Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4781:bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
Summary: Introduce a flag that is set when a heap expansion attempt during a GC fails so that we do not consantly attempt to expand the heap when it's going to fail anyway. This not only prevents the excessive ergo output (which is generated when a region allocation fails) but also avoids excessive and ultimately unsuccessful expansion attempts.
Reviewed-by: jmasa, johnc
author | tonyp |
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date | Thu, 05 Jan 2012 05:54:01 -0500 |
parents | 441e946dc1af |
children | 023652e49ac0 |
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 |
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69 // Notes on implementation of parallelism in different tasks. |
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70 // |
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71 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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72 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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73 // It does use run_task() which sets _n_workers in the task. |
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74 // G1ParTask executes g1_process_strong_roots() -> |
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75 // SharedHeap::process_strong_roots() which calls eventuall to |
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76 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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77 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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78 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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79 // |
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80 |
342 | 81 // Local to this file. |
82 | |
83 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
84 SuspendibleThreadSet* _sts; | |
85 G1RemSet* _g1rs; | |
86 ConcurrentG1Refine* _cg1r; | |
87 bool _concurrent; | |
88 public: | |
89 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
90 G1RemSet* g1rs, | |
91 ConcurrentG1Refine* cg1r) : | |
92 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
93 {} | |
94 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 95 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
96 // This path is executed by the concurrent refine or mutator threads, | |
97 // concurrently, and so we do not care if card_ptr contains references | |
98 // that point into the collection set. | |
99 assert(!oops_into_cset, "should be"); | |
100 | |
342 | 101 if (_concurrent && _sts->should_yield()) { |
102 // Caller will actually yield. | |
103 return false; | |
104 } | |
105 // Otherwise, we finished successfully; return true. | |
106 return true; | |
107 } | |
108 void set_concurrent(bool b) { _concurrent = b; } | |
109 }; | |
110 | |
111 | |
112 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
113 int _calls; | |
114 G1CollectedHeap* _g1h; | |
115 CardTableModRefBS* _ctbs; | |
116 int _histo[256]; | |
117 public: | |
118 ClearLoggedCardTableEntryClosure() : | |
119 _calls(0) | |
120 { | |
121 _g1h = G1CollectedHeap::heap(); | |
122 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
123 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
124 } | |
125 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
126 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
127 _calls++; | |
128 unsigned char* ujb = (unsigned char*)card_ptr; | |
129 int ind = (int)(*ujb); | |
130 _histo[ind]++; | |
131 *card_ptr = -1; | |
132 } | |
133 return true; | |
134 } | |
135 int calls() { return _calls; } | |
136 void print_histo() { | |
137 gclog_or_tty->print_cr("Card table value histogram:"); | |
138 for (int i = 0; i < 256; i++) { | |
139 if (_histo[i] != 0) { | |
140 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
141 } | |
142 } | |
143 } | |
144 }; | |
145 | |
146 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
147 int _calls; | |
148 G1CollectedHeap* _g1h; | |
149 CardTableModRefBS* _ctbs; | |
150 public: | |
151 RedirtyLoggedCardTableEntryClosure() : | |
152 _calls(0) | |
153 { | |
154 _g1h = G1CollectedHeap::heap(); | |
155 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
156 } | |
157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
158 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
159 _calls++; | |
160 *card_ptr = 0; | |
161 } | |
162 return true; | |
163 } | |
164 int calls() { return _calls; } | |
165 }; | |
166 | |
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167 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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168 public: |
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169 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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170 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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171 return true; |
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172 } |
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173 }; |
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174 |
342 | 175 YoungList::YoungList(G1CollectedHeap* g1h) |
176 : _g1h(g1h), _head(NULL), | |
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177 _length(0), |
342 | 178 _last_sampled_rs_lengths(0), |
545 | 179 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 180 { |
181 guarantee( check_list_empty(false), "just making sure..." ); | |
182 } | |
183 | |
184 void YoungList::push_region(HeapRegion *hr) { | |
185 assert(!hr->is_young(), "should not already be young"); | |
186 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
187 | |
188 hr->set_next_young_region(_head); | |
189 _head = hr; | |
190 | |
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191 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 192 ++_length; |
193 } | |
194 | |
195 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 196 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 197 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
198 | |
199 hr->set_next_young_region(_survivor_head); | |
200 if (_survivor_head == NULL) { | |
545 | 201 _survivor_tail = hr; |
342 | 202 } |
203 _survivor_head = hr; | |
204 ++_survivor_length; | |
205 } | |
206 | |
207 void YoungList::empty_list(HeapRegion* list) { | |
208 while (list != NULL) { | |
209 HeapRegion* next = list->get_next_young_region(); | |
210 list->set_next_young_region(NULL); | |
211 list->uninstall_surv_rate_group(); | |
212 list->set_not_young(); | |
213 list = next; | |
214 } | |
215 } | |
216 | |
217 void YoungList::empty_list() { | |
218 assert(check_list_well_formed(), "young list should be well formed"); | |
219 | |
220 empty_list(_head); | |
221 _head = NULL; | |
222 _length = 0; | |
223 | |
224 empty_list(_survivor_head); | |
225 _survivor_head = NULL; | |
545 | 226 _survivor_tail = NULL; |
342 | 227 _survivor_length = 0; |
228 | |
229 _last_sampled_rs_lengths = 0; | |
230 | |
231 assert(check_list_empty(false), "just making sure..."); | |
232 } | |
233 | |
234 bool YoungList::check_list_well_formed() { | |
235 bool ret = true; | |
236 | |
237 size_t length = 0; | |
238 HeapRegion* curr = _head; | |
239 HeapRegion* last = NULL; | |
240 while (curr != NULL) { | |
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241 if (!curr->is_young()) { |
342 | 242 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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243 "incorrectly tagged (y: %d, surv: %d)", |
342 | 244 curr->bottom(), curr->end(), |
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245 curr->is_young(), curr->is_survivor()); |
342 | 246 ret = false; |
247 } | |
248 ++length; | |
249 last = curr; | |
250 curr = curr->get_next_young_region(); | |
251 } | |
252 ret = ret && (length == _length); | |
253 | |
254 if (!ret) { | |
255 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
256 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
257 length, _length); | |
258 } | |
259 | |
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260 return ret; |
342 | 261 } |
262 | |
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263 bool YoungList::check_list_empty(bool check_sample) { |
342 | 264 bool ret = true; |
265 | |
266 if (_length != 0) { | |
267 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
268 _length); | |
269 ret = false; | |
270 } | |
271 if (check_sample && _last_sampled_rs_lengths != 0) { | |
272 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
273 ret = false; | |
274 } | |
275 if (_head != NULL) { | |
276 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
277 ret = false; | |
278 } | |
279 if (!ret) { | |
280 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
281 } | |
282 | |
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283 return ret; |
342 | 284 } |
285 | |
286 void | |
287 YoungList::rs_length_sampling_init() { | |
288 _sampled_rs_lengths = 0; | |
289 _curr = _head; | |
290 } | |
291 | |
292 bool | |
293 YoungList::rs_length_sampling_more() { | |
294 return _curr != NULL; | |
295 } | |
296 | |
297 void | |
298 YoungList::rs_length_sampling_next() { | |
299 assert( _curr != NULL, "invariant" ); | |
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300 size_t rs_length = _curr->rem_set()->occupied(); |
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301 |
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302 _sampled_rs_lengths += rs_length; |
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303 |
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304 // The current region may not yet have been added to the |
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305 // incremental collection set (it gets added when it is |
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306 // retired as the current allocation region). |
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307 if (_curr->in_collection_set()) { |
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308 // Update the collection set policy information for this region |
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309 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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310 } |
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311 |
342 | 312 _curr = _curr->get_next_young_region(); |
313 if (_curr == NULL) { | |
314 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
315 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
316 } | |
317 } | |
318 | |
319 void | |
320 YoungList::reset_auxilary_lists() { | |
321 guarantee( is_empty(), "young list should be empty" ); | |
322 assert(check_list_well_formed(), "young list should be well formed"); | |
323 | |
324 // Add survivor regions to SurvRateGroup. | |
325 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 326 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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327 |
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328 int young_index_in_cset = 0; |
342 | 329 for (HeapRegion* curr = _survivor_head; |
330 curr != NULL; | |
331 curr = curr->get_next_young_region()) { | |
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332 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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333 |
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334 // The region is a non-empty survivor so let's add it to |
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335 // the incremental collection set for the next evacuation |
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336 // pause. |
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337 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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338 young_index_in_cset += 1; |
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339 } |
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340 assert((size_t) young_index_in_cset == _survivor_length, |
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341 "post-condition"); |
342 | 342 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
343 | |
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344 _head = _survivor_head; |
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345 _length = _survivor_length; |
342 | 346 if (_survivor_head != NULL) { |
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347 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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348 assert(_survivor_length > 0, "invariant"); |
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349 _survivor_tail->set_next_young_region(NULL); |
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350 } |
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351 |
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352 // Don't clear the survivor list handles until the start of |
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353 // the next evacuation pause - we need it in order to re-tag |
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354 // the survivor regions from this evacuation pause as 'young' |
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355 // at the start of the next. |
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356 |
545 | 357 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 358 |
359 assert(check_list_well_formed(), "young list should be well formed"); | |
360 } | |
361 | |
362 void YoungList::print() { | |
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363 HeapRegion* lists[] = {_head, _survivor_head}; |
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364 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 365 |
366 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
367 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
368 HeapRegion *curr = lists[list]; | |
369 if (curr == NULL) | |
370 gclog_or_tty->print_cr(" empty"); | |
371 while (curr != NULL) { | |
372 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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373 "age: %4d, y: %d, surv: %d", |
342 | 374 curr->bottom(), curr->end(), |
375 curr->top(), | |
376 curr->prev_top_at_mark_start(), | |
377 curr->next_top_at_mark_start(), | |
378 curr->top_at_conc_mark_count(), | |
379 curr->age_in_surv_rate_group_cond(), | |
380 curr->is_young(), | |
381 curr->is_survivor()); | |
382 curr = curr->get_next_young_region(); | |
383 } | |
384 } | |
385 | |
386 gclog_or_tty->print_cr(""); | |
387 } | |
388 | |
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389 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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390 { |
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391 // Claim the right to put the region on the dirty cards region list |
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392 // by installing a self pointer. |
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393 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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394 if (next == NULL) { |
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395 HeapRegion* res = (HeapRegion*) |
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396 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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397 NULL); |
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398 if (res == NULL) { |
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399 HeapRegion* head; |
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400 do { |
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401 // Put the region to the dirty cards region list. |
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402 head = _dirty_cards_region_list; |
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403 next = (HeapRegion*) |
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404 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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405 if (next == head) { |
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406 assert(hr->get_next_dirty_cards_region() == hr, |
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407 "hr->get_next_dirty_cards_region() != hr"); |
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408 if (next == NULL) { |
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409 // The last region in the list points to itself. |
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410 hr->set_next_dirty_cards_region(hr); |
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411 } else { |
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412 hr->set_next_dirty_cards_region(next); |
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413 } |
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414 } |
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415 } while (next != head); |
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416 } |
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417 } |
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418 } |
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419 |
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420 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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421 { |
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422 HeapRegion* head; |
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423 HeapRegion* hr; |
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424 do { |
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425 head = _dirty_cards_region_list; |
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426 if (head == NULL) { |
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427 return NULL; |
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428 } |
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429 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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430 if (head == new_head) { |
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431 // The last region. |
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432 new_head = NULL; |
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433 } |
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434 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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435 head); |
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436 } while (hr != head); |
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437 assert(hr != NULL, "invariant"); |
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438 hr->set_next_dirty_cards_region(NULL); |
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439 return hr; |
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440 } |
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441 |
342 | 442 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 443 _cg1r->stop(); |
342 | 444 _cmThread->stop(); |
445 } | |
446 | |
3377
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447 #ifdef ASSERT |
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448 // A region is added to the collection set as it is retired |
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449 // so an address p can point to a region which will be in the |
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450 // collection set but has not yet been retired. This method |
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451 // therefore is only accurate during a GC pause after all |
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452 // regions have been retired. It is used for debugging |
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453 // to check if an nmethod has references to objects that can |
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454 // be move during a partial collection. Though it can be |
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455 // inaccurate, it is sufficient for G1 because the conservative |
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456 // implementation of is_scavengable() for G1 will indicate that |
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457 // all nmethods must be scanned during a partial collection. |
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458 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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459 HeapRegion* hr = heap_region_containing(p); |
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460 return hr != NULL && hr->in_collection_set(); |
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461 } |
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462 #endif |
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463 |
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464 // Returns true if the reference points to an object that |
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465 // can move in an incremental collecction. |
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466 bool G1CollectedHeap::is_scavengable(const void* p) { |
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467 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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468 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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469 HeapRegion* hr = heap_region_containing(p); |
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470 if (hr == NULL) { |
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471 // perm gen (or null) |
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472 return false; |
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473 } else { |
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474 return !hr->isHumongous(); |
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475 } |
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476 } |
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477 |
342 | 478 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
479 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
480 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
481 | |
482 // Count the dirty cards at the start. | |
483 CountNonCleanMemRegionClosure count1(this); | |
484 ct_bs->mod_card_iterate(&count1); | |
485 int orig_count = count1.n(); | |
486 | |
487 // First clear the logged cards. | |
488 ClearLoggedCardTableEntryClosure clear; | |
489 dcqs.set_closure(&clear); | |
490 dcqs.apply_closure_to_all_completed_buffers(); | |
491 dcqs.iterate_closure_all_threads(false); | |
492 clear.print_histo(); | |
493 | |
494 // Now ensure that there's no dirty cards. | |
495 CountNonCleanMemRegionClosure count2(this); | |
496 ct_bs->mod_card_iterate(&count2); | |
497 if (count2.n() != 0) { | |
498 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
499 count2.n(), orig_count); | |
500 } | |
501 guarantee(count2.n() == 0, "Card table should be clean."); | |
502 | |
503 RedirtyLoggedCardTableEntryClosure redirty; | |
504 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
505 dcqs.apply_closure_to_all_completed_buffers(); | |
506 dcqs.iterate_closure_all_threads(false); | |
507 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
508 clear.calls(), orig_count); | |
509 guarantee(redirty.calls() == clear.calls(), | |
510 "Or else mechanism is broken."); | |
511 | |
512 CountNonCleanMemRegionClosure count3(this); | |
513 ct_bs->mod_card_iterate(&count3); | |
514 if (count3.n() != orig_count) { | |
515 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
516 orig_count, count3.n()); | |
517 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
518 } | |
519 | |
520 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
521 } | |
522 | |
523 // Private class members. | |
524 | |
525 G1CollectedHeap* G1CollectedHeap::_g1h; | |
526 | |
527 // Private methods. | |
528 | |
2152 | 529 HeapRegion* |
2361 | 530 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 531 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
532 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
533 if (!_secondary_free_list.is_empty()) { | |
534 if (G1ConcRegionFreeingVerbose) { | |
535 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
536 "secondary_free_list has "SIZE_FORMAT" entries", | |
537 _secondary_free_list.length()); | |
538 } | |
539 // It looks as if there are free regions available on the | |
540 // secondary_free_list. Let's move them to the free_list and try | |
541 // again to allocate from it. | |
542 append_secondary_free_list(); | |
543 | |
544 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
545 "empty we should have moved at least one entry to the free_list"); | |
546 HeapRegion* res = _free_list.remove_head(); | |
547 if (G1ConcRegionFreeingVerbose) { | |
548 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
549 "allocated "HR_FORMAT" from secondary_free_list", | |
550 HR_FORMAT_PARAMS(res)); | |
551 } | |
552 return res; | |
553 } | |
554 | |
555 // Wait here until we get notifed either when (a) there are no | |
556 // more free regions coming or (b) some regions have been moved on | |
557 // the secondary_free_list. | |
558 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
559 } | |
560 | |
561 if (G1ConcRegionFreeingVerbose) { | |
562 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
563 "could not allocate from secondary_free_list"); | |
564 } | |
565 return NULL; | |
566 } | |
567 | |
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568 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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569 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 570 "the only time we use this to allocate a humongous region is " |
571 "when we are allocating a single humongous region"); | |
572 | |
573 HeapRegion* res; | |
574 if (G1StressConcRegionFreeing) { | |
575 if (!_secondary_free_list.is_empty()) { | |
576 if (G1ConcRegionFreeingVerbose) { | |
577 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
578 "forced to look at the secondary_free_list"); | |
579 } | |
2361 | 580 res = new_region_try_secondary_free_list(); |
2152 | 581 if (res != NULL) { |
582 return res; | |
583 } | |
584 } | |
585 } | |
586 res = _free_list.remove_head_or_null(); | |
587 if (res == NULL) { | |
588 if (G1ConcRegionFreeingVerbose) { | |
589 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
590 "res == NULL, trying the secondary_free_list"); | |
591 } | |
2361 | 592 res = new_region_try_secondary_free_list(); |
2152 | 593 } |
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594 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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595 // Currently, only attempts to allocate GC alloc regions set |
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596 // do_expand to true. So, we should only reach here during a |
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597 // safepoint. If this assumption changes we might have to |
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598 // reconsider the use of _expand_heap_after_alloc_failure. |
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599 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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600 |
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601 ergo_verbose1(ErgoHeapSizing, |
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602 "attempt heap expansion", |
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603 ergo_format_reason("region allocation request failed") |
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604 ergo_format_byte("allocation request"), |
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605 word_size * HeapWordSize); |
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606 if (expand(word_size * HeapWordSize)) { |
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607 // Given that expand() succeeded in expanding the heap, and we |
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608 // always expand the heap by an amount aligned to the heap |
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609 // region size, the free list should in theory not be empty. So |
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610 // it would probably be OK to use remove_head(). But the extra |
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611 // check for NULL is unlikely to be a performance issue here (we |
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612 // just expanded the heap!) so let's just be conservative and |
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613 // use remove_head_or_null(). |
3766 | 614 res = _free_list.remove_head_or_null(); |
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615 } else { |
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616 _expand_heap_after_alloc_failure = false; |
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617 } |
342 | 618 } |
619 return res; | |
620 } | |
621 | |
3766 | 622 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
623 size_t word_size) { | |
2361 | 624 assert(isHumongous(word_size), "word_size should be humongous"); |
625 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
626 | |
3766 | 627 size_t first = G1_NULL_HRS_INDEX; |
2152 | 628 if (num_regions == 1) { |
629 // Only one region to allocate, no need to go through the slower | |
630 // path. The caller will attempt the expasion if this fails, so | |
631 // let's not try to expand here too. | |
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632 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 633 if (hr != NULL) { |
634 first = hr->hrs_index(); | |
635 } else { | |
3766 | 636 first = G1_NULL_HRS_INDEX; |
2152 | 637 } |
638 } else { | |
639 // We can't allocate humongous regions while cleanupComplete() is | |
640 // running, since some of the regions we find to be empty might not | |
641 // yet be added to the free list and it is not straightforward to | |
642 // know which list they are on so that we can remove them. Note | |
643 // that we only need to do this if we need to allocate more than | |
644 // one region to satisfy the current humongous allocation | |
645 // request. If we are only allocating one region we use the common | |
646 // region allocation code (see above). | |
647 wait_while_free_regions_coming(); | |
2361 | 648 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 649 |
650 if (free_regions() >= num_regions) { | |
3766 | 651 first = _hrs.find_contiguous(num_regions); |
652 if (first != G1_NULL_HRS_INDEX) { | |
653 for (size_t i = first; i < first + num_regions; ++i) { | |
654 HeapRegion* hr = region_at(i); | |
2152 | 655 assert(hr->is_empty(), "sanity"); |
2361 | 656 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 657 hr->set_pending_removal(true); |
658 } | |
659 _free_list.remove_all_pending(num_regions); | |
660 } | |
661 } | |
662 } | |
663 return first; | |
664 } | |
665 | |
2361 | 666 HeapWord* |
3766 | 667 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 668 size_t num_regions, |
669 size_t word_size) { | |
3766 | 670 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 671 assert(isHumongous(word_size), "word_size should be humongous"); |
672 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
673 | |
674 // Index of last region in the series + 1. | |
3766 | 675 size_t last = first + num_regions; |
2361 | 676 |
677 // We need to initialize the region(s) we just discovered. This is | |
678 // a bit tricky given that it can happen concurrently with | |
679 // refinement threads refining cards on these regions and | |
680 // potentially wanting to refine the BOT as they are scanning | |
681 // those cards (this can happen shortly after a cleanup; see CR | |
682 // 6991377). So we have to set up the region(s) carefully and in | |
683 // a specific order. | |
684 | |
685 // The word size sum of all the regions we will allocate. | |
686 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
687 assert(word_size <= word_size_sum, "sanity"); | |
688 | |
689 // This will be the "starts humongous" region. | |
3766 | 690 HeapRegion* first_hr = region_at(first); |
2361 | 691 // The header of the new object will be placed at the bottom of |
692 // the first region. | |
693 HeapWord* new_obj = first_hr->bottom(); | |
694 // This will be the new end of the first region in the series that | |
695 // should also match the end of the last region in the seriers. | |
696 HeapWord* new_end = new_obj + word_size_sum; | |
697 // This will be the new top of the first region that will reflect | |
698 // this allocation. | |
699 HeapWord* new_top = new_obj + word_size; | |
700 | |
701 // First, we need to zero the header of the space that we will be | |
702 // allocating. When we update top further down, some refinement | |
703 // threads might try to scan the region. By zeroing the header we | |
704 // ensure that any thread that will try to scan the region will | |
705 // come across the zero klass word and bail out. | |
706 // | |
707 // NOTE: It would not have been correct to have used | |
708 // CollectedHeap::fill_with_object() and make the space look like | |
709 // an int array. The thread that is doing the allocation will | |
710 // later update the object header to a potentially different array | |
711 // type and, for a very short period of time, the klass and length | |
712 // fields will be inconsistent. This could cause a refinement | |
713 // thread to calculate the object size incorrectly. | |
714 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
715 | |
716 // We will set up the first region as "starts humongous". This | |
717 // will also update the BOT covering all the regions to reflect | |
718 // that there is a single object that starts at the bottom of the | |
719 // first region. | |
720 first_hr->set_startsHumongous(new_top, new_end); | |
721 | |
722 // Then, if there are any, we will set up the "continues | |
723 // humongous" regions. | |
724 HeapRegion* hr = NULL; | |
3766 | 725 for (size_t i = first + 1; i < last; ++i) { |
726 hr = region_at(i); | |
2361 | 727 hr->set_continuesHumongous(first_hr); |
728 } | |
729 // If we have "continues humongous" regions (hr != NULL), then the | |
730 // end of the last one should match new_end. | |
731 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
732 | |
733 // Up to this point no concurrent thread would have been able to | |
734 // do any scanning on any region in this series. All the top | |
735 // fields still point to bottom, so the intersection between | |
736 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
737 // update the top fields, we'll do a storestore to make sure that | |
738 // no thread sees the update to top before the zeroing of the | |
739 // object header and the BOT initialization. | |
740 OrderAccess::storestore(); | |
741 | |
742 // Now that the BOT and the object header have been initialized, | |
743 // we can update top of the "starts humongous" region. | |
744 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
745 "new_top should be in this region"); | |
746 first_hr->set_top(new_top); | |
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747 if (_hr_printer.is_active()) { |
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748 HeapWord* bottom = first_hr->bottom(); |
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749 HeapWord* end = first_hr->orig_end(); |
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750 if ((first + 1) == last) { |
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751 // the series has a single humongous region |
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752 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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753 } else { |
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754 // the series has more than one humongous regions |
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755 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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756 } |
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757 } |
2361 | 758 |
759 // Now, we will update the top fields of the "continues humongous" | |
760 // regions. The reason we need to do this is that, otherwise, | |
761 // these regions would look empty and this will confuse parts of | |
762 // G1. For example, the code that looks for a consecutive number | |
763 // of empty regions will consider them empty and try to | |
764 // re-allocate them. We can extend is_empty() to also include | |
765 // !continuesHumongous(), but it is easier to just update the top | |
766 // fields here. The way we set top for all regions (i.e., top == | |
767 // end for all regions but the last one, top == new_top for the | |
768 // last one) is actually used when we will free up the humongous | |
769 // region in free_humongous_region(). | |
770 hr = NULL; | |
3766 | 771 for (size_t i = first + 1; i < last; ++i) { |
772 hr = region_at(i); | |
2361 | 773 if ((i + 1) == last) { |
774 // last continues humongous region | |
775 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
776 "new_top should fall on this region"); | |
777 hr->set_top(new_top); | |
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778 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 779 } else { |
780 // not last one | |
781 assert(new_top > hr->end(), "new_top should be above this region"); | |
782 hr->set_top(hr->end()); | |
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783 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 784 } |
785 } | |
786 // If we have continues humongous regions (hr != NULL), then the | |
787 // end of the last one should match new_end and its top should | |
788 // match new_top. | |
789 assert(hr == NULL || | |
790 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
791 | |
792 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
793 _summary_bytes_used += first_hr->used(); | |
794 _humongous_set.add(first_hr); | |
795 | |
796 return new_obj; | |
797 } | |
798 | |
342 | 799 // If could fit into free regions w/o expansion, try. |
800 // Otherwise, if can expand, do so. | |
801 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 802 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 803 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
804 | |
805 verify_region_sets_optional(); | |
342 | 806 |
807 size_t num_regions = | |
1973 | 808 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 809 size_t x_size = expansion_regions(); |
3766 | 810 size_t fs = _hrs.free_suffix(); |
811 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
812 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 813 // The only thing we can do now is attempt expansion. |
342 | 814 if (fs + x_size >= num_regions) { |
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815 // If the number of regions we're trying to allocate for this |
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816 // object is at most the number of regions in the free suffix, |
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817 // then the call to humongous_obj_allocate_find_first() above |
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818 // should have succeeded and we wouldn't be here. |
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819 // |
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820 // We should only be trying to expand when the free suffix is |
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821 // not sufficient for the object _and_ we have some expansion |
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822 // room available. |
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823 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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824 |
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825 ergo_verbose1(ErgoHeapSizing, |
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826 "attempt heap expansion", |
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827 ergo_format_reason("humongous allocation request failed") |
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828 ergo_format_byte("allocation request"), |
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829 word_size * HeapWordSize); |
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830 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 831 // Even though the heap was expanded, it might not have |
832 // reached the desired size. So, we cannot assume that the | |
833 // allocation will succeed. | |
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834 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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835 } |
2152 | 836 } |
837 } | |
838 | |
2361 | 839 HeapWord* result = NULL; |
3766 | 840 if (first != G1_NULL_HRS_INDEX) { |
2361 | 841 result = |
842 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
843 assert(result != NULL, "it should always return a valid result"); | |
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844 |
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845 // A successful humongous object allocation changes the used space |
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846 // information of the old generation so we need to recalculate the |
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847 // sizes and update the jstat counters here. |
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848 g1mm()->update_sizes(); |
2152 | 849 } |
850 | |
851 verify_region_sets_optional(); | |
2361 | 852 |
853 return result; | |
342 | 854 } |
855 | |
1973 | 856 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
857 assert_heap_not_locked_and_not_at_safepoint(); | |
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858 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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859 |
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860 unsigned int dummy_gc_count_before; |
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861 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 862 } |
863 | |
864 HeapWord* | |
865 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 866 bool* gc_overhead_limit_was_exceeded) { |
867 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 868 |
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869 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 870 for (int try_count = 1; /* we'll return */; try_count += 1) { |
871 unsigned int gc_count_before; | |
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872 |
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873 HeapWord* result = NULL; |
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874 if (!isHumongous(word_size)) { |
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875 result = attempt_allocation(word_size, &gc_count_before); |
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876 } else { |
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877 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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878 } |
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879 if (result != NULL) { |
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880 return result; |
342 | 881 } |
882 | |
883 // Create the garbage collection operation... | |
1973 | 884 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 885 // ...and get the VM thread to execute it. |
886 VMThread::execute(&op); | |
1973 | 887 |
888 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
889 // If the operation was successful we'll return the result even | |
890 // if it is NULL. If the allocation attempt failed immediately | |
891 // after a Full GC, it's unlikely we'll be able to allocate now. | |
892 HeapWord* result = op.result(); | |
893 if (result != NULL && !isHumongous(word_size)) { | |
894 // Allocations that take place on VM operations do not do any | |
895 // card dirtying and we have to do it here. We only have to do | |
896 // this for non-humongous allocations, though. | |
897 dirty_young_block(result, word_size); | |
898 } | |
342 | 899 return result; |
1973 | 900 } else { |
901 assert(op.result() == NULL, | |
902 "the result should be NULL if the VM op did not succeed"); | |
342 | 903 } |
904 | |
905 // Give a warning if we seem to be looping forever. | |
906 if ((QueuedAllocationWarningCount > 0) && | |
907 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 908 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 909 } |
910 } | |
1973 | 911 |
912 ShouldNotReachHere(); | |
2433
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913 return NULL; |
342 | 914 } |
915 | |
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916 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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917 unsigned int *gc_count_before_ret) { |
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918 // Make sure you read the note in attempt_allocation_humongous(). |
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919 |
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920 assert_heap_not_locked_and_not_at_safepoint(); |
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921 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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922 "be called for humongous allocation requests"); |
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923 |
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924 // We should only get here after the first-level allocation attempt |
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925 // (attempt_allocation()) failed to allocate. |
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|
926 |
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927 // We will loop until a) we manage to successfully perform the |
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928 // allocation or b) we successfully schedule a collection which |
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929 // fails to perform the allocation. b) is the only case when we'll |
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|
930 // return NULL. |
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|
931 HeapWord* result = NULL; |
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932 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
933 bool should_try_gc; |
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|
934 unsigned int gc_count_before; |
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|
935 |
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|
936 { |
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937 MutexLockerEx x(Heap_lock); |
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938 |
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939 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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940 false /* bot_updates */); |
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|
941 if (result != NULL) { |
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|
942 return result; |
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|
943 } |
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|
944 |
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|
945 // If we reach here, attempt_allocation_locked() above failed to |
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|
946 // allocate a new region. So the mutator alloc region should be NULL. |
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947 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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|
948 |
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|
949 if (GC_locker::is_active_and_needs_gc()) { |
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|
950 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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diff
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|
951 // No need for an ergo verbose message here, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
952 // can_expand_young_list() does this when it returns true. |
2433
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953 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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|
954 false /* bot_updates */); |
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|
955 if (result != NULL) { |
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|
956 return result; |
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|
957 } |
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|
958 } |
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|
959 should_try_gc = false; |
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|
960 } else { |
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|
961 // Read the GC count while still holding the Heap_lock. |
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962 gc_count_before = SharedHeap::heap()->total_collections(); |
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|
963 should_try_gc = true; |
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|
964 } |
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|
965 } |
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|
966 |
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|
967 if (should_try_gc) { |
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|
968 bool succeeded; |
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|
969 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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970 if (result != NULL) { |
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|
971 assert(succeeded, "only way to get back a non-NULL result"); |
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|
972 return result; |
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|
973 } |
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|
974 |
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|
975 if (succeeded) { |
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|
976 // If we get here we successfully scheduled a collection which |
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|
977 // failed to allocate. No point in trying to allocate |
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|
978 // further. We'll just return NULL. |
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|
979 MutexLockerEx x(Heap_lock); |
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980 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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|
981 return NULL; |
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|
982 } |
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|
983 } else { |
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|
984 GC_locker::stall_until_clear(); |
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|
985 } |
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|
986 |
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|
987 // We can reach here if we were unsuccessul in scheduling a |
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|
988 // collection (because another thread beat us to it) or if we were |
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|
989 // stalled due to the GC locker. In either can we should retry the |
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|
990 // allocation attempt in case another thread successfully |
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|
991 // performed a collection and reclaimed enough space. We do the |
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|
992 // first attempt (without holding the Heap_lock) here and the |
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|
993 // follow-on attempt will be at the start of the next loop |
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|
994 // iteration (after taking the Heap_lock). |
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|
995 result = _mutator_alloc_region.attempt_allocation(word_size, |
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|
996 false /* bot_updates */); |
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|
997 if (result != NULL ){ |
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|
998 return result; |
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|
999 } |
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|
1000 |
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|
1001 // Give a warning if we seem to be looping forever. |
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1002 if ((QueuedAllocationWarningCount > 0) && |
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1003 (try_count % QueuedAllocationWarningCount == 0)) { |
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|
1004 warning("G1CollectedHeap::attempt_allocation_slow() " |
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|
1005 "retries %d times", try_count); |
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|
1006 } |
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|
1007 } |
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|
1008 |
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|
1009 ShouldNotReachHere(); |
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|
1010 return NULL; |
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|
1011 } |
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|
1012 |
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|
1013 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1014 unsigned int * gc_count_before_ret) { |
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1015 // The structure of this method has a lot of similarities to |
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1016 // attempt_allocation_slow(). The reason these two were not merged |
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1017 // into a single one is that such a method would require several "if |
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1018 // allocation is not humongous do this, otherwise do that" |
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1019 // conditional paths which would obscure its flow. In fact, an early |
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1020 // version of this code did use a unified method which was harder to |
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1021 // follow and, as a result, it had subtle bugs that were hard to |
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1022 // track down. So keeping these two methods separate allows each to |
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1023 // be more readable. It will be good to keep these two in sync as |
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1024 // much as possible. |
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1025 |
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1026 assert_heap_not_locked_and_not_at_safepoint(); |
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1027 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1028 "should only be called for humongous allocations"); |
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1029 |
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1030 // We will loop until a) we manage to successfully perform the |
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1031 // allocation or b) we successfully schedule a collection which |
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1032 // fails to perform the allocation. b) is the only case when we'll |
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1033 // return NULL. |
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1034 HeapWord* result = NULL; |
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1035 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1036 bool should_try_gc; |
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1037 unsigned int gc_count_before; |
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1038 |
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1039 { |
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1040 MutexLockerEx x(Heap_lock); |
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1041 |
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1042 // Given that humongous objects are not allocated in young |
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1043 // regions, we'll first try to do the allocation without doing a |
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1044 // collection hoping that there's enough space in the heap. |
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1045 result = humongous_obj_allocate(word_size); |
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1046 if (result != NULL) { |
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1047 return result; |
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1048 } |
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1049 |
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1050 if (GC_locker::is_active_and_needs_gc()) { |
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1051 should_try_gc = false; |
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1052 } else { |
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1053 // Read the GC count while still holding the Heap_lock. |
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1054 gc_count_before = SharedHeap::heap()->total_collections(); |
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1055 should_try_gc = true; |
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1056 } |
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1057 } |
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1058 |
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1059 if (should_try_gc) { |
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1060 // If we failed to allocate the humongous object, we should try to |
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1061 // do a collection pause (if we're allowed) in case it reclaims |
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1062 // enough space for the allocation to succeed after the pause. |
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1063 |
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1064 bool succeeded; |
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1065 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1066 if (result != NULL) { |
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1067 assert(succeeded, "only way to get back a non-NULL result"); |
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1068 return result; |
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1069 } |
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1070 |
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1071 if (succeeded) { |
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1072 // If we get here we successfully scheduled a collection which |
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1073 // failed to allocate. No point in trying to allocate |
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1074 // further. We'll just return NULL. |
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1075 MutexLockerEx x(Heap_lock); |
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1076 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1077 return NULL; |
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1078 } |
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1079 } else { |
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1080 GC_locker::stall_until_clear(); |
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1081 } |
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1082 |
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1083 // We can reach here if we were unsuccessul in scheduling a |
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1084 // collection (because another thread beat us to it) or if we were |
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1085 // stalled due to the GC locker. In either can we should retry the |
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1086 // allocation attempt in case another thread successfully |
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1087 // performed a collection and reclaimed enough space. Give a |
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1088 // warning if we seem to be looping forever. |
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1089 |
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1090 if ((QueuedAllocationWarningCount > 0) && |
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1091 (try_count % QueuedAllocationWarningCount == 0)) { |
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1092 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1093 "retries %d times", try_count); |
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1094 } |
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1095 } |
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1096 |
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1097 ShouldNotReachHere(); |
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1098 return NULL; |
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1099 } |
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1100 |
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1101 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1102 bool expect_null_mutator_alloc_region) { |
2152 | 1103 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1104 assert(_mutator_alloc_region.get() == NULL || |
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1105 !expect_null_mutator_alloc_region, |
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1106 "the current alloc region was unexpectedly found to be non-NULL"); |
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1107 |
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1108 if (!isHumongous(word_size)) { |
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1109 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1110 false /* bot_updates */); |
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1111 } else { |
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1112 return humongous_obj_allocate(word_size); |
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1113 } |
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1114 |
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1115 ShouldNotReachHere(); |
342 | 1116 } |
1117 | |
1118 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1119 ModRefBarrierSet* _mr_bs; | |
1120 public: | |
1121 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1122 bool doHeapRegion(HeapRegion* r) { | |
1123 r->reset_gc_time_stamp(); | |
1124 if (r->continuesHumongous()) | |
1125 return false; | |
1126 HeapRegionRemSet* hrrs = r->rem_set(); | |
1127 if (hrrs != NULL) hrrs->clear(); | |
1128 // You might think here that we could clear just the cards | |
1129 // corresponding to the used region. But no: if we leave a dirty card | |
1130 // in a region we might allocate into, then it would prevent that card | |
1131 // from being enqueued, and cause it to be missed. | |
1132 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1133 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1134 return false; | |
1135 } | |
1136 }; | |
1137 | |
1138 | |
1139 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1140 ModRefBarrierSet* _mr_bs; | |
1141 public: | |
1142 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1143 bool doHeapRegion(HeapRegion* r) { | |
1144 if (r->continuesHumongous()) return false; | |
1145 if (r->used_region().word_size() != 0) { | |
1146 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1147 } | |
1148 return false; | |
1149 } | |
1150 }; | |
1151 | |
626
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1152 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1153 G1CollectedHeap* _g1h; |
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1154 UpdateRSOopClosure _cl; |
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1155 int _worker_i; |
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1156 public: |
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1157 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1158 _cl(g1->g1_rem_set(), worker_i), |
626
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1159 _worker_i(worker_i), |
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1160 _g1h(g1) |
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1161 { } |
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1162 |
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1163 bool doHeapRegion(HeapRegion* r) { |
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1164 if (!r->continuesHumongous()) { |
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1165 _cl.set_from(r); |
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1166 r->oop_iterate(&_cl); |
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1167 } |
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1168 return false; |
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1169 } |
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1170 }; |
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1171 |
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1172 class ParRebuildRSTask: public AbstractGangTask { |
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1173 G1CollectedHeap* _g1; |
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1174 public: |
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1175 ParRebuildRSTask(G1CollectedHeap* g1) |
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1176 : AbstractGangTask("ParRebuildRSTask"), |
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1177 _g1(g1) |
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1178 { } |
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1179 |
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1180 void work(uint worker_id) { |
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1181 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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1182 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
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1183 _g1->workers()->active_workers(), |
626
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1184 HeapRegion::RebuildRSClaimValue); |
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1185 } |
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1186 }; |
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1187 |
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1188 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1189 private: |
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1190 G1HRPrinter* _hr_printer; |
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1191 public: |
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1192 bool doHeapRegion(HeapRegion* hr) { |
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1193 assert(!hr->is_young(), "not expecting to find young regions"); |
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1194 // We only generate output for non-empty regions. |
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1195 if (!hr->is_empty()) { |
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1196 if (!hr->isHumongous()) { |
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1197 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1198 } else if (hr->startsHumongous()) { |
3986
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1199 if (hr->capacity() == HeapRegion::GrainBytes) { |
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1200 // single humongous region |
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1201 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1202 } else { |
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1203 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1204 } |
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1205 } else { |
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1206 assert(hr->continuesHumongous(), "only way to get here"); |
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1207 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1208 } |
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1209 } |
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1210 return false; |
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1211 } |
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1212 |
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1213 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1214 : _hr_printer(hr_printer) { } |
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1215 }; |
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1216 |
1973 | 1217 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1218 bool clear_all_soft_refs, |
342 | 1219 size_t word_size) { |
2152 | 1220 assert_at_safepoint(true /* should_be_vm_thread */); |
1221 | |
1359
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1222 if (GC_locker::check_active_before_gc()) { |
1973 | 1223 return false; |
1359
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1224 } |
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1225 |
2125
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1226 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1227 ResourceMark rm; |
1228 | |
838
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1229 if (PrintHeapAtGC) { |
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1230 Universe::print_heap_before_gc(); |
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1231 } |
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1232 |
4072 | 1233 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1234 verify_region_sets_optional(); |
342 | 1235 |
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1236 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1237 collector_policy()->should_clear_all_soft_refs(); |
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1238 |
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1239 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1240 |
342 | 1241 { |
1242 IsGCActiveMark x; | |
1243 | |
1244 // Timing | |
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1245 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1246 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1247 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1248 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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1249 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1250 PrintGC, true, gclog_or_tty); |
342 | 1251 |
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1252 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
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1253 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1254 |
342 | 1255 double start = os::elapsedTime(); |
1256 g1_policy()->record_full_collection_start(); | |
1257 | |
2152 | 1258 wait_while_free_regions_coming(); |
2361 | 1259 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1260 |
342 | 1261 gc_prologue(true); |
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1262 increment_total_collections(true /* full gc */); |
342 | 1263 |
1264 size_t g1h_prev_used = used(); | |
1265 assert(used() == recalculate_used(), "Should be equal"); | |
1266 | |
1267 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1268 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1269 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1270 prepare_for_verify(); |
3772
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1271 Universe::verify(/* allow dirty */ true, |
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1272 /* silent */ false, |
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1273 /* option */ VerifyOption_G1UsePrevMarking); |
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1274 |
342 | 1275 } |
3869
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|
1276 pre_full_gc_dump(); |
342 | 1277 |
1278 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1279 | |
3979
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1280 // Disable discovery and empty the discovered lists |
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1281 // for the CM ref processor. |
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1282 ref_processor_cm()->disable_discovery(); |
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1283 ref_processor_cm()->abandon_partial_discovery(); |
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1284 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1285 |
1286 // Abandon current iterations of concurrent marking and concurrent | |
1287 // refinement, if any are in progress. | |
1288 concurrent_mark()->abort(); | |
1289 | |
1290 // Make sure we'll choose a new allocation region afterwards. | |
2433
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1291 release_mutator_alloc_region(); |
636 | 1292 abandon_gc_alloc_regions(); |
1861 | 1293 g1_rem_set()->cleanupHRRS(); |
1394
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1294 |
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1295 // We should call this after we retire any currently active alloc |
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1296 // regions so that all the ALLOC / RETIRE events are generated |
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1297 // before the start GC event. |
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1298 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1299 |
1394
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1300 // We may have added regions to the current incremental collection |
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1301 // set between the last GC or pause and now. We need to clear the |
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1302 // incremental collection set and then start rebuilding it afresh |
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1303 // after this full GC. |
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1304 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1305 g1_policy()->clear_incremental_cset(); |
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1306 g1_policy()->stop_incremental_cset_building(); |
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1307 |
4072 | 1308 tear_down_region_sets(false /* free_list_only */); |
4710 | 1309 g1_policy()->set_gcs_are_young(true); |
342 | 1310 |
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1311 // See the comments in g1CollectedHeap.hpp and |
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1312 // G1CollectedHeap::ref_processing_init() about |
1974
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1313 // how reference processing currently works in G1. |
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1314 |
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1315 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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1316 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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1317 |
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1318 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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1319 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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1320 |
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1321 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1322 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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1323 |
342 | 1324 // Do collection work |
1325 { | |
1326 HandleMark hm; // Discard invalid handles created during gc | |
3979
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1327 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1328 } |
3979
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1329 |
2152 | 1330 assert(free_regions() == 0, "we should not have added any free regions"); |
4072 | 1331 rebuild_region_sets(false /* free_list_only */); |
342 | 1332 |
3979
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1333 // Enqueue any discovered reference objects that have |
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1334 // not been removed from the discovered lists. |
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1335 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1336 |
1337 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1338 | |
1089
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1339 MemoryService::track_memory_usage(); |
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1340 |
342 | 1341 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1342 HandleMark hm; // Discard invalid handles created during verification | |
1343 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
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1344 prepare_for_verify(); |
3772
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1345 Universe::verify(/* allow dirty */ false, |
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1346 /* silent */ false, |
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1347 /* option */ VerifyOption_G1UsePrevMarking); |
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1348 |
342 | 1349 } |
3979
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1350 |
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1351 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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1352 ref_processor_stw()->verify_no_references_recorded(); |
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1353 |
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1354 // Note: since we've just done a full GC, concurrent |
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1355 // marking is no longer active. Therefore we need not |
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1356 // re-enable reference discovery for the CM ref processor. |
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1357 // That will be done at the start of the next marking cycle. |
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1358 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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1359 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1360 |
1361 reset_gc_time_stamp(); | |
1362 // Since everything potentially moved, we will clear all remembered | |
626
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1363 // sets, and clear all cards. Later we will rebuild remebered |
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1364 // sets. We will also reset the GC time stamps of the regions. |
342 | 1365 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1366 heap_region_iterate(&rs_clear); | |
1367 | |
1368 // Resize the heap if necessary. | |
1656
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1369 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1370 |
3778
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1371 if (_hr_printer.is_active()) { |
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1372 // We should do this after we potentially resize the heap so |
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1373 // that all the COMMIT / UNCOMMIT events are generated before |
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1374 // the end GC event. |
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1375 |
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1376 PostCompactionPrinterClosure cl(hr_printer()); |
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1377 heap_region_iterate(&cl); |
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1378 |
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1379 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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1380 } |
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1381 |
342 | 1382 if (_cg1r->use_cache()) { |
1383 _cg1r->clear_and_record_card_counts(); | |
1384 _cg1r->clear_hot_cache(); | |
1385 } | |
1386 | |
626
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1387 // Rebuild remembered sets of all regions. |
1833
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1388 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4728
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1389 uint n_workers = |
4095
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1390 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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1391 workers()->active_workers(), |
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1392 Threads::number_of_non_daemon_threads()); |
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1393 assert(UseDynamicNumberOfGCThreads || |
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1394 n_workers == workers()->total_workers(), |
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1395 "If not dynamic should be using all the workers"); |
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1396 workers()->set_active_workers(n_workers); |
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1397 // Set parallel threads in the heap (_n_par_threads) only |
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1398 // before a parallel phase and always reset it to 0 after |
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1399 // the phase so that the number of parallel threads does |
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1400 // no get carried forward to a serial phase where there |
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1401 // may be code that is "possibly_parallel". |
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1402 set_par_threads(n_workers); |
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1403 |
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1404 ParRebuildRSTask rebuild_rs_task(this); |
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1405 assert(check_heap_region_claim_values( |
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1406 HeapRegion::InitialClaimValue), "sanity check"); |
4095
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1407 assert(UseDynamicNumberOfGCThreads || |
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1408 workers()->active_workers() == workers()->total_workers(), |
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1409 "Unless dynamic should use total workers"); |
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1410 // Use the most recent number of active workers |
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1411 assert(workers()->active_workers() > 0, |
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1412 "Active workers not properly set"); |
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1413 set_par_threads(workers()->active_workers()); |
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1414 workers()->run_task(&rebuild_rs_task); |
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1415 set_par_threads(0); |
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1416 assert(check_heap_region_claim_values( |
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1417 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1418 reset_heap_region_claim_values(); |
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1419 } else { |
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1420 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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1421 heap_region_iterate(&rebuild_rs); |
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1422 } |
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1423 |
342 | 1424 if (PrintGC) { |
1425 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1426 } | |
1427 | |
1428 if (true) { // FIXME | |
1429 // Ask the permanent generation to adjust size for full collections | |
1430 perm()->compute_new_size(); | |
1431 } | |
1432 | |
1394
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1433 // Start a new incremental collection set for the next pause |
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1434 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1435 g1_policy()->start_incremental_cset_building(); |
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1436 |
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1437 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1438 // regions to the incremental collection set for the next |
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1439 // evacuation pause. |
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1440 clear_cset_fast_test(); |
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1441 |
2433
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1442 init_mutator_alloc_region(); |
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1443 |
342 | 1444 double end = os::elapsedTime(); |
1445 g1_policy()->record_full_collection_end(); | |
1446 | |
546
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1447 #ifdef TRACESPINNING |
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1448 ParallelTaskTerminator::print_termination_counts(); |
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1449 #endif |
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1450 |
342 | 1451 gc_epilogue(true); |
1452 | |
794 | 1453 // Discard all rset updates |
1454 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1455 assert(!G1DeferredRSUpdate |
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1456 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1457 } |
1458 | |
3867
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1459 _young_list->reset_sampled_info(); |
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1460 // At this point there should be no regions in the |
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1461 // entire heap tagged as young. |
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1462 assert( check_young_list_empty(true /* check_heap */), |
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1463 "young list should be empty at this point"); |
838
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1464 |
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1465 // Update the number of full collections that have been completed. |
2030
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1466 increment_full_collections_completed(false /* concurrent */); |
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1467 |
3766 | 1468 _hrs.verify_optional(); |
2152 | 1469 verify_region_sets_optional(); |
1470 | |
838
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1471 if (PrintHeapAtGC) { |
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1472 Universe::print_heap_after_gc(); |
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1473 } |
3980
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1474 g1mm()->update_sizes(); |
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1475 post_full_gc_dump(); |
1973 | 1476 |
1477 return true; | |
342 | 1478 } |
1479 | |
1480 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1481 // do_collection() will return whether it succeeded in performing |
1482 // the GC. Currently, there is no facility on the | |
1483 // do_full_collection() API to notify the caller than the collection | |
1484 // did not succeed (e.g., because it was locked out by the GC | |
1485 // locker). So, right now, we'll ignore the return value. | |
1486 bool dummy = do_collection(true, /* explicit_gc */ | |
1487 clear_all_soft_refs, | |
1488 0 /* word_size */); | |
342 | 1489 } |
1490 | |
1491 // This code is mostly copied from TenuredGeneration. | |
1492 void | |
1493 G1CollectedHeap:: | |
1494 resize_if_necessary_after_full_collection(size_t word_size) { | |
1495 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1496 | |
1497 // Include the current allocation, if any, and bytes that will be | |
1498 // pre-allocated to support collections, as "used". | |
1499 const size_t used_after_gc = used(); | |
1500 const size_t capacity_after_gc = capacity(); | |
1501 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1502 | |
1717
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1503 // This is enforced in arguments.cpp. |
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1504 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1505 "otherwise the code below doesn't make sense"); |
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1506 |
342 | 1507 // We don't have floating point command-line arguments |
1717
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1508 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1509 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1510 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1511 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1512 | |
1717
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1513 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1514 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1515 |
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1516 // We have to be careful here as these two calculations can overflow |
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1517 // 32-bit size_t's. |
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1518 double used_after_gc_d = (double) used_after_gc; |
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1519 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1520 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1521 |
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1522 // Let's make sure that they are both under the max heap size, which |
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1523 // by default will make them fit into a size_t. |
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1524 double desired_capacity_upper_bound = (double) max_heap_size; |
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1525 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1526 desired_capacity_upper_bound); |
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1527 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1528 desired_capacity_upper_bound); |
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1529 |
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1530 // We can now safely turn them into size_t's. |
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1531 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1532 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1533 |
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1534 // This assert only makes sense here, before we adjust them |
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1535 // with respect to the min and max heap size. |
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1536 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1537 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1538 "maximum_desired_capacity = "SIZE_FORMAT, |
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1539 minimum_desired_capacity, maximum_desired_capacity)); |
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1540 |
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1541 // Should not be greater than the heap max size. No need to adjust |
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1542 // it with respect to the heap min size as it's a lower bound (i.e., |
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1543 // we'll try to make the capacity larger than it, not smaller). |
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1544 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1545 // Should not be less than the heap min size. No need to adjust it |
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1546 // with respect to the heap max size as it's an upper bound (i.e., |
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1547 // we'll try to make the capacity smaller than it, not greater). |
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1548 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1549 |
1717
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1550 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1551 // Don't expand unless it's significant |
1552 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1553 ergo_verbose4(ErgoHeapSizing, |
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1554 "attempt heap expansion", |
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1555 ergo_format_reason("capacity lower than " |
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1556 "min desired capacity after Full GC") |
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1557 ergo_format_byte("capacity") |
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1558 ergo_format_byte("occupancy") |
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1559 ergo_format_byte_perc("min desired capacity"), |
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1560 capacity_after_gc, used_after_gc, |
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1561 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1562 expand(expand_bytes); |
342 | 1563 |
1564 // No expansion, now see if we want to shrink | |
1717
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1565 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1566 // Capacity too large, compute shrinking size |
1567 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
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1568 ergo_verbose4(ErgoHeapSizing, |
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1569 "attempt heap shrinking", |
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1570 ergo_format_reason("capacity higher than " |
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1571 "max desired capacity after Full GC") |
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1572 ergo_format_byte("capacity") |
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1573 ergo_format_byte("occupancy") |
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1574 ergo_format_byte_perc("max desired capacity"), |
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1575 capacity_after_gc, used_after_gc, |
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1576 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1577 shrink(shrink_bytes); |
1578 } | |
1579 } | |
1580 | |
1581 | |
1582 HeapWord* | |
1973 | 1583 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1584 bool* succeeded) { | |
2152 | 1585 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1586 |
1587 *succeeded = true; | |
1588 // Let's attempt the allocation first. | |
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1589 HeapWord* result = |
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1590 attempt_allocation_at_safepoint(word_size, |
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1591 false /* expect_null_mutator_alloc_region */); |
1973 | 1592 if (result != NULL) { |
1593 assert(*succeeded, "sanity"); | |
1594 return result; | |
1595 } | |
342 | 1596 |
1597 // In a G1 heap, we're supposed to keep allocation from failing by | |
1598 // incremental pauses. Therefore, at least for now, we'll favor | |
1599 // expansion over collection. (This might change in the future if we can | |
1600 // do something smarter than full collection to satisfy a failed alloc.) | |
1601 result = expand_and_allocate(word_size); | |
1602 if (result != NULL) { | |
1973 | 1603 assert(*succeeded, "sanity"); |
342 | 1604 return result; |
1605 } | |
1606 | |
1973 | 1607 // Expansion didn't work, we'll try to do a Full GC. |
1608 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1609 false, /* clear_all_soft_refs */ | |
1610 word_size); | |
1611 if (!gc_succeeded) { | |
1612 *succeeded = false; | |
1613 return NULL; | |
1614 } | |
1615 | |
1616 // Retry the allocation | |
1617 result = attempt_allocation_at_safepoint(word_size, | |
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1618 true /* expect_null_mutator_alloc_region */); |
342 | 1619 if (result != NULL) { |
1973 | 1620 assert(*succeeded, "sanity"); |
342 | 1621 return result; |
1622 } | |
1623 | |
1973 | 1624 // Then, try a Full GC that will collect all soft references. |
1625 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1626 true, /* clear_all_soft_refs */ | |
1627 word_size); | |
1628 if (!gc_succeeded) { | |
1629 *succeeded = false; | |
1630 return NULL; | |
1631 } | |
1632 | |
1633 // Retry the allocation once more | |
1634 result = attempt_allocation_at_safepoint(word_size, | |
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1635 true /* expect_null_mutator_alloc_region */); |
342 | 1636 if (result != NULL) { |
1973 | 1637 assert(*succeeded, "sanity"); |
342 | 1638 return result; |
1639 } | |
1640 | |
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1641 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1642 "Flag should have been handled and cleared prior to this point"); |
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1643 |
342 | 1644 // What else? We might try synchronous finalization later. If the total |
1645 // space available is large enough for the allocation, then a more | |
1646 // complete compaction phase than we've tried so far might be | |
1647 // appropriate. | |
1973 | 1648 assert(*succeeded, "sanity"); |
342 | 1649 return NULL; |
1650 } | |
1651 | |
1652 // Attempting to expand the heap sufficiently | |
1653 // to support an allocation of the given "word_size". If | |
1654 // successful, perform the allocation and return the address of the | |
1655 // allocated block, or else "NULL". | |
1656 | |
1657 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1658 assert_at_safepoint(true /* should_be_vm_thread */); |
1659 | |
1660 verify_region_sets_optional(); | |
1973 | 1661 |
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1662 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1663 ergo_verbose1(ErgoHeapSizing, |
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1664 "attempt heap expansion", |
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1665 ergo_format_reason("allocation request failed") |
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1666 ergo_format_byte("allocation request"), |
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1667 word_size * HeapWordSize); |
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1668 if (expand(expand_bytes)) { |
3766 | 1669 _hrs.verify_optional(); |
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1670 verify_region_sets_optional(); |
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1671 return attempt_allocation_at_safepoint(word_size, |
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1672 false /* expect_null_mutator_alloc_region */); |
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1673 } |
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1674 return NULL; |
342 | 1675 } |
1676 | |
3766 | 1677 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1678 HeapWord* new_end) { | |
1679 assert(old_end != new_end, "don't call this otherwise"); | |
1680 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1681 | |
1682 // Update the committed mem region. | |
1683 _g1_committed.set_end(new_end); | |
1684 // Tell the card table about the update. | |
1685 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1686 // Tell the BOT about the update. | |
1687 _bot_shared->resize(_g1_committed.word_size()); | |
1688 } | |
1689 | |
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1690 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1691 size_t old_mem_size = _g1_storage.committed_size(); |
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1692 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1693 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1694 HeapRegion::GrainBytes); | |
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1695 ergo_verbose2(ErgoHeapSizing, |
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1696 "expand the heap", |
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1697 ergo_format_byte("requested expansion amount") |
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1698 ergo_format_byte("attempted expansion amount"), |
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1699 expand_bytes, aligned_expand_bytes); |
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1700 |
3766 | 1701 // First commit the memory. |
1702 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1703 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1704 if (successful) { |
3766 | 1705 // Then propagate this update to the necessary data structures. |
1706 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1707 update_committed_space(old_end, new_end); | |
1708 | |
1709 FreeRegionList expansion_list("Local Expansion List"); | |
1710 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1711 assert(mr.start() == old_end, "post-condition"); | |
1712 // mr might be a smaller region than what was requested if | |
1713 // expand_by() was unable to allocate the HeapRegion instances | |
1714 assert(mr.end() <= new_end, "post-condition"); | |
1715 | |
1716 size_t actual_expand_bytes = mr.byte_size(); | |
1717 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1718 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1719 "post-condition"); | |
1720 if (actual_expand_bytes < aligned_expand_bytes) { | |
1721 // We could not expand _hrs to the desired size. In this case we | |
1722 // need to shrink the committed space accordingly. | |
1723 assert(mr.end() < new_end, "invariant"); | |
1724 | |
1725 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1726 // First uncommit the memory. | |
1727 _g1_storage.shrink_by(diff_bytes); | |
1728 // Then propagate this update to the necessary data structures. | |
1729 update_committed_space(new_end, mr.end()); | |
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1730 } |
3766 | 1731 _free_list.add_as_tail(&expansion_list); |
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1732 |
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1733 if (_hr_printer.is_active()) { |
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1734 HeapWord* curr = mr.start(); |
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1735 while (curr < mr.end()) { |
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1736 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1737 _hr_printer.commit(curr, curr_end); |
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1738 curr = curr_end; |
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1739 } |
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1740 assert(curr == mr.end(), "post-condition"); |
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1741 } |
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1742 g1_policy()->record_new_heap_size(n_regions()); |
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1743 } else { |
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1744 ergo_verbose0(ErgoHeapSizing, |
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1745 "did not expand the heap", |
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1746 ergo_format_reason("heap expansion operation failed")); |
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1747 // The expansion of the virtual storage space was unsuccessful. |
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1748 // Let's see if it was because we ran out of swap. |
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1749 if (G1ExitOnExpansionFailure && |
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1750 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1751 // We had head room... |
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1752 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1753 } |
1754 } | |
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1755 return successful; |
342 | 1756 } |
1757 | |
3766 | 1758 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1759 size_t old_mem_size = _g1_storage.committed_size(); |
1760 size_t aligned_shrink_bytes = | |
1761 ReservedSpace::page_align_size_down(shrink_bytes); | |
1762 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1763 HeapRegion::GrainBytes); | |
1764 size_t num_regions_deleted = 0; | |
3766 | 1765 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1766 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1767 assert(mr.end() == old_end, "post-condition"); | |
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1768 |
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1769 ergo_verbose3(ErgoHeapSizing, |
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1770 "shrink the heap", |
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1771 ergo_format_byte("requested shrinking amount") |
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1772 ergo_format_byte("aligned shrinking amount") |
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1773 ergo_format_byte("attempted shrinking amount"), |
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1774 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1775 if (mr.byte_size() > 0) { |
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1776 if (_hr_printer.is_active()) { |
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1777 HeapWord* curr = mr.end(); |
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1778 while (curr > mr.start()) { |
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1779 HeapWord* curr_end = curr; |
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1780 curr -= HeapRegion::GrainWords; |
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1781 _hr_printer.uncommit(curr, curr_end); |
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1782 } |
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1783 assert(curr == mr.start(), "post-condition"); |
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1784 } |
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1785 |
342 | 1786 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1787 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1788 assert(mr.start() == new_end, "post-condition"); | |
1789 | |
1790 _expansion_regions += num_regions_deleted; | |
1791 update_committed_space(old_end, new_end); | |
1792 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1793 g1_policy()->record_new_heap_size(n_regions()); |
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1794 } else { |
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1795 ergo_verbose0(ErgoHeapSizing, |
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1796 "did not shrink the heap", |
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1797 ergo_format_reason("heap shrinking operation failed")); |
342 | 1798 } |
1799 } | |
1800 | |
1801 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1802 verify_region_sets_optional(); |
1803 | |
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1804 // We should only reach here at the end of a Full GC which means we |
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1805 // should not not be holding to any GC alloc regions. The method |
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1806 // below will make sure of that and do any remaining clean up. |
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1807 abandon_gc_alloc_regions(); |
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1808 |
2152 | 1809 // Instead of tearing down / rebuilding the free lists here, we |
1810 // could instead use the remove_all_pending() method on free_list to | |
1811 // remove only the ones that we need to remove. | |
4072 | 1812 tear_down_region_sets(true /* free_list_only */); |
342 | 1813 shrink_helper(shrink_bytes); |
4072 | 1814 rebuild_region_sets(true /* free_list_only */); |
2152 | 1815 |
3766 | 1816 _hrs.verify_optional(); |
2152 | 1817 verify_region_sets_optional(); |
342 | 1818 } |
1819 | |
1820 // Public methods. | |
1821 | |
1822 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1823 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1824 #endif // _MSC_VER | |
1825 | |
1826 | |
1827 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1828 SharedHeap(policy_), | |
1829 _g1_policy(policy_), | |
1111 | 1830 _dirty_card_queue_set(false), |
1705 | 1831 _into_cset_dirty_card_queue_set(false), |
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1832 _is_alive_closure_cm(this), |
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1833 _is_alive_closure_stw(this), |
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1834 _ref_processor_cm(NULL), |
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1835 _ref_processor_stw(NULL), |
342 | 1836 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1837 _bot_shared(NULL), | |
1838 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1839 _evac_failure_scan_stack(NULL) , | |
1840 _mark_in_progress(false), | |
2152 | 1841 _cg1r(NULL), _summary_bytes_used(0), |
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1842 _g1mm(NULL), |
342 | 1843 _refine_cte_cl(NULL), |
1844 _full_collection(false), | |
2152 | 1845 _free_list("Master Free List"), |
1846 _secondary_free_list("Secondary Free List"), | |
4072 | 1847 _old_set("Old Set"), |
2152 | 1848 _humongous_set("Master Humongous Set"), |
1849 _free_regions_coming(false), | |
342 | 1850 _young_list(new YoungList(this)), |
1851 _gc_time_stamp(0), | |
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1852 _retained_old_gc_alloc_region(NULL), |
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1853 _expand_heap_after_alloc_failure(true), |
526 | 1854 _surviving_young_words(NULL), |
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1855 _full_collections_completed(0), |
526 | 1856 _in_cset_fast_test(NULL), |
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1857 _in_cset_fast_test_base(NULL), |
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1858 _dirty_cards_region_list(NULL), |
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1859 _worker_cset_start_region(NULL), |
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1860 _worker_cset_start_region_time_stamp(NULL) { |
342 | 1861 _g1h = this; // To catch bugs. |
1862 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1863 vm_exit_during_initialization("Failed necessary allocation."); | |
1864 } | |
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1865 |
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1866 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1867 |
342 | 1868 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1869 _task_queues = new RefToScanQueueSet(n_queues); | |
1870 | |
1871 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1872 assert(n_rem_sets > 0, "Invariant."); | |
1873 | |
1874 HeapRegionRemSetIterator** iter_arr = | |
1875 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1876 for (int i = 0; i < n_queues; i++) { | |
1877 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1878 } | |
1879 _rem_set_iterator = iter_arr; | |
1880 | |
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1881 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1882 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1883 |
342 | 1884 for (int i = 0; i < n_queues; i++) { |
1885 RefToScanQueue* q = new RefToScanQueue(); | |
1886 q->initialize(); | |
1887 _task_queues->register_queue(i, q); | |
1888 } | |
1889 | |
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1890 clear_cset_start_regions(); |
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1891 |
342 | 1892 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1893 } | |
1894 | |
1895 jint G1CollectedHeap::initialize() { | |
1166 | 1896 CollectedHeap::pre_initialize(); |
342 | 1897 os::enable_vtime(); |
1898 | |
1899 // Necessary to satisfy locking discipline assertions. | |
1900 | |
1901 MutexLocker x(Heap_lock); | |
1902 | |
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1903 // We have to initialize the printer before committing the heap, as |
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1904 // it will be used then. |
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1905 _hr_printer.set_active(G1PrintHeapRegions); |
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1906 |
342 | 1907 // While there are no constraints in the GC code that HeapWordSize |
1908 // be any particular value, there are multiple other areas in the | |
1909 // system which believe this to be true (e.g. oop->object_size in some | |
1910 // cases incorrectly returns the size in wordSize units rather than | |
1911 // HeapWordSize). | |
1912 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1913 | |
1914 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1915 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1916 | |
1917 // Ensure that the sizes are properly aligned. | |
1918 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1919 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1920 | |
1921 _cg1r = new ConcurrentG1Refine(); | |
1922 | |
1923 // Reserve the maximum. | |
1924 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1925 // Includes the perm-gen. | |
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1926 |
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1927 // When compressed oops are enabled, the preferred heap base |
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1928 // is calculated by subtracting the requested size from the |
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1929 // 32Gb boundary and using the result as the base address for |
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1930 // heap reservation. If the requested size is not aligned to |
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1931 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1932 // into the ReservedHeapSpace constructor) then the actual |
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1933 // base of the reserved heap may end up differing from the |
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1934 // address that was requested (i.e. the preferred heap base). |
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1935 // If this happens then we could end up using a non-optimal |
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1936 // compressed oops mode. |
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1937 |
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1938 // Since max_byte_size is aligned to the size of a heap region (checked |
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1939 // above), we also need to align the perm gen size as it might not be. |
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1940 const size_t total_reserved = max_byte_size + |
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1941 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1942 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1943 |
642
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1944 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1945 |
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1946 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1947 UseLargePages, addr); |
642
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1948 |
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1949 if (UseCompressedOops) { |
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1950 if (addr != NULL && !heap_rs.is_reserved()) { |
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1951 // Failed to reserve at specified address - the requested memory |
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1952 // region is taken already, for example, by 'java' launcher. |
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1953 // Try again to reserver heap higher. |
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1954 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1955 |
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1956 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1957 UseLargePages, addr); |
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1958 |
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1959 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1960 // Failed to reserve at specified address again - give up. |
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1961 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1962 assert(addr == NULL, ""); |
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1963 |
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1964 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1965 UseLargePages, addr); |
642
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1966 heap_rs = heap_rs1; |
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1967 } else { |
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1968 heap_rs = heap_rs0; |
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1969 } |
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1970 } |
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1971 } |
342 | 1972 |
1973 if (!heap_rs.is_reserved()) { | |
1974 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1975 return JNI_ENOMEM; | |
1976 } | |
1977 | |
1978 // It is important to do this in a way such that concurrent readers can't | |
1979 // temporarily think somethings in the heap. (I've actually seen this | |
1980 // happen in asserts: DLD.) | |
1981 _reserved.set_word_size(0); | |
1982 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1983 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1984 | |
1985 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1986 | |
1987 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1988 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1989 set_barrier_set(rem_set()->bs()); | |
1990 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1991 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1992 } else { | |
1993 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1994 return JNI_ENOMEM; | |
1995 } | |
1996 | |
1997 // Also create a G1 rem set. | |
1861 | 1998 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
1999 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 2000 } else { |
1861 | 2001 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
2002 return JNI_ENOMEM; | |
342 | 2003 } |
2004 | |
2005 // Carve out the G1 part of the heap. | |
2006 | |
2007 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2008 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2009 g1_rs.size()/HeapWordSize); | |
2010 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
2011 | |
2012 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
2013 | |
2014 _g1_storage.initialize(g1_rs, 0); | |
2015 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2016 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
2017 (HeapWord*) _g1_reserved.end(), | |
2018 _expansion_regions); | |
342 | 2019 |
807
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2020 // 6843694 - ensure that the maximum region index can fit |
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2021 // in the remembered set structures. |
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2022 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2023 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2024 |
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2025 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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2026 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
3986
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2027 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
942
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2028 "too many cards per region"); |
807
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2029 |
2152 | 2030 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2031 | |
342 | 2032 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2033 heap_word_size(init_byte_size)); | |
2034 | |
2035 _g1h = this; | |
2036 | |
1394
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2037 _in_cset_fast_test_length = max_regions(); |
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2038 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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2039 |
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2040 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2041 // beginning of the heap every time we want to index; basically |
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2042 // it's the same with what we do with the card table. |
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2043 _in_cset_fast_test = _in_cset_fast_test_base - |
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2044 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2045 |
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2046 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2047 // regions to the incremental collection set for the first |
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2048 // evacuation pause. |
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2049 clear_cset_fast_test(); |
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2050 |
342 | 2051 // Create the ConcurrentMark data structure and thread. |
2052 // (Must do this late, so that "max_regions" is defined.) | |
2053 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2054 _cmThread = _cm->cmThread(); | |
2055 | |
2056 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2057 HeapRegionRemSet::init_heap(max_regions()); | |
2058 | |
677 | 2059 // Now expand into the initial heap size. |
2188
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2060 if (!expand(init_byte_size)) { |
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2061 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2062 return JNI_ENOMEM; |
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2063 } |
342 | 2064 |
2065 // Perform any initialization actions delegated to the policy. | |
2066 g1_policy()->init(); | |
2067 | |
2068 _refine_cte_cl = | |
2069 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2070 g1_rem_set(), | |
2071 concurrent_g1_refine()); | |
2072 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2073 | |
2074 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2075 SATB_Q_FL_lock, | |
1111 | 2076 G1SATBProcessCompletedThreshold, |
342 | 2077 Shared_SATB_Q_lock); |
794 | 2078 |
2079 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2080 DirtyCardQ_FL_lock, | |
1111 | 2081 concurrent_g1_refine()->yellow_zone(), |
2082 concurrent_g1_refine()->red_zone(), | |
794 | 2083 Shared_DirtyCardQ_lock); |
2084 | |
616
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2085 if (G1DeferredRSUpdate) { |
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2086 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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2087 DirtyCardQ_FL_lock, |
1111 | 2088 -1, // never trigger processing |
2089 -1, // no limit on length | |
616
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2090 Shared_DirtyCardQ_lock, |
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2091 &JavaThread::dirty_card_queue_set()); |
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2092 } |
1705 | 2093 |
2094 // Initialize the card queue set used to hold cards containing | |
2095 // references into the collection set. | |
2096 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2097 DirtyCardQ_FL_lock, | |
2098 -1, // never trigger processing | |
2099 -1, // no limit on length | |
2100 Shared_DirtyCardQ_lock, | |
2101 &JavaThread::dirty_card_queue_set()); | |
2102 | |
342 | 2103 // In case we're keeping closure specialization stats, initialize those |
2104 // counts and that mechanism. | |
2105 SpecializationStats::clear(); | |
2106 | |
2107 // Do later initialization work for concurrent refinement. | |
2108 _cg1r->init(); | |
2109 | |
2433
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2110 // Here we allocate the dummy full region that is required by the |
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2111 // G1AllocRegion class. If we don't pass an address in the reserved |
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2112 // space here, lots of asserts fire. |
3766 | 2113 |
2114 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2115 _g1_reserved.start()); | |
2433
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2116 // We'll re-use the same region whether the alloc region will |
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2117 // require BOT updates or not and, if it doesn't, then a non-young |
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2118 // region will complain that it cannot support allocations without |
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2119 // BOT updates. So we'll tag the dummy region as young to avoid that. |
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|
2120 dummy_region->set_young(); |
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2121 // Make sure it's full. |
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2122 dummy_region->set_top(dummy_region->end()); |
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2123 G1AllocRegion::setup(this, dummy_region); |
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2124 |
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2125 init_mutator_alloc_region(); |
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2126 |
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2127 // Do create of the monitoring and management support so that |
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|
2128 // values in the heap have been properly initialized. |
3980
8229bd737950
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|
2129 _g1mm = new G1MonitoringSupport(this); |
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2130 |
342 | 2131 return JNI_OK; |
2132 } | |
2133 | |
2134 void G1CollectedHeap::ref_processing_init() { | |
1974
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diff
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|
2135 // Reference processing in G1 currently works as follows: |
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|
2136 // |
3979
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|
2137 // * There are two reference processor instances. One is |
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|
2138 // used to record and process discovered references |
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|
2139 // during concurrent marking; the other is used to |
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|
2140 // record and process references during STW pauses |
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|
2141 // (both full and incremental). |
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|
2142 // * Both ref processors need to 'span' the entire heap as |
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|
2143 // the regions in the collection set may be dotted around. |
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|
2144 // |
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|
2145 // * For the concurrent marking ref processor: |
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|
2146 // * Reference discovery is enabled at initial marking. |
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|
2147 // * Reference discovery is disabled and the discovered |
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|
2148 // references processed etc during remarking. |
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|
2149 // * Reference discovery is MT (see below). |
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2150 // * Reference discovery requires a barrier (see below). |
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2151 // * Reference processing may or may not be MT |
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2152 // (depending on the value of ParallelRefProcEnabled |
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|
2153 // and ParallelGCThreads). |
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|
2154 // * A full GC disables reference discovery by the CM |
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|
2155 // ref processor and abandons any entries on it's |
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|
2156 // discovered lists. |
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|
2157 // |
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2158 // * For the STW processor: |
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2159 // * Non MT discovery is enabled at the start of a full GC. |
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2160 // * Processing and enqueueing during a full GC is non-MT. |
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2161 // * During a full GC, references are processed after marking. |
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2162 // |
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2163 // * Discovery (may or may not be MT) is enabled at the start |
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2164 // of an incremental evacuation pause. |
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2165 // * References are processed near the end of a STW evacuation pause. |
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2166 // * For both types of GC: |
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2167 // * Discovery is atomic - i.e. not concurrent. |
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|
2168 // * Reference discovery will not need a barrier. |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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|
2169 |
342 | 2170 SharedHeap::ref_processing_init(); |
2171 MemRegion mr = reserved_region(); | |
3979
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|
2172 |
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|
2173 // Concurrent Mark ref processor |
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|
2174 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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|
2175 new ReferenceProcessor(mr, // span |
3979
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|
2176 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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|
2177 // mt processing |
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|
2178 (int) ParallelGCThreads, |
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|
2179 // degree of mt processing |
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|
2180 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
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|
2181 // mt discovery |
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|
2182 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
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|
2183 // degree of mt discovery |
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|
2184 false, |
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|
2185 // Reference discovery is not atomic |
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|
2186 &_is_alive_closure_cm, |
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|
2187 // is alive closure |
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|
2188 // (for efficiency/performance) |
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|
2189 true); |
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|
2190 // Setting next fields of discovered |
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|
2191 // lists requires a barrier. |
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|
2192 |
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|
2193 // STW ref processor |
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|
2194 _ref_processor_stw = |
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|
2195 new ReferenceProcessor(mr, // span |
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|
2196 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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|
2197 // mt processing |
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|
2198 MAX2((int)ParallelGCThreads, 1), |
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|
2199 // degree of mt processing |
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diff
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|
2200 (ParallelGCThreads > 1), |
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|
2201 // mt discovery |
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|
2202 MAX2((int)ParallelGCThreads, 1), |
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|
2203 // degree of mt discovery |
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diff
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|
2204 true, |
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diff
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|
2205 // Reference discovery is atomic |
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diff
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|
2206 &_is_alive_closure_stw, |
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|
2207 // is alive closure |
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diff
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|
2208 // (for efficiency/performance) |
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diff
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|
2209 false); |
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|
2210 // Setting next fields of discovered |
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|
2211 // lists requires a barrier. |
342 | 2212 } |
2213 | |
2214 size_t G1CollectedHeap::capacity() const { | |
2215 return _g1_committed.byte_size(); | |
2216 } | |
2217 | |
1705 | 2218 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2219 DirtyCardQueue* into_cset_dcq, | |
2220 bool concurrent, | |
342 | 2221 int worker_i) { |
889 | 2222 // Clean cards in the hot card cache |
1705 | 2223 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2224 |
342 | 2225 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2226 int n_completed_buffers = 0; | |
1705 | 2227 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2228 n_completed_buffers++; |
2229 } | |
2230 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2231 (double) n_completed_buffers); | |
2232 dcqs.clear_n_completed_buffers(); | |
2233 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2234 } | |
2235 | |
2236 | |
2237 // Computes the sum of the storage used by the various regions. | |
2238 | |
2239 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
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861
diff
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|
2240 assert(Heap_lock->owner() != NULL, |
36b5611220a7
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diff
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|
2241 "Should be owned on this thread's behalf."); |
342 | 2242 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
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|
2243 // Read only once in case it is set to NULL concurrently |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2244 HeapRegion* hr = _mutator_alloc_region.get(); |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2245 if (hr != NULL) |
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|
2246 result += hr->used(); |
342 | 2247 return result; |
2248 } | |
2249 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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diff
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|
2250 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2251 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2252 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2253 } |
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|
2254 |
342 | 2255 class SumUsedClosure: public HeapRegionClosure { |
2256 size_t _used; | |
2257 public: | |
2258 SumUsedClosure() : _used(0) {} | |
2259 bool doHeapRegion(HeapRegion* r) { | |
2260 if (!r->continuesHumongous()) { | |
2261 _used += r->used(); | |
2262 } | |
2263 return false; | |
2264 } | |
2265 size_t result() { return _used; } | |
2266 }; | |
2267 | |
2268 size_t G1CollectedHeap::recalculate_used() const { | |
2269 SumUsedClosure blk; | |
3766 | 2270 heap_region_iterate(&blk); |
342 | 2271 return blk.result(); |
2272 } | |
2273 | |
2274 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2275 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2276 // otherwise, is there space in the current allocation region? |
2277 | |
2278 // We need to store the current allocation region in a local variable | |
2279 // here. The problem is that this method doesn't take any locks and | |
2280 // there may be other threads which overwrite the current allocation | |
2281 // region field. attempt_allocation(), for example, sets it to NULL | |
2282 // and this can happen *after* the NULL check here but before the call | |
2283 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2284 // to be a problem in the optimized build, since the two loads of the | |
2285 // current allocation region field are optimized away. | |
2433
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|
2286 HeapRegion* hr = _mutator_alloc_region.get(); |
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2287 if (hr == NULL) { |
342 | 2288 return 0; |
2289 } | |
2433
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|
2290 return hr->free(); |
342 | 2291 } |
2292 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2293 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2294 return |
4e5661ba9d98
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1611
diff
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|
2295 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2296 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
4e5661ba9d98
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1611
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|
2297 } |
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diff
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|
2298 |
3285
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7011855: G1: non-product flag to artificially grow the heap
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|
2299 #ifndef PRODUCT |
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7011855: G1: non-product flag to artificially grow the heap
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|
2300 void G1CollectedHeap::allocate_dummy_regions() { |
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7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2301 // Let's fill up most of the region |
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|
2302 size_t word_size = HeapRegion::GrainWords - 1024; |
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7011855: G1: non-product flag to artificially grow the heap
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|
2303 // And as a result the region we'll allocate will be humongous. |
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7011855: G1: non-product flag to artificially grow the heap
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|
2304 guarantee(isHumongous(word_size), "sanity"); |
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7011855: G1: non-product flag to artificially grow the heap
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|
2305 |
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diff
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|
2306 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2307 // Let's use the existing mechanism for the allocation |
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7011855: G1: non-product flag to artificially grow the heap
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|
2308 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
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7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2309 if (dummy_obj != NULL) { |
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|
2310 MemRegion mr(dummy_obj, word_size); |
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|
2311 CollectedHeap::fill_with_object(mr); |
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7011855: G1: non-product flag to artificially grow the heap
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|
2312 } else { |
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|
2313 // If we can't allocate once, we probably cannot allocate |
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diff
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|
2314 // again. Let's get out of the loop. |
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|
2315 break; |
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|
2316 } |
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|
2317 } |
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|
2318 } |
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diff
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|
2319 #endif // !PRODUCT |
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2320 |
2030
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|
2321 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
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2322 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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2323 |
2030
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2324 // We assume that if concurrent == true, then the caller is a |
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2325 // concurrent thread that was joined the Suspendible Thread |
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2326 // Set. If there's ever a cheap way to check this, we should add an |
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|
2327 // assert here. |
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|
2328 |
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|
2329 // We have already incremented _total_full_collections at the start |
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2330 // of the GC, so total_full_collections() represents how many full |
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|
2331 // collections have been started. |
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|
2332 unsigned int full_collections_started = total_full_collections(); |
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|
2333 |
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|
2334 // Given that this method is called at the end of a Full GC or of a |
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2335 // concurrent cycle, and those can be nested (i.e., a Full GC can |
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|
2336 // interrupt a concurrent cycle), the number of full collections |
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|
2337 // completed should be either one (in the case where there was no |
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|
2338 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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|
2339 // behind the number of full collections started. |
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|
2340 |
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|
2341 // This is the case for the inner caller, i.e. a Full GC. |
2030
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|
2342 assert(concurrent || |
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|
2343 (full_collections_started == _full_collections_completed + 1) || |
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|
2344 (full_collections_started == _full_collections_completed + 2), |
2030
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|
2345 err_msg("for inner caller (Full GC): full_collections_started = %u " |
1656
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|
2346 "is inconsistent with _full_collections_completed = %u", |
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|
2347 full_collections_started, _full_collections_completed)); |
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|
2348 |
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|
2349 // This is the case for the outer caller, i.e. the concurrent cycle. |
2030
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|
2350 assert(!concurrent || |
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|
2351 (full_collections_started == _full_collections_completed + 1), |
2030
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|
2352 err_msg("for outer caller (concurrent cycle): " |
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|
2353 "full_collections_started = %u " |
1656
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|
2354 "is inconsistent with _full_collections_completed = %u", |
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|
2355 full_collections_started, _full_collections_completed)); |
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|
2356 |
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|
2357 _full_collections_completed += 1; |
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|
2358 |
1840
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|
2359 // We need to clear the "in_progress" flag in the CM thread before |
4e0094bc41fa
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|
2360 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
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|
2361 // is set) so that if a waiter requests another System.gc() it doesn't |
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|
2362 // incorrectly see that a marking cyle is still in progress. |
2030
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|
2363 if (concurrent) { |
1840
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|
2364 _cmThread->clear_in_progress(); |
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|
2365 } |
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|
2366 |
1656
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|
2367 // This notify_all() will ensure that a thread that called |
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|
2368 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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|
2369 // and it's waiting for a full GC to finish will be woken up. It is |
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|
2370 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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|
2371 FullGCCount_lock->notify_all(); |
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|
2372 } |
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|
2373 |
342 | 2374 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2375 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2376 GCCauseSetter gcs(this, cause); |
2377 switch (cause) { | |
2378 case GCCause::_heap_inspection: | |
2379 case GCCause::_heap_dump: { | |
2380 HandleMark hm; | |
2381 do_full_collection(false); // don't clear all soft refs | |
2382 break; | |
2383 } | |
2384 default: // XXX FIX ME | |
2385 ShouldNotReachHere(); // Unexpected use of this function | |
2386 } | |
2387 } | |
2388 | |
1088
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|
2389 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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|
2390 // The caller doesn't have the Heap_lock |
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|
2391 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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|
2392 |
1656
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|
2393 unsigned int gc_count_before; |
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|
2394 unsigned int full_gc_count_before; |
342 | 2395 { |
1088
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|
2396 MutexLocker ml(Heap_lock); |
1973 | 2397 |
1088
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|
2398 // Read the GC count while holding the Heap_lock |
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|
2399 gc_count_before = SharedHeap::heap()->total_collections(); |
1656
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|
2400 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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|
2401 } |
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|
2402 |
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|
2403 if (should_do_concurrent_full_gc(cause)) { |
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|
2404 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2405 // concurrent cycle. We're setting word_size to 0 which means that |
2406 // we are not requesting a post-GC allocation. | |
1656
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|
2407 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2408 0, /* word_size */ |
2409 true, /* should_initiate_conc_mark */ | |
1656
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|
2410 g1_policy()->max_pause_time_ms(), |
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diff
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|
2411 cause); |
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diff
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|
2412 VMThread::execute(&op); |
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|
2413 } else { |
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|
2414 if (cause == GCCause::_gc_locker |
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|
2415 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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|
2416 |
1973 | 2417 // Schedule a standard evacuation pause. We're setting word_size |
2418 // to 0 which means that we are not requesting a post-GC allocation. | |
1656
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|
2419 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2420 0, /* word_size */ |
1656
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|
2421 false, /* should_initiate_conc_mark */ |
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|
2422 g1_policy()->max_pause_time_ms(), |
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|
2423 cause); |
1088
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|
2424 VMThread::execute(&op); |
1656
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|
2425 } else { |
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diff
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|
2426 // Schedule a Full GC. |
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diff
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|
2427 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
1088
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|
2428 VMThread::execute(&op); |
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diff
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|
2429 } |
342 | 2430 } |
2431 } | |
2432 | |
2433 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2434 if (_g1_committed.contains(p)) { |
2435 // Given that we know that p is in the committed space, | |
2436 // heap_region_containing_raw() should successfully | |
2437 // return the containing region. | |
2438 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2439 return hr->is_in(p); |
2440 } else { | |
2441 return _perm_gen->as_gen()->is_in(p); | |
2442 } | |
2443 } | |
2444 | |
2445 // Iteration functions. | |
2446 | |
2447 // Iterates an OopClosure over all ref-containing fields of objects | |
2448 // within a HeapRegion. | |
2449 | |
2450 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2451 MemRegion _mr; | |
2452 OopClosure* _cl; | |
2453 public: | |
2454 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2455 : _mr(mr), _cl(cl) {} | |
2456 bool doHeapRegion(HeapRegion* r) { | |
2457 if (! r->continuesHumongous()) { | |
2458 r->oop_iterate(_cl); | |
2459 } | |
2460 return false; | |
2461 } | |
2462 }; | |
2463 | |
678 | 2464 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2465 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2466 heap_region_iterate(&blk); |
678 | 2467 if (do_perm) { |
2468 perm_gen()->oop_iterate(cl); | |
2469 } | |
342 | 2470 } |
2471 | |
678 | 2472 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2473 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2474 heap_region_iterate(&blk); |
678 | 2475 if (do_perm) { |
2476 perm_gen()->oop_iterate(cl); | |
2477 } | |
342 | 2478 } |
2479 | |
2480 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2481 | |
2482 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2483 ObjectClosure* _cl; | |
2484 public: | |
2485 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2486 bool doHeapRegion(HeapRegion* r) { | |
2487 if (! r->continuesHumongous()) { | |
2488 r->object_iterate(_cl); | |
2489 } | |
2490 return false; | |
2491 } | |
2492 }; | |
2493 | |
678 | 2494 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2495 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2496 heap_region_iterate(&blk); |
678 | 2497 if (do_perm) { |
2498 perm_gen()->object_iterate(cl); | |
2499 } | |
342 | 2500 } |
2501 | |
2502 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2503 // FIXME: is this right? | |
2504 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2505 } | |
2506 | |
2507 // Calls a SpaceClosure on a HeapRegion. | |
2508 | |
2509 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2510 SpaceClosure* _cl; | |
2511 public: | |
2512 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2513 bool doHeapRegion(HeapRegion* r) { | |
2514 _cl->do_space(r); | |
2515 return false; | |
2516 } | |
2517 }; | |
2518 | |
2519 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2520 SpaceClosureRegionClosure blk(cl); | |
3766 | 2521 heap_region_iterate(&blk); |
342 | 2522 } |
2523 | |
3766 | 2524 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2525 _hrs.iterate(cl); | |
342 | 2526 } |
2527 | |
2528 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2529 HeapRegionClosure* cl) const { |
2530 _hrs.iterate_from(r, cl); | |
342 | 2531 } |
2532 | |
2533 void | |
2534 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
4728
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|
2535 uint worker, |
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4711
diff
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|
2536 uint no_of_par_workers, |
342 | 2537 jint claim_value) { |
355 | 2538 const size_t regions = n_regions(); |
4728
441e946dc1af
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4711
diff
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|
2539 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
4095
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diff
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|
2540 no_of_par_workers : |
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4090
diff
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|
2541 1); |
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2542 assert(UseDynamicNumberOfGCThreads || |
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2543 no_of_par_workers == workers()->total_workers(), |
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2544 "Non dynamic should use fixed number of workers"); |
355 | 2545 // try to spread out the starting points of the workers |
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2546 const size_t start_index = regions / max_workers * (size_t) worker; |
355 | 2547 |
2548 // each worker will actually look at all regions | |
2549 for (size_t count = 0; count < regions; ++count) { | |
2550 const size_t index = (start_index + count) % regions; | |
2551 assert(0 <= index && index < regions, "sanity"); | |
2552 HeapRegion* r = region_at(index); | |
2553 // we'll ignore "continues humongous" regions (we'll process them | |
2554 // when we come across their corresponding "start humongous" | |
2555 // region) and regions already claimed | |
2556 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2557 continue; | |
2558 } | |
2559 // OK, try to claim it | |
342 | 2560 if (r->claimHeapRegion(claim_value)) { |
355 | 2561 // success! |
2562 assert(!r->continuesHumongous(), "sanity"); | |
2563 if (r->startsHumongous()) { | |
2564 // If the region is "starts humongous" we'll iterate over its | |
2565 // "continues humongous" first; in fact we'll do them | |
2566 // first. The order is important. In on case, calling the | |
2567 // closure on the "starts humongous" region might de-allocate | |
2568 // and clear all its "continues humongous" regions and, as a | |
2569 // result, we might end up processing them twice. So, we'll do | |
2570 // them first (notice: most closures will ignore them anyway) and | |
2571 // then we'll do the "starts humongous" region. | |
2572 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2573 HeapRegion* chr = region_at(ch_index); | |
2574 | |
2575 // if the region has already been claimed or it's not | |
2576 // "continues humongous" we're done | |
2577 if (chr->claim_value() == claim_value || | |
2578 !chr->continuesHumongous()) { | |
2579 break; | |
2580 } | |
2581 | |
2582 // Noone should have claimed it directly. We can given | |
2583 // that we claimed its "starts humongous" region. | |
2584 assert(chr->claim_value() != claim_value, "sanity"); | |
2585 assert(chr->humongous_start_region() == r, "sanity"); | |
2586 | |
2587 if (chr->claimHeapRegion(claim_value)) { | |
2588 // we should always be able to claim it; noone else should | |
2589 // be trying to claim this region | |
2590 | |
2591 bool res2 = cl->doHeapRegion(chr); | |
2592 assert(!res2, "Should not abort"); | |
2593 | |
2594 // Right now, this holds (i.e., no closure that actually | |
2595 // does something with "continues humongous" regions | |
2596 // clears them). We might have to weaken it in the future, | |
2597 // but let's leave these two asserts here for extra safety. | |
2598 assert(chr->continuesHumongous(), "should still be the case"); | |
2599 assert(chr->humongous_start_region() == r, "sanity"); | |
2600 } else { | |
2601 guarantee(false, "we should not reach here"); | |
2602 } | |
2603 } | |
2604 } | |
2605 | |
2606 assert(!r->continuesHumongous(), "sanity"); | |
2607 bool res = cl->doHeapRegion(r); | |
2608 assert(!res, "Should not abort"); | |
2609 } | |
2610 } | |
2611 } | |
2612 | |
390 | 2613 class ResetClaimValuesClosure: public HeapRegionClosure { |
2614 public: | |
2615 bool doHeapRegion(HeapRegion* r) { | |
2616 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2617 return false; | |
2618 } | |
2619 }; | |
2620 | |
2621 void | |
2622 G1CollectedHeap::reset_heap_region_claim_values() { | |
2623 ResetClaimValuesClosure blk; | |
2624 heap_region_iterate(&blk); | |
2625 } | |
2626 | |
355 | 2627 #ifdef ASSERT |
2628 // This checks whether all regions in the heap have the correct claim | |
2629 // value. I also piggy-backed on this a check to ensure that the | |
2630 // humongous_start_region() information on "continues humongous" | |
2631 // regions is correct. | |
2632 | |
2633 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2634 private: | |
2635 jint _claim_value; | |
2636 size_t _failures; | |
2637 HeapRegion* _sh_region; | |
2638 public: | |
2639 CheckClaimValuesClosure(jint claim_value) : | |
2640 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2641 bool doHeapRegion(HeapRegion* r) { | |
2642 if (r->claim_value() != _claim_value) { | |
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2643 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2644 "claim value = %d, should be %d", |
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2645 HR_FORMAT_PARAMS(r), |
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2646 r->claim_value(), _claim_value); |
355 | 2647 ++_failures; |
2648 } | |
2649 if (!r->isHumongous()) { | |
2650 _sh_region = NULL; | |
2651 } else if (r->startsHumongous()) { | |
2652 _sh_region = r; | |
2653 } else if (r->continuesHumongous()) { | |
2654 if (r->humongous_start_region() != _sh_region) { | |
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2655 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2656 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2657 HR_FORMAT_PARAMS(r), |
355 | 2658 r->humongous_start_region(), |
2659 _sh_region); | |
2660 ++_failures; | |
342 | 2661 } |
2662 } | |
355 | 2663 return false; |
2664 } | |
2665 size_t failures() { | |
2666 return _failures; | |
2667 } | |
2668 }; | |
2669 | |
2670 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2671 CheckClaimValuesClosure cl(claim_value); | |
2672 heap_region_iterate(&cl); | |
2673 return cl.failures() == 0; | |
2674 } | |
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2675 |
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2676 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2677 jint _claim_value; |
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2678 size_t _failures; |
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2679 |
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2680 public: |
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2681 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2682 _claim_value(claim_value), |
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2683 _failures(0) { } |
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2684 |
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2685 size_t failures() { |
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2686 return _failures; |
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2687 } |
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2688 |
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2689 bool doHeapRegion(HeapRegion* hr) { |
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2690 assert(hr->in_collection_set(), "how?"); |
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2691 assert(!hr->isHumongous(), "H-region in CSet"); |
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2692 if (hr->claim_value() != _claim_value) { |
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2693 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2694 "claim value = %d, should be %d", |
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2695 HR_FORMAT_PARAMS(hr), |
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2696 hr->claim_value(), _claim_value); |
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2697 _failures += 1; |
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2698 } |
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2699 return false; |
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2700 } |
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2701 }; |
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2702 |
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2703 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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2704 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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2705 collection_set_iterate(&cl); |
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2706 return cl.failures() == 0; |
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2707 } |
355 | 2708 #endif // ASSERT |
342 | 2709 |
4709
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2710 // Clear the cached CSet starting regions and (more importantly) |
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2711 // the time stamps. Called when we reset the GC time stamp. |
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2712 void G1CollectedHeap::clear_cset_start_regions() { |
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2713 assert(_worker_cset_start_region != NULL, "sanity"); |
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2714 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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2715 |
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2716 int n_queues = MAX2((int)ParallelGCThreads, 1); |
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2717 for (int i = 0; i < n_queues; i++) { |
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2718 _worker_cset_start_region[i] = NULL; |
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2719 _worker_cset_start_region_time_stamp[i] = 0; |
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2720 } |
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2721 } |
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2722 |
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2723 // Given the id of a worker, obtain or calculate a suitable |
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2724 // starting region for iterating over the current collection set. |
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2725 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
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2726 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
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2727 |
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2728 HeapRegion* result = NULL; |
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2729 unsigned gc_time_stamp = get_gc_time_stamp(); |
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2730 |
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2731 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
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2732 // Cached starting region for current worker was set |
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2733 // during the current pause - so it's valid. |
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2734 // Note: the cached starting heap region may be NULL |
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2735 // (when the collection set is empty). |
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2736 result = _worker_cset_start_region[worker_i]; |
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2737 assert(result == NULL || result->in_collection_set(), "sanity"); |
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2738 return result; |
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|
2739 } |
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2740 |
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2741 // The cached entry was not valid so let's calculate |
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2742 // a suitable starting heap region for this worker. |
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2743 |
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2744 // We want the parallel threads to start their collection |
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2745 // set iteration at different collection set regions to |
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2746 // avoid contention. |
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|
2747 // If we have: |
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2748 // n collection set regions |
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|
2749 // p threads |
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|
2750 // Then thread t will start at region floor ((t * n) / p) |
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2751 |
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2752 result = g1_policy()->collection_set(); |
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2753 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2754 size_t cs_size = g1_policy()->cset_region_length(); |
4728
441e946dc1af
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2755 uint active_workers = workers()->active_workers(); |
4709
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2756 assert(UseDynamicNumberOfGCThreads || |
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|
2757 active_workers == workers()->total_workers(), |
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|
2758 "Unless dynamic should use total workers"); |
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|
2759 |
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|
2760 size_t end_ind = (cs_size * worker_i) / active_workers; |
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|
2761 size_t start_ind = 0; |
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
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4708
diff
changeset
|
2762 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
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4708
diff
changeset
|
2763 if (worker_i > 0 && |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2764 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2765 // Previous workers starting region is valid |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2766 // so let's iterate from there |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2767 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2768 result = _worker_cset_start_region[worker_i - 1]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2769 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2770 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2771 for (size_t i = start_ind; i < end_ind; i++) { |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2772 result = result->next_in_collection_set(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2773 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2774 } |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2775 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2776 // Note: the calculated starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2777 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
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changeset
|
2778 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2779 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2780 "should be updated only once per pause"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2781 _worker_cset_start_region[worker_i] = result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2782 OrderAccess::storestore(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2783 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2784 return result; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
2785 } |
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|
2786 |
342 | 2787 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2788 HeapRegion* r = g1_policy()->collection_set(); | |
2789 while (r != NULL) { | |
2790 HeapRegion* next = r->next_in_collection_set(); | |
2791 if (cl->doHeapRegion(r)) { | |
2792 cl->incomplete(); | |
2793 return; | |
2794 } | |
2795 r = next; | |
2796 } | |
2797 } | |
2798 | |
2799 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2800 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2801 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2802 // The CSet is empty so there's nothing to do. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
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diff
changeset
|
2803 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2804 } |
4e5661ba9d98
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tonyp
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diff
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|
2805 |
342 | 2806 assert(r->in_collection_set(), |
2807 "Start region must be a member of the collection set."); | |
2808 HeapRegion* cur = r; | |
2809 while (cur != NULL) { | |
2810 HeapRegion* next = cur->next_in_collection_set(); | |
2811 if (cl->doHeapRegion(cur) && false) { | |
2812 cl->incomplete(); | |
2813 return; | |
2814 } | |
2815 cur = next; | |
2816 } | |
2817 cur = g1_policy()->collection_set(); | |
2818 while (cur != r) { | |
2819 HeapRegion* next = cur->next_in_collection_set(); | |
2820 if (cl->doHeapRegion(cur) && false) { | |
2821 cl->incomplete(); | |
2822 return; | |
2823 } | |
2824 cur = next; | |
2825 } | |
2826 } | |
2827 | |
2828 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2829 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2830 } |
2831 | |
2832 | |
2833 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2834 Space* res = heap_region_containing(addr); | |
2835 if (res == NULL) | |
2836 res = perm_gen()->space_containing(addr); | |
2837 return res; | |
2838 } | |
2839 | |
2840 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2841 Space* sp = space_containing(addr); | |
2842 if (sp != NULL) { | |
2843 return sp->block_start(addr); | |
2844 } | |
2845 return NULL; | |
2846 } | |
2847 | |
2848 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2849 Space* sp = space_containing(addr); | |
2850 assert(sp != NULL, "block_size of address outside of heap"); | |
2851 return sp->block_size(addr); | |
2852 } | |
2853 | |
2854 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2855 Space* sp = space_containing(addr); | |
2856 return sp->block_is_obj(addr); | |
2857 } | |
2858 | |
2859 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2860 return true; | |
2861 } | |
2862 | |
2863 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2864 return HeapRegion::GrainBytes; | |
2865 } | |
2866 | |
2867 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2868 // Return the remaining space in the cur alloc region, but not less than | |
2869 // the min TLAB size. | |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
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diff
changeset
|
2870 |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
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parents:
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diff
changeset
|
2871 // Also, this value can be at most the humongous object threshold, |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
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diff
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|
2872 // since we can't allow tlabs to grow big enough to accomodate |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
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diff
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|
2873 // humongous objects. |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
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parents:
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diff
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|
2874 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2875 HeapRegion* hr = _mutator_alloc_region.get(); |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
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diff
changeset
|
2876 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2877 if (hr == NULL) { |
1313
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6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
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parents:
1282
diff
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|
2878 return max_tlab_size; |
342 | 2879 } else { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2880 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2881 } |
2882 } | |
2883 | |
2884 size_t G1CollectedHeap::max_capacity() const { | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2885 return _g1_reserved.byte_size(); |
342 | 2886 } |
2887 | |
2888 jlong G1CollectedHeap::millis_since_last_gc() { | |
2889 // assert(false, "NYI"); | |
2890 return 0; | |
2891 } | |
2892 | |
2893 void G1CollectedHeap::prepare_for_verify() { | |
2894 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2895 ensure_parsability(false); | |
2896 } | |
2897 g1_rem_set()->prepare_for_verify(); | |
2898 } | |
2899 | |
2900 class VerifyLivenessOopClosure: public OopClosure { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2901 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
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diff
changeset
|
2902 VerifyOption _vo; |
342 | 2903 public: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2904 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2905 _g1h(g1h), _vo(vo) |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2906 { } |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2907 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
|
2908 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
|
2909 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2910 template <class T> void do_oop_work(T *p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2911 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2912 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2913 "Dead object referenced by a not dead object"); |
342 | 2914 } |
2915 }; | |
2916 | |
2917 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2918 private: |
342 | 2919 G1CollectedHeap* _g1h; |
2920 size_t _live_bytes; | |
2921 HeapRegion *_hr; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2922 VerifyOption _vo; |
342 | 2923 public: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2924 // _vo == UsePrevMarking -> use "prev" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2925 // _vo == UseNextMarking -> use "next" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2926 // _vo == UseMarkWord -> use mark word from object header. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2927 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2928 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2929 _g1h = G1CollectedHeap::heap(); |
2930 } | |
2931 void do_object(oop o) { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2932 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2933 assert(o != NULL, "Huh?"); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2934 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2935 // If the object is alive according to the mark word, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2936 // then verify that the marking information agrees. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2937 // Note we can't verify the contra-positive of the |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2938 // above: if the object is dead (according to the mark |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2939 // word), it may not be marked, or may have been marked |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2940 // but has since became dead, or may have been allocated |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2941 // since the last marking. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2942 if (_vo == VerifyOption_G1UseMarkWord) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2943 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2944 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2945 |
342 | 2946 o->oop_iterate(&isLive); |
1389
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
2947 if (!_hr->obj_allocated_since_prev_marking(o)) { |
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
2948 size_t obj_size = o->size(); // Make sure we don't overflow |
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
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parents:
1388
diff
changeset
|
2949 _live_bytes += (obj_size * HeapWordSize); |
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
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1388
diff
changeset
|
2950 } |
342 | 2951 } |
2952 } | |
2953 size_t live_bytes() { return _live_bytes; } | |
2954 }; | |
2955 | |
2956 class PrintObjsInRegionClosure : public ObjectClosure { | |
2957 HeapRegion *_hr; | |
2958 G1CollectedHeap *_g1; | |
2959 public: | |
2960 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2961 _g1 = G1CollectedHeap::heap(); | |
2962 }; | |
2963 | |
2964 void do_object(oop o) { | |
2965 if (o != NULL) { | |
2966 HeapWord *start = (HeapWord *) o; | |
2967 size_t word_sz = o->size(); | |
2968 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2969 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2970 (void*) o, word_sz, | |
2971 _g1->isMarkedPrev(o), | |
2972 _g1->isMarkedNext(o), | |
2973 _hr->obj_allocated_since_prev_marking(o)); | |
2974 HeapWord *end = start + word_sz; | |
2975 HeapWord *cur; | |
2976 int *val; | |
2977 for (cur = start; cur < end; cur++) { | |
2978 val = (int *) cur; | |
2979 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2980 } | |
2981 } | |
2982 } | |
2983 }; | |
2984 | |
2985 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2986 private: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2987 bool _allow_dirty; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2988 bool _par; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2989 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2990 bool _failures; |
811 | 2991 public: |
3772
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diff
changeset
|
2992 // _vo == UsePrevMarking -> use "prev" marking information, |
6747fd0512e0
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diff
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|
2993 // _vo == UseNextMarking -> use "next" marking information, |
6747fd0512e0
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diff
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|
2994 // _vo == UseMarkWord -> use mark word from object header. |
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diff
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|
2995 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2996 : _allow_dirty(allow_dirty), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2997 _par(par), |
3772
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3766
diff
changeset
|
2998 _vo(vo), |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
2999 _failures(false) {} |
ff2402f6a50b
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1019
diff
changeset
|
3000 |
ff2402f6a50b
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1019
diff
changeset
|
3001 bool failures() { |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3002 return _failures; |
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3003 } |
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3004 |
342 | 3005 bool doHeapRegion(HeapRegion* r) { |
390 | 3006 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
3007 "Should be unclaimed at verify points."); | |
637
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3008 if (!r->continuesHumongous()) { |
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3009 bool failures = false; |
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3010 r->verify(_allow_dirty, _vo, &failures); |
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|
3011 if (failures) { |
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|
3012 _failures = true; |
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|
3013 } else { |
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3014 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
1020
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3015 r->object_iterate(¬_dead_yet_cl); |
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3016 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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3017 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
3018 "max_live_bytes "SIZE_FORMAT" " |
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|
3019 "< calculated "SIZE_FORMAT, |
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3020 r->bottom(), r->end(), |
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|
3021 r->max_live_bytes(), |
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|
3022 not_dead_yet_cl.live_bytes()); |
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3023 _failures = true; |
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|
3024 } |
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3025 } |
342 | 3026 } |
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3027 return false; // stop the region iteration if we hit a failure |
342 | 3028 } |
3029 }; | |
3030 | |
3031 class VerifyRootsClosure: public OopsInGenClosure { | |
3032 private: | |
3033 G1CollectedHeap* _g1h; | |
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3034 VerifyOption _vo; |
342 | 3035 bool _failures; |
3036 public: | |
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3037 // _vo == UsePrevMarking -> use "prev" marking information, |
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3038 // _vo == UseNextMarking -> use "next" marking information, |
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3039 // _vo == UseMarkWord -> use mark word from object header. |
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3040 VerifyRootsClosure(VerifyOption vo) : |
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3041 _g1h(G1CollectedHeap::heap()), |
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3042 _vo(vo), |
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3043 _failures(false) { } |
342 | 3044 |
3045 bool failures() { return _failures; } | |
3046 | |
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3047 template <class T> void do_oop_nv(T* p) { |
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3048 T heap_oop = oopDesc::load_heap_oop(p); |
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3049 if (!oopDesc::is_null(heap_oop)) { |
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3050 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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3051 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 3052 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
1020
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3053 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
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|
3054 if (_vo == VerifyOption_G1UseMarkWord) { |
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3055 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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3056 } |
342 | 3057 obj->print_on(gclog_or_tty); |
3058 _failures = true; | |
3059 } | |
3060 } | |
3061 } | |
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3062 |
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3063 void do_oop(oop* p) { do_oop_nv(p); } |
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|
3064 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 3065 }; |
3066 | |
390 | 3067 // This is the task used for parallel heap verification. |
3068 | |
3069 class G1ParVerifyTask: public AbstractGangTask { | |
3070 private: | |
3071 G1CollectedHeap* _g1h; | |
3772
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|
3072 bool _allow_dirty; |
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|
3073 VerifyOption _vo; |
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|
3074 bool _failures; |
390 | 3075 |
3076 public: | |
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3077 // _vo == UsePrevMarking -> use "prev" marking information, |
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3078 // _vo == UseNextMarking -> use "next" marking information, |
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3079 // _vo == UseMarkWord -> use mark word from object header. |
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3080 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 3081 AbstractGangTask("Parallel verify task"), |
845
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3082 _g1h(g1h), |
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3083 _allow_dirty(allow_dirty), |
3772
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|
3084 _vo(vo), |
1020
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|
3085 _failures(false) { } |
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|
3086 |
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|
3087 bool failures() { |
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|
3088 return _failures; |
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|
3089 } |
390 | 3090 |
4728
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7121618: Change type of number of GC workers to unsigned int.
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|
3091 void work(uint worker_id) { |
637
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|
3092 HandleMark hm; |
3772
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|
3093 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
4728
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|
3094 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
4095
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|
3095 _g1h->workers()->active_workers(), |
390 | 3096 HeapRegion::ParVerifyClaimValue); |
1020
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|
3097 if (blk.failures()) { |
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changeset
|
3098 _failures = true; |
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|
3099 } |
390 | 3100 } |
3101 }; | |
3102 | |
342 | 3103 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
3772
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|
3104 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 3105 } |
3106 | |
3107 void G1CollectedHeap::verify(bool allow_dirty, | |
3108 bool silent, | |
3772
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|
3109 VerifyOption vo) { |
342 | 3110 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
3293
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|
3111 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
3772
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|
3112 VerifyRootsClosure rootsCl(vo); |
4095
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|
3113 |
bca17e38de00
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|
3114 assert(Thread::current()->is_VM_thread(), |
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|
3115 "Expected to be executed serially by the VM thread at this point"); |
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|
3116 |
989
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|
3117 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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|
3118 |
3293
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|
3119 // We apply the relevant closures to all the oops in the |
1f4413413144
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|
3120 // system dictionary, the string table and the code cache. |
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|
3121 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
3772
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|
3122 |
3293
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|
3123 process_strong_roots(true, // activate StrongRootsScope |
1f4413413144
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|
3124 true, // we set "collecting perm gen" to true, |
1f4413413144
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|
3125 // so we don't reset the dirty cards in the perm gen. |
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diff
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|
3126 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 3127 &rootsCl, |
989
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|
3128 &blobsCl, |
342 | 3129 &rootsCl); |
3772
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|
3130 |
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|
3131 // If we're verifying after the marking phase of a Full GC then we can't |
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|
3132 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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|
3133 // the perm gen may be dead and hence not marked. If one of these dead |
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|
3134 // objects is considered to be a root then we may end up with a false |
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|
3135 // "Root location <x> points to dead ob <y>" failure. |
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|
3136 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3137 // Since we used "collecting_perm_gen" == true above, we will not have |
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|
3138 // checked the refs from perm into the G1-collected heap. We check those |
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|
3139 // references explicitly below. Whether the relevant cards are dirty |
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|
3140 // is checked further below in the rem set verification. |
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|
3141 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
3142 perm_gen()->oop_iterate(&rootsCl); |
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|
3143 } |
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|
3144 bool failures = rootsCl.failures(); |
3772
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|
3145 |
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|
3146 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3147 // If we're verifying during a full GC then the region sets |
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|
3148 // will have been torn down at the start of the GC. Therefore |
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|
3149 // verifying the region sets will fail. So we only verify |
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diff
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|
3150 // the region sets when not in a full GC. |
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changeset
|
3151 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
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diff
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|
3152 verify_region_sets(); |
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|
3153 } |
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|
3154 |
2152 | 3155 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3156 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3157 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3158 "sanity check"); | |
3159 | |
3772
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|
3160 G1ParVerifyTask task(this, allow_dirty, vo); |
4095
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|
3161 assert(UseDynamicNumberOfGCThreads || |
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|
3162 workers()->active_workers() == workers()->total_workers(), |
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|
3163 "If not dynamic should be using all the workers"); |
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3164 int n_workers = workers()->active_workers(); |
390 | 3165 set_par_threads(n_workers); |
3166 workers()->run_task(&task); | |
3167 set_par_threads(0); | |
1020
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3168 if (task.failures()) { |
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3169 failures = true; |
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3170 } |
390 | 3171 |
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3172 // Checks that the expected amount of parallel work was done. |
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3173 // The implication is that n_workers is > 0. |
390 | 3174 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3175 "sanity check"); | |
3176 | |
3177 reset_heap_region_claim_values(); | |
3178 | |
3179 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3180 "sanity check"); | |
3181 } else { | |
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3182 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 3183 heap_region_iterate(&blk); |
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3184 if (blk.failures()) { |
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3185 failures = true; |
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3186 } |
390 | 3187 } |
2152 | 3188 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3189 rem_set()->verify(); |
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3190 |
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3191 if (failures) { |
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3192 gclog_or_tty->print_cr("Heap:"); |
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3193 // It helps to have the per-region information in the output to |
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3194 // help us track down what went wrong. This is why we call |
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3195 // print_extended_on() instead of print_on(). |
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3196 print_extended_on(gclog_or_tty); |
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3197 gclog_or_tty->print_cr(""); |
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3198 #ifndef PRODUCT |
1044 | 3199 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3200 concurrent_mark()->print_reachable("at-verification-failure", |
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3201 vo, false /* all */); |
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3202 } |
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3203 #endif |
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3204 gclog_or_tty->flush(); |
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3205 } |
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3206 guarantee(!failures, "there should not have been any failures"); |
342 | 3207 } else { |
3208 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3209 } | |
3210 } | |
3211 | |
3212 class PrintRegionClosure: public HeapRegionClosure { | |
3213 outputStream* _st; | |
3214 public: | |
3215 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3216 bool doHeapRegion(HeapRegion* r) { | |
3217 r->print_on(_st); | |
3218 return false; | |
3219 } | |
3220 }; | |
3221 | |
3222 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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3223 st->print(" %-20s", "garbage-first heap"); |
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3224 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
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3225 capacity()/K, used_unlocked()/K); |
838
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3226 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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3227 _g1_storage.low_boundary(), |
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3228 _g1_storage.high(), |
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3229 _g1_storage.high_boundary()); |
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3230 st->cr(); |
3986
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|
3231 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
838
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3232 size_t young_regions = _young_list->length(); |
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3233 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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3234 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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3235 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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3236 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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3237 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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3238 st->cr(); |
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3239 perm()->as_gen()->print_on(st); |
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|
3240 } |
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|
3241 |
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3242 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
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3243 print_on(st); |
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|
3244 |
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3245 // Print the per-region information. |
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|
3246 st->cr(); |
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3247 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), HS=humongous(starts), HC=humongous(continues), CS=collection set, F=free, TS=gc time stamp, PTAMS=previous top-at-mark-start, NTAMS=next top-at-mark-start)"); |
342 | 3248 PrintRegionClosure blk(st); |
3766 | 3249 heap_region_iterate(&blk); |
342 | 3250 } |
3251 | |
3252 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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|
3253 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3254 workers()->print_worker_threads_on(st); |
3255 } | |
3256 _cmThread->print_on(st); | |
342 | 3257 st->cr(); |
1019 | 3258 _cm->print_worker_threads_on(st); |
3259 _cg1r->print_worker_threads_on(st); | |
342 | 3260 st->cr(); |
3261 } | |
3262 | |
3263 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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3264 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3265 workers()->threads_do(tc); |
3266 } | |
3267 tc->do_thread(_cmThread); | |
794 | 3268 _cg1r->threads_do(tc); |
342 | 3269 } |
3270 | |
3271 void G1CollectedHeap::print_tracing_info() const { | |
3272 // We'll overload this to mean "trace GC pause statistics." | |
3273 if (TraceGen0Time || TraceGen1Time) { | |
3274 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3275 // to that. | |
3276 g1_policy()->print_tracing_info(); | |
3277 } | |
751 | 3278 if (G1SummarizeRSetStats) { |
342 | 3279 g1_rem_set()->print_summary_info(); |
3280 } | |
1282 | 3281 if (G1SummarizeConcMark) { |
342 | 3282 concurrent_mark()->print_summary_info(); |
3283 } | |
3284 g1_policy()->print_yg_surv_rate_info(); | |
3285 SpecializationStats::print(); | |
3286 } | |
3287 | |
3777
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|
3288 #ifndef PRODUCT |
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|
3289 // Helpful for debugging RSet issues. |
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|
3290 |
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|
3291 class PrintRSetsClosure : public HeapRegionClosure { |
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|
3292 private: |
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|
3293 const char* _msg; |
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|
3294 size_t _occupied_sum; |
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|
3295 |
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|
3296 public: |
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|
3297 bool doHeapRegion(HeapRegion* r) { |
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|
3298 HeapRegionRemSet* hrrs = r->rem_set(); |
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|
3299 size_t occupied = hrrs->occupied(); |
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|
3300 _occupied_sum += occupied; |
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|
3301 |
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|
3302 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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|
3303 HR_FORMAT_PARAMS(r)); |
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|
3304 if (occupied == 0) { |
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|
3305 gclog_or_tty->print_cr(" RSet is empty"); |
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|
3306 } else { |
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|
3307 hrrs->print(); |
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|
3308 } |
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|
3309 gclog_or_tty->print_cr("----------"); |
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|
3310 return false; |
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|
3311 } |
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|
3312 |
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|
3313 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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|
3314 gclog_or_tty->cr(); |
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|
3315 gclog_or_tty->print_cr("========================================"); |
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|
3316 gclog_or_tty->print_cr(msg); |
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|
3317 gclog_or_tty->cr(); |
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|
3318 } |
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|
3319 |
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|
3320 ~PrintRSetsClosure() { |
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|
3321 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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|
3322 gclog_or_tty->print_cr("========================================"); |
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|
3323 gclog_or_tty->cr(); |
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|
3324 } |
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|
3325 }; |
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|
3326 |
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|
3327 void G1CollectedHeap::print_cset_rsets() { |
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|
3328 PrintRSetsClosure cl("Printing CSet RSets"); |
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|
3329 collection_set_iterate(&cl); |
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|
3330 } |
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|
3331 |
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|
3332 void G1CollectedHeap::print_all_rsets() { |
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|
3333 PrintRSetsClosure cl("Printing All RSets");; |
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|
3334 heap_region_iterate(&cl); |
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|
3335 } |
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|
3336 #endif // PRODUCT |
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|
3337 |
342 | 3338 G1CollectedHeap* G1CollectedHeap::heap() { |
3339 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3340 "not a garbage-first heap"); | |
3341 return _g1h; | |
3342 } | |
3343 | |
3344 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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|
3345 // always_do_update_barrier = false; |
342 | 3346 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3347 // Call allocation profiler | |
3348 AllocationProfiler::iterate_since_last_gc(); | |
3349 // Fill TLAB's and such | |
3350 ensure_parsability(true); | |
3351 } | |
3352 | |
3353 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3354 // FIXME: what is this about? | |
3355 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3356 // is set. | |
3357 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3358 "derived pointer present")); | |
1245
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|
3359 // always_do_update_barrier = true; |
3979
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|
3360 |
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6484982: G1: process references during evacuation pauses
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|
3361 // We have just completed a GC. Update the soft reference |
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6484982: G1: process references during evacuation pauses
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|
3362 // policy with the new heap occupancy |
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|
3363 Universe::update_heap_info_at_gc(); |
342 | 3364 } |
3365 | |
1973 | 3366 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3367 unsigned int gc_count_before, | |
3368 bool* succeeded) { | |
3369 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3370 g1_policy()->record_stop_world_start(); |
1973 | 3371 VM_G1IncCollectionPause op(gc_count_before, |
3372 word_size, | |
3373 false, /* should_initiate_conc_mark */ | |
3374 g1_policy()->max_pause_time_ms(), | |
3375 GCCause::_g1_inc_collection_pause); | |
3376 VMThread::execute(&op); | |
3377 | |
3378 HeapWord* result = op.result(); | |
3379 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3380 assert(result == NULL || ret_succeeded, | |
3381 "the result should be NULL if the VM did not succeed"); | |
3382 *succeeded = ret_succeeded; | |
3383 | |
3384 assert_heap_not_locked(); | |
3385 return result; | |
342 | 3386 } |
3387 | |
3388 void | |
3389 G1CollectedHeap::doConcurrentMark() { | |
845
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3390 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3391 if (!_cmThread->in_progress()) { |
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|
3392 _cmThread->set_started(); |
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|
3393 CGC_lock->notify(); |
342 | 3394 } |
3395 } | |
3396 | |
3397 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3398 bool young) { | |
3399 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3400 } | |
3401 | |
3402 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3403 predicted_time_ms) { | |
3404 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3405 } | |
3406 | |
3407 size_t G1CollectedHeap::pending_card_num() { | |
3408 size_t extra_cards = 0; | |
3409 JavaThread *curr = Threads::first(); | |
3410 while (curr != NULL) { | |
3411 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3412 extra_cards += dcq.size(); | |
3413 curr = curr->next(); | |
3414 } | |
3415 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3416 size_t buffer_size = dcqs.buffer_size(); | |
3417 size_t buffer_num = dcqs.completed_buffers_num(); | |
3418 return buffer_size * buffer_num + extra_cards; | |
3419 } | |
3420 | |
3421 size_t G1CollectedHeap::max_pending_card_num() { | |
3422 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3423 size_t buffer_size = dcqs.buffer_size(); | |
3424 size_t buffer_num = dcqs.completed_buffers_num(); | |
3425 int thread_num = Threads::number_of_threads(); | |
3426 return (buffer_num + thread_num) * buffer_size; | |
3427 } | |
3428 | |
3429 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3430 return g1_rem_set()->cardsScanned(); |
342 | 3431 } |
3432 | |
3433 void | |
3434 G1CollectedHeap::setup_surviving_young_words() { | |
3435 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
4090
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3436 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3437 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
3438 if (_surviving_young_words == NULL) { | |
3439 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3440 "Not enough space for young surv words summary."); | |
3441 } | |
3442 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
845
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|
3443 #ifdef ASSERT |
342 | 3444 for (size_t i = 0; i < array_length; ++i) { |
845
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3445 assert( _surviving_young_words[i] == 0, "memset above" ); |
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|
3446 } |
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|
3447 #endif // !ASSERT |
342 | 3448 } |
3449 | |
3450 void | |
3451 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3452 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
4090
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|
3453 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3454 for (size_t i = 0; i < array_length; ++i) |
3455 _surviving_young_words[i] += surv_young_words[i]; | |
3456 } | |
3457 | |
3458 void | |
3459 G1CollectedHeap::cleanup_surviving_young_words() { | |
3460 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3461 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3462 _surviving_young_words = NULL; | |
3463 } | |
3464 | |
3777
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|
3465 #ifdef ASSERT |
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|
3466 class VerifyCSetClosure: public HeapRegionClosure { |
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|
3467 public: |
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changeset
|
3468 bool doHeapRegion(HeapRegion* hr) { |
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changeset
|
3469 // Here we check that the CSet region's RSet is ready for parallel |
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changeset
|
3470 // iteration. The fields that we'll verify are only manipulated |
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changeset
|
3471 // when the region is part of a CSet and is collected. Afterwards, |
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|
3472 // we reset these fields when we clear the region's RSet (when the |
e8b0b0392037
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changeset
|
3473 // region is freed) so they are ready when the region is |
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changeset
|
3474 // re-allocated. The only exception to this is if there's an |
e8b0b0392037
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diff
changeset
|
3475 // evacuation failure and instead of freeing the region we leave |
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changeset
|
3476 // it in the heap. In that case, we reset these fields during |
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|
3477 // evacuation failure handling. |
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changeset
|
3478 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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|
3479 |
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changeset
|
3480 // Here's a good place to add any other checks we'd like to |
e8b0b0392037
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diff
changeset
|
3481 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
changeset
|
3482 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
changeset
|
3483 } |
0414c1049f15
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diff
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|
3484 }; |
3777
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changeset
|
3485 #endif // ASSERT |
1261
0414c1049f15
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diff
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|
3486 |
1709 | 3487 #if TASKQUEUE_STATS |
3488 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3489 st->print_raw_cr("GC Task Stats"); | |
3490 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3491 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3492 } | |
3493 | |
3494 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3495 print_taskqueue_stats_hdr(st); | |
3496 | |
3497 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3498 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3499 for (int i = 0; i < n; ++i) { |
3500 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3501 totals += task_queue(i)->stats; | |
3502 } | |
3503 st->print_raw("tot "); totals.print(st); st->cr(); | |
3504 | |
3505 DEBUG_ONLY(totals.verify()); | |
3506 } | |
3507 | |
3508 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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1719
diff
changeset
|
3509 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3510 for (int i = 0; i < n; ++i) { |
3511 task_queue(i)->stats.reset(); | |
3512 } | |
3513 } | |
3514 #endif // TASKQUEUE_STATS | |
3515 | |
1973 | 3516 bool |
1656
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6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
3517 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3518 assert_at_safepoint(true /* should_be_vm_thread */); |
3519 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3520 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
3521 if (GC_locker::check_active_before_gc()) { |
1973 | 3522 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3523 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3524 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3525 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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diff
changeset
|
3526 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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diff
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|
3527 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3528 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3529 Universe::print_heap_before_gc(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3530 } |
0316eac49d5a
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|
3531 |
4072 | 3532 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3533 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
3534 verify_dirty_young_regions(); |
2152 | 3535 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3536 { |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3537 // This call will decide whether this pause is an initial-mark |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3538 // pause. If it is, during_initial_mark_pause() will return true |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3539 // for the duration of this pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3540 g1_policy()->decide_on_conc_mark_initiation(); |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3541 |
4710 | 3542 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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diff
changeset
|
3543 assert(!g1_policy()->during_initial_mark_pause() || |
4710 | 3544 g1_policy()->gcs_are_young(), "sanity"); |
3545 | |
3546 // We also do not allow mixed GCs during marking. | |
3547 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); | |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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diff
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|
3548 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3549 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3550 sprintf(verbose_str, "GC pause "); |
4710 | 3551 if (g1_policy()->gcs_are_young()) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3552 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3553 } else { |
4710 | 3554 strcat(verbose_str, "(mixed)"); |
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3555 } |
1656
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changeset
|
3556 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3557 strcat(verbose_str, " (initial-mark)"); |
1656
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6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
3558 // 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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diff
changeset
|
3559 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
3560 increment_total_full_collections(); |
4e5661ba9d98
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|
3561 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3562 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3563 // 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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diff
changeset
|
3564 // 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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diff
changeset
|
3565 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3566 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3567 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3568 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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diff
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|
3569 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3570 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3571 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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parents:
1088
diff
changeset
|
3572 |
2361 | 3573 // If the secondary_free_list is not empty, append it to the |
3574 // free_list. No need to wait for the cleanup operation to finish; | |
3575 // the region allocation code will check the secondary_free_list | |
3576 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3577 // set, skip this step so that the region allocation code has to | |
3578 // get entries from the secondary_free_list. | |
2152 | 3579 if (!G1StressConcRegionFreeing) { |
2361 | 3580 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3581 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3582 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
3583 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
3584 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3585 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3586 // Don't dynamically change the number of GC threads this early. A value of |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3587 // 0 is used to indicate serial work. When parallel work is done, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3588 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3589 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3590 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3591 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3592 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3593 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3594 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
|
3595 increment_gc_time_stamp(); |
342 | 3596 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3597 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3598 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
|
3599 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3600 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3601 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3602 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3603 /* option */ VerifyOption_G1UsePrevMarking); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3604 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3605 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3606 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3607 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3608 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3612 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3613 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3620 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3621 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 // 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
|
3625 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 release_mutator_alloc_region(); |
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 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3637 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3638 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 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
|
3642 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3643 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3646 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3647 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3650 #endif // YOUNG_LIST_VERBOSE |
342 | 3651 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 // We must do this before any possible evacuation that should propagate |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 // marks. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 double start_time_sec = os::elapsedTime(); |
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 _cm->drainAllSATBBuffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 g1_policy()->record_satb_drain_time(finish_mark_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 // 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
|
3667 // only iterate over these. (Since evacuation may add to the mark |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 // stack, doing more exposes race conditions.) If no mark is in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 // progress, this will be zero. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 _cm->set_oops_do_bound(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3671 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3672 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3673 concurrent_mark()->newCSet(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3674 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3675 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3676 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3677 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 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
|
3680 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3681 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 g1_policy()->choose_collection_set(target_pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3697 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3698 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 // We have chosen the complete collection set. If marking is |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3701 // active then, we clear the region fields of any of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 // concurrent marking tasks whose region fields point into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 // the collection set as these values will become stale. This |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 // will cause the owning marking threads to claim a new region |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3705 // when marking restarts. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3706 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3707 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 } |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3709 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3710 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3713 #endif // ASSERT |
1707 | 3714 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3715 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3716 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3717 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3718 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3719 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3720 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3721 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3722 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3723 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3724 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3725 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3726 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3732 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 "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
|
3744 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3745 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3746 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3747 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3748 #endif // YOUNG_LIST_VERBOSE |
342 | 3749 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 _young_list->last_survivor_region()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 set_marking_started(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 // CAUTION: after the doConcurrentMark() call below, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 // the concurrent marking thread(s) could be running |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 // concurrently with us. Make sure that anything after |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3770 // 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
|
3771 // running. Note: of course, the actual marking work will |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 // not start until the safepoint itself is released in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 // ConcurrentGCThread::safepoint_desynchronize(). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 doConcurrentMark(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3775 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3776 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3778 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3779 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 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
|
3783 #endif // YOUNG_LIST_VERBOSE |
342 | 3784 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3785 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3786 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3788 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3789 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 size_t bytes_before = capacity(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3793 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3794 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3795 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3796 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3797 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3798 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3799 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3800 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 g1_policy()->record_pause_time_ms(pause_time_ms); |
4711 | 3803 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
3804 workers()->active_workers() : 1); | |
3805 g1_policy()->record_collection_pause_end(active_workers); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3808 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 // 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
|
3810 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3811 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3812 // 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
|
3813 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3816 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3817 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3820 // 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
|
3821 // 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
|
3822 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3823 // 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
|
3824 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3825 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3826 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3828 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3830 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3831 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 prepare_for_verify(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 Universe::verify(/* allow dirty */ true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3837 /* silent */ false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3838 /* option */ VerifyOption_G1UsePrevMarking); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 // 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
|
3845 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3846 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3847 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3848 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3849 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3850 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
|
3851 // 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
|
3852 // 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
|
3853 if (!expand(expand_bytes)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3854 // 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
|
3855 // committed/uncommitted amount match the backing store |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3856 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3857 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
|
3858 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3859 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3860 } |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3861 |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3862 // 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
|
3863 // 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
|
3864 // 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
|
3865 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3866 _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
|
3867 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3868 // 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
|
3869 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3870 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3871 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3872 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3873 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3874 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3875 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3876 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3877 #endif |
342 | 3878 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3879 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3880 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3881 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3882 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3883 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
|
3884 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3885 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3886 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3887 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3888 |
3766 | 3889 _hrs.verify_optional(); |
2152 | 3890 verify_region_sets_optional(); |
3891 | |
1709 | 3892 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3893 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3894 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3895 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3896 Universe::print_heap_after_gc(); |
342 | 3897 } |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3898 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3899 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3900 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3901 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3902 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3903 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3904 } |
1973 | 3905 |
3906 return true; | |
342 | 3907 } |
3908 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3909 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3910 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3911 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3912 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3913 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3914 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3915 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3916 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3917 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3918 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3919 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3920 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3921 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3922 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3923 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3924 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3925 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3926 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3927 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3928 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3929 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3930 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3931 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3932 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3933 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3934 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3935 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3936 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3937 void G1CollectedHeap::init_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3938 assert_at_safepoint(true /* should_be_vm_thread */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3939 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3940 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3941 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3942 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3943 _retained_old_gc_alloc_region = NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3944 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3945 // We will discard the current GC alloc region if: |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3946 // a) it's in the collection set (it can happen!), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3947 // b) it's already full (no point in using it), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3948 // c) it's empty (this means that it was emptied during |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3949 // a cleanup and it should be on the free list now), or |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3950 // d) it's humongous (this means that it was emptied |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3951 // during a cleanup and was added to the free list, but |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3952 // has been subseqently used to allocate a humongous |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3953 // object that may be less than the region size). |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3954 if (retained_region != NULL && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3955 !retained_region->in_collection_set() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3956 !(retained_region->top() == retained_region->end()) && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3957 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3958 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3959 retained_region->set_saved_mark(); |
4072 | 3960 // The retained region was added to the old region set when it was |
3961 // retired. We have to remove it now, since we don't allow regions | |
3962 // we allocate to in the region sets. We'll re-add it later, when | |
3963 // it's retired again. | |
3964 _old_set.remove(retained_region); | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3965 _old_gc_alloc_region.set(retained_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3966 _hr_printer.reuse(retained_region); |
342 | 3967 } |
3968 } | |
3969 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3970 void G1CollectedHeap::release_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3971 _survivor_gc_alloc_region.release(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3972 // If we have an old GC alloc region to release, we'll save it in |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3973 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3974 // _retained_old_gc_alloc_region will become NULL. This is what we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3975 // want either way so no reason to check explicitly for either |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3976 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3977 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 3978 } |
3979 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3980 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3981 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3982 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
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3983 _retained_old_gc_alloc_region = NULL; |
342 | 3984 } |
3985 | |
3986 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3987 _drain_in_progress = false; | |
3988 set_evac_failure_closure(cl); | |
3989 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3990 } | |
3991 | |
3992 void G1CollectedHeap::finalize_for_evac_failure() { | |
3993 assert(_evac_failure_scan_stack != NULL && | |
3994 _evac_failure_scan_stack->length() == 0, | |
3995 "Postcondition"); | |
3996 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3997 delete _evac_failure_scan_stack; |
342 | 3998 _evac_failure_scan_stack = NULL; |
3999 } | |
4000 | |
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4001 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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4002 private: |
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4003 G1CollectedHeap* _g1; |
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4004 DirtyCardQueue *_dcq; |
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4005 CardTableModRefBS* _ct_bs; |
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4006 |
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4007 public: |
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4008 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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4009 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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4010 |
845
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4011 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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4012 virtual void do_oop( oop* p) { do_oop_work(p); } |
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4013 template <class T> void do_oop_work(T* p) { |
616
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4014 assert(_from->is_in_reserved(p), "paranoia"); |
845
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4015 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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4016 !_from->is_survivor()) { |
616
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4017 size_t card_index = _ct_bs->index_for(p); |
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4018 if (_ct_bs->mark_card_deferred(card_index)) { |
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4019 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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4020 } |
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4021 } |
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4022 } |
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4023 }; |
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4024 |
342 | 4025 class RemoveSelfPointerClosure: public ObjectClosure { |
4026 private: | |
4027 G1CollectedHeap* _g1; | |
4028 ConcurrentMark* _cm; | |
4029 HeapRegion* _hr; | |
4030 size_t _prev_marked_bytes; | |
4031 size_t _next_marked_bytes; | |
616
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4032 OopsInHeapRegionClosure *_cl; |
342 | 4033 public: |
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4034 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
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4035 OopsInHeapRegionClosure* cl) : |
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4036 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
616
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4037 _next_marked_bytes(0), _cl(cl) {} |
342 | 4038 |
4039 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
4040 size_t next_marked_bytes() { return _next_marked_bytes; } | |
4041 | |
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4042 // <original comment> |
352
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4043 // The original idea here was to coalesce evacuated and dead objects. |
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4044 // However that caused complications with the block offset table (BOT). |
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4045 // In particular if there were two TLABs, one of them partially refined. |
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4046 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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4047 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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4048 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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4049 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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4050 // would point into middle of the filler object. |
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4051 // The current approach is to not coalesce and leave the BOT contents intact. |
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4052 // </original comment> |
352
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4053 // |
2133
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4054 // We now reset the BOT when we start the object iteration over the |
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4055 // region and refine its entries for every object we come across. So |
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4056 // the above comment is not really relevant and we should be able |
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4057 // to coalesce dead objects if we want to. |
352
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4058 void do_object(oop obj) { |
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4059 HeapWord* obj_addr = (HeapWord*) obj; |
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4060 assert(_hr->is_in(obj_addr), "sanity"); |
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4061 size_t obj_size = obj->size(); |
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4062 _hr->update_bot_for_object(obj_addr, obj_size); |
352
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4063 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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4064 // The object failed to move. |
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4065 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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4066 _cm->markPrev(obj); |
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4067 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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4068 _prev_marked_bytes += (obj_size * HeapWordSize); |
352
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4069 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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4070 _cm->markAndGrayObjectIfNecessary(obj); |
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4071 } |
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4072 obj->set_mark(markOopDesc::prototype()); |
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4073 // While we were processing RSet buffers during the |
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4074 // collection, we actually didn't scan any cards on the |
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4075 // collection set, since we didn't want to update remebered |
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4076 // sets with entries that point into the collection set, given |
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4077 // that live objects fromthe collection set are about to move |
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4078 // and such entries will be stale very soon. This change also |
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4079 // dealt with a reliability issue which involved scanning a |
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4080 // card in the collection set and coming across an array that |
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4081 // was being chunked and looking malformed. The problem is |
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4082 // that, if evacuation fails, we might have remembered set |
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4083 // entries missing given that we skipped cards on the |
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4084 // collection set. So, we'll recreate such entries now. |
616
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4085 obj->oop_iterate(_cl); |
352
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4086 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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4087 } else { |
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4088 // The object has been either evacuated or is dead. Fill it with a |
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4089 // dummy object. |
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4090 MemRegion mr((HeapWord*)obj, obj_size); |
481
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4091 CollectedHeap::fill_with_object(mr); |
342 | 4092 _cm->clearRangeBothMaps(mr); |
4093 } | |
4094 } | |
4095 }; | |
4096 | |
4097 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 4098 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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4099 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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4100 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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4101 OopsInHeapRegionClosure *cl; |
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4102 if (G1DeferredRSUpdate) { |
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4103 cl = &deferred_update; |
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4104 } else { |
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4105 cl = &immediate_update; |
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4106 } |
342 | 4107 HeapRegion* cur = g1_policy()->collection_set(); |
4108 while (cur != NULL) { | |
4109 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
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4110 assert(!cur->isHumongous(), "sanity"); |
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4111 |
342 | 4112 if (cur->evacuation_failed()) { |
4113 assert(cur->in_collection_set(), "bad CS"); | |
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4114 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
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4115 |
3777
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4116 // In the common case we make sure that this is done when the |
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4117 // region is freed so that it is "ready-to-go" when it's |
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4118 // re-allocated. However, when evacuation failure happens, a |
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4119 // region will remain in the heap and might ultimately be added |
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4120 // to a CSet in the future. So we have to be careful here and |
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4121 // make sure the region's RSet is ready for parallel iteration |
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4122 // whenever this might be required in the future. |
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tonyp
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changeset
|
4123 cur->rem_set()->reset_for_par_iteration(); |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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|
4124 cur->reset_bot(); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
4125 cl->set_region(cur); |
342 | 4126 cur->object_iterate(&rspc); |
4127 | |
4128 // A number of manipulations to make the TAMS be the current top, | |
4129 // and the marked bytes be the ones observed in the iteration. | |
4130 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
4131 // The comments below are the postconditions achieved by the | |
4132 // calls. Note especially the last such condition, which says that | |
4133 // the count of marked bytes has been properly restored. | |
4134 cur->note_start_of_marking(false); | |
4135 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
4136 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
4137 // _next_marked_bytes == prev_marked_bytes. | |
4138 cur->note_end_of_marking(); | |
4139 // _prev_top_at_mark_start == top(), | |
4140 // _prev_marked_bytes == prev_marked_bytes | |
4141 } | |
4142 // If there is no mark in progress, we modified the _next variables | |
4143 // above needlessly, but harmlessly. | |
4144 if (_g1h->mark_in_progress()) { | |
4145 cur->note_start_of_marking(false); | |
4146 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
4147 // _next_marked_bytes == next_marked_bytes. | |
4148 } | |
4149 } | |
4150 cur = cur->next_in_collection_set(); | |
4151 } | |
4152 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
4153 | |
4154 // Now restore saved marks, if any. | |
4155 if (_objs_with_preserved_marks != NULL) { | |
4156 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4157 guarantee(_objs_with_preserved_marks->length() == | |
4158 _preserved_marks_of_objs->length(), "Both or none."); | |
4159 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4160 oop obj = _objs_with_preserved_marks->at(i); | |
4161 markOop m = _preserved_marks_of_objs->at(i); | |
4162 obj->set_mark(m); | |
4163 } | |
4164 // Delete the preserved marks growable arrays (allocated on the C heap). | |
4165 delete _objs_with_preserved_marks; | |
4166 delete _preserved_marks_of_objs; | |
4167 _objs_with_preserved_marks = NULL; | |
4168 _preserved_marks_of_objs = NULL; | |
4169 } | |
4170 } | |
4171 | |
4172 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4173 _evac_failure_scan_stack->push(obj); | |
4174 } | |
4175 | |
4176 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4177 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4178 | |
4179 while (_evac_failure_scan_stack->length() > 0) { | |
4180 oop obj = _evac_failure_scan_stack->pop(); | |
4181 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4182 obj->oop_iterate_backwards(_evac_failure_closure); | |
4183 } | |
4184 } | |
4185 | |
4186 oop | |
4187 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3973
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4188 oop old, |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
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|
4189 bool should_mark_root) { |
3323
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7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
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3317
diff
changeset
|
4190 assert(obj_in_cs(old), |
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|
4191 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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tonyp
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diff
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|
4192 (HeapWord*) old)); |
342 | 4193 markOop m = old->mark(); |
4194 oop forward_ptr = old->forward_to_atomic(old); | |
4195 if (forward_ptr == NULL) { | |
4196 // Forward-to-self succeeded. | |
3973
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4197 |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4198 // should_mark_root will be true when this routine is called |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4199 // from a root scanning closure during an initial mark pause. |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4200 // In this case the thread that succeeds in self-forwarding the |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
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changeset
|
4201 // object is also responsible for marking the object. |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
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|
4202 if (should_mark_root) { |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
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diff
changeset
|
4203 assert(!oopDesc::is_null(old), "shouldn't be"); |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
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|
4204 _cm->grayRoot(old); |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
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|
4205 } |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
changeset
|
4206 |
342 | 4207 if (_evac_failure_closure != cl) { |
4208 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4209 assert(!_drain_in_progress, | |
4210 "Should only be true while someone holds the lock."); | |
4211 // Set the global evac-failure closure to the current thread's. | |
4212 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4213 set_evac_failure_closure(cl); | |
4214 // Now do the common part. | |
4215 handle_evacuation_failure_common(old, m); | |
4216 // Reset to NULL. | |
4217 set_evac_failure_closure(NULL); | |
4218 } else { | |
4219 // The lock is already held, and this is recursive. | |
4220 assert(_drain_in_progress, "This should only be the recursive case."); | |
4221 handle_evacuation_failure_common(old, m); | |
4222 } | |
4223 return old; | |
4224 } else { | |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4225 // Forward-to-self failed. Either someone else managed to allocate |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4226 // space for this object (old != forward_ptr) or they beat us in |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4227 // self-forwarding it (old == forward_ptr). |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4228 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4229 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4230 "should not be in the CSet", |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4231 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4232 return forward_ptr; |
4233 } | |
4234 } | |
4235 | |
4236 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4237 set_evacuation_failed(true); | |
4238 | |
4239 preserve_mark_if_necessary(old, m); | |
4240 | |
4241 HeapRegion* r = heap_region_containing(old); | |
4242 if (!r->evacuation_failed()) { | |
4243 r->set_evacuation_failed(true); | |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4244 _hr_printer.evac_failure(r); |
342 | 4245 } |
4246 | |
4247 push_on_evac_failure_scan_stack(old); | |
4248 | |
4249 if (!_drain_in_progress) { | |
4250 // prevent recursion in copy_to_survivor_space() | |
4251 _drain_in_progress = true; | |
4252 drain_evac_failure_scan_stack(); | |
4253 _drain_in_progress = false; | |
4254 } | |
4255 } | |
4256 | |
4257 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4258 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4259 // We want to call the "for_promotion_failure" version only in the |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4260 // case of a promotion failure. |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4261 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4262 if (_objs_with_preserved_marks == NULL) { |
4263 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4264 _objs_with_preserved_marks = | |
4265 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4266 _preserved_marks_of_objs = | |
4267 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4268 } | |
4269 _objs_with_preserved_marks->push(obj); | |
4270 _preserved_marks_of_objs->push(m); | |
4271 } | |
4272 } | |
4273 | |
4274 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4275 size_t word_size) { | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4276 if (purpose == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4277 HeapWord* result = survivor_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4278 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4279 return result; |
342 | 4280 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4281 // Let's try to allocate in the old gen in case we can fit the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4282 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4283 return old_attempt_allocation(word_size); |
342 | 4284 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4285 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4286 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4287 HeapWord* result = old_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4288 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4289 return result; |
342 | 4290 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4291 // 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
|
4292 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4293 return survivor_attempt_allocation(word_size); |
342 | 4294 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4295 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4296 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4297 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4298 // Trying to keep some compilers happy. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4299 return NULL; |
342 | 4300 } |
4301 | |
4302 #ifndef PRODUCT | |
4303 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4304 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4305 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4306 return true; | |
4307 } | |
4308 #endif // PRODUCT | |
4309 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4310 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4311 ParGCAllocBuffer(gclab_word_size), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4312 _should_mark_objects(false), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4313 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4314 _retired(false) |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4315 { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4316 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4317 // mark the forwarded location of an evacuated object. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4318 // 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:
3869
diff
changeset
|
4319 // 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
|
4320 // need to mark objects immediately reachable by the roots. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4321 if (G1CollectedHeap::heap()->mark_in_progress() || |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4322 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4323 _should_mark_objects = true; |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4324 } |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4325 } |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
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3869
diff
changeset
|
4326 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4327 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4328 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4329 _refs(g1h->task_queue(queue_num)), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4330 _dcq(&g1h->dirty_card_queue_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4331 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4332 _g1_rem(g1h->g1_rem_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4333 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4334 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4335 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4336 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4337 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4338 _strong_roots_time(0), _term_time(0), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4339 _alloc_buffer_waste(0), _undo_waste(0) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4340 { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4341 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4342 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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4343 // non-young regions (where the age is -1) |
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4344 // We also add a few elements at the beginning and at the end in |
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4345 // an attempt to eliminate cache contention |
4090
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7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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4346 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
845
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4347 size_t array_length = PADDING_ELEM_NUM + |
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4348 real_length + |
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4349 PADDING_ELEM_NUM; |
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4350 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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4351 if (_surviving_young_words_base == NULL) |
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4352 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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4353 "Not enough space for young surv histo."); |
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4354 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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4355 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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4356 |
1391
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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4357 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4358 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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4359 |
845
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4360 _start = os::elapsedTime(); |
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4361 } |
342 | 4362 |
1709 | 4363 void |
4364 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4365 { | |
4366 st->print_raw_cr("GC Termination Stats"); | |
4367 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4368 " ------waste (KiB)------"); | |
4369 st->print_raw_cr("thr ms ms % ms % attempts" | |
4370 " total alloc undo"); | |
4371 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4372 " ------- ------- -------"); | |
4373 } | |
4374 | |
4375 void | |
4376 G1ParScanThreadState::print_termination_stats(int i, | |
4377 outputStream* const st) const | |
4378 { | |
4379 const double elapsed_ms = elapsed_time() * 1000.0; | |
4380 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4381 const double term_ms = term_time() * 1000.0; | |
4382 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4383 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4384 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4385 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4386 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4387 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4388 alloc_buffer_waste() * HeapWordSize / K, | |
4389 undo_waste() * HeapWordSize / K); | |
4390 } | |
4391 | |
1862
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4392 #ifdef ASSERT |
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4393 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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4394 assert(ref != NULL, "invariant"); |
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|
4395 assert(UseCompressedOops, "sanity"); |
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4396 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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4397 oop p = oopDesc::load_decode_heap_oop(ref); |
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4398 assert(_g1h->is_in_g1_reserved(p), |
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|
4399 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4400 return true; |
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|
4401 } |
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|
4402 |
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4403 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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6989448: G1: refactor and simplify G1ParScanThreadState
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4404 assert(ref != NULL, "invariant"); |
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|
4405 if (has_partial_array_mask(ref)) { |
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4406 // Must be in the collection set--it's already been copied. |
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|
4407 oop p = clear_partial_array_mask(ref); |
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4408 assert(_g1h->obj_in_cs(p), |
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|
4409 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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|
4410 } else { |
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|
4411 oop p = oopDesc::load_decode_heap_oop(ref); |
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4412 assert(_g1h->is_in_g1_reserved(p), |
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|
4413 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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|
4414 } |
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|
4415 return true; |
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diff
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|
4416 } |
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|
4417 |
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|
4418 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4419 if (ref.is_narrow()) { |
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6989448: G1: refactor and simplify G1ParScanThreadState
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4420 return verify_ref((narrowOop*) ref); |
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|
4421 } else { |
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|
4422 return verify_ref((oop*) ref); |
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|
4423 } |
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diff
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|
4424 } |
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|
4425 #endif // ASSERT |
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|
4426 |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4427 void G1ParScanThreadState::trim_queue() { |
3979
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6484982: G1: process references during evacuation pauses
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|
4428 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4429 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4430 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4431 |
1862
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|
4432 StarTask ref; |
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|
4433 do { |
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|
4434 // Drain the overflow stack first, so other threads can steal. |
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4435 while (refs()->pop_overflow(ref)) { |
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diff
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|
4436 deal_with_reference(ref); |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4437 } |
3979
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6484982: G1: process references during evacuation pauses
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changeset
|
4438 |
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4439 while (refs()->pop_local(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4440 deal_with_reference(ref); |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4441 } |
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diff
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|
4442 } while (!refs()->is_empty()); |
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4443 } |
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|
4444 |
342 | 4445 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4446 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
3886
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|
4447 _par_scan_state(par_scan_state), |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4448 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4449 _mark_in_progress(_g1->mark_in_progress()) { } |
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|
4450 |
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|
4451 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4452 // This is called from do_oop_work for objects that are not |
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|
4453 // in the collection set. Objects in the collection set |
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|
4454 // are marked after they have been evacuated. |
342 | 4455 |
845
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|
4456 T heap_oop = oopDesc::load_heap_oop(p); |
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|
4457 if (!oopDesc::is_null(heap_oop)) { |
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|
4458 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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|
4459 HeapWord* addr = (HeapWord*)obj; |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4460 if (_g1->is_in_g1_reserved(addr)) { |
342 | 4461 _cm->grayRoot(oop(addr)); |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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diff
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|
4462 } |
342 | 4463 } |
4464 } | |
4465 | |
3973
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4466 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
663cb89032b1
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|
4467 bool should_mark_copy) { |
342 | 4468 size_t word_sz = old->size(); |
4469 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4470 // +1 to make the -1 indexes valid... | |
4471 int young_index = from_region->young_index_in_cset()+1; | |
4472 assert( (from_region->is_young() && young_index > 0) || | |
4473 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4474 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4475 markOop m = old->mark(); | |
545 | 4476 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4477 : m->age(); | |
4478 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4479 word_sz); |
4480 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4481 oop obj = oop(obj_ptr); | |
4482 | |
4483 if (obj_ptr == NULL) { | |
4484 // This will either forward-to-self, or detect that someone else has | |
4485 // installed a forwarding pointer. | |
4486 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4487 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
342 | 4488 } |
4489 | |
526 | 4490 // We're going to allocate linearly, so might as well prefetch ahead. |
4491 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4492 | |
342 | 4493 oop forward_ptr = old->forward_to_atomic(obj); |
4494 if (forward_ptr == NULL) { | |
4495 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4496 if (g1p->track_object_age(alloc_purpose)) { |
4497 // We could simply do obj->incr_age(). However, this causes a | |
4498 // performance issue. obj->incr_age() will first check whether | |
4499 // the object has a displaced mark by checking its mark word; | |
4500 // getting the mark word from the new location of the object | |
4501 // stalls. So, given that we already have the mark word and we | |
4502 // are about to install it anyway, it's better to increase the | |
4503 // age on the mark word, when the object does not have a | |
4504 // displaced mark word. We're not expecting many objects to have | |
4505 // a displaced marked word, so that case is not optimized | |
4506 // further (it could be...) and we simply call obj->incr_age(). | |
4507 | |
4508 if (m->has_displaced_mark_helper()) { | |
4509 // in this case, we have to install the mark word first, | |
4510 // otherwise obj looks to be forwarded (the old mark word, | |
4511 // which contains the forward pointer, was copied) | |
4512 obj->set_mark(m); | |
4513 obj->incr_age(); | |
4514 } else { | |
4515 m = m->incr_age(); | |
545 | 4516 obj->set_mark(m); |
526 | 4517 } |
545 | 4518 _par_scan_state->age_table()->add(obj, word_sz); |
4519 } else { | |
4520 obj->set_mark(m); | |
526 | 4521 } |
4522 | |
3886
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|
4523 // Mark the evacuated object or propagate "next" mark bit |
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|
4524 if (should_mark_copy) { |
342 | 4525 if (!use_local_bitmaps || |
4526 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4527 // if we couldn't mark it on the local bitmap (this happens when | |
4528 // the object was not allocated in the GCLab), we have to bite | |
4529 // the bullet and do the standard parallel mark | |
4530 _cm->markAndGrayObjectIfNecessary(obj); | |
4531 } | |
3886
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|
4532 |
342 | 4533 if (_g1->isMarkedNext(old)) { |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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4534 // Unmark the object's old location so that marking |
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4535 // doesn't think the old object is alive. |
342 | 4536 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
4537 } | |
4538 } | |
4539 | |
4540 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4541 surv_young_words[young_index] += word_sz; | |
4542 | |
4543 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4544 arrayOop(old)->set_length(0); | |
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4545 oop* old_p = set_partial_array_mask(old); |
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4546 _par_scan_state->push_on_queue(old_p); |
342 | 4547 } else { |
526 | 4548 // No point in using the slower heap_region_containing() method, |
4549 // given that we know obj is in the heap. | |
4550 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4551 obj->oop_iterate_backwards(_scanner); |
4552 } | |
4553 } else { | |
4554 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4555 obj = forward_ptr; | |
4556 } | |
4557 return obj; | |
4558 } | |
4559 | |
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4560 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
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4561 template <class T> |
3886
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4562 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
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4563 ::do_oop_work(T* p) { |
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4564 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4565 assert(barrier != G1BarrierRS || obj != NULL, |
4566 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4567 | |
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4568 // Marking: |
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4569 // If the object is in the collection set, then the thread |
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4570 // that copies the object should mark, or propagate the |
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|
4571 // mark to, the evacuated object. |
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4572 // If the object is not in the collection set then we |
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4573 // should call the mark_object() method depending on the |
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4574 // value of the template parameter do_mark_object (which will |
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4575 // be true for root scanning closures during an initial mark |
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|
4576 // pause). |
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4577 // The mark_object() method first checks whether the object |
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4578 // is marked and, if not, attempts to mark the object. |
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4579 |
526 | 4580 // here the null check is implicit in the cset_fast_test() test |
1261
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4581 if (_g1->in_cset_fast_test(obj)) { |
526 | 4582 if (obj->is_forwarded()) { |
845
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4583 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
3886
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4584 // If we are a root scanning closure during an initial |
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4585 // mark pause (i.e. do_mark_object will be true) then |
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4586 // we also need to handle marking of roots in the |
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4587 // event of an evacuation failure. In the event of an |
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|
4588 // evacuation failure, the object is forwarded to itself |
3973
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|
4589 // and not copied. For root-scanning closures, the |
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4590 // object would be marked after a successful self-forward |
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4591 // but an object could be pointed to by both a root and non |
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4592 // root location and be self-forwarded by a non-root-scanning |
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4593 // closure. Therefore we also have to attempt to mark the |
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|
4594 // self-forwarded root object here. |
3886
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|
4595 if (do_mark_object && obj->forwardee() == obj) { |
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|
4596 mark_object(p); |
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|
4597 } |
526 | 4598 } else { |
3973
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|
4599 // During an initial mark pause, objects that are pointed to |
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|
4600 // by the roots need to be marked - even in the event of an |
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|
4601 // evacuation failure. We pass the template parameter |
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|
4602 // do_mark_object (which is true for root scanning closures |
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4603 // during an initial mark pause) to copy_to_survivor_space |
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4604 // which will pass it on to the evacuation failure handling |
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4605 // code. The thread that successfully self-forwards a root |
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|
4606 // object to itself is responsible for marking the object. |
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|
4607 bool should_mark_root = do_mark_object; |
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|
4608 |
3886
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|
4609 // We need to mark the copied object if we're a root scanning |
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4610 // closure during an initial mark pause (i.e. do_mark_object |
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4611 // will be true), or the object is already marked and we need |
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|
4612 // to propagate the mark to the evacuated copy. |
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|
4613 bool should_mark_copy = do_mark_object || |
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4614 _during_initial_mark || |
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|
4615 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
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4616 |
3973
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4617 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
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|
4618 should_mark_copy); |
845
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|
4619 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4620 } |
526 | 4621 // When scanning the RS, we only care about objs in CS. |
4622 if (barrier == G1BarrierRS) { | |
616
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4623 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4624 } |
3886
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|
4625 } else { |
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|
4626 // The object is not in collection set. If we're a root scanning |
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|
4627 // closure during an initial mark pause (i.e. do_mark_object will |
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|
4628 // be true) then attempt to mark the object. |
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|
4629 if (do_mark_object) { |
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|
4630 mark_object(p); |
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|
4631 } |
526 | 4632 } |
4633 | |
4634 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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4635 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4636 } |
4637 | |
4638 if (do_gen_barrier && obj != NULL) { | |
4639 par_do_barrier(p); | |
4640 } | |
4641 } | |
4642 | |
1261
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4643 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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4644 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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4645 |
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4646 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4647 assert(has_partial_array_mask(p), "invariant"); |
4648 oop old = clear_partial_array_mask(p); | |
342 | 4649 assert(old->is_objArray(), "must be obj array"); |
4650 assert(old->is_forwarded(), "must be forwarded"); | |
4651 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4652 | |
4653 objArrayOop obj = objArrayOop(old->forwardee()); | |
4654 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4655 // Process ParGCArrayScanChunk elements now | |
4656 // and push the remainder back onto queue | |
4657 int start = arrayOop(old)->length(); | |
4658 int end = obj->length(); | |
4659 int remainder = end - start; | |
4660 assert(start <= end, "just checking"); | |
4661 if (remainder > 2 * ParGCArrayScanChunk) { | |
4662 // Test above combines last partial chunk with a full chunk | |
4663 end = start + ParGCArrayScanChunk; | |
4664 arrayOop(old)->set_length(end); | |
4665 // Push remainder. | |
845
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4666 oop* old_p = set_partial_array_mask(old); |
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4667 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4668 _par_scan_state->push_on_queue(old_p); |
342 | 4669 } else { |
4670 // Restore length so that the heap remains parsable in | |
4671 // case of evacuation failure. | |
4672 arrayOop(old)->set_length(end); | |
4673 } | |
845
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|
4674 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4675 // process our set of indices (include header in first chunk) |
845
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|
4676 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4677 } |
4678 | |
4679 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4680 protected: | |
4681 G1CollectedHeap* _g1h; | |
4682 G1ParScanThreadState* _par_scan_state; | |
4683 RefToScanQueueSet* _queues; | |
4684 ParallelTaskTerminator* _terminator; | |
4685 | |
4686 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4687 RefToScanQueueSet* queues() { return _queues; } | |
4688 ParallelTaskTerminator* terminator() { return _terminator; } | |
4689 | |
4690 public: | |
4691 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4692 G1ParScanThreadState* par_scan_state, | |
4693 RefToScanQueueSet* queues, | |
4694 ParallelTaskTerminator* terminator) | |
4695 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4696 _queues(queues), _terminator(terminator) {} | |
4697 | |
1862
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|
4698 void do_void(); |
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|
4699 |
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4700 private: |
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|
4701 inline bool offer_termination(); |
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|
4702 }; |
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|
4703 |
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|
4704 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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|
4705 G1ParScanThreadState* const pss = par_scan_state(); |
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|
4706 pss->start_term_time(); |
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4707 const bool res = terminator()->offer_termination(); |
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|
4708 pss->end_term_time(); |
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|
4709 return res; |
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|
4710 } |
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|
4711 |
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|
4712 void G1ParEvacuateFollowersClosure::do_void() { |
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|
4713 StarTask stolen_task; |
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|
4714 G1ParScanThreadState* const pss = par_scan_state(); |
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|
4715 pss->trim_queue(); |
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changeset
|
4716 |
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|
4717 do { |
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|
4718 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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|
4719 assert(pss->verify_task(stolen_task), "sanity"); |
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|
4720 if (stolen_task.is_narrow()) { |
1883
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6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
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1862
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|
4721 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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4722 } else { |
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4723 pss->deal_with_reference((oop*) stolen_task); |
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4724 } |
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4725 |
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4726 // We've just processed a reference and we might have made |
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4727 // available new entries on the queues. So we have to make sure |
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4728 // we drain the queues as necessary. |
342 | 4729 pss->trim_queue(); |
4730 } | |
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4731 } while (!offer_termination()); |
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4732 |
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4733 pss->retire_alloc_buffers(); |
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4734 } |
342 | 4735 |
4736 class G1ParTask : public AbstractGangTask { | |
4737 protected: | |
4738 G1CollectedHeap* _g1h; | |
4739 RefToScanQueueSet *_queues; | |
4740 ParallelTaskTerminator _terminator; | |
4728
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4741 uint _n_workers; |
342 | 4742 |
4743 Mutex _stats_lock; | |
4744 Mutex* stats_lock() { return &_stats_lock; } | |
4745 | |
4746 size_t getNCards() { | |
4747 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4748 / G1BlockOffsetSharedArray::N_bytes; | |
4749 } | |
4750 | |
4751 public: | |
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4752 G1ParTask(G1CollectedHeap* g1h, |
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4753 RefToScanQueueSet *task_queues) |
342 | 4754 : AbstractGangTask("G1 collection"), |
4755 _g1h(g1h), | |
4756 _queues(task_queues), | |
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4757 _terminator(0, _queues), |
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4758 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 4759 {} |
4760 | |
4761 RefToScanQueueSet* queues() { return _queues; } | |
4762 | |
4763 RefToScanQueue *work_queue(int i) { | |
4764 return queues()->queue(i); | |
4765 } | |
4766 | |
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4767 ParallelTaskTerminator* terminator() { return &_terminator; } |
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4768 |
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4769 virtual void set_for_termination(int active_workers) { |
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4770 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
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4771 // in the young space (_par_seq_tasks) in the G1 heap |
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4772 // for SequentialSubTasksDone. |
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4773 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
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4774 // both of which need setting by set_n_termination(). |
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4775 _g1h->SharedHeap::set_n_termination(active_workers); |
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4776 _g1h->set_n_termination(active_workers); |
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4777 terminator()->reset_for_reuse(active_workers); |
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4778 _n_workers = active_workers; |
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4779 } |
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|
4780 |
4728
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|
4781 void work(uint worker_id) { |
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4782 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 4783 |
4784 double start_time_ms = os::elapsedTime() * 1000.0; | |
4728
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4785 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 4786 |
342 | 4787 ResourceMark rm; |
4788 HandleMark hm; | |
4789 | |
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4790 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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4791 |
4728
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|
4792 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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4793 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
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4794 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
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4795 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
342 | 4796 |
4797 pss.set_evac_closure(&scan_evac_cl); | |
4798 pss.set_evac_failure_closure(&evac_failure_cl); | |
4799 pss.set_partial_scan_closure(&partial_scan_cl); | |
4800 | |
3979
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4801 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
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4802 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
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4803 |
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4804 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
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4805 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
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4806 |
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4807 OopClosure* scan_root_cl = &only_scan_root_cl; |
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4808 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
342 | 4809 |
1359
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4810 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
3979
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4811 // We also need to mark copied objects. |
342 | 4812 scan_root_cl = &scan_mark_root_cl; |
4813 scan_perm_cl = &scan_mark_perm_cl; | |
4814 } | |
4815 | |
3983
811ec3d0833b
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4816 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
3979
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|
4817 |
342 | 4818 pss.start_strong_roots(); |
4819 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4820 SharedHeap::SO_AllClasses, | |
4821 scan_root_cl, | |
1261
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4822 &push_heap_rs_cl, |
342 | 4823 scan_perm_cl, |
4728
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4824 worker_id); |
342 | 4825 pss.end_strong_roots(); |
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4826 |
342 | 4827 { |
4828 double start = os::elapsedTime(); | |
4829 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4830 evac.do_void(); | |
4831 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4832 double term_ms = pss.term_time()*1000.0; | |
4728
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4833 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
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4834 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
342 | 4835 } |
1282 | 4836 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4837 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4838 | |
4839 // Clean up any par-expanded rem sets. | |
4840 HeapRegionRemSet::par_cleanup(); | |
4841 | |
4842 if (ParallelGCVerbose) { | |
1709 | 4843 MutexLocker x(stats_lock()); |
4728
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|
4844 pss.print_termination_stats(worker_id); |
342 | 4845 } |
4846 | |
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4847 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4848 double end_time_ms = os::elapsedTime() * 1000.0; |
4728
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|
4849 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 4850 } |
4851 }; | |
4852 | |
4853 // *** Common G1 Evacuation Stuff | |
4854 | |
1833
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|
4855 // This method is run in a GC worker. |
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|
4856 |
342 | 4857 void |
4858 G1CollectedHeap:: | |
4859 g1_process_strong_roots(bool collecting_perm_gen, | |
4860 SharedHeap::ScanningOption so, | |
4861 OopClosure* scan_non_heap_roots, | |
4862 OopsInHeapRegionClosure* scan_rs, | |
4863 OopsInGenClosure* scan_perm, | |
4864 int worker_i) { | |
3979
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|
4865 |
342 | 4866 // First scan the strong roots, including the perm gen. |
4867 double ext_roots_start = os::elapsedTime(); | |
4868 double closure_app_time_sec = 0.0; | |
4869 | |
4870 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4871 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4872 buf_scan_perm.set_generation(perm_gen()); | |
4873 | |
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4874 // Walk the code cache w/o buffering, because StarTask cannot handle |
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|
4875 // unaligned oop locations. |
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|
4876 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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|
4877 |
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|
4878 process_strong_roots(false, // no scoping; this is parallel code |
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|
4879 collecting_perm_gen, so, |
342 | 4880 &buf_scan_non_heap_roots, |
989
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|
4881 &eager_scan_code_roots, |
342 | 4882 &buf_scan_perm); |
1394
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|
4883 |
3979
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|
4884 // Now the CM ref_processor roots. |
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|
4885 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
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|
4886 // We need to treat the discovered reference lists of the |
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|
4887 // concurrent mark ref processor as roots and keep entries |
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|
4888 // (which are added by the marking threads) on them live |
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|
4889 // until they can be processed at the end of marking. |
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|
4890 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
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|
4891 } |
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|
4892 |
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|
4893 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4894 buf_scan_non_heap_roots.done(); |
4895 buf_scan_perm.done(); | |
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|
4896 |
342 | 4897 double ext_roots_end = os::elapsedTime(); |
3823
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|
4898 |
342 | 4899 g1_policy()->reset_obj_copy_time(worker_i); |
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|
4900 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
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|
4901 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4902 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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|
4903 |
342 | 4904 double ext_root_time_ms = |
4905 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
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|
4906 |
342 | 4907 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4908 | |
4909 // Scan strong roots in mark stack. | |
4910 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4911 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4912 } | |
4913 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4914 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4915 | |
4916 // Now scan the complement of the collection set. | |
4917 if (scan_rs != NULL) { | |
4918 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4919 } | |
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|
4920 |
342 | 4921 _process_strong_tasks->all_tasks_completed(); |
4922 } | |
4923 | |
4924 void | |
4925 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4926 OopClosure* non_root_closure) { | |
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|
4927 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
148e5441d916
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|
4928 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4929 } |
4930 | |
3979
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|
4931 // Weak Reference Processing support |
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|
4932 |
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|
4933 // An always "is_alive" closure that is used to preserve referents. |
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4934 // If the object is non-null then it's alive. Used in the preservation |
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4935 // of referent objects that are pointed to by reference objects |
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|
4936 // discovered by the CM ref processor. |
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|
4937 class G1AlwaysAliveClosure: public BoolObjectClosure { |
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|
4938 G1CollectedHeap* _g1; |
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|
4939 public: |
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|
4940 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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4941 void do_object(oop p) { assert(false, "Do not call."); } |
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|
4942 bool do_object_b(oop p) { |
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|
4943 if (p != NULL) { |
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|
4944 return true; |
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|
4945 } |
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|
4946 return false; |
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|
4947 } |
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|
4948 }; |
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|
4949 |
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|
4950 bool G1STWIsAliveClosure::do_object_b(oop p) { |
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4951 // An object is reachable if it is outside the collection set, |
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4952 // or is inside and copied. |
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4953 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
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|
4954 } |
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|
4955 |
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4956 // Non Copying Keep Alive closure |
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4957 class G1KeepAliveClosure: public OopClosure { |
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4958 G1CollectedHeap* _g1; |
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4959 public: |
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4960 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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4961 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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|
4962 void do_oop( oop* p) { |
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4963 oop obj = *p; |
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|
4964 |
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|
4965 if (_g1->obj_in_cs(obj)) { |
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4966 assert( obj->is_forwarded(), "invariant" ); |
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4967 *p = obj->forwardee(); |
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|
4968 } |
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|
4969 } |
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|
4970 }; |
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|
4971 |
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4972 // Copying Keep Alive closure - can be called from both |
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|
4973 // serial and parallel code as long as different worker |
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|
4974 // threads utilize different G1ParScanThreadState instances |
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|
4975 // and different queues. |
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|
4976 |
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|
4977 class G1CopyingKeepAliveClosure: public OopClosure { |
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|
4978 G1CollectedHeap* _g1h; |
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|
4979 OopClosure* _copy_non_heap_obj_cl; |
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|
4980 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
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|
4981 G1ParScanThreadState* _par_scan_state; |
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|
4982 |
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|
4983 public: |
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changeset
|
4984 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
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|
4985 OopClosure* non_heap_obj_cl, |
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|
4986 OopsInHeapRegionClosure* perm_obj_cl, |
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|
4987 G1ParScanThreadState* pss): |
4dfb2df418f2
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changeset
|
4988 _g1h(g1h), |
4dfb2df418f2
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diff
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|
4989 _copy_non_heap_obj_cl(non_heap_obj_cl), |
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changeset
|
4990 _copy_perm_obj_cl(perm_obj_cl), |
4dfb2df418f2
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diff
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|
4991 _par_scan_state(pss) |
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diff
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|
4992 {} |
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diff
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|
4993 |
4dfb2df418f2
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changeset
|
4994 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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changeset
|
4995 virtual void do_oop( oop* p) { do_oop_work(p); } |
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|
4996 |
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diff
changeset
|
4997 template <class T> void do_oop_work(T* p) { |
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|
4998 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
4999 |
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|
5000 if (_g1h->obj_in_cs(obj)) { |
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diff
changeset
|
5001 // If the referent object has been forwarded (either copied |
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|
5002 // to a new location or to itself in the event of an |
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|
5003 // evacuation failure) then we need to update the reference |
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diff
changeset
|
5004 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
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diff
changeset
|
5005 // heap, update the RSet for the referent. |
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diff
changeset
|
5006 // |
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diff
changeset
|
5007 // If the referent has not been forwarded then we have to keep |
4dfb2df418f2
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diff
changeset
|
5008 // it alive by policy. Therefore we have copy the referent. |
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diff
changeset
|
5009 // |
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diff
changeset
|
5010 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
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diff
changeset
|
5011 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
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parents:
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diff
changeset
|
5012 // phase of reference processing) the object and it's followers |
4dfb2df418f2
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diff
changeset
|
5013 // will be copied, the reference field set to point to the |
4dfb2df418f2
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changeset
|
5014 // new location, and the RSet updated. Otherwise we need to |
4dfb2df418f2
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diff
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|
5015 // use the the non-heap or perm closures directly to copy |
4dfb2df418f2
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diff
changeset
|
5016 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
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diff
changeset
|
5017 // updating the RSet. |
4dfb2df418f2
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diff
changeset
|
5018 |
4dfb2df418f2
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diff
changeset
|
5019 if (_g1h->is_in_g1_reserved(p)) { |
4dfb2df418f2
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diff
changeset
|
5020 _par_scan_state->push_on_queue(p); |
4dfb2df418f2
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diff
changeset
|
5021 } else { |
4dfb2df418f2
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diff
changeset
|
5022 // The reference field is not in the G1 heap. |
4dfb2df418f2
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diff
changeset
|
5023 if (_g1h->perm_gen()->is_in(p)) { |
4dfb2df418f2
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diff
changeset
|
5024 _copy_perm_obj_cl->do_oop(p); |
4dfb2df418f2
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diff
changeset
|
5025 } else { |
4dfb2df418f2
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diff
changeset
|
5026 _copy_non_heap_obj_cl->do_oop(p); |
4dfb2df418f2
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diff
changeset
|
5027 } |
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diff
changeset
|
5028 } |
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diff
changeset
|
5029 } |
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diff
changeset
|
5030 } |
4dfb2df418f2
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diff
changeset
|
5031 }; |
4dfb2df418f2
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diff
changeset
|
5032 |
4dfb2df418f2
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diff
changeset
|
5033 // Serial drain queue closure. Called as the 'complete_gc' |
4dfb2df418f2
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diff
changeset
|
5034 // closure for each discovered list in some of the |
4dfb2df418f2
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diff
changeset
|
5035 // reference processing phases. |
4dfb2df418f2
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diff
changeset
|
5036 |
4dfb2df418f2
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diff
changeset
|
5037 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
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parents:
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diff
changeset
|
5038 protected: |
4dfb2df418f2
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diff
changeset
|
5039 G1CollectedHeap* _g1h; |
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diff
changeset
|
5040 G1ParScanThreadState* _par_scan_state; |
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changeset
|
5041 |
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diff
changeset
|
5042 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
4dfb2df418f2
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diff
changeset
|
5043 |
4dfb2df418f2
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diff
changeset
|
5044 public: |
4dfb2df418f2
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diff
changeset
|
5045 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
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parents:
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diff
changeset
|
5046 _g1h(g1h), |
4dfb2df418f2
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diff
changeset
|
5047 _par_scan_state(pss) |
4dfb2df418f2
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diff
changeset
|
5048 { } |
4dfb2df418f2
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diff
changeset
|
5049 |
4dfb2df418f2
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diff
changeset
|
5050 void do_void() { |
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diff
changeset
|
5051 G1ParScanThreadState* const pss = par_scan_state(); |
4dfb2df418f2
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parents:
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diff
changeset
|
5052 pss->trim_queue(); |
4dfb2df418f2
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diff
changeset
|
5053 } |
4dfb2df418f2
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diff
changeset
|
5054 }; |
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diff
changeset
|
5055 |
4dfb2df418f2
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diff
changeset
|
5056 // Parallel Reference Processing closures |
4dfb2df418f2
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diff
changeset
|
5057 |
4dfb2df418f2
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diff
changeset
|
5058 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
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diff
changeset
|
5059 // processing during G1 evacuation pauses. |
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diff
changeset
|
5060 |
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diff
changeset
|
5061 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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|
5062 private: |
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|
5063 G1CollectedHeap* _g1h; |
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|
5064 RefToScanQueueSet* _queues; |
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|
5065 FlexibleWorkGang* _workers; |
3979
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|
5066 int _active_workers; |
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|
5067 |
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|
5068 public: |
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|
5069 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
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|
5070 FlexibleWorkGang* workers, |
3979
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|
5071 RefToScanQueueSet *task_queues, |
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|
5072 int n_workers) : |
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changeset
|
5073 _g1h(g1h), |
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changeset
|
5074 _queues(task_queues), |
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changeset
|
5075 _workers(workers), |
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|
5076 _active_workers(n_workers) |
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|
5077 { |
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|
5078 assert(n_workers > 0, "shouldn't call this otherwise"); |
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|
5079 } |
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|
5080 |
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|
5081 // Executes the given task using concurrent marking worker threads. |
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|
5082 virtual void execute(ProcessTask& task); |
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|
5083 virtual void execute(EnqueueTask& task); |
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|
5084 }; |
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|
5085 |
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|
5086 // Gang task for possibly parallel reference processing |
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|
5087 |
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|
5088 class G1STWRefProcTaskProxy: public AbstractGangTask { |
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|
5089 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
5090 ProcessTask& _proc_task; |
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|
5091 G1CollectedHeap* _g1h; |
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|
5092 RefToScanQueueSet *_task_queues; |
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|
5093 ParallelTaskTerminator* _terminator; |
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|
5094 |
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|
5095 public: |
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|
5096 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
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|
5097 G1CollectedHeap* g1h, |
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|
5098 RefToScanQueueSet *task_queues, |
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|
5099 ParallelTaskTerminator* terminator) : |
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changeset
|
5100 AbstractGangTask("Process reference objects in parallel"), |
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|
5101 _proc_task(proc_task), |
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changeset
|
5102 _g1h(g1h), |
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changeset
|
5103 _task_queues(task_queues), |
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|
5104 _terminator(terminator) |
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|
5105 {} |
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|
5106 |
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|
5107 virtual void work(uint worker_id) { |
3979
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|
5108 // The reference processing task executed by a single worker. |
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|
5109 ResourceMark rm; |
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changeset
|
5110 HandleMark hm; |
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|
5111 |
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|
5112 G1STWIsAliveClosure is_alive(_g1h); |
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|
5113 |
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|
5114 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5115 |
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|
5116 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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|
5117 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5118 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
5119 |
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|
5120 pss.set_evac_closure(&scan_evac_cl); |
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|
5121 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5122 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5123 |
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diff
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|
5124 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5125 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5126 |
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diff
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|
5127 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5128 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5129 |
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parents:
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diff
changeset
|
5130 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5131 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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parents:
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diff
changeset
|
5132 |
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parents:
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diff
changeset
|
5133 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5134 // We also need to mark copied objects. |
4dfb2df418f2
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parents:
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diff
changeset
|
5135 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
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diff
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|
5136 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
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parents:
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diff
changeset
|
5137 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5138 |
4dfb2df418f2
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parents:
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diff
changeset
|
5139 // Keep alive closure. |
4dfb2df418f2
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parents:
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diff
changeset
|
5140 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
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parents:
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diff
changeset
|
5141 |
4dfb2df418f2
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parents:
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diff
changeset
|
5142 // Complete GC closure |
4dfb2df418f2
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parents:
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diff
changeset
|
5143 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
4dfb2df418f2
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parents:
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diff
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|
5144 |
4dfb2df418f2
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diff
changeset
|
5145 // Call the reference processing task's work routine. |
4728
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jmasa
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|
5146 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
4dfb2df418f2
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parents:
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|
5147 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5148 // Note we cannot assert that the refs array is empty here as not all |
4dfb2df418f2
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diff
changeset
|
5149 // of the processing tasks (specifically phase2 - pp2_work) execute |
4dfb2df418f2
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diff
changeset
|
5150 // 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
|
5151 // the queue may not be empty. |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5152 } |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5153 }; |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5154 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5155 // Driver routine for parallel reference processing. |
4dfb2df418f2
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parents:
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diff
changeset
|
5156 // Creates an instance of the ref processing gang |
4dfb2df418f2
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parents:
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diff
changeset
|
5157 // task and has the worker threads execute it. |
4dfb2df418f2
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parents:
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diff
changeset
|
5158 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5159 assert(_workers != NULL, "Need parallel worker threads."); |
4dfb2df418f2
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parents:
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diff
changeset
|
5160 |
4dfb2df418f2
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diff
changeset
|
5161 ParallelTaskTerminator terminator(_active_workers, _queues); |
4dfb2df418f2
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|
5162 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
4dfb2df418f2
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diff
changeset
|
5163 |
4dfb2df418f2
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diff
changeset
|
5164 _g1h->set_par_threads(_active_workers); |
4dfb2df418f2
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diff
changeset
|
5165 _workers->run_task(&proc_task_proxy); |
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parents:
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diff
changeset
|
5166 _g1h->set_par_threads(0); |
4dfb2df418f2
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parents:
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diff
changeset
|
5167 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5168 |
4dfb2df418f2
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parents:
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diff
changeset
|
5169 // Gang task for parallel reference enqueueing. |
4dfb2df418f2
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parents:
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diff
changeset
|
5170 |
4dfb2df418f2
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diff
changeset
|
5171 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
4dfb2df418f2
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|
5172 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
4dfb2df418f2
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diff
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|
5173 EnqueueTask& _enq_task; |
4dfb2df418f2
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diff
changeset
|
5174 |
4dfb2df418f2
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diff
changeset
|
5175 public: |
4dfb2df418f2
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diff
changeset
|
5176 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
4dfb2df418f2
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parents:
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diff
changeset
|
5177 AbstractGangTask("Enqueue reference objects in parallel"), |
4dfb2df418f2
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parents:
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diff
changeset
|
5178 _enq_task(enq_task) |
4dfb2df418f2
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diff
changeset
|
5179 { } |
4dfb2df418f2
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diff
changeset
|
5180 |
4728
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diff
changeset
|
5181 virtual void work(uint worker_id) { |
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changeset
|
5182 _enq_task.work(worker_id); |
3979
4dfb2df418f2
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diff
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|
5183 } |
4dfb2df418f2
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diff
changeset
|
5184 }; |
4dfb2df418f2
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diff
changeset
|
5185 |
4dfb2df418f2
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parents:
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diff
changeset
|
5186 // Driver routine for parallel reference enqueing. |
4dfb2df418f2
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diff
changeset
|
5187 // Creates an instance of the ref enqueueing gang |
4dfb2df418f2
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parents:
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diff
changeset
|
5188 // task and has the worker threads execute it. |
4dfb2df418f2
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parents:
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diff
changeset
|
5189 |
4dfb2df418f2
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parents:
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diff
changeset
|
5190 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5191 assert(_workers != NULL, "Need parallel worker threads."); |
4dfb2df418f2
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parents:
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diff
changeset
|
5192 |
4dfb2df418f2
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changeset
|
5193 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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|
5194 |
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|
5195 _g1h->set_par_threads(_active_workers); |
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|
5196 _workers->run_task(&enq_task_proxy); |
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|
5197 _g1h->set_par_threads(0); |
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|
5198 } |
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changeset
|
5199 |
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diff
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|
5200 // End of weak reference support closures |
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|
5201 |
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|
5202 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5203 // that are in the collection set and are pointed to by reference |
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|
5204 // objects discovered by the CM ref processor. |
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changeset
|
5205 |
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|
5206 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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|
5207 protected: |
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|
5208 G1CollectedHeap* _g1h; |
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|
5209 RefToScanQueueSet *_queues; |
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|
5210 ParallelTaskTerminator _terminator; |
4728
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|
5211 uint _n_workers; |
3979
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|
5212 |
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|
5213 public: |
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|
5214 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
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|
5215 AbstractGangTask("ParPreserveCMReferents"), |
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|
5216 _g1h(g1h), |
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|
5217 _queues(task_queues), |
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|
5218 _terminator(workers, _queues), |
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|
5219 _n_workers(workers) |
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|
5220 { } |
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|
5221 |
4728
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|
5222 void work(uint worker_id) { |
3979
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|
5223 ResourceMark rm; |
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|
5224 HandleMark hm; |
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|
5225 |
4728
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|
5226 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5227 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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|
5228 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5229 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
5230 |
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|
5231 pss.set_evac_closure(&scan_evac_cl); |
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|
5232 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5233 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5234 |
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|
5235 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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|
5236 |
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diff
changeset
|
5237 |
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|
5238 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5239 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5240 |
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|
5241 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5242 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
5243 |
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|
5244 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5245 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5246 |
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diff
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|
5247 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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diff
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|
5248 // We also need to mark copied objects. |
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diff
changeset
|
5249 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5250 copy_perm_cl = ©_mark_perm_cl; |
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|
5251 } |
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diff
changeset
|
5252 |
4dfb2df418f2
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diff
changeset
|
5253 // Is alive closure |
4dfb2df418f2
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diff
changeset
|
5254 G1AlwaysAliveClosure always_alive(_g1h); |
4dfb2df418f2
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diff
changeset
|
5255 |
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diff
changeset
|
5256 // Copying keep alive closure. Applied to referent objects that need |
4dfb2df418f2
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diff
changeset
|
5257 // to be copied. |
4dfb2df418f2
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diff
changeset
|
5258 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
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diff
changeset
|
5259 |
4dfb2df418f2
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diff
changeset
|
5260 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
4dfb2df418f2
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|
5261 |
4728
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diff
changeset
|
5262 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
441e946dc1af
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jmasa
parents:
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diff
changeset
|
5263 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
4dfb2df418f2
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diff
changeset
|
5264 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5265 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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diff
changeset
|
5266 // So this must be true - but assert just in case someone decides to |
4dfb2df418f2
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parents:
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diff
changeset
|
5267 // change the worker ids. |
4728
441e946dc1af
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jmasa
parents:
4711
diff
changeset
|
5268 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
4dfb2df418f2
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diff
changeset
|
5269 assert(!rp->discovery_is_atomic(), "check this code"); |
4dfb2df418f2
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parents:
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diff
changeset
|
5270 |
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diff
changeset
|
5271 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
441e946dc1af
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jmasa
parents:
4711
diff
changeset
|
5272 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5273 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
4dfb2df418f2
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diff
changeset
|
5274 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5275 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
4dfb2df418f2
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diff
changeset
|
5276 while (iter.has_next()) { |
4dfb2df418f2
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diff
changeset
|
5277 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
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diff
changeset
|
5278 // can see some null referent objects. |
4dfb2df418f2
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diff
changeset
|
5279 iter.load_ptrs(DEBUG_ONLY(true)); |
4dfb2df418f2
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diff
changeset
|
5280 oop ref = iter.obj(); |
4dfb2df418f2
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diff
changeset
|
5281 |
4dfb2df418f2
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parents:
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diff
changeset
|
5282 // This will filter nulls. |
4dfb2df418f2
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diff
changeset
|
5283 if (iter.is_referent_alive()) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5284 iter.make_referent_alive(); |
4dfb2df418f2
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parents:
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diff
changeset
|
5285 } |
4dfb2df418f2
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diff
changeset
|
5286 iter.move_to_next(); |
4dfb2df418f2
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diff
changeset
|
5287 } |
4dfb2df418f2
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diff
changeset
|
5288 } |
4dfb2df418f2
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diff
changeset
|
5289 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5290 // Drain the queue - which may cause stealing |
4dfb2df418f2
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diff
changeset
|
5291 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
4dfb2df418f2
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diff
changeset
|
5292 drain_queue.do_void(); |
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diff
changeset
|
5293 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
4dfb2df418f2
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diff
changeset
|
5294 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
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diff
changeset
|
5295 } |
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diff
changeset
|
5296 }; |
4dfb2df418f2
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diff
changeset
|
5297 |
4dfb2df418f2
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diff
changeset
|
5298 // Weak Reference processing during an evacuation pause (part 1). |
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diff
changeset
|
5299 void G1CollectedHeap::process_discovered_references() { |
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diff
changeset
|
5300 double ref_proc_start = os::elapsedTime(); |
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diff
changeset
|
5301 |
4dfb2df418f2
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diff
changeset
|
5302 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
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diff
changeset
|
5303 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
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diff
changeset
|
5304 |
4dfb2df418f2
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diff
changeset
|
5305 // Any reference objects, in the collection set, that were 'discovered' |
4dfb2df418f2
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diff
changeset
|
5306 // by the CM ref processor should have already been copied (either by |
4dfb2df418f2
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diff
changeset
|
5307 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
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diff
changeset
|
5308 // by following an RSet entry). |
4dfb2df418f2
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diff
changeset
|
5309 // |
4dfb2df418f2
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diff
changeset
|
5310 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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diff
changeset
|
5311 // reference objects point to may not have been copied: the STW ref |
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diff
changeset
|
5312 // processor would have seen that the reference object had already |
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diff
changeset
|
5313 // been 'discovered' and would have skipped discovering the reference, |
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diff
changeset
|
5314 // but would not have treated the reference object as a regular oop. |
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diff
changeset
|
5315 // As a reult the copy closure would not have been applied to the |
4dfb2df418f2
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diff
changeset
|
5316 // referent object. |
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diff
changeset
|
5317 // |
4dfb2df418f2
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diff
changeset
|
5318 // We need to explicitly copy these referent objects - the references |
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diff
changeset
|
5319 // will be processed at the end of remarking. |
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diff
changeset
|
5320 // |
4dfb2df418f2
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diff
changeset
|
5321 // We also need to do this copying before we process the reference |
4dfb2df418f2
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diff
changeset
|
5322 // objects discovered by the STW ref processor in case one of these |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5323 // referents points to another object which is also referenced by an |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5324 // object discovered by the STW ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5325 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5326 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5327 workers()->active_workers() : 1); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5328 |
4711 | 5329 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
5330 active_workers == workers()->active_workers(), | |
5331 "Need to reset active_workers"); | |
5332 | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5333 set_par_threads(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5334 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5335 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5336 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5337 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5338 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5339 keep_cm_referents.work(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5341 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5342 set_par_threads(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5343 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5344 // Closure to test whether a referent is alive. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5345 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5346 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5347 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 // of JNI refs is serial and performed serially by the current thread |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5349 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5350 // JNI refs. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5351 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5352 // Use only a single queue for this PSS. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5353 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5354 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5355 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5356 // closures while we're actually processing the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5357 // reference objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5358 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5359 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5361 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5364 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5365 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5366 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5367 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5368 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5369 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5373 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5374 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5377 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5378 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5379 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5380 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5381 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5382 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5383 // Keep alive closure. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5384 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5385 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5386 // Serial Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5387 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5388 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5389 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5390 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5391 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5392 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5393 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5394 rp->process_discovered_references(&is_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5395 &keep_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5396 &drain_queue, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5397 NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5398 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5399 // Parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5400 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5401 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5402 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5403 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5404 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5405 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5406 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5407 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5408 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5409 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5410 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5411 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5412 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5413 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5414 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5415 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5416 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5417 // Weak Reference processing during an evacuation pause (part 2). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5418 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5419 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5420 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5421 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5422 assert(!rp->discovery_enabled(), "should have been disabled as part of processing"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5423 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5424 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5425 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5426 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5427 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5428 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5429 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5430 // Parallel reference enqueuing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5431 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5432 uint active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5433 assert(active_workers == workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5434 "Need to reset active_workers"); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5435 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5436 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5437 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5438 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5439 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5440 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5441 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5442 rp->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5443 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5444 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5445 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5446 // CM's reference processing also cleans up the string and symbol tables. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5447 // Should we do that here also? We could, but it is a serial operation |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5448 // and could signicantly increase the pause time. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5449 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5450 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5451 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5452 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5453 |
342 | 5454 void G1CollectedHeap::evacuate_collection_set() { |
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5455 _expand_heap_after_alloc_failure = true; |
342 | 5456 set_evacuation_failed(false); |
5457 | |
5458 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5459 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5460 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5461 | |
4728
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|
5462 uint n_workers; |
4095
bca17e38de00
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diff
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|
5463 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
5464 n_workers = |
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5465 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
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diff
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|
5466 workers()->active_workers(), |
bca17e38de00
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jmasa
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diff
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|
5467 Threads::number_of_non_daemon_threads()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5468 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
5469 n_workers == workers()->total_workers(), |
bca17e38de00
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jmasa
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diff
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|
5470 "If not dynamic should be using all the workers"); |
4711 | 5471 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5472 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
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|
5473 } else { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5474 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5475 "Should be the original non-parallel value"); |
bca17e38de00
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jmasa
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|
5476 n_workers = 1; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
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|
5477 } |
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|
5478 |
bca17e38de00
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diff
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|
5479 G1ParTask g1_par_task(this, _task_queues); |
342 | 5480 |
5481 init_for_evac_failure(NULL); | |
5482 | |
5483 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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|
5484 |
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diff
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|
5485 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 5486 double start_par = os::elapsedTime(); |
3979
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|
5487 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
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|
5488 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 5489 // The individual threads will set their evac-failure closures. |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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diff
changeset
|
5490 StrongRootsScope srs(this); |
1709 | 5491 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
4095
bca17e38de00
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|
5492 // These tasks use ShareHeap::_process_strong_tasks |
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|
5493 assert(UseDynamicNumberOfGCThreads || |
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|
5494 workers()->active_workers() == workers()->total_workers(), |
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diff
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|
5495 "If not dynamic should be using all the workers"); |
342 | 5496 workers()->run_task(&g1_par_task); |
5497 } else { | |
989
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6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5498 StrongRootsScope srs(this); |
4711 | 5499 g1_par_task.set_for_termination(n_workers); |
342 | 5500 g1_par_task.work(0); |
5501 } | |
5502 | |
5503 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
5504 g1_policy()->record_par_time(par_time); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
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|
5505 |
342 | 5506 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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1973
diff
changeset
|
5507 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5508 // Process any discovered reference objects - we have |
4dfb2df418f2
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diff
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|
5509 // to do this _before_ we retire the GC alloc regions |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5510 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
changeset
|
5511 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5512 // not copied during the pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5513 process_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5514 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5515 // Weak root processing. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5516 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
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diff
changeset
|
5517 // non-perm oops then we will need to process the code blobs |
fd1d227ef1b9
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parents:
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diff
changeset
|
5518 // here too. |
342 | 5519 { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5520 G1STWIsAliveClosure is_alive(this); |
342 | 5521 G1KeepAliveClosure keep_alive(this); |
5522 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5523 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
5524 |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
5525 release_gc_alloc_regions(); |
342 | 5526 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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diff
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|
5527 |
889 | 5528 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5529 concurrent_g1_refine()->set_use_cache(true); |
5530 | |
5531 finalize_for_evac_failure(); | |
5532 | |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5533 // Must do this before clearing the per-region evac-failure flags |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
5534 // (which is currently done when we free the collection set). |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5535 // We also only do this if marking is actually in progress and so |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5536 // have to do this before we set the mark_in_progress flag at the |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5537 // end of an initial mark pause. |
342 | 5538 concurrent_mark()->complete_marking_in_collection_set(); |
5539 | |
5540 if (evacuation_failed()) { | |
5541 remove_self_forwarding_pointers(); | |
5542 if (PrintGCDetails) { | |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5543 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5544 } else if (PrintGC) { |
5545 gclog_or_tty->print("--"); | |
5546 } | |
5547 } | |
5548 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5549 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5550 // reference processor's discovered lists. We need to do |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5551 // this after the card table is cleaned (and verified) as |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
5552 // the act of enqueuing entries on to the pending list |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5553 // will log these updates (and dirty their associated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5554 // cards). We need these updates logged to update any |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5555 // RSets. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5556 enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
5557 |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
5558 if (G1DeferredRSUpdate) { |
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diff
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|
5559 RedirtyLoggedCardTableEntryFastClosure redirty; |
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diff
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|
5560 dirty_card_queue_set().set_closure(&redirty); |
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595
diff
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|
5561 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5562 |
5563 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5564 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
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diff
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|
5565 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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diff
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|
5566 } |
342 | 5567 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5568 } | |
5569 | |
2173 | 5570 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5571 size_t* pre_used, |
5572 FreeRegionList* free_list, | |
4072 | 5573 OldRegionSet* old_proxy_set, |
2152 | 5574 HumongousRegionSet* humongous_proxy_set, |
2173 | 5575 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5576 bool par) { |
5577 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5578 if (hr->isHumongous()) { | |
5579 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5580 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5581 } else { | |
4072 | 5582 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5583 free_region(hr, pre_used, free_list, par); |
342 | 5584 } |
2173 | 5585 } else { |
5586 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5587 } |
5588 } | |
5589 | |
2152 | 5590 void G1CollectedHeap::free_region(HeapRegion* hr, |
5591 size_t* pre_used, | |
5592 FreeRegionList* free_list, | |
5593 bool par) { | |
5594 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5595 assert(!hr->is_empty(), "the region should not be empty"); | |
5596 assert(free_list != NULL, "pre-condition"); | |
5597 | |
5598 *pre_used += hr->used(); | |
5599 hr->hr_clear(par, true /* clear_space */); | |
2432
455328d90876
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2369
diff
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|
5600 free_list->add_as_head(hr); |
2152 | 5601 } |
5602 | |
5603 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5604 size_t* pre_used, | |
5605 FreeRegionList* free_list, | |
5606 HumongousRegionSet* humongous_proxy_set, | |
5607 bool par) { | |
5608 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5609 assert(free_list != NULL, "pre-condition"); | |
5610 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5611 | |
5612 size_t hr_used = hr->used(); | |
5613 size_t hr_capacity = hr->capacity(); | |
5614 size_t hr_pre_used = 0; | |
5615 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5616 hr->set_notHumongous(); | |
5617 free_region(hr, &hr_pre_used, free_list, par); | |
5618 | |
3766 | 5619 size_t i = hr->hrs_index() + 1; |
2152 | 5620 size_t num = 1; |
3766 | 5621 while (i < n_regions()) { |
5622 HeapRegion* curr_hr = region_at(i); | |
2152 | 5623 if (!curr_hr->continuesHumongous()) { |
5624 break; | |
5625 } | |
5626 curr_hr->set_notHumongous(); | |
5627 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5628 num += 1; | |
5629 i += 1; | |
5630 } | |
5631 assert(hr_pre_used == hr_used, | |
5632 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5633 "should be the same", hr_pre_used, hr_used)); | |
5634 *pre_used += hr_pre_used; | |
5635 } | |
5636 | |
5637 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5638 FreeRegionList* free_list, | |
4072 | 5639 OldRegionSet* old_proxy_set, |
2152 | 5640 HumongousRegionSet* humongous_proxy_set, |
5641 bool par) { | |
5642 if (pre_used > 0) { | |
5643 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5644 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5645 assert(_summary_bytes_used >= pre_used, |
5646 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5647 "should be >= pre_used: "SIZE_FORMAT, | |
5648 _summary_bytes_used, pre_used)); | |
342 | 5649 _summary_bytes_used -= pre_used; |
2152 | 5650 } |
5651 if (free_list != NULL && !free_list->is_empty()) { | |
5652 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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|
5653 _free_list.add_as_head(free_list); |
2152 | 5654 } |
4072 | 5655 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5656 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5657 _old_set.update_from_proxy(old_proxy_set); | |
5658 } | |
2152 | 5659 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5660 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5661 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5662 } |
5663 } | |
5664 | |
796
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|
5665 class G1ParCleanupCTTask : public AbstractGangTask { |
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6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
5666 CardTableModRefBS* _ct_bs; |
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diff
changeset
|
5667 G1CollectedHeap* _g1h; |
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diff
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|
5668 HeapRegion* volatile _su_head; |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5669 public: |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5670 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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tonyp
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3824
diff
changeset
|
5671 G1CollectedHeap* g1h) : |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5672 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
f44782f04dd4
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tonyp
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3824
diff
changeset
|
5673 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
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|
5674 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5675 void work(uint worker_id) { |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5676 HeapRegion* r; |
29e7d79232b9
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apetrusenko
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794
diff
changeset
|
5677 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5678 clear_cards(r); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5679 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5680 } |
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diff
changeset
|
5681 |
796
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6819065: G1: eliminate high serial card table clearing time
apetrusenko
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|
5682 void clear_cards(HeapRegion* r) { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
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|
5683 // Cards of the survivors should have already been dirtied. |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5684 if (!r->is_survivor()) { |
796
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|
5685 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
5686 } |
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6819065: G1: eliminate high serial card table clearing time
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diff
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|
5687 } |
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6819065: G1: eliminate high serial card table clearing time
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|
5688 }; |
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6819065: G1: eliminate high serial card table clearing time
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diff
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|
5689 |
940
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6841313: G1: dirty cards of survivor regions in parallel
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|
5690 #ifndef PRODUCT |
8624da129f0b
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|
5691 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5692 G1CollectedHeap* _g1h; |
940
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6841313: G1: dirty cards of survivor regions in parallel
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|
5693 CardTableModRefBS* _ct_bs; |
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6841313: G1: dirty cards of survivor regions in parallel
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|
5694 public: |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5695 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5696 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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|
5697 virtual bool doHeapRegion(HeapRegion* r) { |
1394
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|
5698 if (r->is_survivor()) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5699 _g1h->verify_dirty_region(r); |
940
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|
5700 } else { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5701 _g1h->verify_not_dirty_region(r); |
940
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|
5702 } |
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|
5703 return false; |
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6841313: G1: dirty cards of survivor regions in parallel
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|
5704 } |
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|
5705 }; |
2433
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|
5706 |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5707 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5708 // All of the region should be clean. |
063382f9b575
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|
5709 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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|
5710 MemRegion mr(hr->bottom(), hr->end()); |
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7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5711 ct_bs->verify_not_dirty_region(mr); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5712 } |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5713 |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5714 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5715 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5716 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
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|
5717 // retires each region and replaces it with a new one will do a |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5718 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5719 // not dirty that area (one less thing to have to do while holding |
063382f9b575
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|
5720 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
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|
5721 // is dirty. |
063382f9b575
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|
5722 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5723 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5724 ct_bs->verify_dirty_region(mr); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5725 } |
063382f9b575
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|
5726 |
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5727 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
063382f9b575
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|
5728 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
2433
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|
5729 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5730 verify_dirty_region(hr); |
2433
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|
5731 } |
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diff
changeset
|
5732 } |
abdfc822206f
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diff
changeset
|
5733 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
5734 void G1CollectedHeap::verify_dirty_young_regions() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
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|
5735 verify_dirty_young_list(_young_list->first_region()); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
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|
5736 verify_dirty_young_list(_young_list->first_survivor_region()); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
5737 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5738 #endif |
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diff
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|
5739 |
342 | 5740 void G1CollectedHeap::cleanUpCardTable() { |
5741 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5742 double start = os::elapsedTime(); | |
5743 | |
4023 | 5744 { |
5745 // Iterate over the dirty cards region list. | |
5746 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
5747 | |
4711 | 5748 if (G1CollectedHeap::use_parallel_gc_threads()) { |
5749 set_par_threads(); | |
4023 | 5750 workers()->run_task(&cleanup_task); |
5751 set_par_threads(0); | |
5752 } else { | |
5753 while (_dirty_cards_region_list) { | |
5754 HeapRegion* r = _dirty_cards_region_list; | |
5755 cleanup_task.clear_cards(r); | |
5756 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
5757 if (_dirty_cards_region_list == r) { | |
5758 // The last region. | |
5759 _dirty_cards_region_list = NULL; | |
5760 } | |
5761 r->set_next_dirty_cards_region(NULL); | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
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|
5762 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5763 } |
4023 | 5764 #ifndef PRODUCT |
5765 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
5766 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
5767 heap_region_iterate(&cleanup_verifier); | |
5768 } | |
5769 #endif | |
940
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apetrusenko
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diff
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|
5770 } |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5771 |
342 | 5772 double elapsed = os::elapsedTime() - start; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5773 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
342 | 5774 } |
5775 | |
5776 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5777 size_t pre_used = 0; |
5778 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5779 | |
342 | 5780 double young_time_ms = 0.0; |
5781 double non_young_time_ms = 0.0; | |
5782 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5783 // Since the collection set is a superset of the the young list, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
5784 // all we need to do to clear the young list is clear its |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
5785 // head and length, and unlink any young regions in the code below |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5786 _young_list->clear(); |
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changeset
|
5787 |
342 | 5788 G1CollectorPolicy* policy = g1_policy(); |
5789 | |
5790 double start_sec = os::elapsedTime(); | |
5791 bool non_young = true; | |
5792 | |
5793 HeapRegion* cur = cs_head; | |
5794 int age_bound = -1; | |
5795 size_t rs_lengths = 0; | |
5796 | |
5797 while (cur != NULL) { | |
2361 | 5798 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 5799 if (non_young) { |
5800 if (cur->is_young()) { | |
5801 double end_sec = os::elapsedTime(); | |
5802 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5803 non_young_time_ms += elapsed_ms; | |
5804 | |
5805 start_sec = os::elapsedTime(); | |
5806 non_young = false; | |
5807 } | |
5808 } else { | |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5809 if (!cur->is_young()) { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5810 double end_sec = os::elapsedTime(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5811 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5812 young_time_ms += elapsed_ms; |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5813 |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
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|
5814 start_sec = os::elapsedTime(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
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|
5815 non_young = true; |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
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|
5816 } |
342 | 5817 } |
5818 | |
5819 rs_lengths += cur->rem_set()->occupied(); | |
5820 | |
5821 HeapRegion* next = cur->next_in_collection_set(); | |
5822 assert(cur->in_collection_set(), "bad CS"); | |
5823 cur->set_next_in_collection_set(NULL); | |
5824 cur->set_in_collection_set(false); | |
5825 | |
5826 if (cur->is_young()) { | |
5827 int index = cur->young_index_in_cset(); | |
4090
a88de71c4e3a
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|
5828 assert(index != -1, "invariant"); |
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|
5829 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
342 | 5830 size_t words_survived = _surviving_young_words[index]; |
5831 cur->record_surv_words_in_group(words_survived); | |
1394
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|
5832 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5833 // At this point the we have 'popped' cur from the collection set |
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|
5834 // (linked via next_in_collection_set()) but it is still in the |
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diff
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|
5835 // young list (linked via next_young_region()). Clear the |
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|
5836 // _next_young_region field. |
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|
5837 cur->set_next_young_region(NULL); |
342 | 5838 } else { |
5839 int index = cur->young_index_in_cset(); | |
4090
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|
5840 assert(index == -1, "invariant"); |
342 | 5841 } |
5842 | |
5843 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5844 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5845 "invariant" ); | |
5846 | |
5847 if (!cur->evacuation_failed()) { | |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
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|
5848 MemRegion used_mr = cur->used_region(); |
dc467e8b2c5e
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diff
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|
5849 |
342 | 5850 // And the region is empty. |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
5851 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
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|
5852 |
dc467e8b2c5e
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diff
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|
5853 // If marking is in progress then clear any objects marked in |
dc467e8b2c5e
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changeset
|
5854 // the current region. Note mark_in_progress() returns false, |
dc467e8b2c5e
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diff
changeset
|
5855 // even during an initial mark pause, until the set_marking_started() |
dc467e8b2c5e
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diff
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|
5856 // call which takes place later in the pause. |
dc467e8b2c5e
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diff
changeset
|
5857 if (mark_in_progress()) { |
dc467e8b2c5e
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4095
diff
changeset
|
5858 assert(!g1_policy()->during_initial_mark_pause(), "sanity"); |
dc467e8b2c5e
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4095
diff
changeset
|
5859 _cm->nextMarkBitMap()->clearRange(used_mr); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
5860 } |
dc467e8b2c5e
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4095
diff
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|
5861 |
2152 | 5862 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 5863 } else { |
5864 cur->uninstall_surv_rate_group(); | |
4090
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5865 if (cur->is_young()) { |
342 | 5866 cur->set_young_index_in_cset(-1); |
4090
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|
5867 } |
342 | 5868 cur->set_not_young(); |
5869 cur->set_evacuation_failed(false); | |
4072 | 5870 // The region is now considered to be old. |
5871 _old_set.add(cur); | |
342 | 5872 } |
5873 cur = next; | |
5874 } | |
5875 | |
5876 policy->record_max_rs_lengths(rs_lengths); | |
5877 policy->cset_regions_freed(); | |
5878 | |
5879 double end_sec = os::elapsedTime(); | |
5880 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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|
5881 |
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|
5882 if (non_young) { |
342 | 5883 non_young_time_ms += elapsed_ms; |
4097
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|
5884 } else { |
342 | 5885 young_time_ms += elapsed_ms; |
4097
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|
5886 } |
342 | 5887 |
2152 | 5888 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 5889 NULL /* old_proxy_set */, |
2152 | 5890 NULL /* humongous_proxy_set */, |
5891 false /* par */); | |
342 | 5892 policy->record_young_free_cset_time_ms(young_time_ms); |
5893 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5894 } | |
5895 | |
1394
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|
5896 // This routine is similar to the above but does not record |
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|
5897 // any policy statistics or update free lists; we are abandoning |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5898 // the current incremental collection set in preparation of a |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5899 // full collection. After the full GC we will start to build up |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5900 // the incremental collection set again. |
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|
5901 // This is only called when we're doing a full collection |
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|
5902 // and is immediately followed by the tearing down of the young list. |
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|
5903 |
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|
5904 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5905 HeapRegion* cur = cs_head; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5906 |
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|
5907 while (cur != NULL) { |
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|
5908 HeapRegion* next = cur->next_in_collection_set(); |
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|
5909 assert(cur->in_collection_set(), "bad CS"); |
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|
5910 cur->set_next_in_collection_set(NULL); |
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5911 cur->set_in_collection_set(false); |
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|
5912 cur->set_young_index_in_cset(-1); |
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|
5913 cur = next; |
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|
5914 } |
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|
5915 } |
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|
5916 |
2152 | 5917 void G1CollectedHeap::set_free_regions_coming() { |
5918 if (G1ConcRegionFreeingVerbose) { | |
5919 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5920 "setting free regions coming"); | |
5921 } | |
5922 | |
5923 assert(!free_regions_coming(), "pre-condition"); | |
5924 _free_regions_coming = true; | |
342 | 5925 } |
5926 | |
2152 | 5927 void G1CollectedHeap::reset_free_regions_coming() { |
5928 { | |
5929 assert(free_regions_coming(), "pre-condition"); | |
5930 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5931 _free_regions_coming = false; | |
5932 SecondaryFreeList_lock->notify_all(); | |
5933 } | |
5934 | |
5935 if (G1ConcRegionFreeingVerbose) { | |
5936 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5937 "reset free regions coming"); | |
342 | 5938 } |
5939 } | |
5940 | |
2152 | 5941 void G1CollectedHeap::wait_while_free_regions_coming() { |
5942 // Most of the time we won't have to wait, so let's do a quick test | |
5943 // first before we take the lock. | |
5944 if (!free_regions_coming()) { | |
5945 return; | |
5946 } | |
5947 | |
5948 if (G1ConcRegionFreeingVerbose) { | |
5949 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5950 "waiting for free regions"); | |
342 | 5951 } |
5952 | |
5953 { | |
2152 | 5954 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5955 while (free_regions_coming()) { | |
5956 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5957 } |
2152 | 5958 } |
5959 | |
5960 if (G1ConcRegionFreeingVerbose) { | |
5961 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5962 "done waiting for free regions"); | |
5963 } | |
342 | 5964 } |
5965 | |
5966 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5967 assert(heap_lock_held_for_gc(), | |
5968 "the heap lock should already be held by or for this thread"); | |
5969 _young_list->push_region(hr); | |
5970 } | |
5971 | |
5972 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5973 private: | |
5974 bool _success; | |
5975 public: | |
5976 NoYoungRegionsClosure() : _success(true) { } | |
5977 bool doHeapRegion(HeapRegion* r) { | |
5978 if (r->is_young()) { | |
5979 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5980 r->bottom(), r->end()); | |
5981 _success = false; | |
5982 } | |
5983 return false; | |
5984 } | |
5985 bool success() { return _success; } | |
5986 }; | |
5987 | |
1394
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5988 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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5989 bool ret = _young_list->check_list_empty(check_sample); |
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|
5990 |
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|
5991 if (check_heap) { |
342 | 5992 NoYoungRegionsClosure closure; |
5993 heap_region_iterate(&closure); | |
5994 ret = ret && closure.success(); | |
5995 } | |
5996 | |
5997 return ret; | |
5998 } | |
5999 | |
4072 | 6000 class TearDownRegionSetsClosure : public HeapRegionClosure { |
6001 private: | |
6002 OldRegionSet *_old_set; | |
2152 | 6003 |
342 | 6004 public: |
4072 | 6005 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 6006 |
342 | 6007 bool doHeapRegion(HeapRegion* r) { |
4072 | 6008 if (r->is_empty()) { |
6009 // We ignore empty regions, we'll empty the free list afterwards | |
6010 } else if (r->is_young()) { | |
6011 // We ignore young regions, we'll empty the young list afterwards | |
6012 } else if (r->isHumongous()) { | |
6013 // We ignore humongous regions, we're not tearing down the | |
6014 // humongous region set | |
342 | 6015 } else { |
4072 | 6016 // The rest should be old |
6017 _old_set->remove(r); | |
342 | 6018 } |
6019 return false; | |
6020 } | |
6021 | |
4072 | 6022 ~TearDownRegionSetsClosure() { |
6023 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 6024 } |
342 | 6025 }; |
6026 | |
4072 | 6027 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
6028 assert_at_safepoint(true /* should_be_vm_thread */); | |
6029 | |
6030 if (!free_list_only) { | |
6031 TearDownRegionSetsClosure cl(&_old_set); | |
6032 heap_region_iterate(&cl); | |
6033 | |
6034 // Need to do this after the heap iteration to be able to | |
6035 // recognize the young regions and ignore them during the iteration. | |
6036 _young_list->empty_list(); | |
6037 } | |
6038 _free_list.remove_all(); | |
6039 } | |
6040 | |
6041 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
6042 private: | |
6043 bool _free_list_only; | |
6044 OldRegionSet* _old_set; | |
6045 FreeRegionList* _free_list; | |
6046 size_t _total_used; | |
6047 | |
6048 public: | |
6049 RebuildRegionSetsClosure(bool free_list_only, | |
6050 OldRegionSet* old_set, FreeRegionList* free_list) : | |
6051 _free_list_only(free_list_only), | |
6052 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
6053 assert(_free_list->is_empty(), "pre-condition"); | |
6054 if (!free_list_only) { | |
6055 assert(_old_set->is_empty(), "pre-condition"); | |
6056 } | |
6057 } | |
6058 | |
6059 bool doHeapRegion(HeapRegion* r) { | |
6060 if (r->continuesHumongous()) { | |
6061 return false; | |
6062 } | |
6063 | |
6064 if (r->is_empty()) { | |
6065 // Add free regions to the free list | |
6066 _free_list->add_as_tail(r); | |
6067 } else if (!_free_list_only) { | |
6068 assert(!r->is_young(), "we should not come across young regions"); | |
6069 | |
6070 if (r->isHumongous()) { | |
6071 // We ignore humongous regions, we left the humongous set unchanged | |
6072 } else { | |
6073 // The rest should be old, add them to the old set | |
6074 _old_set->add(r); | |
6075 } | |
6076 _total_used += r->used(); | |
6077 } | |
6078 | |
6079 return false; | |
6080 } | |
6081 | |
6082 size_t total_used() { | |
6083 return _total_used; | |
6084 } | |
6085 }; | |
6086 | |
6087 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
6088 assert_at_safepoint(true /* should_be_vm_thread */); | |
6089 | |
6090 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
6091 heap_region_iterate(&cl); | |
6092 | |
6093 if (!free_list_only) { | |
6094 _summary_bytes_used = cl.total_used(); | |
6095 } | |
6096 assert(_summary_bytes_used == recalculate_used(), | |
6097 err_msg("inconsistent _summary_bytes_used, " | |
6098 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
6099 _summary_bytes_used, recalculate_used())); | |
342 | 6100 } |
6101 | |
6102 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
6103 _refine_cte_cl->set_concurrent(concurrent); | |
6104 } | |
6105 | |
6106 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
6107 HeapRegion* hr = heap_region_containing(p); | |
6108 if (hr == NULL) { | |
6109 return is_in_permanent(p); | |
6110 } else { | |
6111 return hr->is_in(p); | |
6112 } | |
6113 } | |
2152 | 6114 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
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|
6115 // Methods for the mutator alloc region |
f44782f04dd4
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diff
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|
6116 |
2433
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|
6117 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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|
6118 bool force) { |
abdfc822206f
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diff
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|
6119 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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|
6120 assert(!force || g1_policy()->can_expand_young_list(), |
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diff
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|
6121 "if force is true we should be able to expand the young list"); |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
6122 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
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|
6123 if (force || !young_list_full) { |
2433
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|
6124 HeapRegion* new_alloc_region = new_region(word_size, |
abdfc822206f
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diff
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|
6125 false /* do_expand */); |
abdfc822206f
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diff
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|
6126 if (new_alloc_region != NULL) { |
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|
6127 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
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|
6128 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
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diff
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|
6129 return new_alloc_region; |
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diff
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|
6130 } |
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|
6131 } |
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diff
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|
6132 return NULL; |
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diff
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|
6133 } |
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|
6134 |
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|
6135 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
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diff
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|
6136 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6137 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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|
6138 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
abdfc822206f
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|
6139 |
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diff
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|
6140 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
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|
6141 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
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diff
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|
6142 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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diff
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|
6143 // We update the eden sizes here, when the region is retired, |
8229bd737950
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diff
changeset
|
6144 // instead of when it's allocated, since this is the point that its |
8229bd737950
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diff
changeset
|
6145 // used space has been recored in _summary_bytes_used. |
8229bd737950
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changeset
|
6146 g1mm()->update_eden_size(); |
2433
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diff
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|
6147 } |
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|
6148 |
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|
6149 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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diff
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|
6150 bool force) { |
abdfc822206f
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diff
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|
6151 return _g1h->new_mutator_alloc_region(word_size, force); |
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|
6152 } |
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|
6153 |
4095
bca17e38de00
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diff
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|
6154 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
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diff
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|
6155 // Don't change the number of workers. Use the value previously set |
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diff
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|
6156 // in the workgroup. |
4711 | 6157 assert(G1CollectedHeap::use_parallel_gc_threads(), "shouldn't be here otherwise"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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diff
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|
6158 uint n_workers = workers()->active_workers(); |
4711 | 6159 assert(UseDynamicNumberOfGCThreads || |
4095
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6160 n_workers == workers()->total_workers(), |
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6161 "Otherwise should be using the total number of workers"); |
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6162 if (n_workers == 0) { |
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6163 assert(false, "Should have been set in prior evacuation pause."); |
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6164 n_workers = ParallelGCThreads; |
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6165 workers()->set_active_workers(n_workers); |
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6166 } |
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6167 set_par_threads(n_workers); |
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6168 } |
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6169 |
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6170 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
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6171 size_t allocated_bytes) { |
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6172 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
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6173 } |
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6174 |
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6175 // Methods for the GC alloc regions |
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6176 |
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6177 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
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6178 size_t count, |
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6179 GCAllocPurpose ap) { |
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6180 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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6181 |
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6182 if (count < g1_policy()->max_regions(ap)) { |
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6183 HeapRegion* new_alloc_region = new_region(word_size, |
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6184 true /* do_expand */); |
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6185 if (new_alloc_region != NULL) { |
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6186 // We really only need to do this for old regions given that we |
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6187 // should never scan survivors. But it doesn't hurt to do it |
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6188 // for survivors too. |
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6189 new_alloc_region->set_saved_mark(); |
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6190 if (ap == GCAllocForSurvived) { |
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6191 new_alloc_region->set_survivor(); |
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6192 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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6193 } else { |
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6194 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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6195 } |
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6196 return new_alloc_region; |
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6197 } else { |
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6198 g1_policy()->note_alloc_region_limit_reached(ap); |
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6199 } |
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6200 } |
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6201 return NULL; |
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6202 } |
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6203 |
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6204 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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6205 size_t allocated_bytes, |
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6206 GCAllocPurpose ap) { |
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6207 alloc_region->note_end_of_copying(); |
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6208 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6209 if (ap == GCAllocForSurvived) { |
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6210 young_list()->add_survivor_region(alloc_region); |
4072 | 6211 } else { |
6212 _old_set.add(alloc_region); | |
3830
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6213 } |
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6214 _hr_printer.retire(alloc_region); |
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|
6215 } |
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|
6216 |
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6217 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6218 bool force) { |
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6219 assert(!force, "not supported for GC alloc regions"); |
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6220 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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|
6221 } |
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|
6222 |
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|
6223 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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|
6224 size_t allocated_bytes) { |
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6225 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6226 GCAllocForSurvived); |
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|
6227 } |
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|
6228 |
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6229 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6230 bool force) { |
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|
6231 assert(!force, "not supported for GC alloc regions"); |
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6232 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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|
6233 } |
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|
6234 |
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6235 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6236 size_t allocated_bytes) { |
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6237 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6238 GCAllocForTenured); |
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6239 } |
2433
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|
6240 // Heap region set verification |
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|
6241 |
2152 | 6242 class VerifyRegionListsClosure : public HeapRegionClosure { |
6243 private: | |
4072 | 6244 FreeRegionList* _free_list; |
6245 OldRegionSet* _old_set; | |
2152 | 6246 HumongousRegionSet* _humongous_set; |
6247 size_t _region_count; | |
6248 | |
6249 public: | |
4072 | 6250 VerifyRegionListsClosure(OldRegionSet* old_set, |
6251 HumongousRegionSet* humongous_set, | |
2152 | 6252 FreeRegionList* free_list) : |
4072 | 6253 _old_set(old_set), _humongous_set(humongous_set), |
6254 _free_list(free_list), _region_count(0) { } | |
2152 | 6255 |
6256 size_t region_count() { return _region_count; } | |
6257 | |
6258 bool doHeapRegion(HeapRegion* hr) { | |
6259 _region_count += 1; | |
6260 | |
6261 if (hr->continuesHumongous()) { | |
6262 return false; | |
6263 } | |
6264 | |
6265 if (hr->is_young()) { | |
6266 // TODO | |
6267 } else if (hr->startsHumongous()) { | |
6268 _humongous_set->verify_next_region(hr); | |
6269 } else if (hr->is_empty()) { | |
6270 _free_list->verify_next_region(hr); | |
4072 | 6271 } else { |
6272 _old_set->verify_next_region(hr); | |
2152 | 6273 } |
6274 return false; | |
6275 } | |
6276 }; | |
6277 | |
3766 | 6278 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
6279 HeapWord* bottom) { | |
6280 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6281 MemRegion mr(bottom, end); | |
6282 assert(_g1_reserved.contains(mr), "invariant"); | |
6283 // This might return NULL if the allocation fails | |
6284 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
6285 } | |
6286 | |
2152 | 6287 void G1CollectedHeap::verify_region_sets() { |
6288 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6289 | |
6290 // First, check the explicit lists. | |
6291 _free_list.verify(); | |
6292 { | |
6293 // Given that a concurrent operation might be adding regions to | |
6294 // the secondary free list we have to take the lock before | |
6295 // verifying it. | |
6296 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6297 _secondary_free_list.verify(); | |
6298 } | |
4072 | 6299 _old_set.verify(); |
2152 | 6300 _humongous_set.verify(); |
6301 | |
6302 // If a concurrent region freeing operation is in progress it will | |
6303 // be difficult to correctly attributed any free regions we come | |
6304 // across to the correct free list given that they might belong to | |
6305 // one of several (free_list, secondary_free_list, any local lists, | |
6306 // etc.). So, if that's the case we will skip the rest of the | |
6307 // verification operation. Alternatively, waiting for the concurrent | |
6308 // operation to complete will have a non-trivial effect on the GC's | |
6309 // operation (no concurrent operation will last longer than the | |
6310 // interval between two calls to verification) and it might hide | |
6311 // any issues that we would like to catch during testing. | |
6312 if (free_regions_coming()) { | |
6313 return; | |
6314 } | |
6315 | |
2361 | 6316 // Make sure we append the secondary_free_list on the free_list so |
6317 // that all free regions we will come across can be safely | |
6318 // attributed to the free_list. | |
6319 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6320 |
6321 // Finally, make sure that the region accounting in the lists is | |
6322 // consistent with what we see in the heap. | |
4072 | 6323 _old_set.verify_start(); |
2152 | 6324 _humongous_set.verify_start(); |
6325 _free_list.verify_start(); | |
6326 | |
4072 | 6327 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6328 heap_region_iterate(&cl); |
6329 | |
4072 | 6330 _old_set.verify_end(); |
2152 | 6331 _humongous_set.verify_end(); |
6332 _free_list.verify_end(); | |
342 | 6333 } |