongous(), "only way to get here"); |
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1181 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1182 } |
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1183 } |
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1184 return false; |
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1185 } |
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1186 |
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1187 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1188 : _hr_printer(hr_printer) { } |
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1189 }; |
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1190 |
1973 | 1191 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1192 bool clear_all_soft_refs, |
342 | 1193 size_t word_size) { |
2152 | 1194 assert_at_safepoint(true /* should_be_vm_thread */); |
1195 | |
1359
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1196 if (GC_locker::check_active_before_gc()) { |
1973 | 1197 return false; |
1359
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1198 } |
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1199 |
2125
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1200 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1201 ResourceMark rm; |
1202 | |
838
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1203 if (PrintHeapAtGC) { |
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1204 Universe::print_heap_before_gc(); |
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1205 } |
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1206 |
2152 | 1207 verify_region_sets_optional(); |
342 | 1208 |
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1209 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1210 collector_policy()->should_clear_all_soft_refs(); |
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1211 |
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1212 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1213 |
342 | 1214 { |
1215 IsGCActiveMark x; | |
1216 | |
1217 // Timing | |
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1218 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1219 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1220 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1221 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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1222 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1223 PrintGC, true, gclog_or_tty); |
342 | 1224 |
3289
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1225 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
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1226 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1227 |
342 | 1228 double start = os::elapsedTime(); |
1229 g1_policy()->record_full_collection_start(); | |
1230 | |
2152 | 1231 wait_while_free_regions_coming(); |
2361 | 1232 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1233 |
342 | 1234 gc_prologue(true); |
838
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1235 increment_total_collections(true /* full gc */); |
342 | 1236 |
1237 size_t g1h_prev_used = used(); | |
1238 assert(used() == recalculate_used(), "Should be equal"); | |
1239 | |
1240 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1241 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1242 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1243 prepare_for_verify(); |
3772
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1244 Universe::verify(/* allow dirty */ true, |
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1245 /* silent */ false, |
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1246 /* option */ VerifyOption_G1UsePrevMarking); |
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1247 |
342 | 1248 } |
3869
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|
1249 pre_full_gc_dump(); |
342 | 1250 |
1251 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1252 | |
3979
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1253 // Disable discovery and empty the discovered lists |
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1254 // for the CM ref processor. |
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1255 ref_processor_cm()->disable_discovery(); |
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1256 ref_processor_cm()->abandon_partial_discovery(); |
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1257 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1258 |
1259 // Abandon current iterations of concurrent marking and concurrent | |
1260 // refinement, if any are in progress. | |
1261 concurrent_mark()->abort(); | |
1262 | |
1263 // Make sure we'll choose a new allocation region afterwards. | |
2433
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1264 release_mutator_alloc_region(); |
636 | 1265 abandon_gc_alloc_regions(); |
1861 | 1266 g1_rem_set()->cleanupHRRS(); |
342 | 1267 tear_down_region_lists(); |
1394
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1268 |
3778
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1269 // We should call this after we retire any currently active alloc |
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1270 // regions so that all the ALLOC / RETIRE events are generated |
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1271 // before the start GC event. |
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1272 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1273 |
1394
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1274 // We may have added regions to the current incremental collection |
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1275 // set between the last GC or pause and now. We need to clear the |
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1276 // incremental collection set and then start rebuilding it afresh |
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|
1277 // after this full GC. |
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|
1278 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1279 g1_policy()->clear_incremental_cset(); |
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1280 g1_policy()->stop_incremental_cset_building(); |
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|
1281 |
3867
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|
1282 empty_young_list(); |
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1283 g1_policy()->set_full_young_gcs(true); |
342 | 1284 |
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1285 // See the comments in g1CollectedHeap.hpp and |
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|
1286 // G1CollectedHeap::ref_processing_init() about |
1974
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diff
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|
1287 // how reference processing currently works in G1. |
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diff
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|
1288 |
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|
1289 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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|
1290 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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|
1291 |
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|
1292 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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|
1293 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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|
1294 |
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|
1295 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1296 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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1297 |
342 | 1298 // Do collection work |
1299 { | |
1300 HandleMark hm; // Discard invalid handles created during gc | |
3979
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|
1301 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1302 } |
3979
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|
1303 |
2152 | 1304 assert(free_regions() == 0, "we should not have added any free regions"); |
342 | 1305 rebuild_region_lists(); |
1306 | |
1307 _summary_bytes_used = recalculate_used(); | |
1308 | |
3979
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1309 // Enqueue any discovered reference objects that have |
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|
1310 // not been removed from the discovered lists. |
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|
1311 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1312 |
1313 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1314 | |
1089
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1315 MemoryService::track_memory_usage(); |
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|
1316 |
342 | 1317 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1318 HandleMark hm; // Discard invalid handles created during verification | |
1319 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
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diff
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|
1320 prepare_for_verify(); |
3772
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|
1321 Universe::verify(/* allow dirty */ false, |
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|
1322 /* silent */ false, |
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1323 /* option */ VerifyOption_G1UsePrevMarking); |
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1324 |
342 | 1325 } |
3979
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1326 |
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1327 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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1328 ref_processor_stw()->verify_no_references_recorded(); |
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1329 |
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1330 // Note: since we've just done a full GC, concurrent |
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1331 // marking is no longer active. Therefore we need not |
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|
1332 // re-enable reference discovery for the CM ref processor. |
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1333 // That will be done at the start of the next marking cycle. |
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1334 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1335 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1336 |
1337 reset_gc_time_stamp(); | |
1338 // Since everything potentially moved, we will clear all remembered | |
626
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1339 // sets, and clear all cards. Later we will rebuild remebered |
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1340 // sets. We will also reset the GC time stamps of the regions. |
342 | 1341 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1342 heap_region_iterate(&rs_clear); | |
1343 | |
1344 // Resize the heap if necessary. | |
1656
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1345 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1346 |
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1347 if (_hr_printer.is_active()) { |
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1348 // We should do this after we potentially resize the heap so |
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1349 // that all the COMMIT / UNCOMMIT events are generated before |
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1350 // the end GC event. |
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1351 |
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1352 PostCompactionPrinterClosure cl(hr_printer()); |
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1353 heap_region_iterate(&cl); |
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1354 |
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1355 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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1356 } |
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1357 |
342 | 1358 if (_cg1r->use_cache()) { |
1359 _cg1r->clear_and_record_card_counts(); | |
1360 _cg1r->clear_hot_cache(); | |
1361 } | |
1362 | |
626
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|
1363 // Rebuild remembered sets of all regions. |
1833
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1364 |
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1365 if (G1CollectedHeap::use_parallel_gc_threads()) { |
626
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1366 ParRebuildRSTask rebuild_rs_task(this); |
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1367 assert(check_heap_region_claim_values( |
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1368 HeapRegion::InitialClaimValue), "sanity check"); |
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1369 set_par_threads(workers()->total_workers()); |
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1370 workers()->run_task(&rebuild_rs_task); |
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|
1371 set_par_threads(0); |
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1372 assert(check_heap_region_claim_values( |
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1373 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1374 reset_heap_region_claim_values(); |
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|
1375 } else { |
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1376 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1377 heap_region_iterate(&rebuild_rs); |
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|
1378 } |
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1379 |
342 | 1380 if (PrintGC) { |
1381 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1382 } | |
1383 | |
1384 if (true) { // FIXME | |
1385 // Ask the permanent generation to adjust size for full collections | |
1386 perm()->compute_new_size(); | |
1387 } | |
1388 | |
1394
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1389 // Start a new incremental collection set for the next pause |
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1390 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1391 g1_policy()->start_incremental_cset_building(); |
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1392 |
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1393 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1394 // regions to the incremental collection set for the next |
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1395 // evacuation pause. |
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1396 clear_cset_fast_test(); |
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|
1397 |
2433
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|
1398 init_mutator_alloc_region(); |
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1399 |
342 | 1400 double end = os::elapsedTime(); |
1401 g1_policy()->record_full_collection_end(); | |
1402 | |
546
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1403 #ifdef TRACESPINNING |
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1404 ParallelTaskTerminator::print_termination_counts(); |
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1405 #endif |
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1406 |
342 | 1407 gc_epilogue(true); |
1408 | |
794 | 1409 // Discard all rset updates |
1410 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1411 assert(!G1DeferredRSUpdate |
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1412 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1413 } |
1414 | |
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1415 _young_list->reset_sampled_info(); |
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1416 // At this point there should be no regions in the |
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1417 // entire heap tagged as young. |
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1418 assert( check_young_list_empty(true /* check_heap */), |
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1419 "young list should be empty at this point"); |
838
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1420 |
1656
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1421 // Update the number of full collections that have been completed. |
2030
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1422 increment_full_collections_completed(false /* concurrent */); |
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1423 |
3766 | 1424 _hrs.verify_optional(); |
2152 | 1425 verify_region_sets_optional(); |
1426 | |
838
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1427 if (PrintHeapAtGC) { |
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1428 Universe::print_heap_after_gc(); |
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1429 } |
3980
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1430 g1mm()->update_sizes(); |
3869
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1431 post_full_gc_dump(); |
1973 | 1432 |
1433 return true; | |
342 | 1434 } |
1435 | |
1436 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1437 // do_collection() will return whether it succeeded in performing |
1438 // the GC. Currently, there is no facility on the | |
1439 // do_full_collection() API to notify the caller than the collection | |
1440 // did not succeed (e.g., because it was locked out by the GC | |
1441 // locker). So, right now, we'll ignore the return value. | |
1442 bool dummy = do_collection(true, /* explicit_gc */ | |
1443 clear_all_soft_refs, | |
1444 0 /* word_size */); | |
342 | 1445 } |
1446 | |
1447 // This code is mostly copied from TenuredGeneration. | |
1448 void | |
1449 G1CollectedHeap:: | |
1450 resize_if_necessary_after_full_collection(size_t word_size) { | |
1451 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1452 | |
1453 // Include the current allocation, if any, and bytes that will be | |
1454 // pre-allocated to support collections, as "used". | |
1455 const size_t used_after_gc = used(); | |
1456 const size_t capacity_after_gc = capacity(); | |
1457 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1458 | |
1717
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1459 // This is enforced in arguments.cpp. |
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1460 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1461 "otherwise the code below doesn't make sense"); |
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1462 |
342 | 1463 // We don't have floating point command-line arguments |
1717
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1464 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1465 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1466 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1467 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1468 | |
1717
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1469 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1470 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1471 |
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1472 // We have to be careful here as these two calculations can overflow |
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1473 // 32-bit size_t's. |
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1474 double used_after_gc_d = (double) used_after_gc; |
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1475 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1476 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1477 |
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1478 // Let's make sure that they are both under the max heap size, which |
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1479 // by default will make them fit into a size_t. |
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|
1480 double desired_capacity_upper_bound = (double) max_heap_size; |
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1481 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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|
1482 desired_capacity_upper_bound); |
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1483 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1484 desired_capacity_upper_bound); |
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1485 |
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1486 // We can now safely turn them into size_t's. |
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1487 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1488 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1489 |
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1490 // This assert only makes sense here, before we adjust them |
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1491 // with respect to the min and max heap size. |
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1492 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1493 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1494 "maximum_desired_capacity = "SIZE_FORMAT, |
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1495 minimum_desired_capacity, maximum_desired_capacity)); |
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1496 |
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|
1497 // Should not be greater than the heap max size. No need to adjust |
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1498 // it with respect to the heap min size as it's a lower bound (i.e., |
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1499 // we'll try to make the capacity larger than it, not smaller). |
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1500 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1501 // Should not be less than the heap min size. No need to adjust it |
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1502 // with respect to the heap max size as it's an upper bound (i.e., |
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1503 // we'll try to make the capacity smaller than it, not greater). |
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1504 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1505 |
1717
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1506 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1507 // Don't expand unless it's significant |
1508 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
3914
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1509 ergo_verbose4(ErgoHeapSizing, |
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1510 "attempt heap expansion", |
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|
1511 ergo_format_reason("capacity lower than " |
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1512 "min desired capacity after Full GC") |
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|
1513 ergo_format_byte("capacity") |
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|
1514 ergo_format_byte("occupancy") |
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|
1515 ergo_format_byte_perc("min desired capacity"), |
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|
1516 capacity_after_gc, used_after_gc, |
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1517 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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|
1518 expand(expand_bytes); |
342 | 1519 |
1520 // No expansion, now see if we want to shrink | |
1717
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1521 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1522 // Capacity too large, compute shrinking size |
1523 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
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1524 ergo_verbose4(ErgoHeapSizing, |
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1525 "attempt heap shrinking", |
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1526 ergo_format_reason("capacity higher than " |
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1527 "max desired capacity after Full GC") |
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1528 ergo_format_byte("capacity") |
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1529 ergo_format_byte("occupancy") |
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1530 ergo_format_byte_perc("max desired capacity"), |
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1531 capacity_after_gc, used_after_gc, |
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1532 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1533 shrink(shrink_bytes); |
1534 } | |
1535 } | |
1536 | |
1537 | |
1538 HeapWord* | |
1973 | 1539 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1540 bool* succeeded) { | |
2152 | 1541 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1542 |
1543 *succeeded = true; | |
1544 // Let's attempt the allocation first. | |
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1545 HeapWord* result = |
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1546 attempt_allocation_at_safepoint(word_size, |
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1547 false /* expect_null_mutator_alloc_region */); |
1973 | 1548 if (result != NULL) { |
1549 assert(*succeeded, "sanity"); | |
1550 return result; | |
1551 } | |
342 | 1552 |
1553 // In a G1 heap, we're supposed to keep allocation from failing by | |
1554 // incremental pauses. Therefore, at least for now, we'll favor | |
1555 // expansion over collection. (This might change in the future if we can | |
1556 // do something smarter than full collection to satisfy a failed alloc.) | |
1557 result = expand_and_allocate(word_size); | |
1558 if (result != NULL) { | |
1973 | 1559 assert(*succeeded, "sanity"); |
342 | 1560 return result; |
1561 } | |
1562 | |
1973 | 1563 // Expansion didn't work, we'll try to do a Full GC. |
1564 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1565 false, /* clear_all_soft_refs */ | |
1566 word_size); | |
1567 if (!gc_succeeded) { | |
1568 *succeeded = false; | |
1569 return NULL; | |
1570 } | |
1571 | |
1572 // Retry the allocation | |
1573 result = attempt_allocation_at_safepoint(word_size, | |
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1574 true /* expect_null_mutator_alloc_region */); |
342 | 1575 if (result != NULL) { |
1973 | 1576 assert(*succeeded, "sanity"); |
342 | 1577 return result; |
1578 } | |
1579 | |
1973 | 1580 // Then, try a Full GC that will collect all soft references. |
1581 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1582 true, /* clear_all_soft_refs */ | |
1583 word_size); | |
1584 if (!gc_succeeded) { | |
1585 *succeeded = false; | |
1586 return NULL; | |
1587 } | |
1588 | |
1589 // Retry the allocation once more | |
1590 result = attempt_allocation_at_safepoint(word_size, | |
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1591 true /* expect_null_mutator_alloc_region */); |
342 | 1592 if (result != NULL) { |
1973 | 1593 assert(*succeeded, "sanity"); |
342 | 1594 return result; |
1595 } | |
1596 | |
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1597 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1598 "Flag should have been handled and cleared prior to this point"); |
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1599 |
342 | 1600 // What else? We might try synchronous finalization later. If the total |
1601 // space available is large enough for the allocation, then a more | |
1602 // complete compaction phase than we've tried so far might be | |
1603 // appropriate. | |
1973 | 1604 assert(*succeeded, "sanity"); |
342 | 1605 return NULL; |
1606 } | |
1607 | |
1608 // Attempting to expand the heap sufficiently | |
1609 // to support an allocation of the given "word_size". If | |
1610 // successful, perform the allocation and return the address of the | |
1611 // allocated block, or else "NULL". | |
1612 | |
1613 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1614 assert_at_safepoint(true /* should_be_vm_thread */); |
1615 | |
1616 verify_region_sets_optional(); | |
1973 | 1617 |
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1618 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1619 ergo_verbose1(ErgoHeapSizing, |
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1620 "attempt heap expansion", |
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1621 ergo_format_reason("allocation request failed") |
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1622 ergo_format_byte("allocation request"), |
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1623 word_size * HeapWordSize); |
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1624 if (expand(expand_bytes)) { |
3766 | 1625 _hrs.verify_optional(); |
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1626 verify_region_sets_optional(); |
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1627 return attempt_allocation_at_safepoint(word_size, |
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1628 false /* expect_null_mutator_alloc_region */); |
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1629 } |
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1630 return NULL; |
342 | 1631 } |
1632 | |
3766 | 1633 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1634 HeapWord* new_end) { | |
1635 assert(old_end != new_end, "don't call this otherwise"); | |
1636 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1637 | |
1638 // Update the committed mem region. | |
1639 _g1_committed.set_end(new_end); | |
1640 // Tell the card table about the update. | |
1641 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1642 // Tell the BOT about the update. | |
1643 _bot_shared->resize(_g1_committed.word_size()); | |
1644 } | |
1645 | |
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1646 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1647 size_t old_mem_size = _g1_storage.committed_size(); |
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1648 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1649 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1650 HeapRegion::GrainBytes); | |
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1651 ergo_verbose2(ErgoHeapSizing, |
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1652 "expand the heap", |
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1653 ergo_format_byte("requested expansion amount") |
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1654 ergo_format_byte("attempted expansion amount"), |
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1655 expand_bytes, aligned_expand_bytes); |
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1656 |
3766 | 1657 // First commit the memory. |
1658 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1659 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1660 if (successful) { |
3766 | 1661 // Then propagate this update to the necessary data structures. |
1662 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1663 update_committed_space(old_end, new_end); | |
1664 | |
1665 FreeRegionList expansion_list("Local Expansion List"); | |
1666 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1667 assert(mr.start() == old_end, "post-condition"); | |
1668 // mr might be a smaller region than what was requested if | |
1669 // expand_by() was unable to allocate the HeapRegion instances | |
1670 assert(mr.end() <= new_end, "post-condition"); | |
1671 | |
1672 size_t actual_expand_bytes = mr.byte_size(); | |
1673 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1674 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1675 "post-condition"); | |
1676 if (actual_expand_bytes < aligned_expand_bytes) { | |
1677 // We could not expand _hrs to the desired size. In this case we | |
1678 // need to shrink the committed space accordingly. | |
1679 assert(mr.end() < new_end, "invariant"); | |
1680 | |
1681 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1682 // First uncommit the memory. | |
1683 _g1_storage.shrink_by(diff_bytes); | |
1684 // Then propagate this update to the necessary data structures. | |
1685 update_committed_space(new_end, mr.end()); | |
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1686 } |
3766 | 1687 _free_list.add_as_tail(&expansion_list); |
3778
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1688 |
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1689 if (_hr_printer.is_active()) { |
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1690 HeapWord* curr = mr.start(); |
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1691 while (curr < mr.end()) { |
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1692 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1693 _hr_printer.commit(curr, curr_end); |
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1694 curr = curr_end; |
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1695 } |
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1696 assert(curr == mr.end(), "post-condition"); |
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1697 } |
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1698 g1_policy()->record_new_heap_size(n_regions()); |
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1699 } else { |
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1700 ergo_verbose0(ErgoHeapSizing, |
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1701 "did not expand the heap", |
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1702 ergo_format_reason("heap expansion operation failed")); |
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1703 // The expansion of the virtual storage space was unsuccessful. |
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1704 // Let's see if it was because we ran out of swap. |
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1705 if (G1ExitOnExpansionFailure && |
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1706 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1707 // We had head room... |
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1708 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1709 } |
1710 } | |
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1711 return successful; |
342 | 1712 } |
1713 | |
3766 | 1714 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1715 size_t old_mem_size = _g1_storage.committed_size(); |
1716 size_t aligned_shrink_bytes = | |
1717 ReservedSpace::page_align_size_down(shrink_bytes); | |
1718 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1719 HeapRegion::GrainBytes); | |
1720 size_t num_regions_deleted = 0; | |
3766 | 1721 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1722 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1723 assert(mr.end() == old_end, "post-condition"); | |
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1724 |
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1725 ergo_verbose3(ErgoHeapSizing, |
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1726 "shrink the heap", |
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1727 ergo_format_byte("requested shrinking amount") |
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1728 ergo_format_byte("aligned shrinking amount") |
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1729 ergo_format_byte("attempted shrinking amount"), |
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1730 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1731 if (mr.byte_size() > 0) { |
3778
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1732 if (_hr_printer.is_active()) { |
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1733 HeapWord* curr = mr.end(); |
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1734 while (curr > mr.start()) { |
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1735 HeapWord* curr_end = curr; |
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1736 curr -= HeapRegion::GrainWords; |
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1737 _hr_printer.uncommit(curr, curr_end); |
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1738 } |
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1739 assert(curr == mr.start(), "post-condition"); |
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1740 } |
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1741 |
342 | 1742 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1743 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1744 assert(mr.start() == new_end, "post-condition"); | |
1745 | |
1746 _expansion_regions += num_regions_deleted; | |
1747 update_committed_space(old_end, new_end); | |
1748 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1749 g1_policy()->record_new_heap_size(n_regions()); |
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1750 } else { |
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1751 ergo_verbose0(ErgoHeapSizing, |
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1752 "did not shrink the heap", |
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1753 ergo_format_reason("heap shrinking operation failed")); |
342 | 1754 } |
1755 } | |
1756 | |
1757 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1758 verify_region_sets_optional(); |
1759 | |
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1760 // We should only reach here at the end of a Full GC which means we |
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1761 // should not not be holding to any GC alloc regions. The method |
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1762 // below will make sure of that and do any remaining clean up. |
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1763 abandon_gc_alloc_regions(); |
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1764 |
2152 | 1765 // Instead of tearing down / rebuilding the free lists here, we |
1766 // could instead use the remove_all_pending() method on free_list to | |
1767 // remove only the ones that we need to remove. | |
342 | 1768 tear_down_region_lists(); // We will rebuild them in a moment. |
1769 shrink_helper(shrink_bytes); | |
1770 rebuild_region_lists(); | |
2152 | 1771 |
3766 | 1772 _hrs.verify_optional(); |
2152 | 1773 verify_region_sets_optional(); |
342 | 1774 } |
1775 | |
1776 // Public methods. | |
1777 | |
1778 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1779 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1780 #endif // _MSC_VER | |
1781 | |
1782 | |
1783 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1784 SharedHeap(policy_), | |
1785 _g1_policy(policy_), | |
1111 | 1786 _dirty_card_queue_set(false), |
1705 | 1787 _into_cset_dirty_card_queue_set(false), |
3979
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1788 _is_alive_closure_cm(this), |
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1789 _is_alive_closure_stw(this), |
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1790 _ref_processor_cm(NULL), |
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1791 _ref_processor_stw(NULL), |
342 | 1792 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1793 _bot_shared(NULL), | |
1794 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1795 _evac_failure_scan_stack(NULL) , | |
1796 _mark_in_progress(false), | |
2152 | 1797 _cg1r(NULL), _summary_bytes_used(0), |
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1798 _g1mm(NULL), |
342 | 1799 _refine_cte_cl(NULL), |
1800 _full_collection(false), | |
2152 | 1801 _free_list("Master Free List"), |
1802 _secondary_free_list("Secondary Free List"), | |
1803 _humongous_set("Master Humongous Set"), | |
1804 _free_regions_coming(false), | |
342 | 1805 _young_list(new YoungList(this)), |
1806 _gc_time_stamp(0), | |
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1807 _retained_old_gc_alloc_region(NULL), |
526 | 1808 _surviving_young_words(NULL), |
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1809 _full_collections_completed(0), |
526 | 1810 _in_cset_fast_test(NULL), |
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1811 _in_cset_fast_test_base(NULL), |
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1812 _dirty_cards_region_list(NULL) { |
342 | 1813 _g1h = this; // To catch bugs. |
1814 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1815 vm_exit_during_initialization("Failed necessary allocation."); | |
1816 } | |
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1817 |
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1818 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1819 |
342 | 1820 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1821 _task_queues = new RefToScanQueueSet(n_queues); | |
1822 | |
1823 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1824 assert(n_rem_sets > 0, "Invariant."); | |
1825 | |
1826 HeapRegionRemSetIterator** iter_arr = | |
1827 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1828 for (int i = 0; i < n_queues; i++) { | |
1829 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1830 } | |
1831 _rem_set_iterator = iter_arr; | |
1832 | |
1833 for (int i = 0; i < n_queues; i++) { | |
1834 RefToScanQueue* q = new RefToScanQueue(); | |
1835 q->initialize(); | |
1836 _task_queues->register_queue(i, q); | |
1837 } | |
1838 | |
1839 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
1840 } | |
1841 | |
1842 jint G1CollectedHeap::initialize() { | |
1166 | 1843 CollectedHeap::pre_initialize(); |
342 | 1844 os::enable_vtime(); |
1845 | |
1846 // Necessary to satisfy locking discipline assertions. | |
1847 | |
1848 MutexLocker x(Heap_lock); | |
1849 | |
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1850 // We have to initialize the printer before committing the heap, as |
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1851 // it will be used then. |
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1852 _hr_printer.set_active(G1PrintHeapRegions); |
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1853 |
342 | 1854 // While there are no constraints in the GC code that HeapWordSize |
1855 // be any particular value, there are multiple other areas in the | |
1856 // system which believe this to be true (e.g. oop->object_size in some | |
1857 // cases incorrectly returns the size in wordSize units rather than | |
1858 // HeapWordSize). | |
1859 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1860 | |
1861 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1862 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1863 | |
1864 // Ensure that the sizes are properly aligned. | |
1865 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1866 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1867 | |
1868 _cg1r = new ConcurrentG1Refine(); | |
1869 | |
1870 // Reserve the maximum. | |
1871 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1872 // Includes the perm-gen. | |
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1873 |
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1874 // When compressed oops are enabled, the preferred heap base |
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1875 // is calculated by subtracting the requested size from the |
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1876 // 32Gb boundary and using the result as the base address for |
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1877 // heap reservation. If the requested size is not aligned to |
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1878 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1879 // into the ReservedHeapSpace constructor) then the actual |
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1880 // base of the reserved heap may end up differing from the |
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1881 // address that was requested (i.e. the preferred heap base). |
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1882 // If this happens then we could end up using a non-optimal |
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1883 // compressed oops mode. |
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1884 |
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1885 // Since max_byte_size is aligned to the size of a heap region (checked |
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1886 // above), we also need to align the perm gen size as it might not be. |
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1887 const size_t total_reserved = max_byte_size + |
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1888 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1889 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1890 |
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1891 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1892 |
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1893 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1894 UseLargePages, addr); |
642
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1895 |
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1896 if (UseCompressedOops) { |
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1897 if (addr != NULL && !heap_rs.is_reserved()) { |
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1898 // Failed to reserve at specified address - the requested memory |
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1899 // region is taken already, for example, by 'java' launcher. |
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1900 // Try again to reserver heap higher. |
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1901 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1902 |
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1903 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1904 UseLargePages, addr); |
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1905 |
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1906 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1907 // Failed to reserve at specified address again - give up. |
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1908 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1909 assert(addr == NULL, ""); |
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1910 |
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1911 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1912 UseLargePages, addr); |
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1913 heap_rs = heap_rs1; |
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1914 } else { |
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1915 heap_rs = heap_rs0; |
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1916 } |
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1917 } |
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1918 } |
342 | 1919 |
1920 if (!heap_rs.is_reserved()) { | |
1921 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1922 return JNI_ENOMEM; | |
1923 } | |
1924 | |
1925 // It is important to do this in a way such that concurrent readers can't | |
1926 // temporarily think somethings in the heap. (I've actually seen this | |
1927 // happen in asserts: DLD.) | |
1928 _reserved.set_word_size(0); | |
1929 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1930 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1931 | |
1932 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1933 | |
1934 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1935 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1936 set_barrier_set(rem_set()->bs()); | |
1937 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1938 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1939 } else { | |
1940 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1941 return JNI_ENOMEM; | |
1942 } | |
1943 | |
1944 // Also create a G1 rem set. | |
1861 | 1945 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
1946 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 1947 } else { |
1861 | 1948 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
1949 return JNI_ENOMEM; | |
342 | 1950 } |
1951 | |
1952 // Carve out the G1 part of the heap. | |
1953 | |
1954 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1955 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1956 g1_rs.size()/HeapWordSize); | |
1957 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1958 | |
1959 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1960 | |
1961 _g1_storage.initialize(g1_rs, 0); | |
1962 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 1963 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
1964 (HeapWord*) _g1_reserved.end(), | |
1965 _expansion_regions); | |
342 | 1966 |
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1967 // 6843694 - ensure that the maximum region index can fit |
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1968 // in the remembered set structures. |
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1969 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1970 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1971 |
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1972 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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1973 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1974 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1975 "too many cards per region"); |
807
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1976 |
2152 | 1977 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
1978 | |
342 | 1979 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
1980 heap_word_size(init_byte_size)); | |
1981 | |
1982 _g1h = this; | |
1983 | |
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1984 _in_cset_fast_test_length = max_regions(); |
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1985 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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|
1986 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1987 // We're biasing _in_cset_fast_test to avoid subtracting the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1988 // beginning of the heap every time we want to index; basically |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1989 // it's the same with what we do with the card table. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1990 _in_cset_fast_test = _in_cset_fast_test_base - |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
1991 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
1992 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1993 // Clear the _cset_fast_test bitmap in anticipation of adding |
1316cec51b4d
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|
1994 // regions to the incremental collection set for the first |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
1995 // evacuation pause. |
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diff
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|
1996 clear_cset_fast_test(); |
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|
1997 |
342 | 1998 // Create the ConcurrentMark data structure and thread. |
1999 // (Must do this late, so that "max_regions" is defined.) | |
2000 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2001 _cmThread = _cm->cmThread(); | |
2002 | |
2003 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2004 HeapRegionRemSet::init_heap(max_regions()); | |
2005 | |
677 | 2006 // Now expand into the initial heap size. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
2007 if (!expand(init_byte_size)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
2008 vm_exit_during_initialization("Failed to allocate initial heap."); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
2009 return JNI_ENOMEM; |
c33825b68624
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parents:
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diff
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|
2010 } |
342 | 2011 |
2012 // Perform any initialization actions delegated to the policy. | |
2013 g1_policy()->init(); | |
2014 | |
2015 g1_policy()->note_start_of_mark_thread(); | |
2016 | |
2017 _refine_cte_cl = | |
2018 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2019 g1_rem_set(), | |
2020 concurrent_g1_refine()); | |
2021 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2022 | |
2023 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2024 SATB_Q_FL_lock, | |
1111 | 2025 G1SATBProcessCompletedThreshold, |
342 | 2026 Shared_SATB_Q_lock); |
794 | 2027 |
2028 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2029 DirtyCardQ_FL_lock, | |
1111 | 2030 concurrent_g1_refine()->yellow_zone(), |
2031 concurrent_g1_refine()->red_zone(), | |
794 | 2032 Shared_DirtyCardQ_lock); |
2033 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
changeset
|
2034 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
changeset
|
2035 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
2036 DirtyCardQ_FL_lock, |
1111 | 2037 -1, // never trigger processing |
2038 -1, // no limit on length | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2039 Shared_DirtyCardQ_lock, |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2040 &JavaThread::dirty_card_queue_set()); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
2041 } |
1705 | 2042 |
2043 // Initialize the card queue set used to hold cards containing | |
2044 // references into the collection set. | |
2045 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2046 DirtyCardQ_FL_lock, | |
2047 -1, // never trigger processing | |
2048 -1, // no limit on length | |
2049 Shared_DirtyCardQ_lock, | |
2050 &JavaThread::dirty_card_queue_set()); | |
2051 | |
342 | 2052 // In case we're keeping closure specialization stats, initialize those |
2053 // counts and that mechanism. | |
2054 SpecializationStats::clear(); | |
2055 | |
2056 // Do later initialization work for concurrent refinement. | |
2057 _cg1r->init(); | |
2058 | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2059 // Here we allocate the dummy full region that is required by the |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2060 // G1AllocRegion class. If we don't pass an address in the reserved |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2061 // space here, lots of asserts fire. |
3766 | 2062 |
2063 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2064 _g1_reserved.start()); | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
2065 // We'll re-use the same region whether the alloc region will |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2066 // require BOT updates or not and, if it doesn't, then a non-young |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
2067 // region will complain that it cannot support allocations without |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2068 // BOT updates. So we'll tag the dummy region as young to avoid that. |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2069 dummy_region->set_young(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2070 // Make sure it's full. |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2071 dummy_region->set_top(dummy_region->end()); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2072 G1AllocRegion::setup(this, dummy_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2073 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2074 init_mutator_alloc_region(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2075 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2076 // Do create of the monitoring and management support so that |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2077 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
2078 _g1mm = new G1MonitoringSupport(this); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
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|
2079 |
342 | 2080 return JNI_OK; |
2081 } | |
2082 | |
2083 void G1CollectedHeap::ref_processing_init() { | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2084 // Reference processing in G1 currently works as follows: |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2085 // |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2086 // * There are two reference processor instances. One is |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2087 // used to record and process discovered references |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2088 // during concurrent marking; the other is used to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2089 // record and process references during STW pauses |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2090 // (both full and incremental). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2091 // * Both ref processors need to 'span' the entire heap as |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2092 // the regions in the collection set may be dotted around. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2093 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2094 // * For the concurrent marking ref processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2095 // * Reference discovery is enabled at initial marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2096 // * Reference discovery is disabled and the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2097 // references processed etc during remarking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2098 // * Reference discovery is MT (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2099 // * Reference discovery requires a barrier (see below). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2100 // * Reference processing may or may not be MT |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2101 // (depending on the value of ParallelRefProcEnabled |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2102 // and ParallelGCThreads). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2103 // * A full GC disables reference discovery by the CM |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2104 // ref processor and abandons any entries on it's |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2105 // discovered lists. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2106 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2107 // * For the STW processor: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2108 // * Non MT discovery is enabled at the start of a full GC. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2109 // * Processing and enqueueing during a full GC is non-MT. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2110 // * During a full GC, references are processed after marking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2111 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2112 // * Discovery (may or may not be MT) is enabled at the start |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2113 // of an incremental evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2114 // * References are processed near the end of a STW evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2115 // * For both types of GC: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2116 // * Discovery is atomic - i.e. not concurrent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2117 // * Reference discovery will not need a barrier. |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2118 |
342 | 2119 SharedHeap::ref_processing_init(); |
2120 MemRegion mr = reserved_region(); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2121 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2122 // Concurrent Mark ref processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2123 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2124 new ReferenceProcessor(mr, // span |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2125 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2126 // mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2127 (int) ParallelGCThreads, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2128 // degree of mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2129 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2130 // mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2131 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2132 // degree of mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2133 false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2134 // Reference discovery is not atomic |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2135 &_is_alive_closure_cm, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2136 // is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2137 // (for efficiency/performance) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2138 true); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2139 // Setting next fields of discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2140 // lists requires a barrier. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2141 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2142 // STW ref processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2143 _ref_processor_stw = |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2144 new ReferenceProcessor(mr, // span |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2145 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2146 // mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2147 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2148 // degree of mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2149 (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2150 // mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2151 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2152 // degree of mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2153 true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2154 // Reference discovery is atomic |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2155 &_is_alive_closure_stw, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2156 // is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2157 // (for efficiency/performance) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2158 false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2159 // Setting next fields of discovered |
4dfb2df418f2
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parents:
3973
diff
changeset
|
2160 // lists requires a barrier. |
342 | 2161 } |
2162 | |
2163 size_t G1CollectedHeap::capacity() const { | |
2164 return _g1_committed.byte_size(); | |
2165 } | |
2166 | |
1705 | 2167 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2168 DirtyCardQueue* into_cset_dcq, | |
2169 bool concurrent, | |
342 | 2170 int worker_i) { |
889 | 2171 // Clean cards in the hot card cache |
1705 | 2172 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2173 |
342 | 2174 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2175 int n_completed_buffers = 0; | |
1705 | 2176 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2177 n_completed_buffers++; |
2178 } | |
2179 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2180 (double) n_completed_buffers); | |
2181 dcqs.clear_n_completed_buffers(); | |
2182 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2183 } | |
2184 | |
2185 | |
2186 // Computes the sum of the storage used by the various regions. | |
2187 | |
2188 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
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861
diff
changeset
|
2189 assert(Heap_lock->owner() != NULL, |
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
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861
diff
changeset
|
2190 "Should be owned on this thread's behalf."); |
342 | 2191 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2192 // Read only once in case it is set to NULL concurrently |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
2193 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2194 if (hr != NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
2195 result += hr->used(); |
342 | 2196 return result; |
2197 } | |
2198 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2199 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2200 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2201 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2202 } |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2203 |
342 | 2204 class SumUsedClosure: public HeapRegionClosure { |
2205 size_t _used; | |
2206 public: | |
2207 SumUsedClosure() : _used(0) {} | |
2208 bool doHeapRegion(HeapRegion* r) { | |
2209 if (!r->continuesHumongous()) { | |
2210 _used += r->used(); | |
2211 } | |
2212 return false; | |
2213 } | |
2214 size_t result() { return _used; } | |
2215 }; | |
2216 | |
2217 size_t G1CollectedHeap::recalculate_used() const { | |
2218 SumUsedClosure blk; | |
3766 | 2219 heap_region_iterate(&blk); |
342 | 2220 return blk.result(); |
2221 } | |
2222 | |
2223 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2224 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2225 // otherwise, is there space in the current allocation region? |
2226 | |
2227 // We need to store the current allocation region in a local variable | |
2228 // here. The problem is that this method doesn't take any locks and | |
2229 // there may be other threads which overwrite the current allocation | |
2230 // region field. attempt_allocation(), for example, sets it to NULL | |
2231 // and this can happen *after* the NULL check here but before the call | |
2232 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2233 // to be a problem in the optimized build, since the two loads of the | |
2234 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
2235 HeapRegion* hr = _mutator_alloc_region.get(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
2236 if (hr == NULL) { |
342 | 2237 return 0; |
2238 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2239 return hr->free(); |
342 | 2240 } |
2241 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
2242 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2243 return |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2244 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2245 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2246 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2247 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2248 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2249 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2250 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2251 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2252 // And as a result the region we'll allocate will be humongous. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2253 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2254 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2255 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2256 // Let's use the existing mechanism for the allocation |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2257 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2258 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2259 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2260 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2261 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2262 // If we can't allocate once, we probably cannot allocate |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2263 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2264 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2265 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2266 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2267 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2268 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2269 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2270 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2271 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2272 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2273 // We assume that if concurrent == true, then the caller is a |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2274 // concurrent thread that was joined the Suspendible Thread |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2275 // Set. If there's ever a cheap way to check this, we should add an |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2276 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2277 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2278 // We have already incremented _total_full_collections at the start |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2279 // of the GC, so total_full_collections() represents how many full |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2280 // collections have been started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2281 unsigned int full_collections_started = total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2282 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2283 // Given that this method is called at the end of a Full GC or of a |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2284 // concurrent cycle, and those can be nested (i.e., a Full GC can |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2285 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2286 // completed should be either one (in the case where there was no |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2287 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2288 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2289 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2290 // This is the case for the inner caller, i.e. a Full GC. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2291 assert(concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2292 (full_collections_started == _full_collections_completed + 1) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2293 (full_collections_started == _full_collections_completed + 2), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2294 err_msg("for inner caller (Full GC): full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2295 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2296 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2297 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2298 // This is the case for the outer caller, i.e. the concurrent cycle. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2299 assert(!concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2300 (full_collections_started == _full_collections_completed + 1), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2301 err_msg("for outer caller (concurrent cycle): " |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2302 "full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2303 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2304 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2305 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2306 _full_collections_completed += 1; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2307 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2308 // We need to clear the "in_progress" flag in the CM thread before |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2309 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2310 // is set) so that if a waiter requests another System.gc() it doesn't |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2311 // incorrectly see that a marking cyle is still in progress. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2312 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2313 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2314 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2315 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2316 // This notify_all() will ensure that a thread that called |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2317 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2318 // and it's waiting for a full GC to finish will be woken up. It is |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2319 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2320 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2321 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2322 |
342 | 2323 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2324 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2325 GCCauseSetter gcs(this, cause); |
2326 switch (cause) { | |
2327 case GCCause::_heap_inspection: | |
2328 case GCCause::_heap_dump: { | |
2329 HandleMark hm; | |
2330 do_full_collection(false); // don't clear all soft refs | |
2331 break; | |
2332 } | |
2333 default: // XXX FIX ME | |
2334 ShouldNotReachHere(); // Unexpected use of this function | |
2335 } | |
2336 } | |
2337 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2338 void G1CollectedHeap::collect(GCCause::Cause cause) { |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2339 // The caller doesn't have the Heap_lock |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2340 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2341 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2342 unsigned int gc_count_before; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2343 unsigned int full_gc_count_before; |
342 | 2344 { |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2345 MutexLocker ml(Heap_lock); |
1973 | 2346 |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2347 // Read the GC count while holding the Heap_lock |
3fc996d4edd2
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2348 gc_count_before = SharedHeap::heap()->total_collections(); |
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2349 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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2350 } |
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2351 |
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2352 if (should_do_concurrent_full_gc(cause)) { |
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2353 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2354 // concurrent cycle. We're setting word_size to 0 which means that |
2355 // we are not requesting a post-GC allocation. | |
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2356 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2357 0, /* word_size */ |
2358 true, /* should_initiate_conc_mark */ | |
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2359 g1_policy()->max_pause_time_ms(), |
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2360 cause); |
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2361 VMThread::execute(&op); |
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2362 } else { |
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2363 if (cause == GCCause::_gc_locker |
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2364 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2365 |
1973 | 2366 // Schedule a standard evacuation pause. We're setting word_size |
2367 // to 0 which means that we are not requesting a post-GC allocation. | |
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2368 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2369 0, /* word_size */ |
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2370 false, /* should_initiate_conc_mark */ |
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2371 g1_policy()->max_pause_time_ms(), |
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2372 cause); |
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2373 VMThread::execute(&op); |
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2374 } else { |
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2375 // Schedule a Full GC. |
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2376 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2377 VMThread::execute(&op); |
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2378 } |
342 | 2379 } |
2380 } | |
2381 | |
2382 bool G1CollectedHeap::is_in(const void* p) const { | |
3766 | 2383 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
2384 if (hr != NULL) { | |
342 | 2385 return hr->is_in(p); |
2386 } else { | |
2387 return _perm_gen->as_gen()->is_in(p); | |
2388 } | |
2389 } | |
2390 | |
2391 // Iteration functions. | |
2392 | |
2393 // Iterates an OopClosure over all ref-containing fields of objects | |
2394 // within a HeapRegion. | |
2395 | |
2396 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2397 MemRegion _mr; | |
2398 OopClosure* _cl; | |
2399 public: | |
2400 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2401 : _mr(mr), _cl(cl) {} | |
2402 bool doHeapRegion(HeapRegion* r) { | |
2403 if (! r->continuesHumongous()) { | |
2404 r->oop_iterate(_cl); | |
2405 } | |
2406 return false; | |
2407 } | |
2408 }; | |
2409 | |
678 | 2410 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2411 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2412 heap_region_iterate(&blk); |
678 | 2413 if (do_perm) { |
2414 perm_gen()->oop_iterate(cl); | |
2415 } | |
342 | 2416 } |
2417 | |
678 | 2418 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2419 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2420 heap_region_iterate(&blk); |
678 | 2421 if (do_perm) { |
2422 perm_gen()->oop_iterate(cl); | |
2423 } | |
342 | 2424 } |
2425 | |
2426 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2427 | |
2428 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2429 ObjectClosure* _cl; | |
2430 public: | |
2431 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2432 bool doHeapRegion(HeapRegion* r) { | |
2433 if (! r->continuesHumongous()) { | |
2434 r->object_iterate(_cl); | |
2435 } | |
2436 return false; | |
2437 } | |
2438 }; | |
2439 | |
678 | 2440 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2441 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2442 heap_region_iterate(&blk); |
678 | 2443 if (do_perm) { |
2444 perm_gen()->object_iterate(cl); | |
2445 } | |
342 | 2446 } |
2447 | |
2448 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2449 // FIXME: is this right? | |
2450 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2451 } | |
2452 | |
2453 // Calls a SpaceClosure on a HeapRegion. | |
2454 | |
2455 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2456 SpaceClosure* _cl; | |
2457 public: | |
2458 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2459 bool doHeapRegion(HeapRegion* r) { | |
2460 _cl->do_space(r); | |
2461 return false; | |
2462 } | |
2463 }; | |
2464 | |
2465 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2466 SpaceClosureRegionClosure blk(cl); | |
3766 | 2467 heap_region_iterate(&blk); |
342 | 2468 } |
2469 | |
3766 | 2470 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2471 _hrs.iterate(cl); | |
342 | 2472 } |
2473 | |
2474 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2475 HeapRegionClosure* cl) const { |
2476 _hrs.iterate_from(r, cl); | |
342 | 2477 } |
2478 | |
2479 void | |
2480 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
2481 int worker, | |
2482 jint claim_value) { | |
355 | 2483 const size_t regions = n_regions(); |
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2484 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
355 | 2485 // try to spread out the starting points of the workers |
2486 const size_t start_index = regions / worker_num * (size_t) worker; | |
2487 | |
2488 // each worker will actually look at all regions | |
2489 for (size_t count = 0; count < regions; ++count) { | |
2490 const size_t index = (start_index + count) % regions; | |
2491 assert(0 <= index && index < regions, "sanity"); | |
2492 HeapRegion* r = region_at(index); | |
2493 // we'll ignore "continues humongous" regions (we'll process them | |
2494 // when we come across their corresponding "start humongous" | |
2495 // region) and regions already claimed | |
2496 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2497 continue; | |
2498 } | |
2499 // OK, try to claim it | |
342 | 2500 if (r->claimHeapRegion(claim_value)) { |
355 | 2501 // success! |
2502 assert(!r->continuesHumongous(), "sanity"); | |
2503 if (r->startsHumongous()) { | |
2504 // If the region is "starts humongous" we'll iterate over its | |
2505 // "continues humongous" first; in fact we'll do them | |
2506 // first. The order is important. In on case, calling the | |
2507 // closure on the "starts humongous" region might de-allocate | |
2508 // and clear all its "continues humongous" regions and, as a | |
2509 // result, we might end up processing them twice. So, we'll do | |
2510 // them first (notice: most closures will ignore them anyway) and | |
2511 // then we'll do the "starts humongous" region. | |
2512 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2513 HeapRegion* chr = region_at(ch_index); | |
2514 | |
2515 // if the region has already been claimed or it's not | |
2516 // "continues humongous" we're done | |
2517 if (chr->claim_value() == claim_value || | |
2518 !chr->continuesHumongous()) { | |
2519 break; | |
2520 } | |
2521 | |
2522 // Noone should have claimed it directly. We can given | |
2523 // that we claimed its "starts humongous" region. | |
2524 assert(chr->claim_value() != claim_value, "sanity"); | |
2525 assert(chr->humongous_start_region() == r, "sanity"); | |
2526 | |
2527 if (chr->claimHeapRegion(claim_value)) { | |
2528 // we should always be able to claim it; noone else should | |
2529 // be trying to claim this region | |
2530 | |
2531 bool res2 = cl->doHeapRegion(chr); | |
2532 assert(!res2, "Should not abort"); | |
2533 | |
2534 // Right now, this holds (i.e., no closure that actually | |
2535 // does something with "continues humongous" regions | |
2536 // clears them). We might have to weaken it in the future, | |
2537 // but let's leave these two asserts here for extra safety. | |
2538 assert(chr->continuesHumongous(), "should still be the case"); | |
2539 assert(chr->humongous_start_region() == r, "sanity"); | |
2540 } else { | |
2541 guarantee(false, "we should not reach here"); | |
2542 } | |
2543 } | |
2544 } | |
2545 | |
2546 assert(!r->continuesHumongous(), "sanity"); | |
2547 bool res = cl->doHeapRegion(r); | |
2548 assert(!res, "Should not abort"); | |
2549 } | |
2550 } | |
2551 } | |
2552 | |
390 | 2553 class ResetClaimValuesClosure: public HeapRegionClosure { |
2554 public: | |
2555 bool doHeapRegion(HeapRegion* r) { | |
2556 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2557 return false; | |
2558 } | |
2559 }; | |
2560 | |
2561 void | |
2562 G1CollectedHeap::reset_heap_region_claim_values() { | |
2563 ResetClaimValuesClosure blk; | |
2564 heap_region_iterate(&blk); | |
2565 } | |
2566 | |
355 | 2567 #ifdef ASSERT |
2568 // This checks whether all regions in the heap have the correct claim | |
2569 // value. I also piggy-backed on this a check to ensure that the | |
2570 // humongous_start_region() information on "continues humongous" | |
2571 // regions is correct. | |
2572 | |
2573 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2574 private: | |
2575 jint _claim_value; | |
2576 size_t _failures; | |
2577 HeapRegion* _sh_region; | |
2578 public: | |
2579 CheckClaimValuesClosure(jint claim_value) : | |
2580 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2581 bool doHeapRegion(HeapRegion* r) { | |
2582 if (r->claim_value() != _claim_value) { | |
2583 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2584 "claim value = %d, should be %d", | |
2585 r->bottom(), r->end(), r->claim_value(), | |
2586 _claim_value); | |
2587 ++_failures; | |
2588 } | |
2589 if (!r->isHumongous()) { | |
2590 _sh_region = NULL; | |
2591 } else if (r->startsHumongous()) { | |
2592 _sh_region = r; | |
2593 } else if (r->continuesHumongous()) { | |
2594 if (r->humongous_start_region() != _sh_region) { | |
2595 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2596 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2597 r->bottom(), r->end(), | |
2598 r->humongous_start_region(), | |
2599 _sh_region); | |
2600 ++_failures; | |
342 | 2601 } |
2602 } | |
355 | 2603 return false; |
2604 } | |
2605 size_t failures() { | |
2606 return _failures; | |
2607 } | |
2608 }; | |
2609 | |
2610 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2611 CheckClaimValuesClosure cl(claim_value); | |
2612 heap_region_iterate(&cl); | |
2613 return cl.failures() == 0; | |
2614 } | |
2615 #endif // ASSERT | |
342 | 2616 |
2617 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2618 HeapRegion* r = g1_policy()->collection_set(); | |
2619 while (r != NULL) { | |
2620 HeapRegion* next = r->next_in_collection_set(); | |
2621 if (cl->doHeapRegion(r)) { | |
2622 cl->incomplete(); | |
2623 return; | |
2624 } | |
2625 r = next; | |
2626 } | |
2627 } | |
2628 | |
2629 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2630 HeapRegionClosure *cl) { | |
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2631 if (r == NULL) { |
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2632 // The CSet is empty so there's nothing to do. |
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2633 return; |
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|
2634 } |
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2635 |
342 | 2636 assert(r->in_collection_set(), |
2637 "Start region must be a member of the collection set."); | |
2638 HeapRegion* cur = r; | |
2639 while (cur != NULL) { | |
2640 HeapRegion* next = cur->next_in_collection_set(); | |
2641 if (cl->doHeapRegion(cur) && false) { | |
2642 cl->incomplete(); | |
2643 return; | |
2644 } | |
2645 cur = next; | |
2646 } | |
2647 cur = g1_policy()->collection_set(); | |
2648 while (cur != r) { | |
2649 HeapRegion* next = cur->next_in_collection_set(); | |
2650 if (cl->doHeapRegion(cur) && false) { | |
2651 cl->incomplete(); | |
2652 return; | |
2653 } | |
2654 cur = next; | |
2655 } | |
2656 } | |
2657 | |
2658 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2659 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2660 } |
2661 | |
2662 | |
2663 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2664 Space* res = heap_region_containing(addr); | |
2665 if (res == NULL) | |
2666 res = perm_gen()->space_containing(addr); | |
2667 return res; | |
2668 } | |
2669 | |
2670 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2671 Space* sp = space_containing(addr); | |
2672 if (sp != NULL) { | |
2673 return sp->block_start(addr); | |
2674 } | |
2675 return NULL; | |
2676 } | |
2677 | |
2678 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2679 Space* sp = space_containing(addr); | |
2680 assert(sp != NULL, "block_size of address outside of heap"); | |
2681 return sp->block_size(addr); | |
2682 } | |
2683 | |
2684 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2685 Space* sp = space_containing(addr); | |
2686 return sp->block_is_obj(addr); | |
2687 } | |
2688 | |
2689 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2690 return true; | |
2691 } | |
2692 | |
2693 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2694 return HeapRegion::GrainBytes; | |
2695 } | |
2696 | |
2697 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2698 // Return the remaining space in the cur alloc region, but not less than | |
2699 // the min TLAB size. | |
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2700 |
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2701 // Also, this value can be at most the humongous object threshold, |
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2702 // since we can't allow tlabs to grow big enough to accomodate |
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2703 // humongous objects. |
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2704 |
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2705 HeapRegion* hr = _mutator_alloc_region.get(); |
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2706 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
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2707 if (hr == NULL) { |
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2708 return max_tlab_size; |
342 | 2709 } else { |
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2710 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2711 } |
2712 } | |
2713 | |
2714 size_t G1CollectedHeap::max_capacity() const { | |
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2715 return _g1_reserved.byte_size(); |
342 | 2716 } |
2717 | |
2718 jlong G1CollectedHeap::millis_since_last_gc() { | |
2719 // assert(false, "NYI"); | |
2720 return 0; | |
2721 } | |
2722 | |
2723 void G1CollectedHeap::prepare_for_verify() { | |
2724 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2725 ensure_parsability(false); | |
2726 } | |
2727 g1_rem_set()->prepare_for_verify(); | |
2728 } | |
2729 | |
2730 class VerifyLivenessOopClosure: public OopClosure { | |
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2731 G1CollectedHeap* _g1h; |
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2732 VerifyOption _vo; |
342 | 2733 public: |
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2734 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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2735 _g1h(g1h), _vo(vo) |
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2736 { } |
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2737 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2738 void do_oop( oop *p) { do_oop_work(p); } |
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2739 |
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2740 template <class T> void do_oop_work(T *p) { |
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2741 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
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2742 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
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2743 "Dead object referenced by a not dead object"); |
342 | 2744 } |
2745 }; | |
2746 | |
2747 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2748 private: |
342 | 2749 G1CollectedHeap* _g1h; |
2750 size_t _live_bytes; | |
2751 HeapRegion *_hr; | |
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2752 VerifyOption _vo; |
342 | 2753 public: |
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2754 // _vo == UsePrevMarking -> use "prev" marking information, |
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2755 // _vo == UseNextMarking -> use "next" marking information, |
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2756 // _vo == UseMarkWord -> use mark word from object header. |
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2757 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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2758 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2759 _g1h = G1CollectedHeap::heap(); |
2760 } | |
2761 void do_object(oop o) { | |
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2762 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2763 assert(o != NULL, "Huh?"); |
3772
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2764 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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2765 // If the object is alive according to the mark word, |
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2766 // then verify that the marking information agrees. |
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2767 // Note we can't verify the contra-positive of the |
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2768 // above: if the object is dead (according to the mark |
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2769 // word), it may not be marked, or may have been marked |
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2770 // but has since became dead, or may have been allocated |
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2771 // since the last marking. |
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2772 if (_vo == VerifyOption_G1UseMarkWord) { |
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2773 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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2774 } |
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2775 |
342 | 2776 o->oop_iterate(&isLive); |
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2777 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2778 size_t obj_size = o->size(); // Make sure we don't overflow |
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2779 _live_bytes += (obj_size * HeapWordSize); |
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2780 } |
342 | 2781 } |
2782 } | |
2783 size_t live_bytes() { return _live_bytes; } | |
2784 }; | |
2785 | |
2786 class PrintObjsInRegionClosure : public ObjectClosure { | |
2787 HeapRegion *_hr; | |
2788 G1CollectedHeap *_g1; | |
2789 public: | |
2790 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2791 _g1 = G1CollectedHeap::heap(); | |
2792 }; | |
2793 | |
2794 void do_object(oop o) { | |
2795 if (o != NULL) { | |
2796 HeapWord *start = (HeapWord *) o; | |
2797 size_t word_sz = o->size(); | |
2798 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2799 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2800 (void*) o, word_sz, | |
2801 _g1->isMarkedPrev(o), | |
2802 _g1->isMarkedNext(o), | |
2803 _hr->obj_allocated_since_prev_marking(o)); | |
2804 HeapWord *end = start + word_sz; | |
2805 HeapWord *cur; | |
2806 int *val; | |
2807 for (cur = start; cur < end; cur++) { | |
2808 val = (int *) cur; | |
2809 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2810 } | |
2811 } | |
2812 } | |
2813 }; | |
2814 | |
2815 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2816 private: |
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2817 bool _allow_dirty; |
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2818 bool _par; |
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2819 VerifyOption _vo; |
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2820 bool _failures; |
811 | 2821 public: |
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2822 // _vo == UsePrevMarking -> use "prev" marking information, |
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2823 // _vo == UseNextMarking -> use "next" marking information, |
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2824 // _vo == UseMarkWord -> use mark word from object header. |
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2825 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
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2826 : _allow_dirty(allow_dirty), |
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2827 _par(par), |
3772
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2828 _vo(vo), |
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2829 _failures(false) {} |
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|
2830 |
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2831 bool failures() { |
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|
2832 return _failures; |
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|
2833 } |
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2834 |
342 | 2835 bool doHeapRegion(HeapRegion* r) { |
390 | 2836 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2837 "Should be unclaimed at verify points."); | |
637
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2838 if (!r->continuesHumongous()) { |
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|
2839 bool failures = false; |
3772
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2840 r->verify(_allow_dirty, _vo, &failures); |
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2841 if (failures) { |
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|
2842 _failures = true; |
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|
2843 } else { |
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|
2844 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
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2845 r->object_iterate(¬_dead_yet_cl); |
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|
2846 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2847 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
2848 "max_live_bytes "SIZE_FORMAT" " |
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|
2849 "< calculated "SIZE_FORMAT, |
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|
2850 r->bottom(), r->end(), |
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|
2851 r->max_live_bytes(), |
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|
2852 not_dead_yet_cl.live_bytes()); |
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|
2853 _failures = true; |
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|
2854 } |
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|
2855 } |
342 | 2856 } |
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|
2857 return false; // stop the region iteration if we hit a failure |
342 | 2858 } |
2859 }; | |
2860 | |
2861 class VerifyRootsClosure: public OopsInGenClosure { | |
2862 private: | |
2863 G1CollectedHeap* _g1h; | |
3772
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|
2864 VerifyOption _vo; |
342 | 2865 bool _failures; |
2866 public: | |
3772
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|
2867 // _vo == UsePrevMarking -> use "prev" marking information, |
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2868 // _vo == UseNextMarking -> use "next" marking information, |
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|
2869 // _vo == UseMarkWord -> use mark word from object header. |
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|
2870 VerifyRootsClosure(VerifyOption vo) : |
845
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2871 _g1h(G1CollectedHeap::heap()), |
3772
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|
2872 _vo(vo), |
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|
2873 _failures(false) { } |
342 | 2874 |
2875 bool failures() { return _failures; } | |
2876 | |
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2877 template <class T> void do_oop_nv(T* p) { |
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2878 T heap_oop = oopDesc::load_heap_oop(p); |
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|
2879 if (!oopDesc::is_null(heap_oop)) { |
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|
2880 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
3772
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2881 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 2882 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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|
2883 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
3772
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|
2884 if (_vo == VerifyOption_G1UseMarkWord) { |
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|
2885 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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|
2886 } |
342 | 2887 obj->print_on(gclog_or_tty); |
2888 _failures = true; | |
2889 } | |
2890 } | |
2891 } | |
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|
2892 |
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|
2893 void do_oop(oop* p) { do_oop_nv(p); } |
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|
2894 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2895 }; |
2896 | |
390 | 2897 // This is the task used for parallel heap verification. |
2898 | |
2899 class G1ParVerifyTask: public AbstractGangTask { | |
2900 private: | |
2901 G1CollectedHeap* _g1h; | |
3772
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|
2902 bool _allow_dirty; |
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|
2903 VerifyOption _vo; |
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|
2904 bool _failures; |
390 | 2905 |
2906 public: | |
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2907 // _vo == UsePrevMarking -> use "prev" marking information, |
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2908 // _vo == UseNextMarking -> use "next" marking information, |
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2909 // _vo == UseMarkWord -> use mark word from object header. |
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2910 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 2911 AbstractGangTask("Parallel verify task"), |
845
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2912 _g1h(g1h), |
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2913 _allow_dirty(allow_dirty), |
3772
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|
2914 _vo(vo), |
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2915 _failures(false) { } |
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|
2916 |
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2917 bool failures() { |
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2918 return _failures; |
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2919 } |
390 | 2920 |
2921 void work(int worker_i) { | |
637
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|
2922 HandleMark hm; |
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|
2923 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
390 | 2924 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2925 HeapRegion::ParVerifyClaimValue); | |
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2926 if (blk.failures()) { |
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|
2927 _failures = true; |
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|
2928 } |
390 | 2929 } |
2930 }; | |
2931 | |
342 | 2932 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
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2933 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 2934 } |
2935 | |
2936 void G1CollectedHeap::verify(bool allow_dirty, | |
2937 bool silent, | |
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2938 VerifyOption vo) { |
342 | 2939 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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2940 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
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2941 VerifyRootsClosure rootsCl(vo); |
989
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2942 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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2943 |
3293
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2944 // We apply the relevant closures to all the oops in the |
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2945 // system dictionary, the string table and the code cache. |
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2946 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
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2947 |
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2948 process_strong_roots(true, // activate StrongRootsScope |
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2949 true, // we set "collecting perm gen" to true, |
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2950 // so we don't reset the dirty cards in the perm gen. |
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2951 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 2952 &rootsCl, |
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2953 &blobsCl, |
342 | 2954 &rootsCl); |
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2955 |
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2956 // If we're verifying after the marking phase of a Full GC then we can't |
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2957 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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2958 // the perm gen may be dead and hence not marked. If one of these dead |
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|
2959 // objects is considered to be a root then we may end up with a false |
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2960 // "Root location <x> points to dead ob <y>" failure. |
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2961 if (vo != VerifyOption_G1UseMarkWord) { |
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2962 // Since we used "collecting_perm_gen" == true above, we will not have |
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2963 // checked the refs from perm into the G1-collected heap. We check those |
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|
2964 // references explicitly below. Whether the relevant cards are dirty |
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|
2965 // is checked further below in the rem set verification. |
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|
2966 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
2967 perm_gen()->oop_iterate(&rootsCl); |
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|
2968 } |
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2969 bool failures = rootsCl.failures(); |
3772
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|
2970 |
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|
2971 if (vo != VerifyOption_G1UseMarkWord) { |
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2972 // If we're verifying during a full GC then the region sets |
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2973 // will have been torn down at the start of the GC. Therefore |
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|
2974 // verifying the region sets will fail. So we only verify |
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|
2975 // the region sets when not in a full GC. |
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|
2976 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
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|
2977 verify_region_sets(); |
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|
2978 } |
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|
2979 |
2152 | 2980 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 2981 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2982 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2983 "sanity check"); | |
2984 | |
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|
2985 G1ParVerifyTask task(this, allow_dirty, vo); |
390 | 2986 int n_workers = workers()->total_workers(); |
2987 set_par_threads(n_workers); | |
2988 workers()->run_task(&task); | |
2989 set_par_threads(0); | |
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|
2990 if (task.failures()) { |
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|
2991 failures = true; |
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|
2992 } |
390 | 2993 |
2994 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2995 "sanity check"); | |
2996 | |
2997 reset_heap_region_claim_values(); | |
2998 | |
2999 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3000 "sanity check"); | |
3001 } else { | |
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3002 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 3003 heap_region_iterate(&blk); |
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|
3004 if (blk.failures()) { |
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|
3005 failures = true; |
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|
3006 } |
390 | 3007 } |
2152 | 3008 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3009 rem_set()->verify(); |
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|
3010 |
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|
3011 if (failures) { |
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|
3012 gclog_or_tty->print_cr("Heap:"); |
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3013 print_on(gclog_or_tty, true /* extended */); |
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|
3014 gclog_or_tty->print_cr(""); |
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|
3015 #ifndef PRODUCT |
1044 | 3016 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3017 concurrent_mark()->print_reachable("at-verification-failure", |
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|
3018 vo, false /* all */); |
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|
3019 } |
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|
3020 #endif |
1020
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|
3021 gclog_or_tty->flush(); |
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|
3022 } |
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|
3023 guarantee(!failures, "there should not have been any failures"); |
342 | 3024 } else { |
3025 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3026 } | |
3027 } | |
3028 | |
3029 class PrintRegionClosure: public HeapRegionClosure { | |
3030 outputStream* _st; | |
3031 public: | |
3032 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3033 bool doHeapRegion(HeapRegion* r) { | |
3034 r->print_on(_st); | |
3035 return false; | |
3036 } | |
3037 }; | |
3038 | |
838
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|
3039 void G1CollectedHeap::print() const { print_on(tty); } |
342 | 3040 |
3041 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
0316eac49d5a
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|
3042 print_on(st, PrintHeapAtGCExtended); |
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|
3043 } |
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|
3044 |
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|
3045 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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|
3046 st->print(" %-20s", "garbage-first heap"); |
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|
3047 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
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|
3048 capacity()/K, used_unlocked()/K); |
838
0316eac49d5a
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|
3049 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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|
3050 _g1_storage.low_boundary(), |
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|
3051 _g1_storage.high(), |
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|
3052 _g1_storage.high_boundary()); |
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|
3053 st->cr(); |
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|
3054 st->print(" region size " SIZE_FORMAT "K, ", |
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|
3055 HeapRegion::GrainBytes/K); |
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|
3056 size_t young_regions = _young_list->length(); |
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|
3057 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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|
3058 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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|
3059 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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|
3060 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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|
3061 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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|
3062 st->cr(); |
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|
3063 perm()->as_gen()->print_on(st); |
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|
3064 if (extended) { |
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|
3065 st->cr(); |
838
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|
3066 print_on_extended(st); |
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|
3067 } |
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|
3068 } |
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|
3069 |
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|
3070 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
342 | 3071 PrintRegionClosure blk(st); |
3766 | 3072 heap_region_iterate(&blk); |
342 | 3073 } |
3074 | |
3075 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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|
3076 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3077 workers()->print_worker_threads_on(st); |
3078 } | |
3079 _cmThread->print_on(st); | |
342 | 3080 st->cr(); |
1019 | 3081 _cm->print_worker_threads_on(st); |
3082 _cg1r->print_worker_threads_on(st); | |
342 | 3083 st->cr(); |
3084 } | |
3085 | |
3086 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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|
3087 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3088 workers()->threads_do(tc); |
3089 } | |
3090 tc->do_thread(_cmThread); | |
794 | 3091 _cg1r->threads_do(tc); |
342 | 3092 } |
3093 | |
3094 void G1CollectedHeap::print_tracing_info() const { | |
3095 // We'll overload this to mean "trace GC pause statistics." | |
3096 if (TraceGen0Time || TraceGen1Time) { | |
3097 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3098 // to that. | |
3099 g1_policy()->print_tracing_info(); | |
3100 } | |
751 | 3101 if (G1SummarizeRSetStats) { |
342 | 3102 g1_rem_set()->print_summary_info(); |
3103 } | |
1282 | 3104 if (G1SummarizeConcMark) { |
342 | 3105 concurrent_mark()->print_summary_info(); |
3106 } | |
3107 g1_policy()->print_yg_surv_rate_info(); | |
3108 SpecializationStats::print(); | |
3109 } | |
3110 | |
3777
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|
3111 #ifndef PRODUCT |
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|
3112 // Helpful for debugging RSet issues. |
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|
3113 |
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|
3114 class PrintRSetsClosure : public HeapRegionClosure { |
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|
3115 private: |
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|
3116 const char* _msg; |
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|
3117 size_t _occupied_sum; |
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|
3118 |
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|
3119 public: |
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3120 bool doHeapRegion(HeapRegion* r) { |
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3121 HeapRegionRemSet* hrrs = r->rem_set(); |
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3122 size_t occupied = hrrs->occupied(); |
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3123 _occupied_sum += occupied; |
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3124 |
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3125 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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3126 HR_FORMAT_PARAMS(r)); |
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3127 if (occupied == 0) { |
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3128 gclog_or_tty->print_cr(" RSet is empty"); |
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3129 } else { |
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3130 hrrs->print(); |
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3131 } |
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3132 gclog_or_tty->print_cr("----------"); |
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3133 return false; |
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3134 } |
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3135 |
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3136 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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3137 gclog_or_tty->cr(); |
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3138 gclog_or_tty->print_cr("========================================"); |
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3139 gclog_or_tty->print_cr(msg); |
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3140 gclog_or_tty->cr(); |
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3141 } |
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3142 |
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3143 ~PrintRSetsClosure() { |
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3144 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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3145 gclog_or_tty->print_cr("========================================"); |
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3146 gclog_or_tty->cr(); |
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3147 } |
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3148 }; |
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3149 |
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3150 void G1CollectedHeap::print_cset_rsets() { |
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3151 PrintRSetsClosure cl("Printing CSet RSets"); |
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3152 collection_set_iterate(&cl); |
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3153 } |
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3154 |
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3155 void G1CollectedHeap::print_all_rsets() { |
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3156 PrintRSetsClosure cl("Printing All RSets");; |
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3157 heap_region_iterate(&cl); |
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3158 } |
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3159 #endif // PRODUCT |
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3160 |
342 | 3161 G1CollectedHeap* G1CollectedHeap::heap() { |
3162 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3163 "not a garbage-first heap"); | |
3164 return _g1h; | |
3165 } | |
3166 | |
3167 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3168 // always_do_update_barrier = false; |
342 | 3169 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3170 // Call allocation profiler | |
3171 AllocationProfiler::iterate_since_last_gc(); | |
3172 // Fill TLAB's and such | |
3173 ensure_parsability(true); | |
3174 } | |
3175 | |
3176 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3177 // FIXME: what is this about? | |
3178 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3179 // is set. | |
3180 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3181 "derived pointer present")); | |
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3182 // always_do_update_barrier = true; |
3979
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3183 |
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3184 // We have just completed a GC. Update the soft reference |
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3185 // policy with the new heap occupancy |
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3186 Universe::update_heap_info_at_gc(); |
342 | 3187 } |
3188 | |
1973 | 3189 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3190 unsigned int gc_count_before, | |
3191 bool* succeeded) { | |
3192 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3193 g1_policy()->record_stop_world_start(); |
1973 | 3194 VM_G1IncCollectionPause op(gc_count_before, |
3195 word_size, | |
3196 false, /* should_initiate_conc_mark */ | |
3197 g1_policy()->max_pause_time_ms(), | |
3198 GCCause::_g1_inc_collection_pause); | |
3199 VMThread::execute(&op); | |
3200 | |
3201 HeapWord* result = op.result(); | |
3202 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3203 assert(result == NULL || ret_succeeded, | |
3204 "the result should be NULL if the VM did not succeed"); | |
3205 *succeeded = ret_succeeded; | |
3206 | |
3207 assert_heap_not_locked(); | |
3208 return result; | |
342 | 3209 } |
3210 | |
3211 void | |
3212 G1CollectedHeap::doConcurrentMark() { | |
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3213 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3214 if (!_cmThread->in_progress()) { |
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3215 _cmThread->set_started(); |
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3216 CGC_lock->notify(); |
342 | 3217 } |
3218 } | |
3219 | |
3220 // <NEW PREDICTION> | |
3221 | |
3222 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3223 bool young) { | |
3224 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3225 } | |
3226 | |
3227 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3228 predicted_time_ms) { | |
3229 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3230 } | |
3231 | |
3232 size_t G1CollectedHeap::pending_card_num() { | |
3233 size_t extra_cards = 0; | |
3234 JavaThread *curr = Threads::first(); | |
3235 while (curr != NULL) { | |
3236 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3237 extra_cards += dcq.size(); | |
3238 curr = curr->next(); | |
3239 } | |
3240 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3241 size_t buffer_size = dcqs.buffer_size(); | |
3242 size_t buffer_num = dcqs.completed_buffers_num(); | |
3243 return buffer_size * buffer_num + extra_cards; | |
3244 } | |
3245 | |
3246 size_t G1CollectedHeap::max_pending_card_num() { | |
3247 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3248 size_t buffer_size = dcqs.buffer_size(); | |
3249 size_t buffer_num = dcqs.completed_buffers_num(); | |
3250 int thread_num = Threads::number_of_threads(); | |
3251 return (buffer_num + thread_num) * buffer_size; | |
3252 } | |
3253 | |
3254 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3255 return g1_rem_set()->cardsScanned(); |
342 | 3256 } |
3257 | |
3258 void | |
3259 G1CollectedHeap::setup_surviving_young_words() { | |
3260 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
3261 size_t array_length = g1_policy()->young_cset_length(); | |
3262 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
3263 if (_surviving_young_words == NULL) { | |
3264 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3265 "Not enough space for young surv words summary."); | |
3266 } | |
3267 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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3268 #ifdef ASSERT |
342 | 3269 for (size_t i = 0; i < array_length; ++i) { |
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3270 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3271 } |
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3272 #endif // !ASSERT |
342 | 3273 } |
3274 | |
3275 void | |
3276 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3277 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3278 size_t array_length = g1_policy()->young_cset_length(); | |
3279 for (size_t i = 0; i < array_length; ++i) | |
3280 _surviving_young_words[i] += surv_young_words[i]; | |
3281 } | |
3282 | |
3283 void | |
3284 G1CollectedHeap::cleanup_surviving_young_words() { | |
3285 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3286 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3287 _surviving_young_words = NULL; | |
3288 } | |
3289 | |
3290 // </NEW PREDICTION> | |
3291 | |
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3292 #ifdef ASSERT |
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3293 class VerifyCSetClosure: public HeapRegionClosure { |
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3294 public: |
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3295 bool doHeapRegion(HeapRegion* hr) { |
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3296 // Here we check that the CSet region's RSet is ready for parallel |
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3297 // iteration. The fields that we'll verify are only manipulated |
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3298 // when the region is part of a CSet and is collected. Afterwards, |
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3299 // we reset these fields when we clear the region's RSet (when the |
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3300 // region is freed) so they are ready when the region is |
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3301 // re-allocated. The only exception to this is if there's an |
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3302 // evacuation failure and instead of freeing the region we leave |
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3303 // it in the heap. In that case, we reset these fields during |
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|
3304 // evacuation failure handling. |
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3305 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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3306 |
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3307 // Here's a good place to add any other checks we'd like to |
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|
3308 // perform on CSet regions. |
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|
3309 return false; |
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|
3310 } |
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3311 }; |
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3312 #endif // ASSERT |
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3313 |
1709 | 3314 #if TASKQUEUE_STATS |
3315 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3316 st->print_raw_cr("GC Task Stats"); | |
3317 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3318 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3319 } | |
3320 | |
3321 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3322 print_taskqueue_stats_hdr(st); | |
3323 | |
3324 TaskQueueStats totals; | |
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3325 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3326 for (int i = 0; i < n; ++i) { |
3327 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3328 totals += task_queue(i)->stats; | |
3329 } | |
3330 st->print_raw("tot "); totals.print(st); st->cr(); | |
3331 | |
3332 DEBUG_ONLY(totals.verify()); | |
3333 } | |
3334 | |
3335 void G1CollectedHeap::reset_taskqueue_stats() { | |
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3336 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3337 for (int i = 0; i < n; ++i) { |
3338 task_queue(i)->stats.reset(); | |
3339 } | |
3340 } | |
3341 #endif // TASKQUEUE_STATS | |
3342 | |
1973 | 3343 bool |
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3344 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3345 assert_at_safepoint(true /* should_be_vm_thread */); |
3346 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3347 | |
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|
3348 if (GC_locker::check_active_before_gc()) { |
1973 | 3349 return false; |
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|
3350 } |
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3351 |
2125
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|
3352 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
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|
3353 ResourceMark rm; |
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3354 |
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3355 if (PrintHeapAtGC) { |
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3356 Universe::print_heap_before_gc(); |
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3357 } |
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|
3358 |
2152 | 3359 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
3360 verify_dirty_young_regions(); |
2152 | 3361 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3362 { |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3363 // This call will decide whether this pause is an initial-mark |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3364 // pause. If it is, during_initial_mark_pause() will return true |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3365 // for the duration of this pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3366 g1_policy()->decide_on_conc_mark_initiation(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
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|
3367 |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3368 // We do not allow initial-mark to be piggy-backed on a |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3369 // partially-young GC. |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3370 assert(!g1_policy()->during_initial_mark_pause() || |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3371 g1_policy()->full_young_gcs(), "sanity"); |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3372 |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
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|
3373 // We also do not allow partially-young GCs during marking. |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3374 assert(!mark_in_progress() || g1_policy()->full_young_gcs(), "sanity"); |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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parents:
3980
diff
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|
3375 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
3376 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3377 sprintf(verbose_str, "GC pause "); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
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|
3378 if (g1_policy()->full_young_gcs()) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
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|
3379 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
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|
3380 } else { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3381 strcat(verbose_str, "(partial)"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
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|
3382 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3383 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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|
3384 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3385 // 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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parents:
1611
diff
changeset
|
3386 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3387 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
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|
3388 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
3389 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
changeset
|
3390 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3391 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
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|
3392 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
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|
3393 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
3394 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3395 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
3396 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3397 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3398 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3399 |
2361 | 3400 // If the secondary_free_list is not empty, append it to the |
3401 // free_list. No need to wait for the cleanup operation to finish; | |
3402 // the region allocation code will check the secondary_free_list | |
3403 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3404 // set, skip this step so that the region allocation code has to | |
3405 // get entries from the secondary_free_list. | |
2152 | 3406 if (!G1StressConcRegionFreeing) { |
2361 | 3407 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3408 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
3409 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
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|
3410 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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parents:
3830
diff
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|
3411 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
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|
3412 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
changeset
|
3413 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3414 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3415 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3416 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3417 increment_total_collections(false /* full gc */); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3418 increment_gc_time_stamp(); |
342 | 3419 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
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|
3420 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
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|
3421 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
|
3422 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3423 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3424 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3425 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3426 /* option */ VerifyOption_G1UsePrevMarking); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3427 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3428 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3429 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3430 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3431 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3432 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3433 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3434 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3435 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3436 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3437 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3438 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3439 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3440 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3441 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3442 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3443 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3444 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3445 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3446 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3447 // Forget the current alloc region (we might even choose it to be part |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3448 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3449 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3450 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3451 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3452 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3453 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3454 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3455 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3456 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3457 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3458 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3459 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
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|
3460 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3461 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3462 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3463 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3464 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3465 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3466 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3467 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3468 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3469 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3470 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3471 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3472 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3473 #endif // YOUNG_LIST_VERBOSE |
342 | 3474 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3475 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3476 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3477 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3478 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3479 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3480 // We must do this before any possible evacuation that should propagate |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3481 // marks. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3482 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3483 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3484 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3485 _cm->drainAllSATBBuffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3486 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3487 g1_policy()->record_satb_drain_time(finish_mark_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3488 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3489 // Record the number of elements currently on the mark stack, so we |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3490 // only iterate over these. (Since evacuation may add to the mark |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3491 // stack, doing more exposes race conditions.) If no mark is in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3492 // progress, this will be zero. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3493 _cm->set_oops_do_bound(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3494 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3495 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3496 concurrent_mark()->newCSet(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3497 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3498 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3499 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3500 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3501 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3502 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3503 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3504 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3505 g1_policy()->choose_collection_set(target_pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3506 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3507 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3508 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3509 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3510 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3511 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3512 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3513 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3514 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3515 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3516 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3517 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3518 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3519 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3520 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3521 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3522 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3523 // We have chosen the complete collection set. If marking is |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3524 // active then, we clear the region fields of any of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3525 // concurrent marking tasks whose region fields point into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3526 // the collection set as these values will become stale. This |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3527 // will cause the owning marking threads to claim a new region |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3528 // when marking restarts. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3529 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3530 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3531 } |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3532 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3533 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3534 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3535 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3536 #endif // ASSERT |
1707 | 3537 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3538 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3539 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3540 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3541 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3542 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3543 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3544 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3545 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3546 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3547 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3548 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3549 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3550 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3551 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3552 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3553 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3554 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3555 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3556 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3557 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3558 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3559 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3560 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3561 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3562 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3563 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3564 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3565 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3566 "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
|
3567 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3568 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3569 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3570 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3571 #endif // YOUNG_LIST_VERBOSE |
342 | 3572 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3573 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3574 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3575 _young_list->last_survivor_region()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3576 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3577 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3578 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3579 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3580 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3581 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3582 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3583 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3584 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3585 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3586 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3587 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3588 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3589 set_marking_started(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3590 // CAUTION: after the doConcurrentMark() call below, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3591 // the concurrent marking thread(s) could be running |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3592 // concurrently with us. Make sure that anything after |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3593 // this point does not assume that we are the only GC thread |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3594 // running. Note: of course, the actual marking work will |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3595 // not start until the safepoint itself is released in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3596 // ConcurrentGCThread::safepoint_desynchronize(). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3597 doConcurrentMark(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3598 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3599 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3600 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3601 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3602 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3603 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3604 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3605 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3606 #endif // YOUNG_LIST_VERBOSE |
342 | 3607 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3608 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3612 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3613 size_t bytes_before = capacity(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3620 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3621 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 g1_policy()->record_pause_time_ms(pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 g1_policy()->record_collection_pause_end(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // In prepare_for_verify() below we'll need to scan the deferred |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 // the update buffers we'll probably need to scan cards on the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3637 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 // on the region is current or not, by incrementing the GC time |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 // stamp here we invalidate all the GC time stamps on all the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 // all the regions. This is a nicer way of ensuring this rather |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 prepare_for_verify(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 Universe::verify(/* allow dirty */ true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 /* silent */ false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 /* option */ VerifyOption_G1UsePrevMarking); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 // CM reference discovery will be re-enabled if necessary. |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3666 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3667 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3668 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3669 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3670 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3671 size_t bytes_before = capacity(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3672 // No need for an ergo verbose message here, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3673 // expansion_amount() does this when it returns a value > 0. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3674 if (!expand(expand_bytes)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3675 // 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
|
3676 // committed/uncommitted amount match the backing store |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3677 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3678 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
|
3679 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3680 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3681 } |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3682 |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3683 // We should do this after we potentially expand the heap so |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3684 // that all the COMMIT events are generated before the end GC |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3685 // event, and after we retire the GC alloc regions so that all |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3686 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3687 _hr_printer.end_gc(false /* full */, (size_t) total_collections()); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3688 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3689 // 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
|
3690 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3691 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3692 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3693 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3694 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3695 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3696 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3697 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3698 #endif |
342 | 3699 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3700 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3701 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3702 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3703 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3704 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
|
3705 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3706 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3707 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3708 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3709 |
3766 | 3710 _hrs.verify_optional(); |
2152 | 3711 verify_region_sets_optional(); |
3712 | |
1709 | 3713 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3714 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3715 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3716 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3717 Universe::print_heap_after_gc(); |
342 | 3718 } |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3719 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3720 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3721 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3722 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3723 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3724 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3725 } |
1973 | 3726 |
3727 return true; | |
342 | 3728 } |
3729 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3730 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3731 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3732 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3733 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3734 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3735 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3736 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3737 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3738 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3739 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3740 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3741 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3742 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3743 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3744 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3745 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3746 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3747 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3748 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3749 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3750 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3751 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3752 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3753 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3754 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
3755 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
3756 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
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|
3757 |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
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|
3758 void G1CollectedHeap::init_gc_alloc_regions() { |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3759 assert_at_safepoint(true /* should_be_vm_thread */); |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3760 |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3761 _survivor_gc_alloc_region.init(); |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
3762 _old_gc_alloc_region.init(); |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3763 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3764 _retained_old_gc_alloc_region = NULL; |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3765 |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3766 // We will discard the current GC alloc region if: |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3767 // a) it's in the collection set (it can happen!), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3768 // b) it's already full (no point in using it), |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
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|
3769 // c) it's empty (this means that it was emptied during |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3770 // a cleanup and it should be on the free list now), or |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3771 // d) it's humongous (this means that it was emptied |
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parents:
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diff
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|
3772 // during a cleanup and was added to the free list, but |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
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|
3773 // has been subseqently used to allocate a humongous |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3774 // object that may be less than the region size). |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3775 if (retained_region != NULL && |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3776 !retained_region->in_collection_set() && |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3777 !(retained_region->top() == retained_region->end()) && |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3778 !retained_region->is_empty() && |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3779 !retained_region->isHumongous()) { |
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|
3780 retained_region->set_saved_mark(); |
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|
3781 _old_gc_alloc_region.set(retained_region); |
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|
3782 _hr_printer.reuse(retained_region); |
342 | 3783 } |
3784 } | |
3785 | |
3830
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|
3786 void G1CollectedHeap::release_gc_alloc_regions() { |
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parents:
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|
3787 _survivor_gc_alloc_region.release(); |
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|
3788 // If we have an old GC alloc region to release, we'll save it in |
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|
3789 // _retained_old_gc_alloc_region. If we don't |
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|
3790 // _retained_old_gc_alloc_region will become NULL. This is what we |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3791 // want either way so no reason to check explicitly for either |
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parents:
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diff
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|
3792 // condition. |
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parents:
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changeset
|
3793 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 3794 } |
3795 | |
3830
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|
3796 void G1CollectedHeap::abandon_gc_alloc_regions() { |
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|
3797 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
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diff
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|
3798 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
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|
3799 _retained_old_gc_alloc_region = NULL; |
342 | 3800 } |
3801 | |
3802 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3803 _drain_in_progress = false; | |
3804 set_evac_failure_closure(cl); | |
3805 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3806 } | |
3807 | |
3808 void G1CollectedHeap::finalize_for_evac_failure() { | |
3809 assert(_evac_failure_scan_stack != NULL && | |
3810 _evac_failure_scan_stack->length() == 0, | |
3811 "Postcondition"); | |
3812 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3813 delete _evac_failure_scan_stack; |
342 | 3814 _evac_failure_scan_stack = NULL; |
3815 } | |
3816 | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3817 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3818 private: |
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|
3819 G1CollectedHeap* _g1; |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
changeset
|
3820 DirtyCardQueue *_dcq; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
changeset
|
3821 CardTableModRefBS* _ct_bs; |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3822 |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
changeset
|
3823 public: |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3824 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3825 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
3826 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3827 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3828 virtual void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3829 template <class T> void do_oop_work(T* p) { |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3830 assert(_from->is_in_reserved(p), "paranoia"); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3831 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3832 !_from->is_survivor()) { |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3833 size_t card_index = _ct_bs->index_for(p); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3834 if (_ct_bs->mark_card_deferred(card_index)) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3835 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
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|
3836 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
3837 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3838 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3839 }; |
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3840 |
342 | 3841 class RemoveSelfPointerClosure: public ObjectClosure { |
3842 private: | |
3843 G1CollectedHeap* _g1; | |
3844 ConcurrentMark* _cm; | |
3845 HeapRegion* _hr; | |
3846 size_t _prev_marked_bytes; | |
3847 size_t _next_marked_bytes; | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
3848 OopsInHeapRegionClosure *_cl; |
342 | 3849 public: |
2133
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7007068: G1: refine the BOT during evac failure handling
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parents:
2039
diff
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|
3850 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3851 OopsInHeapRegionClosure* cl) : |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3852 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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595
diff
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|
3853 _next_marked_bytes(0), _cl(cl) {} |
342 | 3854 |
3855 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3856 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3857 | |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
2039
diff
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|
3858 // <original comment> |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3859 // The original idea here was to coalesce evacuated and dead objects. |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3860 // However that caused complications with the block offset table (BOT). |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3861 // In particular if there were two TLABs, one of them partially refined. |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3862 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3863 // The BOT entries of the unrefined part of TLAB_2 point to the start |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
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parents:
342
diff
changeset
|
3864 // of TLAB_2. If the last object of the TLAB_1 and the first object |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
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parents:
342
diff
changeset
|
3865 // of TLAB_2 are coalesced, then the cards of the unrefined part |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3866 // would point into middle of the filler object. |
2133
2250ee17e258
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tonyp
parents:
2039
diff
changeset
|
3867 // The current approach is to not coalesce and leave the BOT contents intact. |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
2039
diff
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|
3868 // </original comment> |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3869 // |
2133
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7007068: G1: refine the BOT during evac failure handling
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parents:
2039
diff
changeset
|
3870 // We now reset the BOT when we start the object iteration over the |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
2039
diff
changeset
|
3871 // region and refine its entries for every object we come across. So |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3872 // the above comment is not really relevant and we should be able |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3873 // to coalesce dead objects if we want to. |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3874 void do_object(oop obj) { |
2133
2250ee17e258
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tonyp
parents:
2039
diff
changeset
|
3875 HeapWord* obj_addr = (HeapWord*) obj; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3876 assert(_hr->is_in(obj_addr), "sanity"); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3877 size_t obj_size = obj->size(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3878 _hr->update_bot_for_object(obj_addr, obj_size); |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3879 if (obj->is_forwarded() && obj->forwardee() == obj) { |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3880 // The object failed to move. |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3881 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3882 _cm->markPrev(obj); |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3883 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3884 _prev_marked_bytes += (obj_size * HeapWordSize); |
352
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3885 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3886 _cm->markAndGrayObjectIfNecessary(obj); |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
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342
diff
changeset
|
3887 } |
e0c09f7ec5c4
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iveresov
parents:
342
diff
changeset
|
3888 obj->set_mark(markOopDesc::prototype()); |
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
iveresov
parents:
342
diff
changeset
|
3889 // While we were processing RSet buffers during the |
e0c09f7ec5c4
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iveresov
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|
3890 // collection, we actually didn't scan any cards on the |
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3891 // collection set, since we didn't want to update remebered |
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3892 // sets with entries that point into the collection set, given |
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diff
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|
3893 // that live objects fromthe collection set are about to move |
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3894 // and such entries will be stale very soon. This change also |
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3895 // dealt with a reliability issue which involved scanning a |
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diff
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|
3896 // card in the collection set and coming across an array that |
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diff
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|
3897 // was being chunked and looking malformed. The problem is |
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|
3898 // that, if evacuation fails, we might have remembered set |
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diff
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|
3899 // entries missing given that we skipped cards on the |
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|
3900 // collection set. So, we'll recreate such entries now. |
616
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|
3901 obj->oop_iterate(_cl); |
352
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3902 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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|
3903 } else { |
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3904 // The object has been either evacuated or is dead. Fill it with a |
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|
3905 // dummy object. |
2133
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3906 MemRegion mr((HeapWord*)obj, obj_size); |
481
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3907 CollectedHeap::fill_with_object(mr); |
342 | 3908 _cm->clearRangeBothMaps(mr); |
3909 } | |
3910 } | |
3911 }; | |
3912 | |
3913 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 3914 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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3915 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3916 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3917 OopsInHeapRegionClosure *cl; |
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3918 if (G1DeferredRSUpdate) { |
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3919 cl = &deferred_update; |
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|
3920 } else { |
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|
3921 cl = &immediate_update; |
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|
3922 } |
342 | 3923 HeapRegion* cur = g1_policy()->collection_set(); |
3924 while (cur != NULL) { | |
3925 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
2133
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3926 assert(!cur->isHumongous(), "sanity"); |
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3927 |
342 | 3928 if (cur->evacuation_failed()) { |
3929 assert(cur->in_collection_set(), "bad CS"); | |
2133
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3930 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
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|
3931 |
3777
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3932 // In the common case we make sure that this is done when the |
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|
3933 // region is freed so that it is "ready-to-go" when it's |
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3934 // re-allocated. However, when evacuation failure happens, a |
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3935 // region will remain in the heap and might ultimately be added |
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|
3936 // to a CSet in the future. So we have to be careful here and |
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|
3937 // make sure the region's RSet is ready for parallel iteration |
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|
3938 // whenever this might be required in the future. |
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|
3939 cur->rem_set()->reset_for_par_iteration(); |
2133
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|
3940 cur->reset_bot(); |
616
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|
3941 cl->set_region(cur); |
342 | 3942 cur->object_iterate(&rspc); |
3943 | |
3944 // A number of manipulations to make the TAMS be the current top, | |
3945 // and the marked bytes be the ones observed in the iteration. | |
3946 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3947 // The comments below are the postconditions achieved by the | |
3948 // calls. Note especially the last such condition, which says that | |
3949 // the count of marked bytes has been properly restored. | |
3950 cur->note_start_of_marking(false); | |
3951 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3952 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
3953 // _next_marked_bytes == prev_marked_bytes. | |
3954 cur->note_end_of_marking(); | |
3955 // _prev_top_at_mark_start == top(), | |
3956 // _prev_marked_bytes == prev_marked_bytes | |
3957 } | |
3958 // If there is no mark in progress, we modified the _next variables | |
3959 // above needlessly, but harmlessly. | |
3960 if (_g1h->mark_in_progress()) { | |
3961 cur->note_start_of_marking(false); | |
3962 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3963 // _next_marked_bytes == next_marked_bytes. | |
3964 } | |
3965 | |
3966 // Now make sure the region has the right index in the sorted array. | |
3967 g1_policy()->note_change_in_marked_bytes(cur); | |
3968 } | |
3969 cur = cur->next_in_collection_set(); | |
3970 } | |
3971 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3972 | |
3973 // Now restore saved marks, if any. | |
3974 if (_objs_with_preserved_marks != NULL) { | |
3975 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
3976 guarantee(_objs_with_preserved_marks->length() == | |
3977 _preserved_marks_of_objs->length(), "Both or none."); | |
3978 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
3979 oop obj = _objs_with_preserved_marks->at(i); | |
3980 markOop m = _preserved_marks_of_objs->at(i); | |
3981 obj->set_mark(m); | |
3982 } | |
3983 // Delete the preserved marks growable arrays (allocated on the C heap). | |
3984 delete _objs_with_preserved_marks; | |
3985 delete _preserved_marks_of_objs; | |
3986 _objs_with_preserved_marks = NULL; | |
3987 _preserved_marks_of_objs = NULL; | |
3988 } | |
3989 } | |
3990 | |
3991 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
3992 _evac_failure_scan_stack->push(obj); | |
3993 } | |
3994 | |
3995 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
3996 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
3997 | |
3998 while (_evac_failure_scan_stack->length() > 0) { | |
3999 oop obj = _evac_failure_scan_stack->pop(); | |
4000 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4001 obj->oop_iterate_backwards(_evac_failure_closure); | |
4002 } | |
4003 } | |
4004 | |
4005 oop | |
4006 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3973
663cb89032b1
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4007 oop old, |
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|
4008 bool should_mark_root) { |
3323
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|
4009 assert(obj_in_cs(old), |
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|
4010 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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|
4011 (HeapWord*) old)); |
342 | 4012 markOop m = old->mark(); |
4013 oop forward_ptr = old->forward_to_atomic(old); | |
4014 if (forward_ptr == NULL) { | |
4015 // Forward-to-self succeeded. | |
3973
663cb89032b1
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|
4016 |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4017 // should_mark_root will be true when this routine is called |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4018 // from a root scanning closure during an initial mark pause. |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4019 // In this case the thread that succeeds in self-forwarding the |
663cb89032b1
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|
4020 // object is also responsible for marking the object. |
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|
4021 if (should_mark_root) { |
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|
4022 assert(!oopDesc::is_null(old), "shouldn't be"); |
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|
4023 _cm->grayRoot(old); |
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|
4024 } |
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|
4025 |
342 | 4026 if (_evac_failure_closure != cl) { |
4027 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4028 assert(!_drain_in_progress, | |
4029 "Should only be true while someone holds the lock."); | |
4030 // Set the global evac-failure closure to the current thread's. | |
4031 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4032 set_evac_failure_closure(cl); | |
4033 // Now do the common part. | |
4034 handle_evacuation_failure_common(old, m); | |
4035 // Reset to NULL. | |
4036 set_evac_failure_closure(NULL); | |
4037 } else { | |
4038 // The lock is already held, and this is recursive. | |
4039 assert(_drain_in_progress, "This should only be the recursive case."); | |
4040 handle_evacuation_failure_common(old, m); | |
4041 } | |
4042 return old; | |
4043 } else { | |
3323
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4044 // Forward-to-self failed. Either someone else managed to allocate |
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|
4045 // space for this object (old != forward_ptr) or they beat us in |
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|
4046 // self-forwarding it (old == forward_ptr). |
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|
4047 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
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|
4048 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
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|
4049 "should not be in the CSet", |
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|
4050 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4051 return forward_ptr; |
4052 } | |
4053 } | |
4054 | |
4055 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4056 set_evacuation_failed(true); | |
4057 | |
4058 preserve_mark_if_necessary(old, m); | |
4059 | |
4060 HeapRegion* r = heap_region_containing(old); | |
4061 if (!r->evacuation_failed()) { | |
4062 r->set_evacuation_failed(true); | |
3778
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|
4063 _hr_printer.evac_failure(r); |
342 | 4064 } |
4065 | |
4066 push_on_evac_failure_scan_stack(old); | |
4067 | |
4068 if (!_drain_in_progress) { | |
4069 // prevent recursion in copy_to_survivor_space() | |
4070 _drain_in_progress = true; | |
4071 drain_evac_failure_scan_stack(); | |
4072 _drain_in_progress = false; | |
4073 } | |
4074 } | |
4075 | |
4076 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
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6807801: CMS: could save/restore fewer header words during scavenge
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|
4077 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
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parents:
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diff
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|
4078 // We want to call the "for_promotion_failure" version only in the |
74ee0db180fa
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parents:
2037
diff
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|
4079 // case of a promotion failure. |
74ee0db180fa
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diff
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|
4080 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4081 if (_objs_with_preserved_marks == NULL) { |
4082 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4083 _objs_with_preserved_marks = | |
4084 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4085 _preserved_marks_of_objs = | |
4086 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4087 } | |
4088 _objs_with_preserved_marks->push(obj); | |
4089 _preserved_marks_of_objs->push(m); | |
4090 } | |
4091 } | |
4092 | |
4093 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4094 size_t word_size) { | |
3830
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|
4095 if (purpose == GCAllocForSurvived) { |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4096 HeapWord* result = survivor_attempt_allocation(word_size); |
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|
4097 if (result != NULL) { |
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|
4098 return result; |
342 | 4099 } else { |
3830
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|
4100 // Let's try to allocate in the old gen in case we can fit the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4101 // object there. |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4102 return old_attempt_allocation(word_size); |
342 | 4103 } |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4104 } else { |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4105 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4106 HeapWord* result = old_attempt_allocation(word_size); |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4107 if (result != NULL) { |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
4108 return result; |
342 | 4109 } else { |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4110 // Let's try to allocate in the survivors in case we can fit the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4111 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4112 return survivor_attempt_allocation(word_size); |
342 | 4113 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4114 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4115 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4116 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4117 // Trying to keep some compilers happy. |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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|
4118 return NULL; |
342 | 4119 } |
4120 | |
4121 #ifndef PRODUCT | |
4122 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4123 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4124 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4125 return true; | |
4126 } | |
4127 #endif // PRODUCT | |
4128 | |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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changeset
|
4129 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4130 ParGCAllocBuffer(gclab_word_size), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4131 _should_mark_objects(false), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
4132 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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changeset
|
4133 _retired(false) |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
4134 { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4135 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4136 // mark the forwarded location of an evacuated object. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4137 // We set _should_mark_objects to true if marking is active, i.e. when we |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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changeset
|
4138 // need to propagate a mark, or during an initial mark pause, i.e. when we |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4139 // need to mark objects immediately reachable by the roots. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4140 if (G1CollectedHeap::heap()->mark_in_progress() || |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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changeset
|
4141 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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changeset
|
4142 _should_mark_objects = true; |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4143 } |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4144 } |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4145 |
845
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parents:
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changeset
|
4146 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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4147 : _g1h(g1h), |
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|
4148 _refs(g1h->task_queue(queue_num)), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4149 _dcq(&g1h->dirty_card_queue_set()), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4150 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4151 _g1_rem(g1h->g1_rem_set()), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4152 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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changeset
|
4153 _term_attempts(0), |
1391
79e419e5ea3b
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apetrusenko
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|
4154 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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|
4155 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4156 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4157 _strong_roots_time(0), _term_time(0), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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changeset
|
4158 _alloc_buffer_waste(0), _undo_waste(0) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4159 { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4160 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4161 // we "sacrifice" entry 0 to keep track of surviving bytes for |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4162 // non-young regions (where the age is -1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
4163 // We also add a few elements at the beginning and at the end in |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4164 // an attempt to eliminate cache contention |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4165 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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changeset
|
4166 size_t array_length = PADDING_ELEM_NUM + |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4167 real_length + |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4168 PADDING_ELEM_NUM; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4169 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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|
4170 if (_surviving_young_words_base == NULL) |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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changeset
|
4171 vm_exit_out_of_memory(array_length * sizeof(size_t), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4172 "Not enough space for young surv histo."); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4173 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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changeset
|
4174 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4175 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4176 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
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diff
changeset
|
4177 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
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diff
changeset
|
4178 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4179 _start = os::elapsedTime(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
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|
4180 } |
342 | 4181 |
1709 | 4182 void |
4183 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4184 { | |
4185 st->print_raw_cr("GC Termination Stats"); | |
4186 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4187 " ------waste (KiB)------"); | |
4188 st->print_raw_cr("thr ms ms % ms % attempts" | |
4189 " total alloc undo"); | |
4190 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4191 " ------- ------- -------"); | |
4192 } | |
4193 | |
4194 void | |
4195 G1ParScanThreadState::print_termination_stats(int i, | |
4196 outputStream* const st) const | |
4197 { | |
4198 const double elapsed_ms = elapsed_time() * 1000.0; | |
4199 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4200 const double term_ms = term_time() * 1000.0; | |
4201 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4202 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4203 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4204 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4205 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4206 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4207 alloc_buffer_waste() * HeapWordSize / K, | |
4208 undo_waste() * HeapWordSize / K); | |
4209 } | |
4210 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4211 #ifdef ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4212 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4213 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4214 assert(UseCompressedOops, "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4215 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4216 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4217 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4218 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4219 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4220 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4221 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4222 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4223 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4224 if (has_partial_array_mask(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4225 // Must be in the collection set--it's already been copied. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4226 oop p = clear_partial_array_mask(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4227 assert(_g1h->obj_in_cs(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4228 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4229 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4230 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4231 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4232 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4233 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4234 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4235 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4236 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4237 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
1861
diff
changeset
|
4238 if (ref.is_narrow()) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4239 return verify_ref((narrowOop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4240 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
1861
diff
changeset
|
4241 return verify_ref((oop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4242 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4243 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
1861
diff
changeset
|
4244 #endif // ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4245 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4246 void G1ParScanThreadState::trim_queue() { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4247 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4248 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4249 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4250 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4251 StarTask ref; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4252 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4253 // Drain the overflow stack first, so other threads can steal. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4254 while (refs()->pop_overflow(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4255 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4256 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4257 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4258 while (refs()->pop_local(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4259 deal_with_reference(ref); |
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4260 } |
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4261 } while (!refs()->is_empty()); |
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4262 } |
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4263 |
342 | 4264 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4265 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
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4266 _par_scan_state(par_scan_state), |
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4267 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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4268 _mark_in_progress(_g1->mark_in_progress()) { } |
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4269 |
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4270 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
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4271 // This is called from do_oop_work for objects that are not |
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4272 // in the collection set. Objects in the collection set |
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4273 // are marked after they have been evacuated. |
342 | 4274 |
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4275 T heap_oop = oopDesc::load_heap_oop(p); |
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4276 if (!oopDesc::is_null(heap_oop)) { |
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4277 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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4278 HeapWord* addr = (HeapWord*)obj; |
3323
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4279 if (_g1->is_in_g1_reserved(addr)) { |
342 | 4280 _cm->grayRoot(oop(addr)); |
3323
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4281 } |
342 | 4282 } |
4283 } | |
4284 | |
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4285 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
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4286 bool should_mark_copy) { |
342 | 4287 size_t word_sz = old->size(); |
4288 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4289 // +1 to make the -1 indexes valid... | |
4290 int young_index = from_region->young_index_in_cset()+1; | |
4291 assert( (from_region->is_young() && young_index > 0) || | |
4292 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4293 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4294 markOop m = old->mark(); | |
545 | 4295 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4296 : m->age(); | |
4297 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4298 word_sz); |
4299 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4300 oop obj = oop(obj_ptr); | |
4301 | |
4302 if (obj_ptr == NULL) { | |
4303 // This will either forward-to-self, or detect that someone else has | |
4304 // installed a forwarding pointer. | |
4305 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
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4306 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
342 | 4307 } |
4308 | |
526 | 4309 // We're going to allocate linearly, so might as well prefetch ahead. |
4310 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4311 | |
342 | 4312 oop forward_ptr = old->forward_to_atomic(obj); |
4313 if (forward_ptr == NULL) { | |
4314 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4315 if (g1p->track_object_age(alloc_purpose)) { |
4316 // We could simply do obj->incr_age(). However, this causes a | |
4317 // performance issue. obj->incr_age() will first check whether | |
4318 // the object has a displaced mark by checking its mark word; | |
4319 // getting the mark word from the new location of the object | |
4320 // stalls. So, given that we already have the mark word and we | |
4321 // are about to install it anyway, it's better to increase the | |
4322 // age on the mark word, when the object does not have a | |
4323 // displaced mark word. We're not expecting many objects to have | |
4324 // a displaced marked word, so that case is not optimized | |
4325 // further (it could be...) and we simply call obj->incr_age(). | |
4326 | |
4327 if (m->has_displaced_mark_helper()) { | |
4328 // in this case, we have to install the mark word first, | |
4329 // otherwise obj looks to be forwarded (the old mark word, | |
4330 // which contains the forward pointer, was copied) | |
4331 obj->set_mark(m); | |
4332 obj->incr_age(); | |
4333 } else { | |
4334 m = m->incr_age(); | |
545 | 4335 obj->set_mark(m); |
526 | 4336 } |
545 | 4337 _par_scan_state->age_table()->add(obj, word_sz); |
4338 } else { | |
4339 obj->set_mark(m); | |
526 | 4340 } |
4341 | |
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4342 // Mark the evacuated object or propagate "next" mark bit |
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4343 if (should_mark_copy) { |
342 | 4344 if (!use_local_bitmaps || |
4345 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4346 // if we couldn't mark it on the local bitmap (this happens when | |
4347 // the object was not allocated in the GCLab), we have to bite | |
4348 // the bullet and do the standard parallel mark | |
4349 _cm->markAndGrayObjectIfNecessary(obj); | |
4350 } | |
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4351 |
342 | 4352 if (_g1->isMarkedNext(old)) { |
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4353 // Unmark the object's old location so that marking |
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4354 // doesn't think the old object is alive. |
342 | 4355 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
4356 } | |
4357 } | |
4358 | |
4359 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4360 surv_young_words[young_index] += word_sz; | |
4361 | |
4362 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4363 arrayOop(old)->set_length(0); | |
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4364 oop* old_p = set_partial_array_mask(old); |
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4365 _par_scan_state->push_on_queue(old_p); |
342 | 4366 } else { |
526 | 4367 // No point in using the slower heap_region_containing() method, |
4368 // given that we know obj is in the heap. | |
4369 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4370 obj->oop_iterate_backwards(_scanner); |
4371 } | |
4372 } else { | |
4373 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4374 obj = forward_ptr; | |
4375 } | |
4376 return obj; | |
4377 } | |
4378 | |
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4379 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
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4380 template <class T> |
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4381 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
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4382 ::do_oop_work(T* p) { |
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4383 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4384 assert(barrier != G1BarrierRS || obj != NULL, |
4385 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4386 | |
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4387 // Marking: |
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4388 // If the object is in the collection set, then the thread |
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4389 // that copies the object should mark, or propagate the |
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4390 // mark to, the evacuated object. |
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4391 // If the object is not in the collection set then we |
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4392 // should call the mark_object() method depending on the |
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4393 // value of the template parameter do_mark_object (which will |
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4394 // be true for root scanning closures during an initial mark |
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4395 // pause). |
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4396 // The mark_object() method first checks whether the object |
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4397 // is marked and, if not, attempts to mark the object. |
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4398 |
526 | 4399 // here the null check is implicit in the cset_fast_test() test |
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4400 if (_g1->in_cset_fast_test(obj)) { |
526 | 4401 if (obj->is_forwarded()) { |
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4402 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
3886
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4403 // If we are a root scanning closure during an initial |
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4404 // mark pause (i.e. do_mark_object will be true) then |
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4405 // we also need to handle marking of roots in the |
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4406 // event of an evacuation failure. In the event of an |
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4407 // evacuation failure, the object is forwarded to itself |
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4408 // and not copied. For root-scanning closures, the |
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4409 // object would be marked after a successful self-forward |
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4410 // but an object could be pointed to by both a root and non |
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4411 // root location and be self-forwarded by a non-root-scanning |
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4412 // closure. Therefore we also have to attempt to mark the |
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4413 // self-forwarded root object here. |
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4414 if (do_mark_object && obj->forwardee() == obj) { |
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4415 mark_object(p); |
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4416 } |
526 | 4417 } else { |
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4418 // During an initial mark pause, objects that are pointed to |
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4419 // by the roots need to be marked - even in the event of an |
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4420 // evacuation failure. We pass the template parameter |
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4421 // do_mark_object (which is true for root scanning closures |
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4422 // during an initial mark pause) to copy_to_survivor_space |
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4423 // which will pass it on to the evacuation failure handling |
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4424 // code. The thread that successfully self-forwards a root |
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4425 // object to itself is responsible for marking the object. |
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4426 bool should_mark_root = do_mark_object; |
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4427 |
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4428 // We need to mark the copied object if we're a root scanning |
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4429 // closure during an initial mark pause (i.e. do_mark_object |
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4430 // will be true), or the object is already marked and we need |
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4431 // to propagate the mark to the evacuated copy. |
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4432 bool should_mark_copy = do_mark_object || |
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4433 _during_initial_mark || |
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4434 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
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4435 |
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4436 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
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4437 should_mark_copy); |
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4438 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4439 } |
526 | 4440 // When scanning the RS, we only care about objs in CS. |
4441 if (barrier == G1BarrierRS) { | |
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4442 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4443 } |
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4444 } else { |
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4445 // The object is not in collection set. If we're a root scanning |
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4446 // closure during an initial mark pause (i.e. do_mark_object will |
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4447 // be true) then attempt to mark the object. |
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|
4448 if (do_mark_object) { |
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|
4449 mark_object(p); |
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4450 } |
526 | 4451 } |
4452 | |
4453 if (barrier == G1BarrierEvac && obj != NULL) { | |
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4454 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4455 } |
4456 | |
4457 if (do_gen_barrier && obj != NULL) { | |
4458 par_do_barrier(p); | |
4459 } | |
4460 } | |
4461 | |
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4462 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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4463 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
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4464 |
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4465 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4466 assert(has_partial_array_mask(p), "invariant"); |
4467 oop old = clear_partial_array_mask(p); | |
342 | 4468 assert(old->is_objArray(), "must be obj array"); |
4469 assert(old->is_forwarded(), "must be forwarded"); | |
4470 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4471 | |
4472 objArrayOop obj = objArrayOop(old->forwardee()); | |
4473 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4474 // Process ParGCArrayScanChunk elements now | |
4475 // and push the remainder back onto queue | |
4476 int start = arrayOop(old)->length(); | |
4477 int end = obj->length(); | |
4478 int remainder = end - start; | |
4479 assert(start <= end, "just checking"); | |
4480 if (remainder > 2 * ParGCArrayScanChunk) { | |
4481 // Test above combines last partial chunk with a full chunk | |
4482 end = start + ParGCArrayScanChunk; | |
4483 arrayOop(old)->set_length(end); | |
4484 // Push remainder. | |
845
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4485 oop* old_p = set_partial_array_mask(old); |
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4486 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4487 _par_scan_state->push_on_queue(old_p); |
342 | 4488 } else { |
4489 // Restore length so that the heap remains parsable in | |
4490 // case of evacuation failure. | |
4491 arrayOop(old)->set_length(end); | |
4492 } | |
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4493 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4494 // process our set of indices (include header in first chunk) |
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4495 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4496 } |
4497 | |
4498 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4499 protected: | |
4500 G1CollectedHeap* _g1h; | |
4501 G1ParScanThreadState* _par_scan_state; | |
4502 RefToScanQueueSet* _queues; | |
4503 ParallelTaskTerminator* _terminator; | |
4504 | |
4505 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4506 RefToScanQueueSet* queues() { return _queues; } | |
4507 ParallelTaskTerminator* terminator() { return _terminator; } | |
4508 | |
4509 public: | |
4510 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4511 G1ParScanThreadState* par_scan_state, | |
4512 RefToScanQueueSet* queues, | |
4513 ParallelTaskTerminator* terminator) | |
4514 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4515 _queues(queues), _terminator(terminator) {} | |
4516 | |
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4517 void do_void(); |
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4518 |
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4519 private: |
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4520 inline bool offer_termination(); |
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4521 }; |
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4522 |
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4523 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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4524 G1ParScanThreadState* const pss = par_scan_state(); |
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4525 pss->start_term_time(); |
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4526 const bool res = terminator()->offer_termination(); |
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4527 pss->end_term_time(); |
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4528 return res; |
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4529 } |
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4530 |
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4531 void G1ParEvacuateFollowersClosure::do_void() { |
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4532 StarTask stolen_task; |
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4533 G1ParScanThreadState* const pss = par_scan_state(); |
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4534 pss->trim_queue(); |
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4535 |
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4536 do { |
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4537 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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4538 assert(pss->verify_task(stolen_task), "sanity"); |
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4539 if (stolen_task.is_narrow()) { |
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4540 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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4541 } else { |
1883
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4542 pss->deal_with_reference((oop*) stolen_task); |
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4543 } |
1883
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4544 |
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4545 // We've just processed a reference and we might have made |
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4546 // available new entries on the queues. So we have to make sure |
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4547 // we drain the queues as necessary. |
342 | 4548 pss->trim_queue(); |
4549 } | |
1862
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4550 } while (!offer_termination()); |
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4551 |
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4552 pss->retire_alloc_buffers(); |
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4553 } |
342 | 4554 |
4555 class G1ParTask : public AbstractGangTask { | |
4556 protected: | |
4557 G1CollectedHeap* _g1h; | |
4558 RefToScanQueueSet *_queues; | |
4559 ParallelTaskTerminator _terminator; | |
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4560 int _n_workers; |
342 | 4561 |
4562 Mutex _stats_lock; | |
4563 Mutex* stats_lock() { return &_stats_lock; } | |
4564 | |
4565 size_t getNCards() { | |
4566 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4567 / G1BlockOffsetSharedArray::N_bytes; | |
4568 } | |
4569 | |
4570 public: | |
4571 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4572 : AbstractGangTask("G1 collection"), | |
4573 _g1h(g1h), | |
4574 _queues(task_queues), | |
4575 _terminator(workers, _queues), | |
845
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4576 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4577 _n_workers(workers) |
342 | 4578 {} |
4579 | |
4580 RefToScanQueueSet* queues() { return _queues; } | |
4581 | |
4582 RefToScanQueue *work_queue(int i) { | |
4583 return queues()->queue(i); | |
4584 } | |
4585 | |
4586 void work(int i) { | |
845
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4587 if (i >= _n_workers) return; // no work needed this round |
1611 | 4588 |
4589 double start_time_ms = os::elapsedTime() * 1000.0; | |
4590 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4591 | |
342 | 4592 ResourceMark rm; |
4593 HandleMark hm; | |
4594 | |
3979
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4595 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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4596 |
526 | 4597 G1ParScanThreadState pss(_g1h, i); |
3979
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4598 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
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4599 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
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4600 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
342 | 4601 |
4602 pss.set_evac_closure(&scan_evac_cl); | |
4603 pss.set_evac_failure_closure(&evac_failure_cl); | |
4604 pss.set_partial_scan_closure(&partial_scan_cl); | |
4605 | |
3979
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4606 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
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4607 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
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|
4608 |
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|
4609 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
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4610 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
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|
4611 |
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|
4612 OopClosure* scan_root_cl = &only_scan_root_cl; |
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4613 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
342 | 4614 |
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4615 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
3979
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4616 // We also need to mark copied objects. |
342 | 4617 scan_root_cl = &scan_mark_root_cl; |
4618 scan_perm_cl = &scan_mark_perm_cl; | |
4619 } | |
4620 | |
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4621 // The following closure is used to scan RSets looking for reference |
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|
4622 // fields that point into the collection set. The actual field iteration |
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4623 // is performed by a FilterIntoCSClosure, whose do_oop method calls the |
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|
4624 // do_oop method of the following closure. |
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|
4625 // Therefore we want to record the reference processor in the |
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|
4626 // FilterIntoCSClosure. To do so we record the STW reference |
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|
4627 // processor into the following closure and pass it to the |
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|
4628 // FilterIntoCSClosure in HeapRegionDCTOC::walk_mem_region_with_cl. |
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|
4629 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss, rp); |
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4630 |
342 | 4631 pss.start_strong_roots(); |
4632 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4633 SharedHeap::SO_AllClasses, | |
4634 scan_root_cl, | |
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4635 &push_heap_rs_cl, |
342 | 4636 scan_perm_cl, |
4637 i); | |
4638 pss.end_strong_roots(); | |
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4639 |
342 | 4640 { |
4641 double start = os::elapsedTime(); | |
4642 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4643 evac.do_void(); | |
4644 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4645 double term_ms = pss.term_time()*1000.0; | |
4646 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4647 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4648 } |
1282 | 4649 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4650 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4651 | |
4652 // Clean up any par-expanded rem sets. | |
4653 HeapRegionRemSet::par_cleanup(); | |
4654 | |
4655 if (ParallelGCVerbose) { | |
1709 | 4656 MutexLocker x(stats_lock()); |
4657 pss.print_termination_stats(i); | |
342 | 4658 } |
4659 | |
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4660 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4661 double end_time_ms = os::elapsedTime() * 1000.0; |
4662 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4663 } |
4664 }; | |
4665 | |
4666 // *** Common G1 Evacuation Stuff | |
4667 | |
1833
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4668 // This method is run in a GC worker. |
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4669 |
342 | 4670 void |
4671 G1CollectedHeap:: | |
4672 g1_process_strong_roots(bool collecting_perm_gen, | |
4673 SharedHeap::ScanningOption so, | |
4674 OopClosure* scan_non_heap_roots, | |
4675 OopsInHeapRegionClosure* scan_rs, | |
4676 OopsInGenClosure* scan_perm, | |
4677 int worker_i) { | |
3979
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4678 |
342 | 4679 // First scan the strong roots, including the perm gen. |
4680 double ext_roots_start = os::elapsedTime(); | |
4681 double closure_app_time_sec = 0.0; | |
4682 | |
4683 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4684 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4685 buf_scan_perm.set_generation(perm_gen()); | |
4686 | |
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4687 // Walk the code cache w/o buffering, because StarTask cannot handle |
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|
4688 // unaligned oop locations. |
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|
4689 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4690 |
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|
4691 process_strong_roots(false, // no scoping; this is parallel code |
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4692 collecting_perm_gen, so, |
342 | 4693 &buf_scan_non_heap_roots, |
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|
4694 &eager_scan_code_roots, |
342 | 4695 &buf_scan_perm); |
1394
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|
4696 |
3979
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4697 // Now the CM ref_processor roots. |
3823
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|
4698 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
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4699 // We need to treat the discovered reference lists of the |
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|
4700 // concurrent mark ref processor as roots and keep entries |
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4701 // (which are added by the marking threads) on them live |
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4702 // until they can be processed at the end of marking. |
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4703 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
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|
4704 } |
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|
4705 |
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4706 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4707 buf_scan_non_heap_roots.done(); |
4708 buf_scan_perm.done(); | |
3823
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4709 |
342 | 4710 double ext_roots_end = os::elapsedTime(); |
3823
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4711 |
342 | 4712 g1_policy()->reset_obj_copy_time(worker_i); |
3823
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4713 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
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4714 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4715 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
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4716 |
342 | 4717 double ext_root_time_ms = |
4718 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
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4719 |
342 | 4720 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4721 | |
4722 // Scan strong roots in mark stack. | |
4723 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4724 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4725 } | |
4726 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4727 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4728 | |
4729 // Now scan the complement of the collection set. | |
4730 if (scan_rs != NULL) { | |
4731 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4732 } | |
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4733 |
342 | 4734 _process_strong_tasks->all_tasks_completed(); |
4735 } | |
4736 | |
4737 void | |
4738 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4739 OopClosure* non_root_closure) { | |
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4740 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4741 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4742 } |
4743 | |
3979
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4744 // Weak Reference Processing support |
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4745 |
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4746 // An always "is_alive" closure that is used to preserve referents. |
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4747 // If the object is non-null then it's alive. Used in the preservation |
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4748 // of referent objects that are pointed to by reference objects |
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4749 // discovered by the CM ref processor. |
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4750 class G1AlwaysAliveClosure: public BoolObjectClosure { |
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4751 G1CollectedHeap* _g1; |
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4752 public: |
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4753 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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4754 void do_object(oop p) { assert(false, "Do not call."); } |
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4755 bool do_object_b(oop p) { |
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|
4756 if (p != NULL) { |
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|
4757 return true; |
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|
4758 } |
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|
4759 return false; |
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|
4760 } |
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|
4761 }; |
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|
4762 |
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|
4763 bool G1STWIsAliveClosure::do_object_b(oop p) { |
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4764 // An object is reachable if it is outside the collection set, |
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|
4765 // or is inside and copied. |
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4766 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
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|
4767 } |
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|
4768 |
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|
4769 // Non Copying Keep Alive closure |
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|
4770 class G1KeepAliveClosure: public OopClosure { |
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|
4771 G1CollectedHeap* _g1; |
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|
4772 public: |
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|
4773 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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|
4774 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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|
4775 void do_oop( oop* p) { |
4dfb2df418f2
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changeset
|
4776 oop obj = *p; |
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|
4777 |
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|
4778 if (_g1->obj_in_cs(obj)) { |
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|
4779 assert( obj->is_forwarded(), "invariant" ); |
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changeset
|
4780 *p = obj->forwardee(); |
4dfb2df418f2
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diff
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|
4781 } |
4dfb2df418f2
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diff
changeset
|
4782 } |
4dfb2df418f2
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|
4783 }; |
4dfb2df418f2
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changeset
|
4784 |
4dfb2df418f2
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diff
changeset
|
4785 // Copying Keep Alive closure - can be called from both |
4dfb2df418f2
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diff
changeset
|
4786 // serial and parallel code as long as different worker |
4dfb2df418f2
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diff
changeset
|
4787 // threads utilize different G1ParScanThreadState instances |
4dfb2df418f2
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diff
changeset
|
4788 // and different queues. |
4dfb2df418f2
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diff
changeset
|
4789 |
4dfb2df418f2
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changeset
|
4790 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
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diff
changeset
|
4791 G1CollectedHeap* _g1h; |
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changeset
|
4792 OopClosure* _copy_non_heap_obj_cl; |
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|
4793 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
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|
4794 G1ParScanThreadState* _par_scan_state; |
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|
4795 |
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changeset
|
4796 public: |
4dfb2df418f2
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diff
changeset
|
4797 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
4dfb2df418f2
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|
4798 OopClosure* non_heap_obj_cl, |
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changeset
|
4799 OopsInHeapRegionClosure* perm_obj_cl, |
4dfb2df418f2
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diff
changeset
|
4800 G1ParScanThreadState* pss): |
4dfb2df418f2
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diff
changeset
|
4801 _g1h(g1h), |
4dfb2df418f2
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|
4802 _copy_non_heap_obj_cl(non_heap_obj_cl), |
4dfb2df418f2
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|
4803 _copy_perm_obj_cl(perm_obj_cl), |
4dfb2df418f2
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diff
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|
4804 _par_scan_state(pss) |
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|
4805 {} |
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|
4806 |
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|
4807 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
4808 virtual void do_oop( oop* p) { do_oop_work(p); } |
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|
4809 |
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|
4810 template <class T> void do_oop_work(T* p) { |
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|
4811 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
4812 |
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|
4813 if (_g1h->obj_in_cs(obj)) { |
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diff
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|
4814 // If the referent object has been forwarded (either copied |
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diff
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|
4815 // to a new location or to itself in the event of an |
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|
4816 // evacuation failure) then we need to update the reference |
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diff
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|
4817 // field and, if both reference and referent are in the G1 |
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|
4818 // heap, update the RSet for the referent. |
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|
4819 // |
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diff
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|
4820 // If the referent has not been forwarded then we have to keep |
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|
4821 // it alive by policy. Therefore we have copy the referent. |
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|
4822 // |
4dfb2df418f2
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|
4823 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
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diff
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|
4824 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
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diff
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|
4825 // phase of reference processing) the object and it's followers |
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|
4826 // will be copied, the reference field set to point to the |
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|
4827 // new location, and the RSet updated. Otherwise we need to |
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|
4828 // use the the non-heap or perm closures directly to copy |
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|
4829 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
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|
4830 // updating the RSet. |
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diff
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|
4831 |
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|
4832 if (_g1h->is_in_g1_reserved(p)) { |
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|
4833 _par_scan_state->push_on_queue(p); |
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diff
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|
4834 } else { |
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diff
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|
4835 // The reference field is not in the G1 heap. |
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diff
changeset
|
4836 if (_g1h->perm_gen()->is_in(p)) { |
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|
4837 _copy_perm_obj_cl->do_oop(p); |
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|
4838 } else { |
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|
4839 _copy_non_heap_obj_cl->do_oop(p); |
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|
4840 } |
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|
4841 } |
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|
4842 } |
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|
4843 } |
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parents:
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diff
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|
4844 }; |
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diff
changeset
|
4845 |
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|
4846 // Serial drain queue closure. Called as the 'complete_gc' |
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parents:
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changeset
|
4847 // closure for each discovered list in some of the |
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parents:
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diff
changeset
|
4848 // reference processing phases. |
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parents:
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diff
changeset
|
4849 |
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|
4850 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
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|
4851 protected: |
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diff
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|
4852 G1CollectedHeap* _g1h; |
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|
4853 G1ParScanThreadState* _par_scan_state; |
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|
4854 |
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|
4855 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
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|
4856 |
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parents:
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diff
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|
4857 public: |
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diff
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|
4858 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
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|
4859 _g1h(g1h), |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4860 _par_scan_state(pss) |
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parents:
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diff
changeset
|
4861 { } |
4dfb2df418f2
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parents:
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diff
changeset
|
4862 |
4dfb2df418f2
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diff
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|
4863 void do_void() { |
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|
4864 G1ParScanThreadState* const pss = par_scan_state(); |
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|
4865 pss->trim_queue(); |
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|
4866 } |
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|
4867 }; |
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|
4868 |
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parents:
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diff
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|
4869 // Parallel Reference Processing closures |
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parents:
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diff
changeset
|
4870 |
4dfb2df418f2
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parents:
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diff
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|
4871 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
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parents:
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diff
changeset
|
4872 // processing during G1 evacuation pauses. |
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parents:
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diff
changeset
|
4873 |
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|
4874 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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|
4875 private: |
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parents:
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diff
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|
4876 G1CollectedHeap* _g1h; |
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parents:
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|
4877 RefToScanQueueSet* _queues; |
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|
4878 WorkGang* _workers; |
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|
4879 int _active_workers; |
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parents:
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changeset
|
4880 |
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changeset
|
4881 public: |
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diff
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|
4882 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
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|
4883 WorkGang* workers, |
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|
4884 RefToScanQueueSet *task_queues, |
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diff
changeset
|
4885 int n_workers) : |
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parents:
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diff
changeset
|
4886 _g1h(g1h), |
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parents:
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diff
changeset
|
4887 _queues(task_queues), |
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parents:
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diff
changeset
|
4888 _workers(workers), |
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parents:
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diff
changeset
|
4889 _active_workers(n_workers) |
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parents:
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diff
changeset
|
4890 { |
4dfb2df418f2
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parents:
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diff
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|
4891 assert(n_workers > 0, "shouldn't call this otherwise"); |
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parents:
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|
4892 } |
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parents:
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diff
changeset
|
4893 |
4dfb2df418f2
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parents:
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diff
changeset
|
4894 // Executes the given task using concurrent marking worker threads. |
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parents:
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diff
changeset
|
4895 virtual void execute(ProcessTask& task); |
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parents:
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diff
changeset
|
4896 virtual void execute(EnqueueTask& task); |
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parents:
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diff
changeset
|
4897 }; |
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parents:
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diff
changeset
|
4898 |
4dfb2df418f2
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parents:
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diff
changeset
|
4899 // Gang task for possibly parallel reference processing |
4dfb2df418f2
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parents:
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diff
changeset
|
4900 |
4dfb2df418f2
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|
4901 class G1STWRefProcTaskProxy: public AbstractGangTask { |
4dfb2df418f2
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parents:
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diff
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|
4902 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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parents:
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diff
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|
4903 ProcessTask& _proc_task; |
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parents:
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diff
changeset
|
4904 G1CollectedHeap* _g1h; |
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parents:
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diff
changeset
|
4905 RefToScanQueueSet *_task_queues; |
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parents:
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diff
changeset
|
4906 ParallelTaskTerminator* _terminator; |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4907 |
4dfb2df418f2
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parents:
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diff
changeset
|
4908 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
4909 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4910 G1CollectedHeap* g1h, |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4911 RefToScanQueueSet *task_queues, |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4912 ParallelTaskTerminator* terminator) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4913 AbstractGangTask("Process reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4914 _proc_task(proc_task), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4915 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4916 _task_queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4917 _terminator(terminator) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4918 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4919 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4920 virtual void work(int i) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4921 // The reference processing task executed by a single worker. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4922 ResourceMark rm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4923 HandleMark hm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4924 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4925 G1STWIsAliveClosure is_alive(_g1h); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4926 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4927 G1ParScanThreadState pss(_g1h, i); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4928 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4929 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4930 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4931 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4932 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4933 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4934 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4935 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4936 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4937 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4938 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4939 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4940 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4941 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4942 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4943 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4944 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4945 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4946 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4947 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4948 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4949 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4950 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4951 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4952 // Keep alive closure. |
4dfb2df418f2
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parents:
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diff
changeset
|
4953 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
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parents:
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diff
changeset
|
4954 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4955 // Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4956 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
4dfb2df418f2
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parents:
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diff
changeset
|
4957 |
4dfb2df418f2
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parents:
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diff
changeset
|
4958 // Call the reference processing task's work routine. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4959 _proc_task.work(i, is_alive, keep_alive, drain_queue); |
4dfb2df418f2
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parents:
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diff
changeset
|
4960 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4961 // Note we cannot assert that the refs array is empty here as not all |
4dfb2df418f2
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parents:
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diff
changeset
|
4962 // of the processing tasks (specifically phase2 - pp2_work) execute |
4dfb2df418f2
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parents:
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diff
changeset
|
4963 // the complete_gc closure (which ordinarily would drain the queue) so |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4964 // the queue may not be empty. |
4dfb2df418f2
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parents:
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diff
changeset
|
4965 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4966 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
4967 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4968 // Driver routine for parallel reference processing. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4969 // Creates an instance of the ref processing gang |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4970 // task and has the worker threads execute it. |
4dfb2df418f2
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parents:
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diff
changeset
|
4971 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4972 assert(_workers != NULL, "Need parallel worker threads."); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4973 |
4dfb2df418f2
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parents:
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diff
changeset
|
4974 ParallelTaskTerminator terminator(_active_workers, _queues); |
4dfb2df418f2
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parents:
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diff
changeset
|
4975 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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4976 |
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4977 _g1h->set_par_threads(_active_workers); |
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4978 _workers->run_task(&proc_task_proxy); |
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4979 _g1h->set_par_threads(0); |
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|
4980 } |
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|
4981 |
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4982 // Gang task for parallel reference enqueueing. |
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|
4983 |
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4984 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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4985 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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4986 EnqueueTask& _enq_task; |
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4987 |
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4988 public: |
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|
4989 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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4990 AbstractGangTask("Enqueue reference objects in parallel"), |
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4991 _enq_task(enq_task) |
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4992 { } |
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|
4993 |
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4994 virtual void work(int i) { |
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4995 _enq_task.work(i); |
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4996 } |
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4997 }; |
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4998 |
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4999 // Driver routine for parallel reference enqueing. |
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5000 // Creates an instance of the ref enqueueing gang |
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5001 // task and has the worker threads execute it. |
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5002 |
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5003 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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5004 assert(_workers != NULL, "Need parallel worker threads."); |
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5005 |
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5006 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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5007 |
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5008 _g1h->set_par_threads(_active_workers); |
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5009 _workers->run_task(&enq_task_proxy); |
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5010 _g1h->set_par_threads(0); |
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|
5011 } |
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|
5012 |
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5013 // End of weak reference support closures |
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5014 |
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5015 // Abstract task used to preserve (i.e. copy) any referent objects |
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5016 // that are in the collection set and are pointed to by reference |
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5017 // objects discovered by the CM ref processor. |
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|
5018 |
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5019 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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5020 protected: |
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5021 G1CollectedHeap* _g1h; |
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5022 RefToScanQueueSet *_queues; |
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5023 ParallelTaskTerminator _terminator; |
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|
5024 int _n_workers; |
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|
5025 |
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|
5026 public: |
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|
5027 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
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|
5028 AbstractGangTask("ParPreserveCMReferents"), |
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|
5029 _g1h(g1h), |
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|
5030 _queues(task_queues), |
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|
5031 _terminator(workers, _queues), |
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|
5032 _n_workers(workers) |
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|
5033 { } |
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|
5034 |
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|
5035 void work(int i) { |
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|
5036 ResourceMark rm; |
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|
5037 HandleMark hm; |
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|
5038 |
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|
5039 G1ParScanThreadState pss(_g1h, i); |
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5040 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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5041 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5042 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
5043 |
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|
5044 pss.set_evac_closure(&scan_evac_cl); |
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|
5045 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5046 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5047 |
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|
5048 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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|
5049 |
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|
5050 |
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|
5051 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5052 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5053 |
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|
5054 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5055 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
5056 |
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|
5057 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5058 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5059 |
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|
5060 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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diff
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|
5061 // We also need to mark copied objects. |
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diff
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|
5062 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5063 copy_perm_cl = ©_mark_perm_cl; |
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|
5064 } |
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|
5065 |
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diff
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|
5066 // Is alive closure |
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diff
changeset
|
5067 G1AlwaysAliveClosure always_alive(_g1h); |
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|
5068 |
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diff
changeset
|
5069 // Copying keep alive closure. Applied to referent objects that need |
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diff
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|
5070 // to be copied. |
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changeset
|
5071 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5072 |
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diff
changeset
|
5073 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
5074 |
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diff
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|
5075 int limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
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diff
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|
5076 int stride = MIN2(MAX2(_n_workers, 1), limit); |
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diff
changeset
|
5077 |
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diff
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|
5078 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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diff
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|
5079 // So this must be true - but assert just in case someone decides to |
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diff
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|
5080 // change the worker ids. |
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diff
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|
5081 assert(0 <= i && i < limit, "sanity"); |
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|
5082 assert(!rp->discovery_is_atomic(), "check this code"); |
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|
5083 |
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diff
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|
5084 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
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diff
changeset
|
5085 for (int idx = i; idx < limit; idx += stride) { |
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diff
changeset
|
5086 DiscoveredList& ref_list = rp->discovered_soft_refs()[idx]; |
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diff
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|
5087 |
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diff
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|
5088 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
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diff
changeset
|
5089 while (iter.has_next()) { |
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diff
changeset
|
5090 // Since discovery is not atomic for the CM ref processor, we |
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diff
changeset
|
5091 // can see some null referent objects. |
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diff
changeset
|
5092 iter.load_ptrs(DEBUG_ONLY(true)); |
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diff
changeset
|
5093 oop ref = iter.obj(); |
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diff
changeset
|
5094 |
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diff
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|
5095 // This will filter nulls. |
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diff
changeset
|
5096 if (iter.is_referent_alive()) { |
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diff
changeset
|
5097 iter.make_referent_alive(); |
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diff
changeset
|
5098 } |
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diff
changeset
|
5099 iter.move_to_next(); |
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diff
changeset
|
5100 } |
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diff
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|
5101 } |
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diff
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|
5102 |
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diff
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|
5103 // Drain the queue - which may cause stealing |
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diff
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|
5104 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
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|
5105 drain_queue.do_void(); |
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diff
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|
5106 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
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|
5107 assert(pss.refs()->is_empty(), "should be"); |
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|
5108 } |
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|
5109 }; |
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|
5110 |
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|
5111 // Weak Reference processing during an evacuation pause (part 1). |
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|
5112 void G1CollectedHeap::process_discovered_references() { |
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|
5113 double ref_proc_start = os::elapsedTime(); |
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|
5114 |
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|
5115 ReferenceProcessor* rp = _ref_processor_stw; |
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|
5116 assert(rp->discovery_enabled(), "should have been enabled"); |
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|
5117 |
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|
5118 // Any reference objects, in the collection set, that were 'discovered' |
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|
5119 // by the CM ref processor should have already been copied (either by |
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|
5120 // applying the external root copy closure to the discovered lists, or |
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|
5121 // by following an RSet entry). |
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|
5122 // |
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5123 // But some of the referents, that are in the collection set, that these |
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|
5124 // reference objects point to may not have been copied: the STW ref |
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|
5125 // processor would have seen that the reference object had already |
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|
5126 // been 'discovered' and would have skipped discovering the reference, |
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|
5127 // but would not have treated the reference object as a regular oop. |
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|
5128 // As a reult the copy closure would not have been applied to the |
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|
5129 // referent object. |
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|
5130 // |
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|
5131 // We need to explicitly copy these referent objects - the references |
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|
5132 // will be processed at the end of remarking. |
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|
5133 // |
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|
5134 // We also need to do this copying before we process the reference |
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5135 // objects discovered by the STW ref processor in case one of these |
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|
5136 // referents points to another object which is also referenced by an |
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|
5137 // object discovered by the STW ref processor. |
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|
5138 |
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|
5139 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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|
5140 workers()->total_workers() : 1); |
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changeset
|
5141 |
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|
5142 set_par_threads(n_workers); |
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|
5143 G1ParPreserveCMReferentsTask keep_cm_referents(this, n_workers, _task_queues); |
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|
5144 |
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|
5145 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
5146 workers()->run_task(&keep_cm_referents); |
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|
5147 } else { |
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diff
changeset
|
5148 keep_cm_referents.work(0); |
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diff
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|
5149 } |
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changeset
|
5150 |
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|
5151 set_par_threads(0); |
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diff
changeset
|
5152 |
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|
5153 // Closure to test whether a referent is alive. |
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|
5154 G1STWIsAliveClosure is_alive(this); |
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changeset
|
5155 |
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diff
changeset
|
5156 // Even when parallel reference processing is enabled, the processing |
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diff
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|
5157 // of JNI refs is serial and performed serially by the current thread |
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|
5158 // rather than by a worker. The following PSS will be used for processing |
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|
5159 // JNI refs. |
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diff
changeset
|
5160 |
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diff
changeset
|
5161 // Use only a single queue for this PSS. |
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diff
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|
5162 G1ParScanThreadState pss(this, 0); |
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changeset
|
5163 |
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diff
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|
5164 // We do not embed a reference processor in the copying/scanning |
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diff
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|
5165 // closures while we're actually processing the discovered |
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diff
changeset
|
5166 // reference objects. |
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changeset
|
5167 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
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|
5168 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
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|
5169 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
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changeset
|
5170 |
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|
5171 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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|
5172 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5173 pss.set_partial_scan_closure(&partial_scan_cl); |
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changeset
|
5174 |
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diff
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|
5175 assert(pss.refs()->is_empty(), "pre-condition"); |
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diff
changeset
|
5176 |
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|
5177 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
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|
5178 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
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|
5179 |
4dfb2df418f2
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diff
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|
5180 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
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|
5181 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
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|
5182 |
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diff
changeset
|
5183 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5184 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
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|
5185 |
4dfb2df418f2
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diff
changeset
|
5186 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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diff
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|
5187 // We also need to mark copied objects. |
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diff
changeset
|
5188 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5189 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
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diff
changeset
|
5190 } |
4dfb2df418f2
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diff
changeset
|
5191 |
4dfb2df418f2
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diff
changeset
|
5192 // Keep alive closure. |
4dfb2df418f2
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diff
changeset
|
5193 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
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diff
changeset
|
5194 |
4dfb2df418f2
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diff
changeset
|
5195 // Serial Complete GC closure |
4dfb2df418f2
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diff
changeset
|
5196 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
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diff
changeset
|
5197 |
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diff
changeset
|
5198 // Setup the soft refs policy... |
4dfb2df418f2
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diff
changeset
|
5199 rp->setup_policy(false); |
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diff
changeset
|
5200 |
4dfb2df418f2
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diff
changeset
|
5201 if (!rp->processing_is_mt()) { |
4dfb2df418f2
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diff
changeset
|
5202 // Serial reference processing... |
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diff
changeset
|
5203 rp->process_discovered_references(&is_alive, |
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diff
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|
5204 &keep_alive, |
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diff
changeset
|
5205 &drain_queue, |
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diff
changeset
|
5206 NULL); |
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diff
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|
5207 } else { |
4dfb2df418f2
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diff
changeset
|
5208 // Parallel reference processing |
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diff
changeset
|
5209 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
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diff
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|
5210 assert(rp->num_q() == active_workers, "sanity"); |
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diff
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|
5211 assert(active_workers <= rp->max_num_q(), "sanity"); |
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diff
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|
5212 |
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diff
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|
5213 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
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|
5214 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
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|
5215 } |
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diff
changeset
|
5216 |
4dfb2df418f2
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diff
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|
5217 // We have completed copying any necessary live referent objects |
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diff
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|
5218 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
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diff
changeset
|
5219 // retire any active alloc buffers |
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diff
changeset
|
5220 pss.retire_alloc_buffers(); |
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diff
changeset
|
5221 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
4dfb2df418f2
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diff
changeset
|
5222 |
4dfb2df418f2
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diff
changeset
|
5223 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
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diff
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|
5224 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
4dfb2df418f2
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diff
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|
5225 } |
4dfb2df418f2
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diff
changeset
|
5226 |
4dfb2df418f2
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diff
changeset
|
5227 // Weak Reference processing during an evacuation pause (part 2). |
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diff
changeset
|
5228 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
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diff
changeset
|
5229 double ref_enq_start = os::elapsedTime(); |
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diff
changeset
|
5230 |
4dfb2df418f2
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diff
changeset
|
5231 ReferenceProcessor* rp = _ref_processor_stw; |
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diff
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|
5232 assert(!rp->discovery_enabled(), "should have been disabled as part of processing"); |
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diff
changeset
|
5233 |
4dfb2df418f2
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diff
changeset
|
5234 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
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diff
changeset
|
5235 // the pending list. |
4dfb2df418f2
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diff
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|
5236 if (!rp->processing_is_mt()) { |
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|
5237 // Serial reference processing... |
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|
5238 rp->enqueue_discovered_references(); |
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|
5239 } else { |
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|
5240 // Parallel reference enqueuing |
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|
5241 |
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|
5242 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
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5243 assert(rp->num_q() == active_workers, "sanity"); |
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|
5244 assert(active_workers <= rp->max_num_q(), "sanity"); |
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|
5245 |
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|
5246 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
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5247 rp->enqueue_discovered_references(&par_task_executor); |
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|
5248 } |
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|
5249 |
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|
5250 rp->verify_no_references_recorded(); |
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|
5251 assert(!rp->discovery_enabled(), "should have been disabled"); |
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|
5252 |
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|
5253 // FIXME |
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5254 // CM's reference processing also cleans up the string and symbol tables. |
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|
5255 // Should we do that here also? We could, but it is a serial operation |
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|
5256 // and could signicantly increase the pause time. |
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|
5257 |
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|
5258 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
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5259 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
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|
5260 } |
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|
5261 |
342 | 5262 void G1CollectedHeap::evacuate_collection_set() { |
5263 set_evacuation_failed(false); | |
5264 | |
5265 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5266 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5267 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5268 | |
342 | 5269 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
5270 set_par_threads(n_workers); | |
5271 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
5272 | |
5273 init_for_evac_failure(NULL); | |
5274 | |
5275 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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|
5276 |
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|
5277 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 5278 double start_par = os::elapsedTime(); |
3979
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|
5279 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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|
5280 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 5281 // The individual threads will set their evac-failure closures. |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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diff
changeset
|
5282 StrongRootsScope srs(this); |
1709 | 5283 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
342 | 5284 workers()->run_task(&g1_par_task); |
5285 } else { | |
989
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890
diff
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|
5286 StrongRootsScope srs(this); |
342 | 5287 g1_par_task.work(0); |
5288 } | |
5289 | |
5290 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
5291 g1_policy()->record_par_time(par_time); | |
5292 set_par_threads(0); | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
5293 |
3979
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|
5294 // Process any discovered reference objects - we have |
4dfb2df418f2
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|
5295 // to do this _before_ we retire the GC alloc regions |
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|
5296 // as we may have to copy some 'reachable' referent |
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|
5297 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
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|
5298 // not copied during the pause. |
4dfb2df418f2
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diff
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|
5299 process_discovered_references(); |
4dfb2df418f2
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|
5300 |
1974
fd1d227ef1b9
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parents:
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diff
changeset
|
5301 // Weak root processing. |
fd1d227ef1b9
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parents:
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diff
changeset
|
5302 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
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johnc
parents:
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diff
changeset
|
5303 // non-perm oops then we will need to process the code blobs |
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diff
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|
5304 // here too. |
342 | 5305 { |
3979
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parents:
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diff
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|
5306 G1STWIsAliveClosure is_alive(this); |
342 | 5307 G1KeepAliveClosure keep_alive(this); |
5308 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5309 } | |
3979
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|
5310 |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5311 release_gc_alloc_regions(); |
342 | 5312 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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|
5313 |
889 | 5314 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5315 concurrent_g1_refine()->set_use_cache(true); |
5316 | |
5317 finalize_for_evac_failure(); | |
5318 | |
5319 // Must do this before removing self-forwarding pointers, which clears | |
5320 // the per-region evac-failure flags. | |
5321 concurrent_mark()->complete_marking_in_collection_set(); | |
5322 | |
5323 if (evacuation_failed()) { | |
5324 remove_self_forwarding_pointers(); | |
5325 if (PrintGCDetails) { | |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
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1718
diff
changeset
|
5326 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5327 } else if (PrintGC) { |
5328 gclog_or_tty->print("--"); | |
5329 } | |
5330 } | |
5331 | |
3979
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|
5332 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
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diff
changeset
|
5333 // reference processor's discovered lists. We need to do |
4dfb2df418f2
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|
5334 // this after the card table is cleaned (and verified) as |
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|
5335 // the act of enqueuing entries on to the pending list |
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changeset
|
5336 // will log these updates (and dirty their associated |
4dfb2df418f2
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diff
changeset
|
5337 // cards). We need these updates logged to update any |
4dfb2df418f2
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changeset
|
5338 // RSets. |
4dfb2df418f2
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diff
changeset
|
5339 enqueue_discovered_references(); |
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|
5340 |
616
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|
5341 if (G1DeferredRSUpdate) { |
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diff
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|
5342 RedirtyLoggedCardTableEntryFastClosure redirty; |
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diff
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|
5343 dirty_card_queue_set().set_closure(&redirty); |
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diff
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|
5344 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5345 |
5346 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5347 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
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diff
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|
5348 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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|
5349 } |
342 | 5350 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5351 } | |
5352 | |
2173 | 5353 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5354 size_t* pre_used, |
5355 FreeRegionList* free_list, | |
5356 HumongousRegionSet* humongous_proxy_set, | |
2173 | 5357 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5358 bool par) { |
5359 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5360 if (hr->isHumongous()) { | |
5361 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5362 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5363 } else { | |
5364 free_region(hr, pre_used, free_list, par); | |
342 | 5365 } |
2173 | 5366 } else { |
5367 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5368 } |
5369 } | |
5370 | |
2152 | 5371 void G1CollectedHeap::free_region(HeapRegion* hr, |
5372 size_t* pre_used, | |
5373 FreeRegionList* free_list, | |
5374 bool par) { | |
5375 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5376 assert(!hr->is_empty(), "the region should not be empty"); | |
5377 assert(free_list != NULL, "pre-condition"); | |
5378 | |
5379 *pre_used += hr->used(); | |
5380 hr->hr_clear(par, true /* clear_space */); | |
2432
455328d90876
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|
5381 free_list->add_as_head(hr); |
2152 | 5382 } |
5383 | |
5384 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5385 size_t* pre_used, | |
5386 FreeRegionList* free_list, | |
5387 HumongousRegionSet* humongous_proxy_set, | |
5388 bool par) { | |
5389 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5390 assert(free_list != NULL, "pre-condition"); | |
5391 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5392 | |
5393 size_t hr_used = hr->used(); | |
5394 size_t hr_capacity = hr->capacity(); | |
5395 size_t hr_pre_used = 0; | |
5396 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5397 hr->set_notHumongous(); | |
5398 free_region(hr, &hr_pre_used, free_list, par); | |
5399 | |
3766 | 5400 size_t i = hr->hrs_index() + 1; |
2152 | 5401 size_t num = 1; |
3766 | 5402 while (i < n_regions()) { |
5403 HeapRegion* curr_hr = region_at(i); | |
2152 | 5404 if (!curr_hr->continuesHumongous()) { |
5405 break; | |
5406 } | |
5407 curr_hr->set_notHumongous(); | |
5408 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5409 num += 1; | |
5410 i += 1; | |
5411 } | |
5412 assert(hr_pre_used == hr_used, | |
5413 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5414 "should be the same", hr_pre_used, hr_used)); | |
5415 *pre_used += hr_pre_used; | |
5416 } | |
5417 | |
5418 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5419 FreeRegionList* free_list, | |
5420 HumongousRegionSet* humongous_proxy_set, | |
5421 bool par) { | |
5422 if (pre_used > 0) { | |
5423 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5424 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5425 assert(_summary_bytes_used >= pre_used, |
5426 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5427 "should be >= pre_used: "SIZE_FORMAT, | |
5428 _summary_bytes_used, pre_used)); | |
342 | 5429 _summary_bytes_used -= pre_used; |
2152 | 5430 } |
5431 if (free_list != NULL && !free_list->is_empty()) { | |
5432 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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|
5433 _free_list.add_as_head(free_list); |
2152 | 5434 } |
5435 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { | |
5436 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5437 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5438 } |
5439 } | |
5440 | |
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|
5441 class G1ParCleanupCTTask : public AbstractGangTask { |
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6819065: G1: eliminate high serial card table clearing time
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diff
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|
5442 CardTableModRefBS* _ct_bs; |
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diff
changeset
|
5443 G1CollectedHeap* _g1h; |
940
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diff
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|
5444 HeapRegion* volatile _su_head; |
796
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6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
5445 public: |
29e7d79232b9
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diff
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|
5446 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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|
5447 G1CollectedHeap* g1h) : |
796
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apetrusenko
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794
diff
changeset
|
5448 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
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3824
diff
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|
5449 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
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|
5450 |
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6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5451 void work(int i) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5452 HeapRegion* r; |
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794
diff
changeset
|
5453 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5454 clear_cards(r); |
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794
diff
changeset
|
5455 } |
940
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936
diff
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|
5456 } |
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diff
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|
5457 |
796
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diff
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|
5458 void clear_cards(HeapRegion* r) { |
3830
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3824
diff
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|
5459 // Cards of the survivors should have already been dirtied. |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5460 if (!r->is_survivor()) { |
796
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794
diff
changeset
|
5461 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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794
diff
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|
5462 } |
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diff
changeset
|
5463 } |
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5464 }; |
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5465 |
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5466 #ifndef PRODUCT |
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5467 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
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5468 G1CollectedHeap* _g1h; |
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5469 CardTableModRefBS* _ct_bs; |
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5470 public: |
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5471 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
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5472 : _g1h(g1h), _ct_bs(ct_bs) { } |
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5473 virtual bool doHeapRegion(HeapRegion* r) { |
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5474 if (r->is_survivor()) { |
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5475 _g1h->verify_dirty_region(r); |
940
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5476 } else { |
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5477 _g1h->verify_not_dirty_region(r); |
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5478 } |
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5479 return false; |
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5480 } |
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5481 }; |
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5482 |
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5483 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
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5484 // All of the region should be clean. |
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5485 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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5486 MemRegion mr(hr->bottom(), hr->end()); |
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5487 ct_bs->verify_not_dirty_region(mr); |
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5488 } |
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5489 |
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5490 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
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5491 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
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5492 // dirty allocated blocks as they allocate them. The thread that |
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5493 // retires each region and replaces it with a new one will do a |
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5494 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
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5495 // not dirty that area (one less thing to have to do while holding |
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5496 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
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5497 // is dirty. |
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5498 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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5499 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
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5500 ct_bs->verify_dirty_region(mr); |
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5501 } |
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5502 |
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5503 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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5504 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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5505 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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5506 verify_dirty_region(hr); |
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5507 } |
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|
5508 } |
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|
5509 |
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5510 void G1CollectedHeap::verify_dirty_young_regions() { |
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5511 verify_dirty_young_list(_young_list->first_region()); |
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5512 verify_dirty_young_list(_young_list->first_survivor_region()); |
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5513 } |
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5514 #endif |
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5515 |
342 | 5516 void G1CollectedHeap::cleanUpCardTable() { |
5517 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5518 double start = os::elapsedTime(); | |
5519 | |
796
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5520 // Iterate over the dirty cards region list. |
3830
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diff
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|
5521 G1ParCleanupCTTask cleanup_task(ct_bs, this); |
1394
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5522 |
796
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5523 if (ParallelGCThreads > 0) { |
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5524 set_par_threads(workers()->total_workers()); |
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|
5525 workers()->run_task(&cleanup_task); |
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|
5526 set_par_threads(0); |
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|
5527 } else { |
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|
5528 while (_dirty_cards_region_list) { |
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|
5529 HeapRegion* r = _dirty_cards_region_list; |
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5530 cleanup_task.clear_cards(r); |
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|
5531 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
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5532 if (_dirty_cards_region_list == r) { |
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5533 // The last region. |
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|
5534 _dirty_cards_region_list = NULL; |
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|
5535 } |
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|
5536 r->set_next_dirty_cards_region(NULL); |
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|
5537 } |
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5538 } |
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5539 |
342 | 5540 double elapsed = os::elapsedTime() - start; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5541 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
940
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5542 #ifndef PRODUCT |
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5543 if (G1VerifyCTCleanup || VerifyAfterGC) { |
3317
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5544 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); |
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5545 heap_region_iterate(&cleanup_verifier); |
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|
5546 } |
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|
5547 #endif |
342 | 5548 } |
5549 | |
5550 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5551 size_t pre_used = 0; |
5552 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5553 | |
342 | 5554 double young_time_ms = 0.0; |
5555 double non_young_time_ms = 0.0; | |
5556 | |
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5557 // Since the collection set is a superset of the the young list, |
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5558 // all we need to do to clear the young list is clear its |
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5559 // head and length, and unlink any young regions in the code below |
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5560 _young_list->clear(); |
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5561 |
342 | 5562 G1CollectorPolicy* policy = g1_policy(); |
5563 | |
5564 double start_sec = os::elapsedTime(); | |
5565 bool non_young = true; | |
5566 | |
5567 HeapRegion* cur = cs_head; | |
5568 int age_bound = -1; | |
5569 size_t rs_lengths = 0; | |
5570 | |
5571 while (cur != NULL) { | |
2361 | 5572 assert(!is_on_master_free_list(cur), "sanity"); |
2152 | 5573 |
342 | 5574 if (non_young) { |
5575 if (cur->is_young()) { | |
5576 double end_sec = os::elapsedTime(); | |
5577 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5578 non_young_time_ms += elapsed_ms; | |
5579 | |
5580 start_sec = os::elapsedTime(); | |
5581 non_young = false; | |
5582 } | |
5583 } else { | |
2152 | 5584 double end_sec = os::elapsedTime(); |
5585 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5586 young_time_ms += elapsed_ms; | |
5587 | |
5588 start_sec = os::elapsedTime(); | |
5589 non_young = true; | |
342 | 5590 } |
5591 | |
5592 rs_lengths += cur->rem_set()->occupied(); | |
5593 | |
5594 HeapRegion* next = cur->next_in_collection_set(); | |
5595 assert(cur->in_collection_set(), "bad CS"); | |
5596 cur->set_next_in_collection_set(NULL); | |
5597 cur->set_in_collection_set(false); | |
5598 | |
5599 if (cur->is_young()) { | |
5600 int index = cur->young_index_in_cset(); | |
5601 guarantee( index != -1, "invariant" ); | |
5602 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
5603 size_t words_survived = _surviving_young_words[index]; | |
5604 cur->record_surv_words_in_group(words_survived); | |
1394
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5605 |
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5606 // At this point the we have 'popped' cur from the collection set |
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5607 // (linked via next_in_collection_set()) but it is still in the |
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5608 // young list (linked via next_young_region()). Clear the |
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5609 // _next_young_region field. |
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|
5610 cur->set_next_young_region(NULL); |
342 | 5611 } else { |
5612 int index = cur->young_index_in_cset(); | |
5613 guarantee( index == -1, "invariant" ); | |
5614 } | |
5615 | |
5616 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5617 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5618 "invariant" ); | |
5619 | |
5620 if (!cur->evacuation_failed()) { | |
5621 // And the region is empty. | |
2152 | 5622 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
5623 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
342 | 5624 } else { |
5625 cur->uninstall_surv_rate_group(); | |
5626 if (cur->is_young()) | |
5627 cur->set_young_index_in_cset(-1); | |
5628 cur->set_not_young(); | |
5629 cur->set_evacuation_failed(false); | |
5630 } | |
5631 cur = next; | |
5632 } | |
5633 | |
5634 policy->record_max_rs_lengths(rs_lengths); | |
5635 policy->cset_regions_freed(); | |
5636 | |
5637 double end_sec = os::elapsedTime(); | |
5638 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5639 if (non_young) | |
5640 non_young_time_ms += elapsed_ms; | |
5641 else | |
5642 young_time_ms += elapsed_ms; | |
5643 | |
2152 | 5644 update_sets_after_freeing_regions(pre_used, &local_free_list, |
5645 NULL /* humongous_proxy_set */, | |
5646 false /* par */); | |
342 | 5647 policy->record_young_free_cset_time_ms(young_time_ms); |
5648 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5649 } | |
5650 | |
1394
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5651 // This routine is similar to the above but does not record |
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|
5652 // any policy statistics or update free lists; we are abandoning |
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|
5653 // the current incremental collection set in preparation of a |
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|
5654 // full collection. After the full GC we will start to build up |
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|
5655 // the incremental collection set again. |
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|
5656 // This is only called when we're doing a full collection |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
5657 // and is immediately followed by the tearing down of the young list. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
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|
5658 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5659 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5660 HeapRegion* cur = cs_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5661 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5662 while (cur != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5663 HeapRegion* next = cur->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5664 assert(cur->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5665 cur->set_next_in_collection_set(NULL); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5666 cur->set_in_collection_set(false); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5667 cur->set_young_index_in_cset(-1); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5668 cur = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5669 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5670 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
5671 |
2152 | 5672 void G1CollectedHeap::set_free_regions_coming() { |
5673 if (G1ConcRegionFreeingVerbose) { | |
5674 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5675 "setting free regions coming"); | |
5676 } | |
5677 | |
5678 assert(!free_regions_coming(), "pre-condition"); | |
5679 _free_regions_coming = true; | |
342 | 5680 } |
5681 | |
2152 | 5682 void G1CollectedHeap::reset_free_regions_coming() { |
5683 { | |
5684 assert(free_regions_coming(), "pre-condition"); | |
5685 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5686 _free_regions_coming = false; | |
5687 SecondaryFreeList_lock->notify_all(); | |
5688 } | |
5689 | |
5690 if (G1ConcRegionFreeingVerbose) { | |
5691 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5692 "reset free regions coming"); | |
342 | 5693 } |
5694 } | |
5695 | |
2152 | 5696 void G1CollectedHeap::wait_while_free_regions_coming() { |
5697 // Most of the time we won't have to wait, so let's do a quick test | |
5698 // first before we take the lock. | |
5699 if (!free_regions_coming()) { | |
5700 return; | |
5701 } | |
5702 | |
5703 if (G1ConcRegionFreeingVerbose) { | |
5704 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5705 "waiting for free regions"); | |
342 | 5706 } |
5707 | |
5708 { | |
2152 | 5709 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5710 while (free_regions_coming()) { | |
5711 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5712 } |
2152 | 5713 } |
5714 | |
5715 if (G1ConcRegionFreeingVerbose) { | |
5716 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5717 "done waiting for free regions"); | |
5718 } | |
342 | 5719 } |
5720 | |
5721 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5722 assert(heap_lock_held_for_gc(), | |
5723 "the heap lock should already be held by or for this thread"); | |
5724 _young_list->push_region(hr); | |
5725 g1_policy()->set_region_short_lived(hr); | |
5726 } | |
5727 | |
5728 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5729 private: | |
5730 bool _success; | |
5731 public: | |
5732 NoYoungRegionsClosure() : _success(true) { } | |
5733 bool doHeapRegion(HeapRegion* r) { | |
5734 if (r->is_young()) { | |
5735 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5736 r->bottom(), r->end()); | |
5737 _success = false; | |
5738 } | |
5739 return false; | |
5740 } | |
5741 bool success() { return _success; } | |
5742 }; | |
5743 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
5744 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
5745 bool ret = _young_list->check_list_empty(check_sample); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5746 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5747 if (check_heap) { |
342 | 5748 NoYoungRegionsClosure closure; |
5749 heap_region_iterate(&closure); | |
5750 ret = ret && closure.success(); | |
5751 } | |
5752 | |
5753 return ret; | |
5754 } | |
5755 | |
5756 void G1CollectedHeap::empty_young_list() { | |
5757 assert(heap_lock_held_for_gc(), | |
5758 "the heap lock should already be held by or for this thread"); | |
5759 | |
5760 _young_list->empty_list(); | |
5761 } | |
5762 | |
5763 // Done at the start of full GC. | |
5764 void G1CollectedHeap::tear_down_region_lists() { | |
2152 | 5765 _free_list.remove_all(); |
342 | 5766 } |
5767 | |
5768 class RegionResetter: public HeapRegionClosure { | |
2152 | 5769 G1CollectedHeap* _g1h; |
5770 FreeRegionList _local_free_list; | |
5771 | |
342 | 5772 public: |
2152 | 5773 RegionResetter() : _g1h(G1CollectedHeap::heap()), |
5774 _local_free_list("Local Free List for RegionResetter") { } | |
5775 | |
342 | 5776 bool doHeapRegion(HeapRegion* r) { |
5777 if (r->continuesHumongous()) return false; | |
5778 if (r->top() > r->bottom()) { | |
5779 if (r->top() < r->end()) { | |
5780 Copy::fill_to_words(r->top(), | |
5781 pointer_delta(r->end(), r->top())); | |
5782 } | |
5783 } else { | |
5784 assert(r->is_empty(), "tautology"); | |
2152 | 5785 _local_free_list.add_as_tail(r); |
342 | 5786 } |
5787 return false; | |
5788 } | |
5789 | |
2152 | 5790 void update_free_lists() { |
5791 _g1h->update_sets_after_freeing_regions(0, &_local_free_list, NULL, | |
5792 false /* par */); | |
5793 } | |
342 | 5794 }; |
5795 | |
5796 // Done at the end of full GC. | |
5797 void G1CollectedHeap::rebuild_region_lists() { | |
5798 // This needs to go at the end of the full GC. | |
5799 RegionResetter rs; | |
5800 heap_region_iterate(&rs); | |
2152 | 5801 rs.update_free_lists(); |
342 | 5802 } |
5803 | |
5804 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5805 _refine_cte_cl->set_concurrent(concurrent); | |
5806 } | |
5807 | |
5808 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5809 HeapRegion* hr = heap_region_containing(p); | |
5810 if (hr == NULL) { | |
5811 return is_in_permanent(p); | |
5812 } else { | |
5813 return hr->is_in(p); | |
5814 } | |
5815 } | |
2152 | 5816 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5817 // Methods for the mutator alloc region |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5818 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5819 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5820 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5821 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5822 assert(!force || g1_policy()->can_expand_young_list(), |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5823 "if force is true we should be able to expand the young list"); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5824 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5825 if (force || !young_list_full) { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5826 HeapRegion* new_alloc_region = new_region(word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5827 false /* do_expand */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5828 if (new_alloc_region != NULL) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5829 g1_policy()->update_region_num(true /* next_is_young */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5830 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5831 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5832 return new_alloc_region; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5833 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5834 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5835 return NULL; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5836 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5837 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5838 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5839 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5840 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5841 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5842 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5843 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5844 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5845 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5846 // We update the eden sizes here, when the region is retired, |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5847 // instead of when it's allocated, since this is the point that its |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5848 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5849 g1mm()->update_eden_size(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5850 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5851 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5852 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5853 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5854 return _g1h->new_mutator_alloc_region(word_size, force); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5855 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5856 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5857 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5858 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5859 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5860 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5861 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5862 // Methods for the GC alloc regions |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5863 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5864 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5865 size_t count, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5866 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5867 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5868 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5869 if (count < g1_policy()->max_regions(ap)) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5870 HeapRegion* new_alloc_region = new_region(word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5871 true /* do_expand */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5872 if (new_alloc_region != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5873 // We really only need to do this for old regions given that we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5874 // should never scan survivors. But it doesn't hurt to do it |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5875 // for survivors too. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5876 new_alloc_region->set_saved_mark(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5877 if (ap == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5878 new_alloc_region->set_survivor(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5879 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5880 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5881 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5882 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5883 return new_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5884 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5885 g1_policy()->note_alloc_region_limit_reached(ap); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5886 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5887 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5888 return NULL; |
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5889 } |
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5890 |
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5891 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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5892 size_t allocated_bytes, |
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5893 GCAllocPurpose ap) { |
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5894 alloc_region->note_end_of_copying(); |
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5895 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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5896 if (ap == GCAllocForSurvived) { |
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5897 young_list()->add_survivor_region(alloc_region); |
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5898 } |
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5899 _hr_printer.retire(alloc_region); |
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5900 } |
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5901 |
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5902 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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5903 bool force) { |
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5904 assert(!force, "not supported for GC alloc regions"); |
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5905 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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5906 } |
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5907 |
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5908 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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5909 size_t allocated_bytes) { |
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5910 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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5911 GCAllocForSurvived); |
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5912 } |
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5913 |
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5914 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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5915 bool force) { |
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5916 assert(!force, "not supported for GC alloc regions"); |
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5917 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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5918 } |
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5919 |
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5920 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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5921 size_t allocated_bytes) { |
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5922 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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5923 GCAllocForTenured); |
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5924 } |
2433
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5925 // Heap region set verification |
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5926 |
2152 | 5927 class VerifyRegionListsClosure : public HeapRegionClosure { |
5928 private: | |
5929 HumongousRegionSet* _humongous_set; | |
5930 FreeRegionList* _free_list; | |
5931 size_t _region_count; | |
5932 | |
5933 public: | |
5934 VerifyRegionListsClosure(HumongousRegionSet* humongous_set, | |
5935 FreeRegionList* free_list) : | |
5936 _humongous_set(humongous_set), _free_list(free_list), | |
5937 _region_count(0) { } | |
5938 | |
5939 size_t region_count() { return _region_count; } | |
5940 | |
5941 bool doHeapRegion(HeapRegion* hr) { | |
5942 _region_count += 1; | |
5943 | |
5944 if (hr->continuesHumongous()) { | |
5945 return false; | |
5946 } | |
5947 | |
5948 if (hr->is_young()) { | |
5949 // TODO | |
5950 } else if (hr->startsHumongous()) { | |
5951 _humongous_set->verify_next_region(hr); | |
5952 } else if (hr->is_empty()) { | |
5953 _free_list->verify_next_region(hr); | |
5954 } | |
5955 return false; | |
5956 } | |
5957 }; | |
5958 | |
3766 | 5959 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
5960 HeapWord* bottom) { | |
5961 HeapWord* end = bottom + HeapRegion::GrainWords; | |
5962 MemRegion mr(bottom, end); | |
5963 assert(_g1_reserved.contains(mr), "invariant"); | |
5964 // This might return NULL if the allocation fails | |
5965 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
5966 } | |
5967 | |
2152 | 5968 void G1CollectedHeap::verify_region_sets() { |
5969 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
5970 | |
5971 // First, check the explicit lists. | |
5972 _free_list.verify(); | |
5973 { | |
5974 // Given that a concurrent operation might be adding regions to | |
5975 // the secondary free list we have to take the lock before | |
5976 // verifying it. | |
5977 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5978 _secondary_free_list.verify(); | |
5979 } | |
5980 _humongous_set.verify(); | |
5981 | |
5982 // If a concurrent region freeing operation is in progress it will | |
5983 // be difficult to correctly attributed any free regions we come | |
5984 // across to the correct free list given that they might belong to | |
5985 // one of several (free_list, secondary_free_list, any local lists, | |
5986 // etc.). So, if that's the case we will skip the rest of the | |
5987 // verification operation. Alternatively, waiting for the concurrent | |
5988 // operation to complete will have a non-trivial effect on the GC's | |
5989 // operation (no concurrent operation will last longer than the | |
5990 // interval between two calls to verification) and it might hide | |
5991 // any issues that we would like to catch during testing. | |
5992 if (free_regions_coming()) { | |
5993 return; | |
5994 } | |
5995 | |
2361 | 5996 // Make sure we append the secondary_free_list on the free_list so |
5997 // that all free regions we will come across can be safely | |
5998 // attributed to the free_list. | |
5999 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6000 |
6001 // Finally, make sure that the region accounting in the lists is | |
6002 // consistent with what we see in the heap. | |
6003 _humongous_set.verify_start(); | |
6004 _free_list.verify_start(); | |
6005 | |
6006 VerifyRegionListsClosure cl(&_humongous_set, &_free_list); | |
6007 heap_region_iterate(&cl); | |
6008 | |
6009 _humongous_set.verify_end(); | |
6010 _free_list.verify_end(); | |
342 | 6011 } |