Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4834:6a78aa6ac1ff
7132311: G1: assert((s == klass->oop_size(this)) || (Universe::heap()->is_gc_active() && ((is_typeArray()...
Summary: Move the check for when to call collect() to before we do a humongous object allocation
Reviewed-by: stefank, tonyp
author | brutisso |
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date | Mon, 23 Jan 2012 20:36:16 +0100 |
parents | 57025542827f |
children | d30fa85f9994 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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35 #include "gc_implementation/g1/g1EvacFailure.hpp" |
1972 | 36 #include "gc_implementation/g1/g1MarkSweep.hpp" |
37 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
38 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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39 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 40 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
41 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
42 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
43 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
44 #include "memory/gcLocker.inline.hpp" | |
45 #include "memory/genOopClosures.inline.hpp" | |
46 #include "memory/generationSpec.hpp" | |
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47 #include "memory/referenceProcessor.hpp" |
1972 | 48 #include "oops/oop.inline.hpp" |
49 #include "oops/oop.pcgc.inline.hpp" | |
50 #include "runtime/aprofiler.hpp" | |
51 #include "runtime/vmThread.hpp" | |
342 | 52 |
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53 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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54 |
342 | 55 // turn it on so that the contents of the young list (scan-only / |
56 // to-be-collected) are printed at "strategic" points before / during | |
57 // / after the collection --- this is useful for debugging | |
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58 #define YOUNG_LIST_VERBOSE 0 |
342 | 59 // CURRENT STATUS |
60 // This file is under construction. Search for "FIXME". | |
61 | |
62 // INVARIANTS/NOTES | |
63 // | |
64 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 65 // serialized by acquiring the HeapLock. This happens in mem_allocate |
66 // and allocate_new_tlab, which are the "entry" points to the | |
67 // allocation code from the rest of the JVM. (Note that this does not | |
68 // apply to TLAB allocation, which is not part of this interface: it | |
69 // is done by clients of this interface.) | |
342 | 70 |
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71 // Notes on implementation of parallelism in different tasks. |
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72 // |
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73 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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74 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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75 // It does use run_task() which sets _n_workers in the task. |
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76 // G1ParTask executes g1_process_strong_roots() -> |
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77 // SharedHeap::process_strong_roots() which calls eventuall to |
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78 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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79 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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80 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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81 // |
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82 |
342 | 83 // Local to this file. |
84 | |
85 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
86 SuspendibleThreadSet* _sts; | |
87 G1RemSet* _g1rs; | |
88 ConcurrentG1Refine* _cg1r; | |
89 bool _concurrent; | |
90 public: | |
91 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
92 G1RemSet* g1rs, | |
93 ConcurrentG1Refine* cg1r) : | |
94 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
95 {} | |
96 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 97 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
98 // This path is executed by the concurrent refine or mutator threads, | |
99 // concurrently, and so we do not care if card_ptr contains references | |
100 // that point into the collection set. | |
101 assert(!oops_into_cset, "should be"); | |
102 | |
342 | 103 if (_concurrent && _sts->should_yield()) { |
104 // Caller will actually yield. | |
105 return false; | |
106 } | |
107 // Otherwise, we finished successfully; return true. | |
108 return true; | |
109 } | |
110 void set_concurrent(bool b) { _concurrent = b; } | |
111 }; | |
112 | |
113 | |
114 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
115 int _calls; | |
116 G1CollectedHeap* _g1h; | |
117 CardTableModRefBS* _ctbs; | |
118 int _histo[256]; | |
119 public: | |
120 ClearLoggedCardTableEntryClosure() : | |
121 _calls(0) | |
122 { | |
123 _g1h = G1CollectedHeap::heap(); | |
124 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
125 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
126 } | |
127 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
128 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
129 _calls++; | |
130 unsigned char* ujb = (unsigned char*)card_ptr; | |
131 int ind = (int)(*ujb); | |
132 _histo[ind]++; | |
133 *card_ptr = -1; | |
134 } | |
135 return true; | |
136 } | |
137 int calls() { return _calls; } | |
138 void print_histo() { | |
139 gclog_or_tty->print_cr("Card table value histogram:"); | |
140 for (int i = 0; i < 256; i++) { | |
141 if (_histo[i] != 0) { | |
142 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
143 } | |
144 } | |
145 } | |
146 }; | |
147 | |
148 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
149 int _calls; | |
150 G1CollectedHeap* _g1h; | |
151 CardTableModRefBS* _ctbs; | |
152 public: | |
153 RedirtyLoggedCardTableEntryClosure() : | |
154 _calls(0) | |
155 { | |
156 _g1h = G1CollectedHeap::heap(); | |
157 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
158 } | |
159 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
160 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
161 _calls++; | |
162 *card_ptr = 0; | |
163 } | |
164 return true; | |
165 } | |
166 int calls() { return _calls; } | |
167 }; | |
168 | |
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169 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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170 public: |
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171 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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172 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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173 return true; |
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174 } |
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175 }; |
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176 |
342 | 177 YoungList::YoungList(G1CollectedHeap* g1h) |
178 : _g1h(g1h), _head(NULL), | |
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179 _length(0), |
342 | 180 _last_sampled_rs_lengths(0), |
545 | 181 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 182 { |
183 guarantee( check_list_empty(false), "just making sure..." ); | |
184 } | |
185 | |
186 void YoungList::push_region(HeapRegion *hr) { | |
187 assert(!hr->is_young(), "should not already be young"); | |
188 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
189 | |
190 hr->set_next_young_region(_head); | |
191 _head = hr; | |
192 | |
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193 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 194 ++_length; |
195 } | |
196 | |
197 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 198 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 199 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
200 | |
201 hr->set_next_young_region(_survivor_head); | |
202 if (_survivor_head == NULL) { | |
545 | 203 _survivor_tail = hr; |
342 | 204 } |
205 _survivor_head = hr; | |
206 ++_survivor_length; | |
207 } | |
208 | |
209 void YoungList::empty_list(HeapRegion* list) { | |
210 while (list != NULL) { | |
211 HeapRegion* next = list->get_next_young_region(); | |
212 list->set_next_young_region(NULL); | |
213 list->uninstall_surv_rate_group(); | |
214 list->set_not_young(); | |
215 list = next; | |
216 } | |
217 } | |
218 | |
219 void YoungList::empty_list() { | |
220 assert(check_list_well_formed(), "young list should be well formed"); | |
221 | |
222 empty_list(_head); | |
223 _head = NULL; | |
224 _length = 0; | |
225 | |
226 empty_list(_survivor_head); | |
227 _survivor_head = NULL; | |
545 | 228 _survivor_tail = NULL; |
342 | 229 _survivor_length = 0; |
230 | |
231 _last_sampled_rs_lengths = 0; | |
232 | |
233 assert(check_list_empty(false), "just making sure..."); | |
234 } | |
235 | |
236 bool YoungList::check_list_well_formed() { | |
237 bool ret = true; | |
238 | |
239 size_t length = 0; | |
240 HeapRegion* curr = _head; | |
241 HeapRegion* last = NULL; | |
242 while (curr != NULL) { | |
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243 if (!curr->is_young()) { |
342 | 244 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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245 "incorrectly tagged (y: %d, surv: %d)", |
342 | 246 curr->bottom(), curr->end(), |
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247 curr->is_young(), curr->is_survivor()); |
342 | 248 ret = false; |
249 } | |
250 ++length; | |
251 last = curr; | |
252 curr = curr->get_next_young_region(); | |
253 } | |
254 ret = ret && (length == _length); | |
255 | |
256 if (!ret) { | |
257 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
258 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
259 length, _length); | |
260 } | |
261 | |
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262 return ret; |
342 | 263 } |
264 | |
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265 bool YoungList::check_list_empty(bool check_sample) { |
342 | 266 bool ret = true; |
267 | |
268 if (_length != 0) { | |
269 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
270 _length); | |
271 ret = false; | |
272 } | |
273 if (check_sample && _last_sampled_rs_lengths != 0) { | |
274 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
275 ret = false; | |
276 } | |
277 if (_head != NULL) { | |
278 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
279 ret = false; | |
280 } | |
281 if (!ret) { | |
282 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
283 } | |
284 | |
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285 return ret; |
342 | 286 } |
287 | |
288 void | |
289 YoungList::rs_length_sampling_init() { | |
290 _sampled_rs_lengths = 0; | |
291 _curr = _head; | |
292 } | |
293 | |
294 bool | |
295 YoungList::rs_length_sampling_more() { | |
296 return _curr != NULL; | |
297 } | |
298 | |
299 void | |
300 YoungList::rs_length_sampling_next() { | |
301 assert( _curr != NULL, "invariant" ); | |
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302 size_t rs_length = _curr->rem_set()->occupied(); |
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303 |
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304 _sampled_rs_lengths += rs_length; |
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305 |
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306 // The current region may not yet have been added to the |
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307 // incremental collection set (it gets added when it is |
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308 // retired as the current allocation region). |
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309 if (_curr->in_collection_set()) { |
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310 // Update the collection set policy information for this region |
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311 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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312 } |
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313 |
342 | 314 _curr = _curr->get_next_young_region(); |
315 if (_curr == NULL) { | |
316 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
317 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
318 } | |
319 } | |
320 | |
321 void | |
322 YoungList::reset_auxilary_lists() { | |
323 guarantee( is_empty(), "young list should be empty" ); | |
324 assert(check_list_well_formed(), "young list should be well formed"); | |
325 | |
326 // Add survivor regions to SurvRateGroup. | |
327 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 328 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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329 |
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330 int young_index_in_cset = 0; |
342 | 331 for (HeapRegion* curr = _survivor_head; |
332 curr != NULL; | |
333 curr = curr->get_next_young_region()) { | |
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334 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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335 |
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336 // The region is a non-empty survivor so let's add it to |
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337 // the incremental collection set for the next evacuation |
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338 // pause. |
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339 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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340 young_index_in_cset += 1; |
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341 } |
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342 assert((size_t) young_index_in_cset == _survivor_length, |
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343 "post-condition"); |
342 | 344 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
345 | |
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346 _head = _survivor_head; |
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347 _length = _survivor_length; |
342 | 348 if (_survivor_head != NULL) { |
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349 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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350 assert(_survivor_length > 0, "invariant"); |
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351 _survivor_tail->set_next_young_region(NULL); |
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352 } |
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353 |
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354 // Don't clear the survivor list handles until the start of |
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355 // the next evacuation pause - we need it in order to re-tag |
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356 // the survivor regions from this evacuation pause as 'young' |
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357 // at the start of the next. |
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358 |
545 | 359 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 360 |
361 assert(check_list_well_formed(), "young list should be well formed"); | |
362 } | |
363 | |
364 void YoungList::print() { | |
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365 HeapRegion* lists[] = {_head, _survivor_head}; |
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366 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 367 |
368 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
369 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
370 HeapRegion *curr = lists[list]; | |
371 if (curr == NULL) | |
372 gclog_or_tty->print_cr(" empty"); | |
373 while (curr != NULL) { | |
374 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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375 "age: %4d, y: %d, surv: %d", |
342 | 376 curr->bottom(), curr->end(), |
377 curr->top(), | |
378 curr->prev_top_at_mark_start(), | |
379 curr->next_top_at_mark_start(), | |
380 curr->top_at_conc_mark_count(), | |
381 curr->age_in_surv_rate_group_cond(), | |
382 curr->is_young(), | |
383 curr->is_survivor()); | |
384 curr = curr->get_next_young_region(); | |
385 } | |
386 } | |
387 | |
388 gclog_or_tty->print_cr(""); | |
389 } | |
390 | |
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391 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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392 { |
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393 // Claim the right to put the region on the dirty cards region list |
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394 // by installing a self pointer. |
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395 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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396 if (next == NULL) { |
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397 HeapRegion* res = (HeapRegion*) |
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398 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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399 NULL); |
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400 if (res == NULL) { |
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401 HeapRegion* head; |
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402 do { |
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403 // Put the region to the dirty cards region list. |
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404 head = _dirty_cards_region_list; |
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405 next = (HeapRegion*) |
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406 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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407 if (next == head) { |
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408 assert(hr->get_next_dirty_cards_region() == hr, |
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409 "hr->get_next_dirty_cards_region() != hr"); |
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410 if (next == NULL) { |
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411 // The last region in the list points to itself. |
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412 hr->set_next_dirty_cards_region(hr); |
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413 } else { |
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414 hr->set_next_dirty_cards_region(next); |
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415 } |
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416 } |
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417 } while (next != head); |
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418 } |
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419 } |
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420 } |
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421 |
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422 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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423 { |
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424 HeapRegion* head; |
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425 HeapRegion* hr; |
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426 do { |
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427 head = _dirty_cards_region_list; |
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428 if (head == NULL) { |
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429 return NULL; |
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430 } |
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431 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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432 if (head == new_head) { |
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433 // The last region. |
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434 new_head = NULL; |
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435 } |
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436 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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437 head); |
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438 } while (hr != head); |
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439 assert(hr != NULL, "invariant"); |
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440 hr->set_next_dirty_cards_region(NULL); |
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441 return hr; |
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442 } |
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443 |
342 | 444 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 445 _cg1r->stop(); |
342 | 446 _cmThread->stop(); |
447 } | |
448 | |
3377
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449 #ifdef ASSERT |
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450 // A region is added to the collection set as it is retired |
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451 // so an address p can point to a region which will be in the |
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452 // collection set but has not yet been retired. This method |
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453 // therefore is only accurate during a GC pause after all |
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454 // regions have been retired. It is used for debugging |
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455 // to check if an nmethod has references to objects that can |
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456 // be move during a partial collection. Though it can be |
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457 // inaccurate, it is sufficient for G1 because the conservative |
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458 // implementation of is_scavengable() for G1 will indicate that |
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459 // all nmethods must be scanned during a partial collection. |
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460 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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461 HeapRegion* hr = heap_region_containing(p); |
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462 return hr != NULL && hr->in_collection_set(); |
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463 } |
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464 #endif |
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465 |
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466 // Returns true if the reference points to an object that |
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467 // can move in an incremental collecction. |
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468 bool G1CollectedHeap::is_scavengable(const void* p) { |
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469 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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470 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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471 HeapRegion* hr = heap_region_containing(p); |
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472 if (hr == NULL) { |
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473 // perm gen (or null) |
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474 return false; |
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475 } else { |
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476 return !hr->isHumongous(); |
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477 } |
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478 } |
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479 |
342 | 480 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
481 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
482 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
483 | |
484 // Count the dirty cards at the start. | |
485 CountNonCleanMemRegionClosure count1(this); | |
486 ct_bs->mod_card_iterate(&count1); | |
487 int orig_count = count1.n(); | |
488 | |
489 // First clear the logged cards. | |
490 ClearLoggedCardTableEntryClosure clear; | |
491 dcqs.set_closure(&clear); | |
492 dcqs.apply_closure_to_all_completed_buffers(); | |
493 dcqs.iterate_closure_all_threads(false); | |
494 clear.print_histo(); | |
495 | |
496 // Now ensure that there's no dirty cards. | |
497 CountNonCleanMemRegionClosure count2(this); | |
498 ct_bs->mod_card_iterate(&count2); | |
499 if (count2.n() != 0) { | |
500 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
501 count2.n(), orig_count); | |
502 } | |
503 guarantee(count2.n() == 0, "Card table should be clean."); | |
504 | |
505 RedirtyLoggedCardTableEntryClosure redirty; | |
506 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
507 dcqs.apply_closure_to_all_completed_buffers(); | |
508 dcqs.iterate_closure_all_threads(false); | |
509 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
510 clear.calls(), orig_count); | |
511 guarantee(redirty.calls() == clear.calls(), | |
512 "Or else mechanism is broken."); | |
513 | |
514 CountNonCleanMemRegionClosure count3(this); | |
515 ct_bs->mod_card_iterate(&count3); | |
516 if (count3.n() != orig_count) { | |
517 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
518 orig_count, count3.n()); | |
519 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
520 } | |
521 | |
522 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
523 } | |
524 | |
525 // Private class members. | |
526 | |
527 G1CollectedHeap* G1CollectedHeap::_g1h; | |
528 | |
529 // Private methods. | |
530 | |
2152 | 531 HeapRegion* |
2361 | 532 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 533 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
534 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
535 if (!_secondary_free_list.is_empty()) { | |
536 if (G1ConcRegionFreeingVerbose) { | |
537 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
538 "secondary_free_list has "SIZE_FORMAT" entries", | |
539 _secondary_free_list.length()); | |
540 } | |
541 // It looks as if there are free regions available on the | |
542 // secondary_free_list. Let's move them to the free_list and try | |
543 // again to allocate from it. | |
544 append_secondary_free_list(); | |
545 | |
546 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
547 "empty we should have moved at least one entry to the free_list"); | |
548 HeapRegion* res = _free_list.remove_head(); | |
549 if (G1ConcRegionFreeingVerbose) { | |
550 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
551 "allocated "HR_FORMAT" from secondary_free_list", | |
552 HR_FORMAT_PARAMS(res)); | |
553 } | |
554 return res; | |
555 } | |
556 | |
557 // Wait here until we get notifed either when (a) there are no | |
558 // more free regions coming or (b) some regions have been moved on | |
559 // the secondary_free_list. | |
560 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
561 } | |
562 | |
563 if (G1ConcRegionFreeingVerbose) { | |
564 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
565 "could not allocate from secondary_free_list"); | |
566 } | |
567 return NULL; | |
568 } | |
569 | |
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570 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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571 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 572 "the only time we use this to allocate a humongous region is " |
573 "when we are allocating a single humongous region"); | |
574 | |
575 HeapRegion* res; | |
576 if (G1StressConcRegionFreeing) { | |
577 if (!_secondary_free_list.is_empty()) { | |
578 if (G1ConcRegionFreeingVerbose) { | |
579 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
580 "forced to look at the secondary_free_list"); | |
581 } | |
2361 | 582 res = new_region_try_secondary_free_list(); |
2152 | 583 if (res != NULL) { |
584 return res; | |
585 } | |
586 } | |
587 } | |
588 res = _free_list.remove_head_or_null(); | |
589 if (res == NULL) { | |
590 if (G1ConcRegionFreeingVerbose) { | |
591 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
592 "res == NULL, trying the secondary_free_list"); | |
593 } | |
2361 | 594 res = new_region_try_secondary_free_list(); |
2152 | 595 } |
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596 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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597 // Currently, only attempts to allocate GC alloc regions set |
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598 // do_expand to true. So, we should only reach here during a |
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599 // safepoint. If this assumption changes we might have to |
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600 // reconsider the use of _expand_heap_after_alloc_failure. |
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601 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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602 |
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603 ergo_verbose1(ErgoHeapSizing, |
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604 "attempt heap expansion", |
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605 ergo_format_reason("region allocation request failed") |
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606 ergo_format_byte("allocation request"), |
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607 word_size * HeapWordSize); |
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608 if (expand(word_size * HeapWordSize)) { |
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609 // Given that expand() succeeded in expanding the heap, and we |
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610 // always expand the heap by an amount aligned to the heap |
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611 // region size, the free list should in theory not be empty. So |
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612 // it would probably be OK to use remove_head(). But the extra |
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613 // check for NULL is unlikely to be a performance issue here (we |
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614 // just expanded the heap!) so let's just be conservative and |
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615 // use remove_head_or_null(). |
3766 | 616 res = _free_list.remove_head_or_null(); |
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617 } else { |
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618 _expand_heap_after_alloc_failure = false; |
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619 } |
342 | 620 } |
621 return res; | |
622 } | |
623 | |
3766 | 624 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
625 size_t word_size) { | |
2361 | 626 assert(isHumongous(word_size), "word_size should be humongous"); |
627 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
628 | |
3766 | 629 size_t first = G1_NULL_HRS_INDEX; |
2152 | 630 if (num_regions == 1) { |
631 // Only one region to allocate, no need to go through the slower | |
632 // path. The caller will attempt the expasion if this fails, so | |
633 // let's not try to expand here too. | |
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634 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 635 if (hr != NULL) { |
636 first = hr->hrs_index(); | |
637 } else { | |
3766 | 638 first = G1_NULL_HRS_INDEX; |
2152 | 639 } |
640 } else { | |
641 // We can't allocate humongous regions while cleanupComplete() is | |
642 // running, since some of the regions we find to be empty might not | |
643 // yet be added to the free list and it is not straightforward to | |
644 // know which list they are on so that we can remove them. Note | |
645 // that we only need to do this if we need to allocate more than | |
646 // one region to satisfy the current humongous allocation | |
647 // request. If we are only allocating one region we use the common | |
648 // region allocation code (see above). | |
649 wait_while_free_regions_coming(); | |
2361 | 650 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 651 |
652 if (free_regions() >= num_regions) { | |
3766 | 653 first = _hrs.find_contiguous(num_regions); |
654 if (first != G1_NULL_HRS_INDEX) { | |
655 for (size_t i = first; i < first + num_regions; ++i) { | |
656 HeapRegion* hr = region_at(i); | |
2152 | 657 assert(hr->is_empty(), "sanity"); |
2361 | 658 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 659 hr->set_pending_removal(true); |
660 } | |
661 _free_list.remove_all_pending(num_regions); | |
662 } | |
663 } | |
664 } | |
665 return first; | |
666 } | |
667 | |
2361 | 668 HeapWord* |
3766 | 669 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 670 size_t num_regions, |
671 size_t word_size) { | |
3766 | 672 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 673 assert(isHumongous(word_size), "word_size should be humongous"); |
674 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
675 | |
676 // Index of last region in the series + 1. | |
3766 | 677 size_t last = first + num_regions; |
2361 | 678 |
679 // We need to initialize the region(s) we just discovered. This is | |
680 // a bit tricky given that it can happen concurrently with | |
681 // refinement threads refining cards on these regions and | |
682 // potentially wanting to refine the BOT as they are scanning | |
683 // those cards (this can happen shortly after a cleanup; see CR | |
684 // 6991377). So we have to set up the region(s) carefully and in | |
685 // a specific order. | |
686 | |
687 // The word size sum of all the regions we will allocate. | |
688 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
689 assert(word_size <= word_size_sum, "sanity"); | |
690 | |
691 // This will be the "starts humongous" region. | |
3766 | 692 HeapRegion* first_hr = region_at(first); |
2361 | 693 // The header of the new object will be placed at the bottom of |
694 // the first region. | |
695 HeapWord* new_obj = first_hr->bottom(); | |
696 // This will be the new end of the first region in the series that | |
697 // should also match the end of the last region in the seriers. | |
698 HeapWord* new_end = new_obj + word_size_sum; | |
699 // This will be the new top of the first region that will reflect | |
700 // this allocation. | |
701 HeapWord* new_top = new_obj + word_size; | |
702 | |
703 // First, we need to zero the header of the space that we will be | |
704 // allocating. When we update top further down, some refinement | |
705 // threads might try to scan the region. By zeroing the header we | |
706 // ensure that any thread that will try to scan the region will | |
707 // come across the zero klass word and bail out. | |
708 // | |
709 // NOTE: It would not have been correct to have used | |
710 // CollectedHeap::fill_with_object() and make the space look like | |
711 // an int array. The thread that is doing the allocation will | |
712 // later update the object header to a potentially different array | |
713 // type and, for a very short period of time, the klass and length | |
714 // fields will be inconsistent. This could cause a refinement | |
715 // thread to calculate the object size incorrectly. | |
716 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
717 | |
718 // We will set up the first region as "starts humongous". This | |
719 // will also update the BOT covering all the regions to reflect | |
720 // that there is a single object that starts at the bottom of the | |
721 // first region. | |
722 first_hr->set_startsHumongous(new_top, new_end); | |
723 | |
724 // Then, if there are any, we will set up the "continues | |
725 // humongous" regions. | |
726 HeapRegion* hr = NULL; | |
3766 | 727 for (size_t i = first + 1; i < last; ++i) { |
728 hr = region_at(i); | |
2361 | 729 hr->set_continuesHumongous(first_hr); |
730 } | |
731 // If we have "continues humongous" regions (hr != NULL), then the | |
732 // end of the last one should match new_end. | |
733 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
734 | |
735 // Up to this point no concurrent thread would have been able to | |
736 // do any scanning on any region in this series. All the top | |
737 // fields still point to bottom, so the intersection between | |
738 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
739 // update the top fields, we'll do a storestore to make sure that | |
740 // no thread sees the update to top before the zeroing of the | |
741 // object header and the BOT initialization. | |
742 OrderAccess::storestore(); | |
743 | |
744 // Now that the BOT and the object header have been initialized, | |
745 // we can update top of the "starts humongous" region. | |
746 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
747 "new_top should be in this region"); | |
748 first_hr->set_top(new_top); | |
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749 if (_hr_printer.is_active()) { |
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750 HeapWord* bottom = first_hr->bottom(); |
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751 HeapWord* end = first_hr->orig_end(); |
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752 if ((first + 1) == last) { |
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753 // the series has a single humongous region |
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754 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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755 } else { |
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756 // the series has more than one humongous regions |
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757 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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758 } |
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759 } |
2361 | 760 |
761 // Now, we will update the top fields of the "continues humongous" | |
762 // regions. The reason we need to do this is that, otherwise, | |
763 // these regions would look empty and this will confuse parts of | |
764 // G1. For example, the code that looks for a consecutive number | |
765 // of empty regions will consider them empty and try to | |
766 // re-allocate them. We can extend is_empty() to also include | |
767 // !continuesHumongous(), but it is easier to just update the top | |
768 // fields here. The way we set top for all regions (i.e., top == | |
769 // end for all regions but the last one, top == new_top for the | |
770 // last one) is actually used when we will free up the humongous | |
771 // region in free_humongous_region(). | |
772 hr = NULL; | |
3766 | 773 for (size_t i = first + 1; i < last; ++i) { |
774 hr = region_at(i); | |
2361 | 775 if ((i + 1) == last) { |
776 // last continues humongous region | |
777 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
778 "new_top should fall on this region"); | |
779 hr->set_top(new_top); | |
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780 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 781 } else { |
782 // not last one | |
783 assert(new_top > hr->end(), "new_top should be above this region"); | |
784 hr->set_top(hr->end()); | |
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785 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 786 } |
787 } | |
788 // If we have continues humongous regions (hr != NULL), then the | |
789 // end of the last one should match new_end and its top should | |
790 // match new_top. | |
791 assert(hr == NULL || | |
792 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
793 | |
794 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
795 _summary_bytes_used += first_hr->used(); | |
796 _humongous_set.add(first_hr); | |
797 | |
798 return new_obj; | |
799 } | |
800 | |
342 | 801 // If could fit into free regions w/o expansion, try. |
802 // Otherwise, if can expand, do so. | |
803 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 804 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 805 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
806 | |
807 verify_region_sets_optional(); | |
342 | 808 |
809 size_t num_regions = | |
1973 | 810 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 811 size_t x_size = expansion_regions(); |
3766 | 812 size_t fs = _hrs.free_suffix(); |
813 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
814 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 815 // The only thing we can do now is attempt expansion. |
342 | 816 if (fs + x_size >= num_regions) { |
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817 // If the number of regions we're trying to allocate for this |
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818 // object is at most the number of regions in the free suffix, |
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819 // then the call to humongous_obj_allocate_find_first() above |
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820 // should have succeeded and we wouldn't be here. |
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821 // |
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822 // We should only be trying to expand when the free suffix is |
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823 // not sufficient for the object _and_ we have some expansion |
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824 // room available. |
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825 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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826 |
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827 ergo_verbose1(ErgoHeapSizing, |
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828 "attempt heap expansion", |
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829 ergo_format_reason("humongous allocation request failed") |
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830 ergo_format_byte("allocation request"), |
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831 word_size * HeapWordSize); |
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832 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 833 // Even though the heap was expanded, it might not have |
834 // reached the desired size. So, we cannot assume that the | |
835 // allocation will succeed. | |
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836 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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837 } |
2152 | 838 } |
839 } | |
840 | |
2361 | 841 HeapWord* result = NULL; |
3766 | 842 if (first != G1_NULL_HRS_INDEX) { |
2361 | 843 result = |
844 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
845 assert(result != NULL, "it should always return a valid result"); | |
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846 |
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847 // A successful humongous object allocation changes the used space |
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848 // information of the old generation so we need to recalculate the |
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849 // sizes and update the jstat counters here. |
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850 g1mm()->update_sizes(); |
2152 | 851 } |
852 | |
853 verify_region_sets_optional(); | |
2361 | 854 |
855 return result; | |
342 | 856 } |
857 | |
1973 | 858 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
859 assert_heap_not_locked_and_not_at_safepoint(); | |
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860 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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861 |
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862 unsigned int dummy_gc_count_before; |
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863 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 864 } |
865 | |
866 HeapWord* | |
867 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 868 bool* gc_overhead_limit_was_exceeded) { |
869 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 870 |
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871 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 872 for (int try_count = 1; /* we'll return */; try_count += 1) { |
873 unsigned int gc_count_before; | |
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874 |
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875 HeapWord* result = NULL; |
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876 if (!isHumongous(word_size)) { |
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877 result = attempt_allocation(word_size, &gc_count_before); |
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878 } else { |
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879 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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880 } |
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881 if (result != NULL) { |
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882 return result; |
342 | 883 } |
884 | |
885 // Create the garbage collection operation... | |
1973 | 886 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 887 // ...and get the VM thread to execute it. |
888 VMThread::execute(&op); | |
1973 | 889 |
890 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
891 // If the operation was successful we'll return the result even | |
892 // if it is NULL. If the allocation attempt failed immediately | |
893 // after a Full GC, it's unlikely we'll be able to allocate now. | |
894 HeapWord* result = op.result(); | |
895 if (result != NULL && !isHumongous(word_size)) { | |
896 // Allocations that take place on VM operations do not do any | |
897 // card dirtying and we have to do it here. We only have to do | |
898 // this for non-humongous allocations, though. | |
899 dirty_young_block(result, word_size); | |
900 } | |
342 | 901 return result; |
1973 | 902 } else { |
903 assert(op.result() == NULL, | |
904 "the result should be NULL if the VM op did not succeed"); | |
342 | 905 } |
906 | |
907 // Give a warning if we seem to be looping forever. | |
908 if ((QueuedAllocationWarningCount > 0) && | |
909 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 910 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 911 } |
912 } | |
1973 | 913 |
914 ShouldNotReachHere(); | |
2433
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915 return NULL; |
342 | 916 } |
917 | |
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918 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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919 unsigned int *gc_count_before_ret) { |
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920 // Make sure you read the note in attempt_allocation_humongous(). |
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921 |
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922 assert_heap_not_locked_and_not_at_safepoint(); |
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923 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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924 "be called for humongous allocation requests"); |
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925 |
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926 // We should only get here after the first-level allocation attempt |
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927 // (attempt_allocation()) failed to allocate. |
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|
928 |
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929 // We will loop until a) we manage to successfully perform the |
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930 // allocation or b) we successfully schedule a collection which |
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931 // fails to perform the allocation. b) is the only case when we'll |
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932 // return NULL. |
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|
933 HeapWord* result = NULL; |
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934 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
935 bool should_try_gc; |
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|
936 unsigned int gc_count_before; |
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|
937 |
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|
938 { |
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939 MutexLockerEx x(Heap_lock); |
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|
940 |
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941 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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942 false /* bot_updates */); |
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943 if (result != NULL) { |
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|
944 return result; |
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|
945 } |
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|
946 |
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947 // If we reach here, attempt_allocation_locked() above failed to |
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948 // allocate a new region. So the mutator alloc region should be NULL. |
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949 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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950 |
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|
951 if (GC_locker::is_active_and_needs_gc()) { |
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|
952 if (g1_policy()->can_expand_young_list()) { |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
953 // No need for an ergo verbose message here, |
20213c8a3c40
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|
954 // can_expand_young_list() does this when it returns true. |
2433
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955 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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|
956 false /* bot_updates */); |
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|
957 if (result != NULL) { |
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|
958 return result; |
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|
959 } |
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|
960 } |
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|
961 should_try_gc = false; |
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|
962 } else { |
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963 // Read the GC count while still holding the Heap_lock. |
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964 gc_count_before = SharedHeap::heap()->total_collections(); |
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|
965 should_try_gc = true; |
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|
966 } |
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|
967 } |
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|
968 |
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|
969 if (should_try_gc) { |
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|
970 bool succeeded; |
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|
971 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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972 if (result != NULL) { |
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|
973 assert(succeeded, "only way to get back a non-NULL result"); |
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|
974 return result; |
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|
975 } |
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|
976 |
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|
977 if (succeeded) { |
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|
978 // If we get here we successfully scheduled a collection which |
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|
979 // failed to allocate. No point in trying to allocate |
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|
980 // further. We'll just return NULL. |
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|
981 MutexLockerEx x(Heap_lock); |
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982 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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|
983 return NULL; |
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|
984 } |
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|
985 } else { |
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|
986 GC_locker::stall_until_clear(); |
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|
987 } |
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|
988 |
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|
989 // We can reach here if we were unsuccessul in scheduling a |
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|
990 // collection (because another thread beat us to it) or if we were |
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|
991 // stalled due to the GC locker. In either can we should retry the |
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|
992 // allocation attempt in case another thread successfully |
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|
993 // performed a collection and reclaimed enough space. We do the |
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|
994 // first attempt (without holding the Heap_lock) here and the |
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|
995 // follow-on attempt will be at the start of the next loop |
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|
996 // iteration (after taking the Heap_lock). |
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|
997 result = _mutator_alloc_region.attempt_allocation(word_size, |
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|
998 false /* bot_updates */); |
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|
999 if (result != NULL ){ |
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|
1000 return result; |
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|
1001 } |
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|
1002 |
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|
1003 // Give a warning if we seem to be looping forever. |
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|
1004 if ((QueuedAllocationWarningCount > 0) && |
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|
1005 (try_count % QueuedAllocationWarningCount == 0)) { |
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|
1006 warning("G1CollectedHeap::attempt_allocation_slow() " |
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|
1007 "retries %d times", try_count); |
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|
1008 } |
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|
1009 } |
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|
1010 |
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|
1011 ShouldNotReachHere(); |
abdfc822206f
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|
1012 return NULL; |
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|
1013 } |
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|
1014 |
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1015 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1016 unsigned int * gc_count_before_ret) { |
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1017 // The structure of this method has a lot of similarities to |
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1018 // attempt_allocation_slow(). The reason these two were not merged |
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1019 // into a single one is that such a method would require several "if |
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1020 // allocation is not humongous do this, otherwise do that" |
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1021 // conditional paths which would obscure its flow. In fact, an early |
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1022 // version of this code did use a unified method which was harder to |
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1023 // follow and, as a result, it had subtle bugs that were hard to |
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1024 // track down. So keeping these two methods separate allows each to |
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1025 // be more readable. It will be good to keep these two in sync as |
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1026 // much as possible. |
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1027 |
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1028 assert_heap_not_locked_and_not_at_safepoint(); |
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1029 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1030 "should only be called for humongous allocations"); |
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1031 |
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1032 // Humongous objects can exhaust the heap quickly, so we should check if we |
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1033 // need to start a marking cycle at each humongous object allocation. We do |
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1034 // the check before we do the actual allocation. The reason for doing it |
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1035 // before the allocation is that we avoid having to keep track of the newly |
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1036 // allocated memory while we do a GC. |
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1037 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", word_size)) { |
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1038 collect(GCCause::_g1_humongous_allocation); |
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1039 } |
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1040 |
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1041 // We will loop until a) we manage to successfully perform the |
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1042 // allocation or b) we successfully schedule a collection which |
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1043 // fails to perform the allocation. b) is the only case when we'll |
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1044 // return NULL. |
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1045 HeapWord* result = NULL; |
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1046 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1047 bool should_try_gc; |
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1048 unsigned int gc_count_before; |
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1049 |
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1050 { |
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1051 MutexLockerEx x(Heap_lock); |
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1052 |
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1053 // Given that humongous objects are not allocated in young |
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1054 // regions, we'll first try to do the allocation without doing a |
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1055 // collection hoping that there's enough space in the heap. |
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1056 result = humongous_obj_allocate(word_size); |
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1057 if (result != NULL) { |
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1058 return result; |
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1059 } |
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1060 |
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1061 if (GC_locker::is_active_and_needs_gc()) { |
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1062 should_try_gc = false; |
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1063 } else { |
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1064 // Read the GC count while still holding the Heap_lock. |
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1065 gc_count_before = SharedHeap::heap()->total_collections(); |
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1066 should_try_gc = true; |
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1067 } |
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1068 } |
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1069 |
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1070 if (should_try_gc) { |
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1071 // If we failed to allocate the humongous object, we should try to |
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1072 // do a collection pause (if we're allowed) in case it reclaims |
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1073 // enough space for the allocation to succeed after the pause. |
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1074 |
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1075 bool succeeded; |
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1076 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1077 if (result != NULL) { |
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1078 assert(succeeded, "only way to get back a non-NULL result"); |
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1079 return result; |
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1080 } |
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1081 |
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1082 if (succeeded) { |
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1083 // If we get here we successfully scheduled a collection which |
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1084 // failed to allocate. No point in trying to allocate |
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1085 // further. We'll just return NULL. |
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1086 MutexLockerEx x(Heap_lock); |
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1087 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1088 return NULL; |
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1089 } |
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1090 } else { |
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1091 GC_locker::stall_until_clear(); |
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1092 } |
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1093 |
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1094 // We can reach here if we were unsuccessul in scheduling a |
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1095 // collection (because another thread beat us to it) or if we were |
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1096 // stalled due to the GC locker. In either can we should retry the |
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1097 // allocation attempt in case another thread successfully |
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1098 // performed a collection and reclaimed enough space. Give a |
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1099 // warning if we seem to be looping forever. |
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1100 |
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1101 if ((QueuedAllocationWarningCount > 0) && |
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1102 (try_count % QueuedAllocationWarningCount == 0)) { |
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1103 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1104 "retries %d times", try_count); |
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1105 } |
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1106 } |
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1107 |
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1108 ShouldNotReachHere(); |
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1109 return NULL; |
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1110 } |
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1111 |
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1112 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1113 bool expect_null_mutator_alloc_region) { |
2152 | 1114 assert_at_safepoint(true /* should_be_vm_thread */); |
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1115 assert(_mutator_alloc_region.get() == NULL || |
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1116 !expect_null_mutator_alloc_region, |
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1117 "the current alloc region was unexpectedly found to be non-NULL"); |
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1118 |
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1119 if (!isHumongous(word_size)) { |
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1120 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1121 false /* bot_updates */); |
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1122 } else { |
4829
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1123 HeapWord* result = humongous_obj_allocate(word_size); |
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1124 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
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1125 g1_policy()->set_initiate_conc_mark_if_possible(); |
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1126 } |
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1127 return result; |
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1128 } |
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1129 |
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1130 ShouldNotReachHere(); |
342 | 1131 } |
1132 | |
1133 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1134 ModRefBarrierSet* _mr_bs; | |
1135 public: | |
1136 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1137 bool doHeapRegion(HeapRegion* r) { | |
1138 r->reset_gc_time_stamp(); | |
1139 if (r->continuesHumongous()) | |
1140 return false; | |
1141 HeapRegionRemSet* hrrs = r->rem_set(); | |
1142 if (hrrs != NULL) hrrs->clear(); | |
1143 // You might think here that we could clear just the cards | |
1144 // corresponding to the used region. But no: if we leave a dirty card | |
1145 // in a region we might allocate into, then it would prevent that card | |
1146 // from being enqueued, and cause it to be missed. | |
1147 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1148 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1149 return false; | |
1150 } | |
1151 }; | |
1152 | |
1153 | |
1154 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1155 ModRefBarrierSet* _mr_bs; | |
1156 public: | |
1157 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1158 bool doHeapRegion(HeapRegion* r) { | |
1159 if (r->continuesHumongous()) return false; | |
1160 if (r->used_region().word_size() != 0) { | |
1161 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1162 } | |
1163 return false; | |
1164 } | |
1165 }; | |
1166 | |
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1167 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1168 G1CollectedHeap* _g1h; |
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1169 UpdateRSOopClosure _cl; |
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1170 int _worker_i; |
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1171 public: |
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1172 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1173 _cl(g1->g1_rem_set(), worker_i), |
626
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1174 _worker_i(worker_i), |
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1175 _g1h(g1) |
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1176 { } |
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1177 |
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1178 bool doHeapRegion(HeapRegion* r) { |
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1179 if (!r->continuesHumongous()) { |
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1180 _cl.set_from(r); |
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1181 r->oop_iterate(&_cl); |
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1182 } |
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1183 return false; |
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1184 } |
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1185 }; |
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1186 |
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1187 class ParRebuildRSTask: public AbstractGangTask { |
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1188 G1CollectedHeap* _g1; |
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1189 public: |
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1190 ParRebuildRSTask(G1CollectedHeap* g1) |
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1191 : AbstractGangTask("ParRebuildRSTask"), |
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1192 _g1(g1) |
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1193 { } |
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1194 |
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1195 void work(uint worker_id) { |
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1196 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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1197 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
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1198 _g1->workers()->active_workers(), |
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1199 HeapRegion::RebuildRSClaimValue); |
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1200 } |
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1201 }; |
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1202 |
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1203 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1204 private: |
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1205 G1HRPrinter* _hr_printer; |
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1206 public: |
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1207 bool doHeapRegion(HeapRegion* hr) { |
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1208 assert(!hr->is_young(), "not expecting to find young regions"); |
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1209 // We only generate output for non-empty regions. |
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1210 if (!hr->is_empty()) { |
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1211 if (!hr->isHumongous()) { |
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1212 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1213 } else if (hr->startsHumongous()) { |
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1214 if (hr->capacity() == HeapRegion::GrainBytes) { |
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1215 // single humongous region |
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1216 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1217 } else { |
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1218 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1219 } |
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1220 } else { |
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1221 assert(hr->continuesHumongous(), "only way to get here"); |
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1222 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1223 } |
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1224 } |
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1225 return false; |
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1226 } |
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1227 |
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1228 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1229 : _hr_printer(hr_printer) { } |
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1230 }; |
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1231 |
1973 | 1232 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1233 bool clear_all_soft_refs, |
342 | 1234 size_t word_size) { |
2152 | 1235 assert_at_safepoint(true /* should_be_vm_thread */); |
1236 | |
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1237 if (GC_locker::check_active_before_gc()) { |
1973 | 1238 return false; |
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1239 } |
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1240 |
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1241 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1242 ResourceMark rm; |
1243 | |
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1244 if (PrintHeapAtGC) { |
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1245 Universe::print_heap_before_gc(); |
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1246 } |
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1247 |
4072 | 1248 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1249 verify_region_sets_optional(); |
342 | 1250 |
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1251 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1252 collector_policy()->should_clear_all_soft_refs(); |
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1253 |
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1254 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1255 |
342 | 1256 { |
1257 IsGCActiveMark x; | |
1258 | |
1259 // Timing | |
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1260 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1261 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1262 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1263 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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1264 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1265 PrintGC, true, gclog_or_tty); |
342 | 1266 |
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1267 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
3356
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1268 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1269 |
342 | 1270 double start = os::elapsedTime(); |
1271 g1_policy()->record_full_collection_start(); | |
1272 | |
2152 | 1273 wait_while_free_regions_coming(); |
2361 | 1274 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1275 |
342 | 1276 gc_prologue(true); |
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1277 increment_total_collections(true /* full gc */); |
342 | 1278 |
1279 size_t g1h_prev_used = used(); | |
1280 assert(used() == recalculate_used(), "Should be equal"); | |
1281 | |
1282 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1283 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1284 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1285 prepare_for_verify(); |
3772
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1286 Universe::verify(/* allow dirty */ true, |
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1287 /* silent */ false, |
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1288 /* option */ VerifyOption_G1UsePrevMarking); |
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1289 |
342 | 1290 } |
3869
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1291 pre_full_gc_dump(); |
342 | 1292 |
1293 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1294 | |
3979
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1295 // Disable discovery and empty the discovered lists |
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1296 // for the CM ref processor. |
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1297 ref_processor_cm()->disable_discovery(); |
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1298 ref_processor_cm()->abandon_partial_discovery(); |
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1299 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1300 |
1301 // Abandon current iterations of concurrent marking and concurrent | |
1302 // refinement, if any are in progress. | |
1303 concurrent_mark()->abort(); | |
1304 | |
1305 // Make sure we'll choose a new allocation region afterwards. | |
2433
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1306 release_mutator_alloc_region(); |
636 | 1307 abandon_gc_alloc_regions(); |
1861 | 1308 g1_rem_set()->cleanupHRRS(); |
1394
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1309 |
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1310 // We should call this after we retire any currently active alloc |
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1311 // regions so that all the ALLOC / RETIRE events are generated |
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1312 // before the start GC event. |
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1313 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1314 |
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1315 // We may have added regions to the current incremental collection |
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1316 // set between the last GC or pause and now. We need to clear the |
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1317 // incremental collection set and then start rebuilding it afresh |
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1318 // after this full GC. |
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1319 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1320 g1_policy()->clear_incremental_cset(); |
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1321 g1_policy()->stop_incremental_cset_building(); |
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1322 |
4072 | 1323 tear_down_region_sets(false /* free_list_only */); |
4710 | 1324 g1_policy()->set_gcs_are_young(true); |
342 | 1325 |
3979
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1326 // See the comments in g1CollectedHeap.hpp and |
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|
1327 // G1CollectedHeap::ref_processing_init() about |
1974
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1328 // how reference processing currently works in G1. |
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|
1329 |
3979
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1330 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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1331 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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1332 |
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|
1333 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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1334 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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|
1335 |
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1336 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1337 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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1338 |
342 | 1339 // Do collection work |
1340 { | |
1341 HandleMark hm; // Discard invalid handles created during gc | |
3979
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|
1342 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1343 } |
3979
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|
1344 |
2152 | 1345 assert(free_regions() == 0, "we should not have added any free regions"); |
4072 | 1346 rebuild_region_sets(false /* free_list_only */); |
342 | 1347 |
3979
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1348 // Enqueue any discovered reference objects that have |
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|
1349 // not been removed from the discovered lists. |
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|
1350 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1351 |
1352 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1353 | |
1089
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|
1354 MemoryService::track_memory_usage(); |
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|
1355 |
342 | 1356 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1357 HandleMark hm; // Discard invalid handles created during verification | |
1358 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
25e146966e7c
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|
1359 prepare_for_verify(); |
3772
6747fd0512e0
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|
1360 Universe::verify(/* allow dirty */ false, |
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|
1361 /* silent */ false, |
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|
1362 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1363 |
342 | 1364 } |
3979
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|
1365 |
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|
1366 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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|
1367 ref_processor_stw()->verify_no_references_recorded(); |
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|
1368 |
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|
1369 // Note: since we've just done a full GC, concurrent |
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|
1370 // marking is no longer active. Therefore we need not |
4dfb2df418f2
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|
1371 // re-enable reference discovery for the CM ref processor. |
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|
1372 // That will be done at the start of the next marking cycle. |
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|
1373 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1374 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1375 |
1376 reset_gc_time_stamp(); | |
1377 // Since everything potentially moved, we will clear all remembered | |
626
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|
1378 // sets, and clear all cards. Later we will rebuild remebered |
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|
1379 // sets. We will also reset the GC time stamps of the regions. |
342 | 1380 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1381 heap_region_iterate(&rs_clear); | |
1382 | |
1383 // Resize the heap if necessary. | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
1384 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1385 |
3778
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|
1386 if (_hr_printer.is_active()) { |
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|
1387 // We should do this after we potentially resize the heap so |
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|
1388 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1389 // the end GC event. |
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|
1390 |
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|
1391 PostCompactionPrinterClosure cl(hr_printer()); |
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|
1392 heap_region_iterate(&cl); |
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|
1393 |
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|
1394 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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|
1395 } |
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|
1396 |
342 | 1397 if (_cg1r->use_cache()) { |
1398 _cg1r->clear_and_record_card_counts(); | |
1399 _cg1r->clear_hot_cache(); | |
1400 } | |
1401 | |
626
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|
1402 // Rebuild remembered sets of all regions. |
1833
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6984287: Regularize how GC parallel workers are specified.
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diff
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|
1403 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4728
441e946dc1af
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|
1404 uint n_workers = |
4095
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|
1405 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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|
1406 workers()->active_workers(), |
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|
1407 Threads::number_of_non_daemon_threads()); |
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|
1408 assert(UseDynamicNumberOfGCThreads || |
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|
1409 n_workers == workers()->total_workers(), |
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|
1410 "If not dynamic should be using all the workers"); |
bca17e38de00
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|
1411 workers()->set_active_workers(n_workers); |
bca17e38de00
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|
1412 // Set parallel threads in the heap (_n_par_threads) only |
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|
1413 // before a parallel phase and always reset it to 0 after |
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|
1414 // the phase so that the number of parallel threads does |
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|
1415 // no get carried forward to a serial phase where there |
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|
1416 // may be code that is "possibly_parallel". |
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|
1417 set_par_threads(n_workers); |
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|
1418 |
626
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|
1419 ParRebuildRSTask rebuild_rs_task(this); |
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|
1420 assert(check_heap_region_claim_values( |
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|
1421 HeapRegion::InitialClaimValue), "sanity check"); |
4095
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|
1422 assert(UseDynamicNumberOfGCThreads || |
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|
1423 workers()->active_workers() == workers()->total_workers(), |
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|
1424 "Unless dynamic should use total workers"); |
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|
1425 // Use the most recent number of active workers |
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|
1426 assert(workers()->active_workers() > 0, |
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|
1427 "Active workers not properly set"); |
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|
1428 set_par_threads(workers()->active_workers()); |
626
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|
1429 workers()->run_task(&rebuild_rs_task); |
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|
1430 set_par_threads(0); |
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|
1431 assert(check_heap_region_claim_values( |
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|
1432 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1433 reset_heap_region_claim_values(); |
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|
1434 } else { |
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|
1435 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1436 heap_region_iterate(&rebuild_rs); |
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|
1437 } |
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|
1438 |
342 | 1439 if (PrintGC) { |
1440 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1441 } | |
1442 | |
1443 if (true) { // FIXME | |
1444 // Ask the permanent generation to adjust size for full collections | |
1445 perm()->compute_new_size(); | |
1446 } | |
1447 | |
1394
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|
1448 // Start a new incremental collection set for the next pause |
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|
1449 assert(g1_policy()->collection_set() == NULL, "must be"); |
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|
1450 g1_policy()->start_incremental_cset_building(); |
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|
1451 |
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|
1452 // Clear the _cset_fast_test bitmap in anticipation of adding |
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|
1453 // regions to the incremental collection set for the next |
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diff
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|
1454 // evacuation pause. |
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|
1455 clear_cset_fast_test(); |
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|
1456 |
2433
abdfc822206f
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diff
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|
1457 init_mutator_alloc_region(); |
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|
1458 |
342 | 1459 double end = os::elapsedTime(); |
1460 g1_policy()->record_full_collection_end(); | |
1461 | |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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545
diff
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|
1462 #ifdef TRACESPINNING |
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6690928: Use spinning in combination with yields for workstealing termination.
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545
diff
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|
1463 ParallelTaskTerminator::print_termination_counts(); |
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diff
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|
1464 #endif |
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|
1465 |
342 | 1466 gc_epilogue(true); |
1467 | |
794 | 1468 // Discard all rset updates |
1469 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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595
diff
changeset
|
1470 assert(!G1DeferredRSUpdate |
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diff
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|
1471 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1472 } |
1473 | |
3867
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|
1474 _young_list->reset_sampled_info(); |
ff53346271fe
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|
1475 // At this point there should be no regions in the |
ff53346271fe
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|
1476 // entire heap tagged as young. |
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1477 assert( check_young_list_empty(true /* check_heap */), |
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1478 "young list should be empty at this point"); |
838
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1479 |
1656
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1480 // Update the number of full collections that have been completed. |
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1481 increment_full_collections_completed(false /* concurrent */); |
1656
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1482 |
3766 | 1483 _hrs.verify_optional(); |
2152 | 1484 verify_region_sets_optional(); |
1485 | |
838
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1486 if (PrintHeapAtGC) { |
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1487 Universe::print_heap_after_gc(); |
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1488 } |
3980
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1489 g1mm()->update_sizes(); |
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1490 post_full_gc_dump(); |
1973 | 1491 |
1492 return true; | |
342 | 1493 } |
1494 | |
1495 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1496 // do_collection() will return whether it succeeded in performing |
1497 // the GC. Currently, there is no facility on the | |
1498 // do_full_collection() API to notify the caller than the collection | |
1499 // did not succeed (e.g., because it was locked out by the GC | |
1500 // locker). So, right now, we'll ignore the return value. | |
1501 bool dummy = do_collection(true, /* explicit_gc */ | |
1502 clear_all_soft_refs, | |
1503 0 /* word_size */); | |
342 | 1504 } |
1505 | |
1506 // This code is mostly copied from TenuredGeneration. | |
1507 void | |
1508 G1CollectedHeap:: | |
1509 resize_if_necessary_after_full_collection(size_t word_size) { | |
1510 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1511 | |
1512 // Include the current allocation, if any, and bytes that will be | |
1513 // pre-allocated to support collections, as "used". | |
1514 const size_t used_after_gc = used(); | |
1515 const size_t capacity_after_gc = capacity(); | |
1516 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1517 | |
1717
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1518 // This is enforced in arguments.cpp. |
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1519 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1520 "otherwise the code below doesn't make sense"); |
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1521 |
342 | 1522 // We don't have floating point command-line arguments |
1717
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1523 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1524 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1525 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1526 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1527 | |
1717
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1528 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1529 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1530 |
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1531 // We have to be careful here as these two calculations can overflow |
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1532 // 32-bit size_t's. |
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1533 double used_after_gc_d = (double) used_after_gc; |
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1534 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1535 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1536 |
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1537 // Let's make sure that they are both under the max heap size, which |
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1538 // by default will make them fit into a size_t. |
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1539 double desired_capacity_upper_bound = (double) max_heap_size; |
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1540 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1541 desired_capacity_upper_bound); |
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1542 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1543 desired_capacity_upper_bound); |
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1544 |
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1545 // We can now safely turn them into size_t's. |
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1546 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1547 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1548 |
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1549 // This assert only makes sense here, before we adjust them |
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1550 // with respect to the min and max heap size. |
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1551 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1552 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1553 "maximum_desired_capacity = "SIZE_FORMAT, |
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1554 minimum_desired_capacity, maximum_desired_capacity)); |
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1555 |
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1556 // Should not be greater than the heap max size. No need to adjust |
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1557 // it with respect to the heap min size as it's a lower bound (i.e., |
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1558 // we'll try to make the capacity larger than it, not smaller). |
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1559 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1560 // Should not be less than the heap min size. No need to adjust it |
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1561 // with respect to the heap max size as it's an upper bound (i.e., |
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1562 // we'll try to make the capacity smaller than it, not greater). |
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1563 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1564 |
1717
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1565 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1566 // Don't expand unless it's significant |
1567 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1568 ergo_verbose4(ErgoHeapSizing, |
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1569 "attempt heap expansion", |
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1570 ergo_format_reason("capacity lower than " |
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1571 "min 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("min desired capacity"), |
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1575 capacity_after_gc, used_after_gc, |
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1576 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1577 expand(expand_bytes); |
342 | 1578 |
1579 // No expansion, now see if we want to shrink | |
1717
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1580 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1581 // Capacity too large, compute shrinking size |
1582 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
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1583 ergo_verbose4(ErgoHeapSizing, |
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1584 "attempt heap shrinking", |
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1585 ergo_format_reason("capacity higher than " |
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1586 "max desired capacity after Full GC") |
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1587 ergo_format_byte("capacity") |
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1588 ergo_format_byte("occupancy") |
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1589 ergo_format_byte_perc("max desired capacity"), |
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1590 capacity_after_gc, used_after_gc, |
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1591 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1592 shrink(shrink_bytes); |
1593 } | |
1594 } | |
1595 | |
1596 | |
1597 HeapWord* | |
1973 | 1598 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1599 bool* succeeded) { | |
2152 | 1600 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1601 |
1602 *succeeded = true; | |
1603 // Let's attempt the allocation first. | |
2433
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1604 HeapWord* result = |
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1605 attempt_allocation_at_safepoint(word_size, |
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1606 false /* expect_null_mutator_alloc_region */); |
1973 | 1607 if (result != NULL) { |
1608 assert(*succeeded, "sanity"); | |
1609 return result; | |
1610 } | |
342 | 1611 |
1612 // In a G1 heap, we're supposed to keep allocation from failing by | |
1613 // incremental pauses. Therefore, at least for now, we'll favor | |
1614 // expansion over collection. (This might change in the future if we can | |
1615 // do something smarter than full collection to satisfy a failed alloc.) | |
1616 result = expand_and_allocate(word_size); | |
1617 if (result != NULL) { | |
1973 | 1618 assert(*succeeded, "sanity"); |
342 | 1619 return result; |
1620 } | |
1621 | |
1973 | 1622 // Expansion didn't work, we'll try to do a Full GC. |
1623 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1624 false, /* clear_all_soft_refs */ | |
1625 word_size); | |
1626 if (!gc_succeeded) { | |
1627 *succeeded = false; | |
1628 return NULL; | |
1629 } | |
1630 | |
1631 // Retry the allocation | |
1632 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1633 true /* expect_null_mutator_alloc_region */); |
342 | 1634 if (result != NULL) { |
1973 | 1635 assert(*succeeded, "sanity"); |
342 | 1636 return result; |
1637 } | |
1638 | |
1973 | 1639 // Then, try a Full GC that will collect all soft references. |
1640 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1641 true, /* clear_all_soft_refs */ | |
1642 word_size); | |
1643 if (!gc_succeeded) { | |
1644 *succeeded = false; | |
1645 return NULL; | |
1646 } | |
1647 | |
1648 // Retry the allocation once more | |
1649 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1650 true /* expect_null_mutator_alloc_region */); |
342 | 1651 if (result != NULL) { |
1973 | 1652 assert(*succeeded, "sanity"); |
342 | 1653 return result; |
1654 } | |
1655 | |
1387
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1656 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1657 "Flag should have been handled and cleared prior to this point"); |
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1658 |
342 | 1659 // What else? We might try synchronous finalization later. If the total |
1660 // space available is large enough for the allocation, then a more | |
1661 // complete compaction phase than we've tried so far might be | |
1662 // appropriate. | |
1973 | 1663 assert(*succeeded, "sanity"); |
342 | 1664 return NULL; |
1665 } | |
1666 | |
1667 // Attempting to expand the heap sufficiently | |
1668 // to support an allocation of the given "word_size". If | |
1669 // successful, perform the allocation and return the address of the | |
1670 // allocated block, or else "NULL". | |
1671 | |
1672 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1673 assert_at_safepoint(true /* should_be_vm_thread */); |
1674 | |
1675 verify_region_sets_optional(); | |
1973 | 1676 |
2188
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1677 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1678 ergo_verbose1(ErgoHeapSizing, |
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1679 "attempt heap expansion", |
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1680 ergo_format_reason("allocation request failed") |
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1681 ergo_format_byte("allocation request"), |
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1682 word_size * HeapWordSize); |
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1683 if (expand(expand_bytes)) { |
3766 | 1684 _hrs.verify_optional(); |
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1685 verify_region_sets_optional(); |
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1686 return attempt_allocation_at_safepoint(word_size, |
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1687 false /* expect_null_mutator_alloc_region */); |
2188
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1688 } |
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1689 return NULL; |
342 | 1690 } |
1691 | |
3766 | 1692 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1693 HeapWord* new_end) { | |
1694 assert(old_end != new_end, "don't call this otherwise"); | |
1695 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1696 | |
1697 // Update the committed mem region. | |
1698 _g1_committed.set_end(new_end); | |
1699 // Tell the card table about the update. | |
1700 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1701 // Tell the BOT about the update. | |
1702 _bot_shared->resize(_g1_committed.word_size()); | |
1703 } | |
1704 | |
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1705 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1706 size_t old_mem_size = _g1_storage.committed_size(); |
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1707 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1708 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1709 HeapRegion::GrainBytes); | |
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1710 ergo_verbose2(ErgoHeapSizing, |
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1711 "expand the heap", |
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1712 ergo_format_byte("requested expansion amount") |
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1713 ergo_format_byte("attempted expansion amount"), |
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1714 expand_bytes, aligned_expand_bytes); |
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1715 |
3766 | 1716 // First commit the memory. |
1717 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1718 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1719 if (successful) { |
3766 | 1720 // Then propagate this update to the necessary data structures. |
1721 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1722 update_committed_space(old_end, new_end); | |
1723 | |
1724 FreeRegionList expansion_list("Local Expansion List"); | |
1725 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1726 assert(mr.start() == old_end, "post-condition"); | |
1727 // mr might be a smaller region than what was requested if | |
1728 // expand_by() was unable to allocate the HeapRegion instances | |
1729 assert(mr.end() <= new_end, "post-condition"); | |
1730 | |
1731 size_t actual_expand_bytes = mr.byte_size(); | |
1732 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1733 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1734 "post-condition"); | |
1735 if (actual_expand_bytes < aligned_expand_bytes) { | |
1736 // We could not expand _hrs to the desired size. In this case we | |
1737 // need to shrink the committed space accordingly. | |
1738 assert(mr.end() < new_end, "invariant"); | |
1739 | |
1740 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1741 // First uncommit the memory. | |
1742 _g1_storage.shrink_by(diff_bytes); | |
1743 // Then propagate this update to the necessary data structures. | |
1744 update_committed_space(new_end, mr.end()); | |
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1745 } |
3766 | 1746 _free_list.add_as_tail(&expansion_list); |
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1747 |
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1748 if (_hr_printer.is_active()) { |
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1749 HeapWord* curr = mr.start(); |
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1750 while (curr < mr.end()) { |
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1751 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1752 _hr_printer.commit(curr, curr_end); |
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1753 curr = curr_end; |
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1754 } |
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1755 assert(curr == mr.end(), "post-condition"); |
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1756 } |
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1757 g1_policy()->record_new_heap_size(n_regions()); |
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1758 } else { |
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1759 ergo_verbose0(ErgoHeapSizing, |
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1760 "did not expand the heap", |
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1761 ergo_format_reason("heap expansion operation failed")); |
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1762 // The expansion of the virtual storage space was unsuccessful. |
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1763 // Let's see if it was because we ran out of swap. |
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1764 if (G1ExitOnExpansionFailure && |
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1765 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1766 // We had head room... |
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1767 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1768 } |
1769 } | |
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1770 return successful; |
342 | 1771 } |
1772 | |
3766 | 1773 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1774 size_t old_mem_size = _g1_storage.committed_size(); |
1775 size_t aligned_shrink_bytes = | |
1776 ReservedSpace::page_align_size_down(shrink_bytes); | |
1777 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1778 HeapRegion::GrainBytes); | |
1779 size_t num_regions_deleted = 0; | |
3766 | 1780 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1781 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1782 assert(mr.end() == old_end, "post-condition"); | |
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1783 |
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1784 ergo_verbose3(ErgoHeapSizing, |
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1785 "shrink the heap", |
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1786 ergo_format_byte("requested shrinking amount") |
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1787 ergo_format_byte("aligned shrinking amount") |
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1788 ergo_format_byte("attempted shrinking amount"), |
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1789 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1790 if (mr.byte_size() > 0) { |
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1791 if (_hr_printer.is_active()) { |
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1792 HeapWord* curr = mr.end(); |
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1793 while (curr > mr.start()) { |
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1794 HeapWord* curr_end = curr; |
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1795 curr -= HeapRegion::GrainWords; |
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1796 _hr_printer.uncommit(curr, curr_end); |
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1797 } |
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1798 assert(curr == mr.start(), "post-condition"); |
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1799 } |
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1800 |
342 | 1801 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1802 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1803 assert(mr.start() == new_end, "post-condition"); | |
1804 | |
1805 _expansion_regions += num_regions_deleted; | |
1806 update_committed_space(old_end, new_end); | |
1807 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1808 g1_policy()->record_new_heap_size(n_regions()); |
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1809 } else { |
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1810 ergo_verbose0(ErgoHeapSizing, |
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1811 "did not shrink the heap", |
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1812 ergo_format_reason("heap shrinking operation failed")); |
342 | 1813 } |
1814 } | |
1815 | |
1816 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1817 verify_region_sets_optional(); |
1818 | |
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1819 // We should only reach here at the end of a Full GC which means we |
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1820 // should not not be holding to any GC alloc regions. The method |
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1821 // below will make sure of that and do any remaining clean up. |
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1822 abandon_gc_alloc_regions(); |
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1823 |
2152 | 1824 // Instead of tearing down / rebuilding the free lists here, we |
1825 // could instead use the remove_all_pending() method on free_list to | |
1826 // remove only the ones that we need to remove. | |
4072 | 1827 tear_down_region_sets(true /* free_list_only */); |
342 | 1828 shrink_helper(shrink_bytes); |
4072 | 1829 rebuild_region_sets(true /* free_list_only */); |
2152 | 1830 |
3766 | 1831 _hrs.verify_optional(); |
2152 | 1832 verify_region_sets_optional(); |
342 | 1833 } |
1834 | |
1835 // Public methods. | |
1836 | |
1837 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1838 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1839 #endif // _MSC_VER | |
1840 | |
1841 | |
1842 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1843 SharedHeap(policy_), | |
1844 _g1_policy(policy_), | |
1111 | 1845 _dirty_card_queue_set(false), |
1705 | 1846 _into_cset_dirty_card_queue_set(false), |
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1847 _is_alive_closure_cm(this), |
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1848 _is_alive_closure_stw(this), |
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1849 _ref_processor_cm(NULL), |
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1850 _ref_processor_stw(NULL), |
342 | 1851 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1852 _bot_shared(NULL), | |
1853 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1854 _evac_failure_scan_stack(NULL) , | |
1855 _mark_in_progress(false), | |
2152 | 1856 _cg1r(NULL), _summary_bytes_used(0), |
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1857 _g1mm(NULL), |
342 | 1858 _refine_cte_cl(NULL), |
1859 _full_collection(false), | |
2152 | 1860 _free_list("Master Free List"), |
1861 _secondary_free_list("Secondary Free List"), | |
4072 | 1862 _old_set("Old Set"), |
2152 | 1863 _humongous_set("Master Humongous Set"), |
1864 _free_regions_coming(false), | |
342 | 1865 _young_list(new YoungList(this)), |
1866 _gc_time_stamp(0), | |
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1867 _retained_old_gc_alloc_region(NULL), |
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1868 _expand_heap_after_alloc_failure(true), |
526 | 1869 _surviving_young_words(NULL), |
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1870 _full_collections_completed(0), |
526 | 1871 _in_cset_fast_test(NULL), |
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1872 _in_cset_fast_test_base(NULL), |
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1873 _dirty_cards_region_list(NULL), |
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1874 _worker_cset_start_region(NULL), |
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1875 _worker_cset_start_region_time_stamp(NULL) { |
342 | 1876 _g1h = this; // To catch bugs. |
1877 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1878 vm_exit_during_initialization("Failed necessary allocation."); | |
1879 } | |
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1880 |
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1881 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1882 |
342 | 1883 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1884 _task_queues = new RefToScanQueueSet(n_queues); | |
1885 | |
1886 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1887 assert(n_rem_sets > 0, "Invariant."); | |
1888 | |
1889 HeapRegionRemSetIterator** iter_arr = | |
1890 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1891 for (int i = 0; i < n_queues; i++) { | |
1892 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1893 } | |
1894 _rem_set_iterator = iter_arr; | |
1895 | |
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1896 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1897 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1898 |
342 | 1899 for (int i = 0; i < n_queues; i++) { |
1900 RefToScanQueue* q = new RefToScanQueue(); | |
1901 q->initialize(); | |
1902 _task_queues->register_queue(i, q); | |
1903 } | |
1904 | |
4709
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1905 clear_cset_start_regions(); |
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1906 |
342 | 1907 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1908 } | |
1909 | |
1910 jint G1CollectedHeap::initialize() { | |
1166 | 1911 CollectedHeap::pre_initialize(); |
342 | 1912 os::enable_vtime(); |
1913 | |
1914 // Necessary to satisfy locking discipline assertions. | |
1915 | |
1916 MutexLocker x(Heap_lock); | |
1917 | |
3778
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1918 // We have to initialize the printer before committing the heap, as |
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1919 // it will be used then. |
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1920 _hr_printer.set_active(G1PrintHeapRegions); |
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1921 |
342 | 1922 // While there are no constraints in the GC code that HeapWordSize |
1923 // be any particular value, there are multiple other areas in the | |
1924 // system which believe this to be true (e.g. oop->object_size in some | |
1925 // cases incorrectly returns the size in wordSize units rather than | |
1926 // HeapWordSize). | |
1927 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1928 | |
1929 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1930 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1931 | |
1932 // Ensure that the sizes are properly aligned. | |
1933 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1934 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1935 | |
1936 _cg1r = new ConcurrentG1Refine(); | |
1937 | |
1938 // Reserve the maximum. | |
1939 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1940 // Includes the perm-gen. | |
642
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1941 |
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1942 // When compressed oops are enabled, the preferred heap base |
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1943 // is calculated by subtracting the requested size from the |
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1944 // 32Gb boundary and using the result as the base address for |
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1945 // heap reservation. If the requested size is not aligned to |
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1946 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1947 // into the ReservedHeapSpace constructor) then the actual |
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1948 // base of the reserved heap may end up differing from the |
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1949 // address that was requested (i.e. the preferred heap base). |
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1950 // If this happens then we could end up using a non-optimal |
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1951 // compressed oops mode. |
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1952 |
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1953 // Since max_byte_size is aligned to the size of a heap region (checked |
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1954 // above), we also need to align the perm gen size as it might not be. |
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1955 const size_t total_reserved = max_byte_size + |
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1956 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1957 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1958 |
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1959 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1960 |
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1961 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1962 UseLargePages, addr); |
642
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1963 |
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1964 if (UseCompressedOops) { |
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1965 if (addr != NULL && !heap_rs.is_reserved()) { |
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1966 // Failed to reserve at specified address - the requested memory |
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1967 // region is taken already, for example, by 'java' launcher. |
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1968 // Try again to reserver heap higher. |
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1969 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1970 |
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1971 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1972 UseLargePages, addr); |
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1973 |
642
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1974 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1975 // Failed to reserve at specified address again - give up. |
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1976 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1977 assert(addr == NULL, ""); |
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1978 |
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1979 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1980 UseLargePages, addr); |
642
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1981 heap_rs = heap_rs1; |
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1982 } else { |
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1983 heap_rs = heap_rs0; |
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1984 } |
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1985 } |
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1986 } |
342 | 1987 |
1988 if (!heap_rs.is_reserved()) { | |
1989 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1990 return JNI_ENOMEM; | |
1991 } | |
1992 | |
1993 // It is important to do this in a way such that concurrent readers can't | |
1994 // temporarily think somethings in the heap. (I've actually seen this | |
1995 // happen in asserts: DLD.) | |
1996 _reserved.set_word_size(0); | |
1997 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1998 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1999 | |
2000 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
2001 | |
2002 // Create the gen rem set (and barrier set) for the entire reserved region. | |
2003 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
2004 set_barrier_set(rem_set()->bs()); | |
2005 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
2006 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
2007 } else { | |
2008 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
2009 return JNI_ENOMEM; | |
2010 } | |
2011 | |
2012 // Also create a G1 rem set. | |
1861 | 2013 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
2014 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 2015 } else { |
1861 | 2016 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
2017 return JNI_ENOMEM; | |
342 | 2018 } |
2019 | |
2020 // Carve out the G1 part of the heap. | |
2021 | |
2022 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2023 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2024 g1_rs.size()/HeapWordSize); | |
2025 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
2026 | |
2027 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
2028 | |
2029 _g1_storage.initialize(g1_rs, 0); | |
2030 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2031 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
2032 (HeapWord*) _g1_reserved.end(), | |
2033 _expansion_regions); | |
342 | 2034 |
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2035 // 6843694 - ensure that the maximum region index can fit |
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2036 // in the remembered set structures. |
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2037 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2038 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2039 |
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2040 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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2041 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
3986
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2042 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
942
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2043 "too many cards per region"); |
807
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2044 |
2152 | 2045 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2046 | |
342 | 2047 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2048 heap_word_size(init_byte_size)); | |
2049 | |
2050 _g1h = this; | |
2051 | |
1394
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2052 _in_cset_fast_test_length = max_regions(); |
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2053 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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2054 |
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2055 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2056 // beginning of the heap every time we want to index; basically |
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2057 // it's the same with what we do with the card table. |
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2058 _in_cset_fast_test = _in_cset_fast_test_base - |
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2059 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2060 |
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2061 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2062 // regions to the incremental collection set for the first |
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2063 // evacuation pause. |
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2064 clear_cset_fast_test(); |
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2065 |
342 | 2066 // Create the ConcurrentMark data structure and thread. |
2067 // (Must do this late, so that "max_regions" is defined.) | |
2068 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2069 _cmThread = _cm->cmThread(); | |
2070 | |
2071 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2072 HeapRegionRemSet::init_heap(max_regions()); | |
2073 | |
677 | 2074 // Now expand into the initial heap size. |
2188
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2075 if (!expand(init_byte_size)) { |
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2076 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2077 return JNI_ENOMEM; |
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2078 } |
342 | 2079 |
2080 // Perform any initialization actions delegated to the policy. | |
2081 g1_policy()->init(); | |
2082 | |
2083 _refine_cte_cl = | |
2084 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2085 g1_rem_set(), | |
2086 concurrent_g1_refine()); | |
2087 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2088 | |
2089 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2090 SATB_Q_FL_lock, | |
1111 | 2091 G1SATBProcessCompletedThreshold, |
342 | 2092 Shared_SATB_Q_lock); |
794 | 2093 |
2094 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2095 DirtyCardQ_FL_lock, | |
1111 | 2096 concurrent_g1_refine()->yellow_zone(), |
2097 concurrent_g1_refine()->red_zone(), | |
794 | 2098 Shared_DirtyCardQ_lock); |
2099 | |
616
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2100 if (G1DeferredRSUpdate) { |
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2101 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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2102 DirtyCardQ_FL_lock, |
1111 | 2103 -1, // never trigger processing |
2104 -1, // no limit on length | |
616
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2105 Shared_DirtyCardQ_lock, |
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2106 &JavaThread::dirty_card_queue_set()); |
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2107 } |
1705 | 2108 |
2109 // Initialize the card queue set used to hold cards containing | |
2110 // references into the collection set. | |
2111 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2112 DirtyCardQ_FL_lock, | |
2113 -1, // never trigger processing | |
2114 -1, // no limit on length | |
2115 Shared_DirtyCardQ_lock, | |
2116 &JavaThread::dirty_card_queue_set()); | |
2117 | |
342 | 2118 // In case we're keeping closure specialization stats, initialize those |
2119 // counts and that mechanism. | |
2120 SpecializationStats::clear(); | |
2121 | |
2122 // Do later initialization work for concurrent refinement. | |
2123 _cg1r->init(); | |
2124 | |
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2125 // Here we allocate the dummy full region that is required by the |
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2126 // G1AllocRegion class. If we don't pass an address in the reserved |
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2127 // space here, lots of asserts fire. |
3766 | 2128 |
2129 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2130 _g1_reserved.start()); | |
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2131 // We'll re-use the same region whether the alloc region will |
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2132 // require BOT updates or not and, if it doesn't, then a non-young |
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2133 // region will complain that it cannot support allocations without |
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2134 // BOT updates. So we'll tag the dummy region as young to avoid that. |
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2135 dummy_region->set_young(); |
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2136 // Make sure it's full. |
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2137 dummy_region->set_top(dummy_region->end()); |
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2138 G1AllocRegion::setup(this, dummy_region); |
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2139 |
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2140 init_mutator_alloc_region(); |
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2141 |
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2142 // Do create of the monitoring and management support so that |
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2143 // values in the heap have been properly initialized. |
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2144 _g1mm = new G1MonitoringSupport(this); |
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2145 |
342 | 2146 return JNI_OK; |
2147 } | |
2148 | |
2149 void G1CollectedHeap::ref_processing_init() { | |
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2150 // Reference processing in G1 currently works as follows: |
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2151 // |
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2152 // * There are two reference processor instances. One is |
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2153 // used to record and process discovered references |
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2154 // during concurrent marking; the other is used to |
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2155 // record and process references during STW pauses |
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2156 // (both full and incremental). |
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2157 // * Both ref processors need to 'span' the entire heap as |
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2158 // the regions in the collection set may be dotted around. |
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2159 // |
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2160 // * For the concurrent marking ref processor: |
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2161 // * Reference discovery is enabled at initial marking. |
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2162 // * Reference discovery is disabled and the discovered |
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2163 // references processed etc during remarking. |
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2164 // * Reference discovery is MT (see below). |
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2165 // * Reference discovery requires a barrier (see below). |
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2166 // * Reference processing may or may not be MT |
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2167 // (depending on the value of ParallelRefProcEnabled |
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2168 // and ParallelGCThreads). |
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2169 // * A full GC disables reference discovery by the CM |
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2170 // ref processor and abandons any entries on it's |
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2171 // discovered lists. |
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2172 // |
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2173 // * For the STW processor: |
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2174 // * Non MT discovery is enabled at the start of a full GC. |
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2175 // * Processing and enqueueing during a full GC is non-MT. |
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2176 // * During a full GC, references are processed after marking. |
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2177 // |
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2178 // * Discovery (may or may not be MT) is enabled at the start |
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2179 // of an incremental evacuation pause. |
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2180 // * References are processed near the end of a STW evacuation pause. |
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2181 // * For both types of GC: |
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2182 // * Discovery is atomic - i.e. not concurrent. |
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2183 // * Reference discovery will not need a barrier. |
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2184 |
342 | 2185 SharedHeap::ref_processing_init(); |
2186 MemRegion mr = reserved_region(); | |
3979
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2187 |
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2188 // Concurrent Mark ref processor |
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2189 _ref_processor_cm = |
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2190 new ReferenceProcessor(mr, // span |
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2191 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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2192 // mt processing |
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|
2193 (int) ParallelGCThreads, |
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2194 // degree of mt processing |
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|
2195 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
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|
2196 // mt discovery |
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|
2197 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
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|
2198 // degree of mt discovery |
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|
2199 false, |
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|
2200 // Reference discovery is not atomic |
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|
2201 &_is_alive_closure_cm, |
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|
2202 // is alive closure |
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|
2203 // (for efficiency/performance) |
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|
2204 true); |
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|
2205 // Setting next fields of discovered |
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|
2206 // lists requires a barrier. |
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|
2207 |
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|
2208 // STW ref processor |
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|
2209 _ref_processor_stw = |
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|
2210 new ReferenceProcessor(mr, // span |
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|
2211 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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|
2212 // mt processing |
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|
2213 MAX2((int)ParallelGCThreads, 1), |
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|
2214 // degree of mt processing |
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|
2215 (ParallelGCThreads > 1), |
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|
2216 // mt discovery |
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|
2217 MAX2((int)ParallelGCThreads, 1), |
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|
2218 // degree of mt discovery |
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|
2219 true, |
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|
2220 // Reference discovery is atomic |
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|
2221 &_is_alive_closure_stw, |
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|
2222 // is alive closure |
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|
2223 // (for efficiency/performance) |
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|
2224 false); |
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|
2225 // Setting next fields of discovered |
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|
2226 // lists requires a barrier. |
342 | 2227 } |
2228 | |
2229 size_t G1CollectedHeap::capacity() const { | |
2230 return _g1_committed.byte_size(); | |
2231 } | |
2232 | |
1705 | 2233 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2234 DirtyCardQueue* into_cset_dcq, | |
2235 bool concurrent, | |
342 | 2236 int worker_i) { |
889 | 2237 // Clean cards in the hot card cache |
1705 | 2238 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2239 |
342 | 2240 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2241 int n_completed_buffers = 0; | |
1705 | 2242 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2243 n_completed_buffers++; |
2244 } | |
2245 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2246 (double) n_completed_buffers); | |
2247 dcqs.clear_n_completed_buffers(); | |
2248 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2249 } | |
2250 | |
2251 | |
2252 // Computes the sum of the storage used by the various regions. | |
2253 | |
2254 size_t G1CollectedHeap::used() const { | |
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|
2255 assert(Heap_lock->owner() != NULL, |
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|
2256 "Should be owned on this thread's behalf."); |
342 | 2257 size_t result = _summary_bytes_used; |
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2258 // Read only once in case it is set to NULL concurrently |
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2259 HeapRegion* hr = _mutator_alloc_region.get(); |
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2260 if (hr != NULL) |
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2261 result += hr->used(); |
342 | 2262 return result; |
2263 } | |
2264 | |
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2265 size_t G1CollectedHeap::used_unlocked() const { |
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2266 size_t result = _summary_bytes_used; |
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2267 return result; |
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2268 } |
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2269 |
342 | 2270 class SumUsedClosure: public HeapRegionClosure { |
2271 size_t _used; | |
2272 public: | |
2273 SumUsedClosure() : _used(0) {} | |
2274 bool doHeapRegion(HeapRegion* r) { | |
2275 if (!r->continuesHumongous()) { | |
2276 _used += r->used(); | |
2277 } | |
2278 return false; | |
2279 } | |
2280 size_t result() { return _used; } | |
2281 }; | |
2282 | |
2283 size_t G1CollectedHeap::recalculate_used() const { | |
2284 SumUsedClosure blk; | |
3766 | 2285 heap_region_iterate(&blk); |
342 | 2286 return blk.result(); |
2287 } | |
2288 | |
2289 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2290 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2291 // otherwise, is there space in the current allocation region? |
2292 | |
2293 // We need to store the current allocation region in a local variable | |
2294 // here. The problem is that this method doesn't take any locks and | |
2295 // there may be other threads which overwrite the current allocation | |
2296 // region field. attempt_allocation(), for example, sets it to NULL | |
2297 // and this can happen *after* the NULL check here but before the call | |
2298 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2299 // to be a problem in the optimized build, since the two loads of the | |
2300 // current allocation region field are optimized away. | |
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2301 HeapRegion* hr = _mutator_alloc_region.get(); |
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2302 if (hr == NULL) { |
342 | 2303 return 0; |
2304 } | |
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2305 return hr->free(); |
342 | 2306 } |
2307 | |
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|
2308 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
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parents:
1611
diff
changeset
|
2309 return |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2310 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4829
9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
parents:
4787
diff
changeset
|
2311 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent) || |
9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
brutisso
parents:
4787
diff
changeset
|
2312 cause == GCCause::_g1_humongous_allocation); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2313 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2314 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2315 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2316 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2317 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2318 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2319 // And as a result the region we'll allocate will be humongous. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2320 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2321 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2322 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2323 // Let's use the existing mechanism for the allocation |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2324 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2325 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2326 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2327 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2328 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2329 // If we can't allocate once, we probably cannot allocate |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2330 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2331 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2332 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2333 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2334 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2335 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2336 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2337 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2338 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2339 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2340 // We assume that if concurrent == true, then the caller is a |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2341 // concurrent thread that was joined the Suspendible Thread |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2342 // Set. If there's ever a cheap way to check this, we should add an |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2343 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2344 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2345 // We have already incremented _total_full_collections at the start |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2346 // of the GC, so total_full_collections() represents how many full |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2347 // collections have been started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2348 unsigned int full_collections_started = total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2349 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2350 // Given that this method is called at the end of a Full GC or of a |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2351 // concurrent cycle, and those can be nested (i.e., a Full GC can |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2352 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2353 // completed should be either one (in the case where there was no |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2354 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2355 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2356 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2357 // This is the case for the inner caller, i.e. a Full GC. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2358 assert(concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2359 (full_collections_started == _full_collections_completed + 1) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2360 (full_collections_started == _full_collections_completed + 2), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2361 err_msg("for inner caller (Full GC): full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2362 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2363 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2364 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2365 // This is the case for the outer caller, i.e. the concurrent cycle. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2366 assert(!concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2367 (full_collections_started == _full_collections_completed + 1), |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2368 err_msg("for outer caller (concurrent cycle): " |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2369 "full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2370 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2371 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2372 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2373 _full_collections_completed += 1; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2374 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2375 // We need to clear the "in_progress" flag in the CM thread before |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2376 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2377 // is set) so that if a waiter requests another System.gc() it doesn't |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2378 // incorrectly see that a marking cyle is still in progress. |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2379 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2380 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2381 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2382 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2383 // This notify_all() will ensure that a thread that called |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2384 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2385 // and it's waiting for a full GC to finish will be woken up. It is |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2386 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2387 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2388 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2389 |
342 | 2390 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2391 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2392 GCCauseSetter gcs(this, cause); |
2393 switch (cause) { | |
2394 case GCCause::_heap_inspection: | |
2395 case GCCause::_heap_dump: { | |
2396 HandleMark hm; | |
2397 do_full_collection(false); // don't clear all soft refs | |
2398 break; | |
2399 } | |
2400 default: // XXX FIX ME | |
2401 ShouldNotReachHere(); // Unexpected use of this function | |
2402 } | |
2403 } | |
2404 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2405 void G1CollectedHeap::collect(GCCause::Cause cause) { |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2406 // The caller doesn't have the Heap_lock |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2407 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2408 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2409 unsigned int gc_count_before; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2410 unsigned int full_gc_count_before; |
342 | 2411 { |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2412 MutexLocker ml(Heap_lock); |
1973 | 2413 |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2414 // Read the GC count while holding the Heap_lock |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2415 gc_count_before = SharedHeap::heap()->total_collections(); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2416 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2417 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2418 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2419 if (should_do_concurrent_full_gc(cause)) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2420 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2421 // concurrent cycle. We're setting word_size to 0 which means that |
2422 // we are not requesting a post-GC allocation. | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2423 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2424 0, /* word_size */ |
2425 true, /* should_initiate_conc_mark */ | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2426 g1_policy()->max_pause_time_ms(), |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2427 cause); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2428 VMThread::execute(&op); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2429 } else { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2430 if (cause == GCCause::_gc_locker |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2431 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2432 |
1973 | 2433 // Schedule a standard evacuation pause. We're setting word_size |
2434 // to 0 which means that we are not requesting a post-GC allocation. | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2435 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2436 0, /* word_size */ |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2437 false, /* should_initiate_conc_mark */ |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2438 g1_policy()->max_pause_time_ms(), |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2439 cause); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2440 VMThread::execute(&op); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2441 } else { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2442 // Schedule a Full GC. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2443 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2444 VMThread::execute(&op); |
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2445 } |
342 | 2446 } |
2447 } | |
2448 | |
2449 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2450 if (_g1_committed.contains(p)) { |
2451 // Given that we know that p is in the committed space, | |
2452 // heap_region_containing_raw() should successfully | |
2453 // return the containing region. | |
2454 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2455 return hr->is_in(p); |
2456 } else { | |
2457 return _perm_gen->as_gen()->is_in(p); | |
2458 } | |
2459 } | |
2460 | |
2461 // Iteration functions. | |
2462 | |
2463 // Iterates an OopClosure over all ref-containing fields of objects | |
2464 // within a HeapRegion. | |
2465 | |
2466 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2467 MemRegion _mr; | |
2468 OopClosure* _cl; | |
2469 public: | |
2470 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2471 : _mr(mr), _cl(cl) {} | |
2472 bool doHeapRegion(HeapRegion* r) { | |
2473 if (! r->continuesHumongous()) { | |
2474 r->oop_iterate(_cl); | |
2475 } | |
2476 return false; | |
2477 } | |
2478 }; | |
2479 | |
678 | 2480 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2481 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2482 heap_region_iterate(&blk); |
678 | 2483 if (do_perm) { |
2484 perm_gen()->oop_iterate(cl); | |
2485 } | |
342 | 2486 } |
2487 | |
678 | 2488 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2489 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2490 heap_region_iterate(&blk); |
678 | 2491 if (do_perm) { |
2492 perm_gen()->oop_iterate(cl); | |
2493 } | |
342 | 2494 } |
2495 | |
2496 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2497 | |
2498 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2499 ObjectClosure* _cl; | |
2500 public: | |
2501 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2502 bool doHeapRegion(HeapRegion* r) { | |
2503 if (! r->continuesHumongous()) { | |
2504 r->object_iterate(_cl); | |
2505 } | |
2506 return false; | |
2507 } | |
2508 }; | |
2509 | |
678 | 2510 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2511 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2512 heap_region_iterate(&blk); |
678 | 2513 if (do_perm) { |
2514 perm_gen()->object_iterate(cl); | |
2515 } | |
342 | 2516 } |
2517 | |
2518 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2519 // FIXME: is this right? | |
2520 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2521 } | |
2522 | |
2523 // Calls a SpaceClosure on a HeapRegion. | |
2524 | |
2525 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2526 SpaceClosure* _cl; | |
2527 public: | |
2528 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2529 bool doHeapRegion(HeapRegion* r) { | |
2530 _cl->do_space(r); | |
2531 return false; | |
2532 } | |
2533 }; | |
2534 | |
2535 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2536 SpaceClosureRegionClosure blk(cl); | |
3766 | 2537 heap_region_iterate(&blk); |
342 | 2538 } |
2539 | |
3766 | 2540 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2541 _hrs.iterate(cl); | |
342 | 2542 } |
2543 | |
2544 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2545 HeapRegionClosure* cl) const { |
2546 _hrs.iterate_from(r, cl); | |
342 | 2547 } |
2548 | |
2549 void | |
2550 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
4728
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2551 uint worker, |
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2552 uint no_of_par_workers, |
342 | 2553 jint claim_value) { |
355 | 2554 const size_t regions = n_regions(); |
4728
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2555 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2556 no_of_par_workers : |
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2557 1); |
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2558 assert(UseDynamicNumberOfGCThreads || |
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2559 no_of_par_workers == workers()->total_workers(), |
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2560 "Non dynamic should use fixed number of workers"); |
355 | 2561 // try to spread out the starting points of the workers |
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2562 const size_t start_index = regions / max_workers * (size_t) worker; |
355 | 2563 |
2564 // each worker will actually look at all regions | |
2565 for (size_t count = 0; count < regions; ++count) { | |
2566 const size_t index = (start_index + count) % regions; | |
2567 assert(0 <= index && index < regions, "sanity"); | |
2568 HeapRegion* r = region_at(index); | |
2569 // we'll ignore "continues humongous" regions (we'll process them | |
2570 // when we come across their corresponding "start humongous" | |
2571 // region) and regions already claimed | |
2572 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2573 continue; | |
2574 } | |
2575 // OK, try to claim it | |
342 | 2576 if (r->claimHeapRegion(claim_value)) { |
355 | 2577 // success! |
2578 assert(!r->continuesHumongous(), "sanity"); | |
2579 if (r->startsHumongous()) { | |
2580 // If the region is "starts humongous" we'll iterate over its | |
2581 // "continues humongous" first; in fact we'll do them | |
2582 // first. The order is important. In on case, calling the | |
2583 // closure on the "starts humongous" region might de-allocate | |
2584 // and clear all its "continues humongous" regions and, as a | |
2585 // result, we might end up processing them twice. So, we'll do | |
2586 // them first (notice: most closures will ignore them anyway) and | |
2587 // then we'll do the "starts humongous" region. | |
2588 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2589 HeapRegion* chr = region_at(ch_index); | |
2590 | |
2591 // if the region has already been claimed or it's not | |
2592 // "continues humongous" we're done | |
2593 if (chr->claim_value() == claim_value || | |
2594 !chr->continuesHumongous()) { | |
2595 break; | |
2596 } | |
2597 | |
2598 // Noone should have claimed it directly. We can given | |
2599 // that we claimed its "starts humongous" region. | |
2600 assert(chr->claim_value() != claim_value, "sanity"); | |
2601 assert(chr->humongous_start_region() == r, "sanity"); | |
2602 | |
2603 if (chr->claimHeapRegion(claim_value)) { | |
2604 // we should always be able to claim it; noone else should | |
2605 // be trying to claim this region | |
2606 | |
2607 bool res2 = cl->doHeapRegion(chr); | |
2608 assert(!res2, "Should not abort"); | |
2609 | |
2610 // Right now, this holds (i.e., no closure that actually | |
2611 // does something with "continues humongous" regions | |
2612 // clears them). We might have to weaken it in the future, | |
2613 // but let's leave these two asserts here for extra safety. | |
2614 assert(chr->continuesHumongous(), "should still be the case"); | |
2615 assert(chr->humongous_start_region() == r, "sanity"); | |
2616 } else { | |
2617 guarantee(false, "we should not reach here"); | |
2618 } | |
2619 } | |
2620 } | |
2621 | |
2622 assert(!r->continuesHumongous(), "sanity"); | |
2623 bool res = cl->doHeapRegion(r); | |
2624 assert(!res, "Should not abort"); | |
2625 } | |
2626 } | |
2627 } | |
2628 | |
390 | 2629 class ResetClaimValuesClosure: public HeapRegionClosure { |
2630 public: | |
2631 bool doHeapRegion(HeapRegion* r) { | |
2632 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2633 return false; | |
2634 } | |
2635 }; | |
2636 | |
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2637 void G1CollectedHeap::reset_heap_region_claim_values() { |
390 | 2638 ResetClaimValuesClosure blk; |
2639 heap_region_iterate(&blk); | |
2640 } | |
2641 | |
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2642 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2643 ResetClaimValuesClosure blk; |
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2644 collection_set_iterate(&blk); |
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2645 } |
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2646 |
355 | 2647 #ifdef ASSERT |
2648 // This checks whether all regions in the heap have the correct claim | |
2649 // value. I also piggy-backed on this a check to ensure that the | |
2650 // humongous_start_region() information on "continues humongous" | |
2651 // regions is correct. | |
2652 | |
2653 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2654 private: | |
2655 jint _claim_value; | |
2656 size_t _failures; | |
2657 HeapRegion* _sh_region; | |
2658 public: | |
2659 CheckClaimValuesClosure(jint claim_value) : | |
2660 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2661 bool doHeapRegion(HeapRegion* r) { | |
2662 if (r->claim_value() != _claim_value) { | |
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2663 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2664 "claim value = %d, should be %d", |
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2665 HR_FORMAT_PARAMS(r), |
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2666 r->claim_value(), _claim_value); |
355 | 2667 ++_failures; |
2668 } | |
2669 if (!r->isHumongous()) { | |
2670 _sh_region = NULL; | |
2671 } else if (r->startsHumongous()) { | |
2672 _sh_region = r; | |
2673 } else if (r->continuesHumongous()) { | |
2674 if (r->humongous_start_region() != _sh_region) { | |
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2675 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2676 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2677 HR_FORMAT_PARAMS(r), |
355 | 2678 r->humongous_start_region(), |
2679 _sh_region); | |
2680 ++_failures; | |
342 | 2681 } |
2682 } | |
355 | 2683 return false; |
2684 } | |
2685 size_t failures() { | |
2686 return _failures; | |
2687 } | |
2688 }; | |
2689 | |
2690 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2691 CheckClaimValuesClosure cl(claim_value); | |
2692 heap_region_iterate(&cl); | |
2693 return cl.failures() == 0; | |
2694 } | |
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2695 |
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2696 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2697 jint _claim_value; |
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2698 size_t _failures; |
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2699 |
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2700 public: |
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2701 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2702 _claim_value(claim_value), |
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2703 _failures(0) { } |
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2704 |
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2705 size_t failures() { |
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2706 return _failures; |
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2707 } |
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2708 |
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2709 bool doHeapRegion(HeapRegion* hr) { |
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2710 assert(hr->in_collection_set(), "how?"); |
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2711 assert(!hr->isHumongous(), "H-region in CSet"); |
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2712 if (hr->claim_value() != _claim_value) { |
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2713 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2714 "claim value = %d, should be %d", |
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2715 HR_FORMAT_PARAMS(hr), |
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2716 hr->claim_value(), _claim_value); |
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2717 _failures += 1; |
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2718 } |
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2719 return false; |
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2720 } |
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2721 }; |
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2722 |
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2723 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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2724 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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2725 collection_set_iterate(&cl); |
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2726 return cl.failures() == 0; |
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2727 } |
355 | 2728 #endif // ASSERT |
342 | 2729 |
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2730 // Clear the cached CSet starting regions and (more importantly) |
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2731 // the time stamps. Called when we reset the GC time stamp. |
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2732 void G1CollectedHeap::clear_cset_start_regions() { |
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2733 assert(_worker_cset_start_region != NULL, "sanity"); |
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2734 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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2735 |
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2736 int n_queues = MAX2((int)ParallelGCThreads, 1); |
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2737 for (int i = 0; i < n_queues; i++) { |
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2738 _worker_cset_start_region[i] = NULL; |
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2739 _worker_cset_start_region_time_stamp[i] = 0; |
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2740 } |
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2741 } |
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2742 |
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2743 // Given the id of a worker, obtain or calculate a suitable |
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2744 // starting region for iterating over the current collection set. |
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2745 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
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2746 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
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2747 |
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2748 HeapRegion* result = NULL; |
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2749 unsigned gc_time_stamp = get_gc_time_stamp(); |
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2750 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2751 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2752 // Cached starting region for current worker was set |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2753 // during the current pause - so it's valid. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2754 // Note: the cached starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2755 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2756 result = _worker_cset_start_region[worker_i]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2757 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2758 return result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2759 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2760 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2761 // The cached entry was not valid so let's calculate |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2762 // a suitable starting heap region for this worker. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2763 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2764 // We want the parallel threads to start their collection |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2765 // set iteration at different collection set regions to |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2766 // avoid contention. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2767 // If we have: |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2768 // n collection set regions |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2769 // p threads |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2770 // Then thread t will start at region floor ((t * n) / p) |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2771 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2772 result = g1_policy()->collection_set(); |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2773 if (G1CollectedHeap::use_parallel_gc_threads()) { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2774 size_t cs_size = g1_policy()->cset_region_length(); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2775 uint active_workers = workers()->active_workers(); |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2776 assert(UseDynamicNumberOfGCThreads || |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2777 active_workers == workers()->total_workers(), |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2778 "Unless dynamic should use total workers"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2779 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2780 size_t end_ind = (cs_size * worker_i) / active_workers; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2781 size_t start_ind = 0; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2782 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2783 if (worker_i > 0 && |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2784 _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
|
2785 // Previous workers starting region is valid |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2786 // so let's iterate from there |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2787 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2788 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
|
2789 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2790 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2791 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
|
2792 result = result->next_in_collection_set(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2793 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2794 } |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2795 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2796 // Note: the calculated starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2797 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2798 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2799 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2800 "should be updated only once per pause"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2801 _worker_cset_start_region[worker_i] = result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2802 OrderAccess::storestore(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2803 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2804 return result; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2805 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2806 |
342 | 2807 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2808 HeapRegion* r = g1_policy()->collection_set(); | |
2809 while (r != NULL) { | |
2810 HeapRegion* next = r->next_in_collection_set(); | |
2811 if (cl->doHeapRegion(r)) { | |
2812 cl->incomplete(); | |
2813 return; | |
2814 } | |
2815 r = next; | |
2816 } | |
2817 } | |
2818 | |
2819 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2820 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2821 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2822 // The CSet is empty so there's nothing to do. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2823 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2824 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2825 |
342 | 2826 assert(r->in_collection_set(), |
2827 "Start region must be a member of the collection set."); | |
2828 HeapRegion* cur = r; | |
2829 while (cur != NULL) { | |
2830 HeapRegion* next = cur->next_in_collection_set(); | |
2831 if (cl->doHeapRegion(cur) && false) { | |
2832 cl->incomplete(); | |
2833 return; | |
2834 } | |
2835 cur = next; | |
2836 } | |
2837 cur = g1_policy()->collection_set(); | |
2838 while (cur != r) { | |
2839 HeapRegion* next = cur->next_in_collection_set(); | |
2840 if (cl->doHeapRegion(cur) && false) { | |
2841 cl->incomplete(); | |
2842 return; | |
2843 } | |
2844 cur = next; | |
2845 } | |
2846 } | |
2847 | |
2848 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2849 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2850 } |
2851 | |
2852 | |
2853 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2854 Space* res = heap_region_containing(addr); | |
2855 if (res == NULL) | |
2856 res = perm_gen()->space_containing(addr); | |
2857 return res; | |
2858 } | |
2859 | |
2860 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2861 Space* sp = space_containing(addr); | |
2862 if (sp != NULL) { | |
2863 return sp->block_start(addr); | |
2864 } | |
2865 return NULL; | |
2866 } | |
2867 | |
2868 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2869 Space* sp = space_containing(addr); | |
2870 assert(sp != NULL, "block_size of address outside of heap"); | |
2871 return sp->block_size(addr); | |
2872 } | |
2873 | |
2874 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2875 Space* sp = space_containing(addr); | |
2876 return sp->block_is_obj(addr); | |
2877 } | |
2878 | |
2879 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2880 return true; | |
2881 } | |
2882 | |
2883 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2884 return HeapRegion::GrainBytes; | |
2885 } | |
2886 | |
2887 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2888 // Return the remaining space in the cur alloc region, but not less than | |
2889 // the min TLAB size. | |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2890 |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2891 // Also, this value can be at most the humongous object threshold, |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2892 // since we can't allow tlabs to grow big enough to accomodate |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2893 // humongous objects. |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2894 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2895 HeapRegion* hr = _mutator_alloc_region.get(); |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2896 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
|
2897 if (hr == NULL) { |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2898 return max_tlab_size; |
342 | 2899 } else { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2900 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2901 } |
2902 } | |
2903 | |
2904 size_t G1CollectedHeap::max_capacity() const { | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2905 return _g1_reserved.byte_size(); |
342 | 2906 } |
2907 | |
2908 jlong G1CollectedHeap::millis_since_last_gc() { | |
2909 // assert(false, "NYI"); | |
2910 return 0; | |
2911 } | |
2912 | |
2913 void G1CollectedHeap::prepare_for_verify() { | |
2914 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2915 ensure_parsability(false); | |
2916 } | |
2917 g1_rem_set()->prepare_for_verify(); | |
2918 } | |
2919 | |
2920 class VerifyLivenessOopClosure: public OopClosure { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2921 G1CollectedHeap* _g1h; |
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 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2925 _g1h(g1h), _vo(vo) |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2926 { } |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2927 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
|
2928 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
|
2929 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2930 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
|
2931 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2932 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
|
2933 "Dead object referenced by a not dead object"); |
342 | 2934 } |
2935 }; | |
2936 | |
2937 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2938 private: |
342 | 2939 G1CollectedHeap* _g1h; |
2940 size_t _live_bytes; | |
2941 HeapRegion *_hr; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2942 VerifyOption _vo; |
342 | 2943 public: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2944 // _vo == UsePrevMarking -> use "prev" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2945 // _vo == UseNextMarking -> use "next" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2946 // _vo == UseMarkWord -> use mark word from object header. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2947 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2948 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2949 _g1h = G1CollectedHeap::heap(); |
2950 } | |
2951 void do_object(oop o) { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2952 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2953 assert(o != NULL, "Huh?"); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2954 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2955 // If the object is alive according to the mark word, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2956 // then verify that the marking information agrees. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2957 // Note we can't verify the contra-positive of the |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2958 // above: if the object is dead (according to the mark |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2959 // word), it may not be marked, or may have been marked |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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2960 // but has since became dead, or may have been allocated |
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2961 // since the last marking. |
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2962 if (_vo == VerifyOption_G1UseMarkWord) { |
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2963 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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2964 } |
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2965 |
342 | 2966 o->oop_iterate(&isLive); |
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2967 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2968 size_t obj_size = o->size(); // Make sure we don't overflow |
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2969 _live_bytes += (obj_size * HeapWordSize); |
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2970 } |
342 | 2971 } |
2972 } | |
2973 size_t live_bytes() { return _live_bytes; } | |
2974 }; | |
2975 | |
2976 class PrintObjsInRegionClosure : public ObjectClosure { | |
2977 HeapRegion *_hr; | |
2978 G1CollectedHeap *_g1; | |
2979 public: | |
2980 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2981 _g1 = G1CollectedHeap::heap(); | |
2982 }; | |
2983 | |
2984 void do_object(oop o) { | |
2985 if (o != NULL) { | |
2986 HeapWord *start = (HeapWord *) o; | |
2987 size_t word_sz = o->size(); | |
2988 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2989 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2990 (void*) o, word_sz, | |
2991 _g1->isMarkedPrev(o), | |
2992 _g1->isMarkedNext(o), | |
2993 _hr->obj_allocated_since_prev_marking(o)); | |
2994 HeapWord *end = start + word_sz; | |
2995 HeapWord *cur; | |
2996 int *val; | |
2997 for (cur = start; cur < end; cur++) { | |
2998 val = (int *) cur; | |
2999 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
3000 } | |
3001 } | |
3002 } | |
3003 }; | |
3004 | |
3005 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 3006 private: |
3772
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3007 bool _allow_dirty; |
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3008 bool _par; |
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3009 VerifyOption _vo; |
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3010 bool _failures; |
811 | 3011 public: |
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3012 // _vo == UsePrevMarking -> use "prev" marking information, |
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3013 // _vo == UseNextMarking -> use "next" marking information, |
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3014 // _vo == UseMarkWord -> use mark word from object header. |
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3015 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
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3016 : _allow_dirty(allow_dirty), |
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3017 _par(par), |
3772
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3018 _vo(vo), |
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3019 _failures(false) {} |
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3020 |
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3021 bool failures() { |
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3022 return _failures; |
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|
3023 } |
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3024 |
342 | 3025 bool doHeapRegion(HeapRegion* r) { |
390 | 3026 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
3027 "Should be unclaimed at verify points."); | |
637
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|
3028 if (!r->continuesHumongous()) { |
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3029 bool failures = false; |
3772
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3030 r->verify(_allow_dirty, _vo, &failures); |
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3031 if (failures) { |
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|
3032 _failures = true; |
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|
3033 } else { |
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3034 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
1020
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3035 r->object_iterate(¬_dead_yet_cl); |
4787
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|
3036 if (_vo != VerifyOption_G1UseNextMarking) { |
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3037 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
3038 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
3039 "max_live_bytes "SIZE_FORMAT" " |
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|
3040 "< calculated "SIZE_FORMAT, |
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|
3041 r->bottom(), r->end(), |
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|
3042 r->max_live_bytes(), |
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|
3043 not_dead_yet_cl.live_bytes()); |
4787
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|
3044 _failures = true; |
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|
3045 } |
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|
3046 } else { |
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|
3047 // When vo == UseNextMarking we cannot currently do a sanity |
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|
3048 // check on the live bytes as the calculation has not been |
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|
3049 // finalized yet. |
1020
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|
3050 } |
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|
3051 } |
342 | 3052 } |
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|
3053 return false; // stop the region iteration if we hit a failure |
342 | 3054 } |
3055 }; | |
3056 | |
3057 class VerifyRootsClosure: public OopsInGenClosure { | |
3058 private: | |
3059 G1CollectedHeap* _g1h; | |
3772
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|
3060 VerifyOption _vo; |
342 | 3061 bool _failures; |
3062 public: | |
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|
3063 // _vo == UsePrevMarking -> use "prev" marking information, |
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3064 // _vo == UseNextMarking -> use "next" marking information, |
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3065 // _vo == UseMarkWord -> use mark word from object header. |
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|
3066 VerifyRootsClosure(VerifyOption vo) : |
845
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|
3067 _g1h(G1CollectedHeap::heap()), |
3772
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|
3068 _vo(vo), |
1020
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|
3069 _failures(false) { } |
342 | 3070 |
3071 bool failures() { return _failures; } | |
3072 | |
845
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|
3073 template <class T> void do_oop_nv(T* p) { |
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|
3074 T heap_oop = oopDesc::load_heap_oop(p); |
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|
3075 if (!oopDesc::is_null(heap_oop)) { |
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|
3076 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
3772
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|
3077 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 3078 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
1020
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changeset
|
3079 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
3772
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changeset
|
3080 if (_vo == VerifyOption_G1UseMarkWord) { |
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diff
changeset
|
3081 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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|
3082 } |
342 | 3083 obj->print_on(gclog_or_tty); |
3084 _failures = true; | |
3085 } | |
3086 } | |
3087 } | |
845
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|
3088 |
df6caf649ff7
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diff
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|
3089 void do_oop(oop* p) { do_oop_nv(p); } |
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|
3090 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 3091 }; |
3092 | |
390 | 3093 // This is the task used for parallel heap verification. |
3094 | |
3095 class G1ParVerifyTask: public AbstractGangTask { | |
3096 private: | |
3097 G1CollectedHeap* _g1h; | |
3772
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|
3098 bool _allow_dirty; |
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changeset
|
3099 VerifyOption _vo; |
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changeset
|
3100 bool _failures; |
390 | 3101 |
3102 public: | |
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|
3103 // _vo == UsePrevMarking -> use "prev" marking information, |
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|
3104 // _vo == UseNextMarking -> use "next" marking information, |
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|
3105 // _vo == UseMarkWord -> use mark word from object header. |
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|
3106 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 3107 AbstractGangTask("Parallel verify task"), |
845
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|
3108 _g1h(g1h), |
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|
3109 _allow_dirty(allow_dirty), |
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|
3110 _vo(vo), |
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|
3111 _failures(false) { } |
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|
3112 |
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|
3113 bool failures() { |
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|
3114 return _failures; |
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|
3115 } |
390 | 3116 |
4728
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|
3117 void work(uint worker_id) { |
637
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|
3118 HandleMark hm; |
3772
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|
3119 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
4728
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|
3120 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
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|
3121 _g1h->workers()->active_workers(), |
390 | 3122 HeapRegion::ParVerifyClaimValue); |
1020
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|
3123 if (blk.failures()) { |
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|
3124 _failures = true; |
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|
3125 } |
390 | 3126 } |
3127 }; | |
3128 | |
342 | 3129 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
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|
3130 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 3131 } |
3132 | |
3133 void G1CollectedHeap::verify(bool allow_dirty, | |
3134 bool silent, | |
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|
3135 VerifyOption vo) { |
342 | 3136 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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|
3137 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
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|
3138 VerifyRootsClosure rootsCl(vo); |
4095
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|
3139 |
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|
3140 assert(Thread::current()->is_VM_thread(), |
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|
3141 "Expected to be executed serially by the VM thread at this point"); |
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|
3142 |
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diff
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|
3143 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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|
3144 |
3293
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|
3145 // We apply the relevant closures to all the oops in the |
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diff
changeset
|
3146 // system dictionary, the string table and the code cache. |
1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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|
3147 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
3772
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|
3148 |
3293
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7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
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|
3149 process_strong_roots(true, // activate StrongRootsScope |
1f4413413144
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|
3150 true, // we set "collecting perm gen" to true, |
1f4413413144
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diff
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|
3151 // so we don't reset the dirty cards in the perm gen. |
1f4413413144
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diff
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|
3152 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 3153 &rootsCl, |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
3154 &blobsCl, |
342 | 3155 &rootsCl); |
3772
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|
3156 |
6747fd0512e0
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|
3157 // If we're verifying after the marking phase of a Full GC then we can't |
6747fd0512e0
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|
3158 // treat the perm gen as roots into the G1 heap. Some of the objects in |
6747fd0512e0
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|
3159 // the perm gen may be dead and hence not marked. If one of these dead |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3160 // objects is considered to be a root then we may end up with a false |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3161 // "Root location <x> points to dead ob <y>" failure. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3162 if (vo != VerifyOption_G1UseMarkWord) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3163 // Since we used "collecting_perm_gen" == true above, we will not have |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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changeset
|
3164 // checked the refs from perm into the G1-collected heap. We check those |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
3165 // references explicitly below. Whether the relevant cards are dirty |
6747fd0512e0
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diff
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|
3166 // is checked further below in the rem set verification. |
6747fd0512e0
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diff
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|
3167 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3168 perm_gen()->oop_iterate(&rootsCl); |
6747fd0512e0
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|
3169 } |
1020
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|
3170 bool failures = rootsCl.failures(); |
3772
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|
3171 |
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|
3172 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3173 // If we're verifying during a full GC then the region sets |
6747fd0512e0
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|
3174 // will have been torn down at the start of the GC. Therefore |
6747fd0512e0
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|
3175 // verifying the region sets will fail. So we only verify |
6747fd0512e0
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|
3176 // the region sets when not in a full GC. |
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|
3177 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
6747fd0512e0
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|
3178 verify_region_sets(); |
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|
3179 } |
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|
3180 |
2152 | 3181 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3182 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3183 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3184 "sanity check"); | |
3185 | |
3772
6747fd0512e0
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|
3186 G1ParVerifyTask task(this, allow_dirty, vo); |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3187 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3188 workers()->active_workers() == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3189 "If not dynamic should be using all the workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3190 int n_workers = workers()->active_workers(); |
390 | 3191 set_par_threads(n_workers); |
3192 workers()->run_task(&task); | |
3193 set_par_threads(0); | |
1020
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|
3194 if (task.failures()) { |
ff2402f6a50b
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|
3195 failures = true; |
ff2402f6a50b
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|
3196 } |
390 | 3197 |
4095
bca17e38de00
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|
3198 // Checks that the expected amount of parallel work was done. |
bca17e38de00
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changeset
|
3199 // The implication is that n_workers is > 0. |
390 | 3200 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3201 "sanity check"); | |
3202 | |
3203 reset_heap_region_claim_values(); | |
3204 | |
3205 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3206 "sanity check"); | |
3207 } else { | |
3772
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|
3208 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 3209 heap_region_iterate(&blk); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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diff
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|
3210 if (blk.failures()) { |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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|
3211 failures = true; |
ff2402f6a50b
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|
3212 } |
390 | 3213 } |
2152 | 3214 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3215 rem_set()->verify(); |
1020
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|
3216 |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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|
3217 if (failures) { |
ff2402f6a50b
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|
3218 gclog_or_tty->print_cr("Heap:"); |
4073
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7099849: G1: include heap region information in hs_err files
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|
3219 // It helps to have the per-region information in the output to |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3220 // help us track down what went wrong. This is why we call |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3221 // print_extended_on() instead of print_on(). |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3222 print_extended_on(gclog_or_tty); |
1020
ff2402f6a50b
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|
3223 gclog_or_tty->print_cr(""); |
1547
fb1a39993f69
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jcoomes
parents:
1545
diff
changeset
|
3224 #ifndef PRODUCT |
1044 | 3225 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3226 concurrent_mark()->print_reachable("at-verification-failure", |
3772
6747fd0512e0
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diff
changeset
|
3227 vo, false /* all */); |
1020
ff2402f6a50b
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diff
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|
3228 } |
1547
fb1a39993f69
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jcoomes
parents:
1545
diff
changeset
|
3229 #endif |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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diff
changeset
|
3230 gclog_or_tty->flush(); |
ff2402f6a50b
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diff
changeset
|
3231 } |
ff2402f6a50b
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diff
changeset
|
3232 guarantee(!failures, "there should not have been any failures"); |
342 | 3233 } else { |
3234 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3235 } | |
3236 } | |
3237 | |
3238 class PrintRegionClosure: public HeapRegionClosure { | |
3239 outputStream* _st; | |
3240 public: | |
3241 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3242 bool doHeapRegion(HeapRegion* r) { | |
3243 r->print_on(_st); | |
3244 return false; | |
3245 } | |
3246 }; | |
3247 | |
3248 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3249 st->print(" %-20s", "garbage-first heap"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
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|
3250 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
3251 capacity()/K, used_unlocked()/K); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3252 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3253 _g1_storage.low_boundary(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3254 _g1_storage.high(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3255 _g1_storage.high_boundary()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3256 st->cr(); |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
3257 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3258 size_t young_regions = _young_list->length(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3259 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3260 young_regions, young_regions * HeapRegion::GrainBytes / K); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3261 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3262 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3263 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3264 st->cr(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
3265 perm()->as_gen()->print_on(st); |
4073
53074c2c4600
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diff
changeset
|
3266 } |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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changeset
|
3267 |
53074c2c4600
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|
3268 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4072
diff
changeset
|
3269 print_on(st); |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3270 |
53074c2c4600
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diff
changeset
|
3271 // Print the per-region information. |
53074c2c4600
7099849: G1: include heap region information in hs_err files
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diff
changeset
|
3272 st->cr(); |
53074c2c4600
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|
3273 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 | 3274 PrintRegionClosure blk(st); |
3766 | 3275 heap_region_iterate(&blk); |
342 | 3276 } |
3277 | |
3278 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3279 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3280 workers()->print_worker_threads_on(st); |
3281 } | |
3282 _cmThread->print_on(st); | |
342 | 3283 st->cr(); |
1019 | 3284 _cm->print_worker_threads_on(st); |
3285 _cg1r->print_worker_threads_on(st); | |
342 | 3286 st->cr(); |
3287 } | |
3288 | |
3289 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3290 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3291 workers()->threads_do(tc); |
3292 } | |
3293 tc->do_thread(_cmThread); | |
794 | 3294 _cg1r->threads_do(tc); |
342 | 3295 } |
3296 | |
3297 void G1CollectedHeap::print_tracing_info() const { | |
3298 // We'll overload this to mean "trace GC pause statistics." | |
3299 if (TraceGen0Time || TraceGen1Time) { | |
3300 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3301 // to that. | |
3302 g1_policy()->print_tracing_info(); | |
3303 } | |
751 | 3304 if (G1SummarizeRSetStats) { |
342 | 3305 g1_rem_set()->print_summary_info(); |
3306 } | |
1282 | 3307 if (G1SummarizeConcMark) { |
342 | 3308 concurrent_mark()->print_summary_info(); |
3309 } | |
3310 g1_policy()->print_yg_surv_rate_info(); | |
3311 SpecializationStats::print(); | |
3312 } | |
3313 | |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
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|
3314 #ifndef PRODUCT |
e8b0b0392037
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tonyp
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3774
diff
changeset
|
3315 // Helpful for debugging RSet issues. |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3316 |
e8b0b0392037
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diff
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|
3317 class PrintRSetsClosure : public HeapRegionClosure { |
e8b0b0392037
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3774
diff
changeset
|
3318 private: |
e8b0b0392037
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3774
diff
changeset
|
3319 const char* _msg; |
e8b0b0392037
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3774
diff
changeset
|
3320 size_t _occupied_sum; |
e8b0b0392037
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3774
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changeset
|
3321 |
e8b0b0392037
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diff
changeset
|
3322 public: |
e8b0b0392037
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3774
diff
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|
3323 bool doHeapRegion(HeapRegion* r) { |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3324 HeapRegionRemSet* hrrs = r->rem_set(); |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3325 size_t occupied = hrrs->occupied(); |
e8b0b0392037
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parents:
3774
diff
changeset
|
3326 _occupied_sum += occupied; |
e8b0b0392037
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tonyp
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3774
diff
changeset
|
3327 |
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3328 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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|
3329 HR_FORMAT_PARAMS(r)); |
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|
3330 if (occupied == 0) { |
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|
3331 gclog_or_tty->print_cr(" RSet is empty"); |
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|
3332 } else { |
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|
3333 hrrs->print(); |
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|
3334 } |
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|
3335 gclog_or_tty->print_cr("----------"); |
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|
3336 return false; |
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|
3337 } |
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|
3338 |
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|
3339 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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|
3340 gclog_or_tty->cr(); |
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|
3341 gclog_or_tty->print_cr("========================================"); |
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3342 gclog_or_tty->print_cr(msg); |
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|
3343 gclog_or_tty->cr(); |
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|
3344 } |
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|
3345 |
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|
3346 ~PrintRSetsClosure() { |
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|
3347 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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|
3348 gclog_or_tty->print_cr("========================================"); |
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|
3349 gclog_or_tty->cr(); |
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|
3350 } |
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|
3351 }; |
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|
3352 |
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|
3353 void G1CollectedHeap::print_cset_rsets() { |
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3354 PrintRSetsClosure cl("Printing CSet RSets"); |
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|
3355 collection_set_iterate(&cl); |
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|
3356 } |
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|
3357 |
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|
3358 void G1CollectedHeap::print_all_rsets() { |
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|
3359 PrintRSetsClosure cl("Printing All RSets");; |
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|
3360 heap_region_iterate(&cl); |
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|
3361 } |
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|
3362 #endif // PRODUCT |
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|
3363 |
342 | 3364 G1CollectedHeap* G1CollectedHeap::heap() { |
3365 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3366 "not a garbage-first heap"); | |
3367 return _g1h; | |
3368 } | |
3369 | |
3370 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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6484c4ee11cb
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3371 // always_do_update_barrier = false; |
342 | 3372 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3373 // Call allocation profiler | |
3374 AllocationProfiler::iterate_since_last_gc(); | |
3375 // Fill TLAB's and such | |
3376 ensure_parsability(true); | |
3377 } | |
3378 | |
3379 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3380 // FIXME: what is this about? | |
3381 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3382 // is set. | |
3383 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3384 "derived pointer present")); | |
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|
3385 // always_do_update_barrier = true; |
3979
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|
3386 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
3387 // 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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|
3388 // policy with the new heap occupancy |
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|
3389 Universe::update_heap_info_at_gc(); |
342 | 3390 } |
3391 | |
1973 | 3392 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3393 unsigned int gc_count_before, | |
3394 bool* succeeded) { | |
3395 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3396 g1_policy()->record_stop_world_start(); |
1973 | 3397 VM_G1IncCollectionPause op(gc_count_before, |
3398 word_size, | |
3399 false, /* should_initiate_conc_mark */ | |
3400 g1_policy()->max_pause_time_ms(), | |
3401 GCCause::_g1_inc_collection_pause); | |
3402 VMThread::execute(&op); | |
3403 | |
3404 HeapWord* result = op.result(); | |
3405 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3406 assert(result == NULL || ret_succeeded, | |
3407 "the result should be NULL if the VM did not succeed"); | |
3408 *succeeded = ret_succeeded; | |
3409 | |
3410 assert_heap_not_locked(); | |
3411 return result; | |
342 | 3412 } |
3413 | |
3414 void | |
3415 G1CollectedHeap::doConcurrentMark() { | |
845
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3416 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3417 if (!_cmThread->in_progress()) { |
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3418 _cmThread->set_started(); |
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3419 CGC_lock->notify(); |
342 | 3420 } |
3421 } | |
3422 | |
3423 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3424 bool young) { | |
3425 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3426 } | |
3427 | |
3428 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3429 predicted_time_ms) { | |
3430 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3431 } | |
3432 | |
3433 size_t G1CollectedHeap::pending_card_num() { | |
3434 size_t extra_cards = 0; | |
3435 JavaThread *curr = Threads::first(); | |
3436 while (curr != NULL) { | |
3437 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3438 extra_cards += dcq.size(); | |
3439 curr = curr->next(); | |
3440 } | |
3441 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3442 size_t buffer_size = dcqs.buffer_size(); | |
3443 size_t buffer_num = dcqs.completed_buffers_num(); | |
3444 return buffer_size * buffer_num + extra_cards; | |
3445 } | |
3446 | |
3447 size_t G1CollectedHeap::max_pending_card_num() { | |
3448 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3449 size_t buffer_size = dcqs.buffer_size(); | |
3450 size_t buffer_num = dcqs.completed_buffers_num(); | |
3451 int thread_num = Threads::number_of_threads(); | |
3452 return (buffer_num + thread_num) * buffer_size; | |
3453 } | |
3454 | |
3455 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3456 return g1_rem_set()->cardsScanned(); |
342 | 3457 } |
3458 | |
3459 void | |
3460 G1CollectedHeap::setup_surviving_young_words() { | |
3461 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
4090
a88de71c4e3a
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|
3462 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3463 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
3464 if (_surviving_young_words == NULL) { | |
3465 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3466 "Not enough space for young surv words summary."); | |
3467 } | |
3468 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
845
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|
3469 #ifdef ASSERT |
342 | 3470 for (size_t i = 0; i < array_length; ++i) { |
845
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3471 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3472 } |
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|
3473 #endif // !ASSERT |
342 | 3474 } |
3475 | |
3476 void | |
3477 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3478 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
4090
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|
3479 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3480 for (size_t i = 0; i < array_length; ++i) |
3481 _surviving_young_words[i] += surv_young_words[i]; | |
3482 } | |
3483 | |
3484 void | |
3485 G1CollectedHeap::cleanup_surviving_young_words() { | |
3486 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3487 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3488 _surviving_young_words = NULL; | |
3489 } | |
3490 | |
3777
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|
3491 #ifdef ASSERT |
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|
3492 class VerifyCSetClosure: public HeapRegionClosure { |
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diff
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|
3493 public: |
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diff
changeset
|
3494 bool doHeapRegion(HeapRegion* hr) { |
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diff
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|
3495 // Here we check that the CSet region's RSet is ready for parallel |
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diff
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|
3496 // iteration. The fields that we'll verify are only manipulated |
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diff
changeset
|
3497 // when the region is part of a CSet and is collected. Afterwards, |
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changeset
|
3498 // we reset these fields when we clear the region's RSet (when the |
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diff
changeset
|
3499 // region is freed) so they are ready when the region is |
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changeset
|
3500 // re-allocated. The only exception to this is if there's an |
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diff
changeset
|
3501 // evacuation failure and instead of freeing the region we leave |
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changeset
|
3502 // it in the heap. In that case, we reset these fields during |
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|
3503 // evacuation failure handling. |
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|
3504 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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|
3505 |
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diff
changeset
|
3506 // Here's a good place to add any other checks we'd like to |
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diff
changeset
|
3507 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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1245
diff
changeset
|
3508 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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1245
diff
changeset
|
3509 } |
0414c1049f15
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diff
changeset
|
3510 }; |
3777
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diff
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|
3511 #endif // ASSERT |
1261
0414c1049f15
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diff
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|
3512 |
1709 | 3513 #if TASKQUEUE_STATS |
3514 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3515 st->print_raw_cr("GC Task Stats"); | |
3516 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3517 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3518 } | |
3519 | |
3520 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3521 print_taskqueue_stats_hdr(st); | |
3522 | |
3523 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3524 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3525 for (int i = 0; i < n; ++i) { |
3526 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3527 totals += task_queue(i)->stats; | |
3528 } | |
3529 st->print_raw("tot "); totals.print(st); st->cr(); | |
3530 | |
3531 DEBUG_ONLY(totals.verify()); | |
3532 } | |
3533 | |
3534 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3535 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3536 for (int i = 0; i < n; ++i) { |
3537 task_queue(i)->stats.reset(); | |
3538 } | |
3539 } | |
3540 #endif // TASKQUEUE_STATS | |
3541 | |
1973 | 3542 bool |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3543 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3544 assert_at_safepoint(true /* should_be_vm_thread */); |
3545 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3546 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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parents:
1313
diff
changeset
|
3547 if (GC_locker::check_active_before_gc()) { |
1973 | 3548 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3549 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3550 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3551 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
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2038
diff
changeset
|
3552 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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2038
diff
changeset
|
3553 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3554 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3555 Universe::print_heap_before_gc(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3556 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3557 |
4072 | 3558 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3559 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
3560 verify_dirty_young_regions(); |
2152 | 3561 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3562 // This call will decide whether this pause is an initial-mark |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3563 // pause. If it is, during_initial_mark_pause() will return true |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
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|
3564 // for the duration of this pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3565 g1_policy()->decide_on_conc_mark_initiation(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
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|
3566 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3567 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3568 assert(!g1_policy()->during_initial_mark_pause() || |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3569 g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3570 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3571 // We also do not allow mixed GCs during marking. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
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|
3572 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3573 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3574 // Record whether this pause is an initial mark. When the current |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3575 // thread has completed its logging output and it's safe to signal |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
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|
3576 // the CM thread, the flag's value in the policy has been reset. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3577 bool should_start_conc_mark = g1_policy()->during_initial_mark_pause(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3578 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3579 // Inner scope for scope based logging, timers, and stats collection |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3580 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3581 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3582 sprintf(verbose_str, "GC pause "); |
4710 | 3583 if (g1_policy()->gcs_are_young()) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
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|
3584 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
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diff
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|
3585 } else { |
4710 | 3586 strcat(verbose_str, "(mixed)"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
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diff
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|
3587 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3588 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
3589 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3590 // We are about to start a marking cycle, so we increment the |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3591 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3592 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3593 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3594 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3595 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
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tonyp
parents:
811
diff
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|
3596 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
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tonyp
parents:
811
diff
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|
3597 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3598 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3599 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3600 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3601 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3602 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3603 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3604 |
2361 | 3605 // If the secondary_free_list is not empty, append it to the |
3606 // free_list. No need to wait for the cleanup operation to finish; | |
3607 // the region allocation code will check the secondary_free_list | |
3608 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3609 // set, skip this step so that the region allocation code has to | |
3610 // get entries from the secondary_free_list. | |
2152 | 3611 if (!G1StressConcRegionFreeing) { |
2361 | 3612 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3613 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3614 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3615 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
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|
3616 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3617 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3618 // 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
|
3619 // 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
|
3620 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3621 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3622 { // 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
|
3623 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3624 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3625 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3626 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
|
3627 increment_gc_time_stamp(); |
342 | 3628 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3629 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3630 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
|
3631 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3632 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3633 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3634 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3635 /* option */ VerifyOption_G1UsePrevMarking); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3636 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3637 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3638 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3639 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
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 // 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
|
3656 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3668 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3669 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3671 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3672 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
|
3673 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3674 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3677 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3678 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3681 #endif // YOUNG_LIST_VERBOSE |
342 | 3682 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3688 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 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
|
3692 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3693 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 g1_policy()->choose_collection_set(target_pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3696 _cm->note_start_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3697 // We should not verify the per-thread SATB buffers given that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3698 // we have not filtered them yet (we'll do so during the |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3699 // GC). We also call this after choose_collection_set() to |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3700 // ensure that the CSet has been finalized. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3701 _cm->verify_no_cset_oops(true /* verify_stacks */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3702 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3703 false /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3704 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3705 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3706 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3707 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3713 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3715 type = G1HRPrinter::Eden; |
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 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3718 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3719 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3720 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3721 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3722 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3723 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3724 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3725 #endif // ASSERT |
1707 | 3726 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3732 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3735 // We do this to mainly verify the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3736 // (which have been filtered by now) since we didn't verify |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3737 // them earlier. No point in re-checking the stacks / enqueued |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3738 // buffers given that the CSet has not changed since last time |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3739 // we checked. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3740 _cm->verify_no_cset_oops(false /* verify_stacks */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3741 false /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3742 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3743 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3744 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3746 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3747 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3748 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3749 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 "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
|
3766 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3767 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3770 #endif // YOUNG_LIST_VERBOSE |
342 | 3771 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 _young_list->last_survivor_region()); |
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 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3783 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3784 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3785 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3786 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3788 set_marking_started(); |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3789 // Note that we don't actually trigger the CM thread at |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3790 // this point. We do that later when we're sure that |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3791 // the current thread has completed its logging output. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3793 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3794 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3795 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3796 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3797 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3799 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
|
3800 #endif // YOUNG_LIST_VERBOSE |
342 | 3801 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3804 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3805 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 size_t bytes_before = capacity(); |
4785 | 3808 // No need for an ergo verbose message here, |
3809 // expansion_amount() does this when it returns a value > 0. | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3810 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3811 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3812 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3816 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3817 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3819 // We redo the verificaiton but now wrt to the new CSet which |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3820 // has just got initialized after the previous CSet was freed. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3821 _cm->verify_no_cset_oops(true /* verify_stacks */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3822 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3823 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3824 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3825 _cm->note_end_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3826 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3828 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 g1_policy()->record_pause_time_ms(pause_time_ms); |
4711 | 3830 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
3831 workers()->active_workers() : 1); | |
3832 g1_policy()->record_collection_pause_end(active_workers); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 // 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
|
3837 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3838 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 // 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
|
3840 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3846 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3847 // 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
|
3848 // 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
|
3849 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3850 // 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
|
3851 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3852 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3853 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3854 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3855 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3856 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3857 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3858 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3859 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3860 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3861 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3862 prepare_for_verify(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3863 Universe::verify(/* allow dirty */ true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3864 /* silent */ false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3865 /* option */ VerifyOption_G1UsePrevMarking); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3866 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3867 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3868 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3869 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3870 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3871 // 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
|
3872 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3873 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3874 // 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
|
3875 // 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
|
3876 // 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
|
3877 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3878 _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
|
3879 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3880 // 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
|
3881 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3882 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3883 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3884 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3885 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3886 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3887 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3888 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3889 #endif |
342 | 3890 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3891 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3892 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3893 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3894 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3895 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
|
3896 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3897 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3898 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3899 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3900 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3901 // The closing of the inner scope, immediately above, will complete |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3902 // the PrintGC logging output. The record_collection_pause_end() call |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3903 // above will complete the logging output of PrintGCDetails. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3904 // |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3905 // It is not yet to safe, however, to tell the concurrent mark to |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3906 // start as we have some optional output below. We don't want the |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3907 // output from the concurrent mark thread interfering with this |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3908 // logging output either. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3909 |
3766 | 3910 _hrs.verify_optional(); |
2152 | 3911 verify_region_sets_optional(); |
3912 | |
1709 | 3913 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3914 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3915 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3916 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3917 Universe::print_heap_after_gc(); |
342 | 3918 } |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3919 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3920 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3921 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3922 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3923 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3924 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3925 } |
1973 | 3926 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3927 // It should now be safe to tell the concurrent mark thread to start |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3928 // without its logging output interfering with the logging output |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3929 // that came from the pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3930 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3931 if (should_start_conc_mark) { |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3932 // CAUTION: after the doConcurrentMark() call below, |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3933 // the concurrent marking thread(s) could be running |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3934 // concurrently with us. Make sure that anything after |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3935 // this point does not assume that we are the only GC thread |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3936 // running. Note: of course, the actual marking work will |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3937 // not start until the safepoint itself is released in |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3938 // ConcurrentGCThread::safepoint_desynchronize(). |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3939 doConcurrentMark(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3940 } |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3941 |
1973 | 3942 return true; |
342 | 3943 } |
3944 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3945 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3946 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3947 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3948 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3949 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3950 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3951 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3952 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3953 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3954 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3955 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3956 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3957 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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1390
diff
changeset
|
3958 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3959 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3960 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
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|
3961 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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diff
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|
3962 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
3963 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
3964 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
3965 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3966 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
3967 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3968 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
3969 _mutator_alloc_region.release(); |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
3970 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
3971 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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1390
diff
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|
3972 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
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|
3973 void G1CollectedHeap::init_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
3974 assert_at_safepoint(true /* should_be_vm_thread */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
3975 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3976 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3977 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3978 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3979 _retained_old_gc_alloc_region = NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3980 |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3981 // We will discard the current GC alloc region if: |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3982 // a) it's in the collection set (it can happen!), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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|
3983 // b) it's already full (no point in using it), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3984 // c) it's empty (this means that it was emptied during |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
3985 // a cleanup and it should be on the free list now), or |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3986 // d) it's humongous (this means that it was emptied |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
3987 // 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
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diff
changeset
|
3988 // has been subseqently used to allocate a humongous |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3989 // object that may be less than the region size). |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
3990 if (retained_region != NULL && |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3991 !retained_region->in_collection_set() && |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
3992 !(retained_region->top() == retained_region->end()) && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
3993 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
3994 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
3995 retained_region->set_saved_mark(); |
4072 | 3996 // The retained region was added to the old region set when it was |
3997 // retired. We have to remove it now, since we don't allow regions | |
3998 // we allocate to in the region sets. We'll re-add it later, when | |
3999 // it's retired again. | |
4000 _old_set.remove(retained_region); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4001 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
4002 retained_region->note_start_of_copying(during_im); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
4003 _old_gc_alloc_region.set(retained_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
4004 _hr_printer.reuse(retained_region); |
342 | 4005 } |
4006 } | |
4007 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4008 void G1CollectedHeap::release_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
4009 _survivor_gc_alloc_region.release(); |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
4010 // If we have an old GC alloc region to release, we'll save it in |
f44782f04dd4
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|
4011 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
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parents:
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|
4012 // _retained_old_gc_alloc_region will become NULL. This is what we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4013 // 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
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parents:
3824
diff
changeset
|
4014 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
4015 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 4016 } |
4017 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
4018 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
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|
4019 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
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|
4020 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
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tonyp
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diff
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|
4021 _retained_old_gc_alloc_region = NULL; |
342 | 4022 } |
4023 | |
4024 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
4025 _drain_in_progress = false; | |
4026 set_evac_failure_closure(cl); | |
4027 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4028 } | |
4029 | |
4030 void G1CollectedHeap::finalize_for_evac_failure() { | |
4031 assert(_evac_failure_scan_stack != NULL && | |
4032 _evac_failure_scan_stack->length() == 0, | |
4033 "Postcondition"); | |
4034 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 4035 delete _evac_failure_scan_stack; |
342 | 4036 _evac_failure_scan_stack = NULL; |
4037 } | |
4038 | |
4039 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4040 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4041 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4042 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4043 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4044 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4045 if (G1CollectedHeap::use_parallel_gc_threads()) { |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4046 set_par_threads(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4047 workers()->run_task(&rsfp_task); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4048 set_par_threads(0); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4049 } else { |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4050 rsfp_task.work(0); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4051 } |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4052 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4053 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4054 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4055 // Reset the claim values in the regions in the collection set. |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4056 reset_cset_heap_region_claim_values(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4057 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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4781
diff
changeset
|
4058 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
342 | 4059 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
4060 | |
4061 // Now restore saved marks, if any. | |
4062 if (_objs_with_preserved_marks != NULL) { | |
4063 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4064 guarantee(_objs_with_preserved_marks->length() == | |
4065 _preserved_marks_of_objs->length(), "Both or none."); | |
4066 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4067 oop obj = _objs_with_preserved_marks->at(i); | |
4068 markOop m = _preserved_marks_of_objs->at(i); | |
4069 obj->set_mark(m); | |
4070 } | |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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parents:
4781
diff
changeset
|
4071 |
342 | 4072 // Delete the preserved marks growable arrays (allocated on the C heap). |
4073 delete _objs_with_preserved_marks; | |
4074 delete _preserved_marks_of_objs; | |
4075 _objs_with_preserved_marks = NULL; | |
4076 _preserved_marks_of_objs = NULL; | |
4077 } | |
4078 } | |
4079 | |
4080 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4081 _evac_failure_scan_stack->push(obj); | |
4082 } | |
4083 | |
4084 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4085 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4086 | |
4087 while (_evac_failure_scan_stack->length() > 0) { | |
4088 oop obj = _evac_failure_scan_stack->pop(); | |
4089 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4090 obj->oop_iterate_backwards(_evac_failure_closure); | |
4091 } | |
4092 } | |
4093 | |
4094 oop | |
4095 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4096 oop old) { |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4097 assert(obj_in_cs(old), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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diff
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|
4098 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
75af3e8de182
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diff
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|
4099 (HeapWord*) old)); |
342 | 4100 markOop m = old->mark(); |
4101 oop forward_ptr = old->forward_to_atomic(old); | |
4102 if (forward_ptr == NULL) { | |
4103 // Forward-to-self succeeded. | |
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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3920
diff
changeset
|
4104 |
342 | 4105 if (_evac_failure_closure != cl) { |
4106 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4107 assert(!_drain_in_progress, | |
4108 "Should only be true while someone holds the lock."); | |
4109 // Set the global evac-failure closure to the current thread's. | |
4110 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4111 set_evac_failure_closure(cl); | |
4112 // Now do the common part. | |
4113 handle_evacuation_failure_common(old, m); | |
4114 // Reset to NULL. | |
4115 set_evac_failure_closure(NULL); | |
4116 } else { | |
4117 // The lock is already held, and this is recursive. | |
4118 assert(_drain_in_progress, "This should only be the recursive case."); | |
4119 handle_evacuation_failure_common(old, m); | |
4120 } | |
4121 return old; | |
4122 } else { | |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4123 // Forward-to-self failed. Either someone else managed to allocate |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
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|
4124 // space for this object (old != forward_ptr) or they beat us in |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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diff
changeset
|
4125 // self-forwarding it (old == forward_ptr). |
75af3e8de182
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diff
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|
4126 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4127 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
75af3e8de182
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3317
diff
changeset
|
4128 "should not be in the CSet", |
75af3e8de182
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diff
changeset
|
4129 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4130 return forward_ptr; |
4131 } | |
4132 } | |
4133 | |
4134 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4135 set_evacuation_failed(true); | |
4136 | |
4137 preserve_mark_if_necessary(old, m); | |
4138 | |
4139 HeapRegion* r = heap_region_containing(old); | |
4140 if (!r->evacuation_failed()) { | |
4141 r->set_evacuation_failed(true); | |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4142 _hr_printer.evac_failure(r); |
342 | 4143 } |
4144 | |
4145 push_on_evac_failure_scan_stack(old); | |
4146 | |
4147 if (!_drain_in_progress) { | |
4148 // prevent recursion in copy_to_survivor_space() | |
4149 _drain_in_progress = true; | |
4150 drain_evac_failure_scan_stack(); | |
4151 _drain_in_progress = false; | |
4152 } | |
4153 } | |
4154 | |
4155 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
|
4156 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4157 // 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
|
4158 // case of a promotion failure. |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4159 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4160 if (_objs_with_preserved_marks == NULL) { |
4161 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4162 _objs_with_preserved_marks = | |
4163 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4164 _preserved_marks_of_objs = | |
4165 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4166 } | |
4167 _objs_with_preserved_marks->push(obj); | |
4168 _preserved_marks_of_objs->push(m); | |
4169 } | |
4170 } | |
4171 | |
4172 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4173 size_t word_size) { | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4174 if (purpose == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4175 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
|
4176 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4177 return result; |
342 | 4178 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4179 // 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
|
4180 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4181 return old_attempt_allocation(word_size); |
342 | 4182 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4183 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4184 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4185 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
|
4186 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4187 return result; |
342 | 4188 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4189 // 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
|
4190 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4191 return survivor_attempt_allocation(word_size); |
342 | 4192 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4193 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4194 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4195 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4196 // 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
|
4197 return NULL; |
342 | 4198 } |
4199 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4200 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4201 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4202 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4203 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4204 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4205 _refs(g1h->task_queue(queue_num)), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4206 _dcq(&g1h->dirty_card_queue_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4207 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4208 _g1_rem(g1h->g1_rem_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4209 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4210 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4211 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4212 _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
|
4213 _age_table(false), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4214 _strong_roots_time(0), _term_time(0), |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4215 _alloc_buffer_waste(0), _undo_waste(0) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4216 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4217 // we "sacrifice" entry 0 to keep track of surviving bytes for |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4218 // non-young regions (where the age is -1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4219 // We also add a few elements at the beginning and at the end in |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4220 // an attempt to eliminate cache contention |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
4221 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4222 size_t array_length = PADDING_ELEM_NUM + |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4223 real_length + |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4224 PADDING_ELEM_NUM; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4225 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4226 if (_surviving_young_words_base == NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4227 vm_exit_out_of_memory(array_length * sizeof(size_t), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4228 "Not enough space for young surv histo."); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4229 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4230 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4231 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4232 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4233 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4234 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4235 _start = os::elapsedTime(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4236 } |
342 | 4237 |
1709 | 4238 void |
4239 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4240 { | |
4241 st->print_raw_cr("GC Termination Stats"); | |
4242 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4243 " ------waste (KiB)------"); | |
4244 st->print_raw_cr("thr ms ms % ms % attempts" | |
4245 " total alloc undo"); | |
4246 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4247 " ------- ------- -------"); | |
4248 } | |
4249 | |
4250 void | |
4251 G1ParScanThreadState::print_termination_stats(int i, | |
4252 outputStream* const st) const | |
4253 { | |
4254 const double elapsed_ms = elapsed_time() * 1000.0; | |
4255 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4256 const double term_ms = term_time() * 1000.0; | |
4257 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4258 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4259 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4260 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4261 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4262 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4263 alloc_buffer_waste() * HeapWordSize / K, | |
4264 undo_waste() * HeapWordSize / K); | |
4265 } | |
4266 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4267 #ifdef ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4268 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4269 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4270 assert(UseCompressedOops, "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4271 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4272 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4273 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4274 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4275 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4276 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4277 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4278 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4279 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4280 if (has_partial_array_mask(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4281 // Must be in the collection set--it's already been copied. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4282 oop p = clear_partial_array_mask(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4283 assert(_g1h->obj_in_cs(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4284 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4285 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4286 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4287 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4288 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4289 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4290 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4291 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4292 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4293 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4294 if (ref.is_narrow()) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4295 return verify_ref((narrowOop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4296 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4297 return verify_ref((oop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4298 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4299 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4300 #endif // ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4301 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4302 void G1ParScanThreadState::trim_queue() { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4303 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4304 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4305 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4306 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4307 StarTask ref; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4308 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4309 // Drain the overflow stack first, so other threads can steal. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4310 while (refs()->pop_overflow(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4311 deal_with_reference(ref); |
b14ec34b1e07
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4312 } |
3979
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|
4313 |
1862
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4314 while (refs()->pop_local(ref)) { |
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4315 deal_with_reference(ref); |
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4316 } |
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4317 } while (!refs()->is_empty()); |
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|
4318 } |
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|
4319 |
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4320 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
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4321 G1ParScanThreadState* par_scan_state) : |
342 | 4322 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
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4323 _par_scan_state(par_scan_state), |
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4324 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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4325 _mark_in_progress(_g1->mark_in_progress()) { } |
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4326 |
4787
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4327 void G1ParCopyHelper::mark_object(oop obj) { |
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4328 #ifdef ASSERT |
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4329 HeapRegion* hr = _g1->heap_region_containing(obj); |
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4330 assert(hr != NULL, "sanity"); |
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4331 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
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4332 #endif // ASSERT |
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4333 |
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4334 // We know that the object is not moving so it's safe to read its size. |
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4335 _cm->grayRoot(obj, (size_t) obj->size()); |
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4336 } |
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4337 |
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4338 void G1ParCopyHelper::mark_forwarded_object(oop from_obj, oop to_obj) { |
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4339 #ifdef ASSERT |
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4340 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
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4341 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
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4342 assert(from_obj != to_obj, "should not be self-forwarded"); |
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4343 |
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4344 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
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4345 assert(from_hr != NULL, "sanity"); |
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4346 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
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4347 |
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4348 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
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4349 assert(to_hr != NULL, "sanity"); |
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4350 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
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4351 #endif // ASSERT |
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4352 |
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4353 // The object might be in the process of being copied by another |
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4354 // worker so we cannot trust that its to-space image is |
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4355 // well-formed. So we have to read its size from its from-space |
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4356 // image which we know should not be changing. |
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4357 _cm->grayRoot(to_obj, (size_t) from_obj->size()); |
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4358 } |
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4359 |
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4360 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { |
342 | 4361 size_t word_sz = old->size(); |
4362 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4363 // +1 to make the -1 indexes valid... | |
4364 int young_index = from_region->young_index_in_cset()+1; | |
4787
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4365 assert( (from_region->is_young() && young_index > 0) || |
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4366 (!from_region->is_young() && young_index == 0), "invariant" ); |
342 | 4367 G1CollectorPolicy* g1p = _g1->g1_policy(); |
4368 markOop m = old->mark(); | |
545 | 4369 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4370 : m->age(); | |
4371 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4372 word_sz); |
4373 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4374 oop obj = oop(obj_ptr); | |
4375 | |
4376 if (obj_ptr == NULL) { | |
4377 // This will either forward-to-self, or detect that someone else has | |
4378 // installed a forwarding pointer. | |
4379 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
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4380 return _g1->handle_evacuation_failure_par(cl, old); |
342 | 4381 } |
4382 | |
526 | 4383 // We're going to allocate linearly, so might as well prefetch ahead. |
4384 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4385 | |
342 | 4386 oop forward_ptr = old->forward_to_atomic(obj); |
4387 if (forward_ptr == NULL) { | |
4388 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4389 if (g1p->track_object_age(alloc_purpose)) { |
4390 // We could simply do obj->incr_age(). However, this causes a | |
4391 // performance issue. obj->incr_age() will first check whether | |
4392 // the object has a displaced mark by checking its mark word; | |
4393 // getting the mark word from the new location of the object | |
4394 // stalls. So, given that we already have the mark word and we | |
4395 // are about to install it anyway, it's better to increase the | |
4396 // age on the mark word, when the object does not have a | |
4397 // displaced mark word. We're not expecting many objects to have | |
4398 // a displaced marked word, so that case is not optimized | |
4399 // further (it could be...) and we simply call obj->incr_age(). | |
4400 | |
4401 if (m->has_displaced_mark_helper()) { | |
4402 // in this case, we have to install the mark word first, | |
4403 // otherwise obj looks to be forwarded (the old mark word, | |
4404 // which contains the forward pointer, was copied) | |
4405 obj->set_mark(m); | |
4406 obj->incr_age(); | |
4407 } else { | |
4408 m = m->incr_age(); | |
545 | 4409 obj->set_mark(m); |
526 | 4410 } |
545 | 4411 _par_scan_state->age_table()->add(obj, word_sz); |
4412 } else { | |
4413 obj->set_mark(m); | |
526 | 4414 } |
4415 | |
342 | 4416 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
4417 surv_young_words[young_index] += word_sz; | |
4418 | |
4419 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4784
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4420 // We keep track of the next start index in the length field of |
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4421 // the to-space object. The actual length can be found in the |
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4422 // length field of the from-space object. |
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|
4423 arrayOop(obj)->set_length(0); |
845
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4424 oop* old_p = set_partial_array_mask(old); |
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4425 _par_scan_state->push_on_queue(old_p); |
342 | 4426 } else { |
526 | 4427 // No point in using the slower heap_region_containing() method, |
4428 // given that we know obj is in the heap. | |
4429 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4430 obj->oop_iterate_backwards(_scanner); |
4431 } | |
4432 } else { | |
4433 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4434 obj = forward_ptr; | |
4435 } | |
4436 return obj; | |
4437 } | |
4438 | |
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4439 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
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4440 template <class T> |
3886
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4441 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
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4442 ::do_oop_work(T* p) { |
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4443 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4444 assert(barrier != G1BarrierRS || obj != NULL, |
4787
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|
4445 "Precondition: G1BarrierRS implies obj is non-NULL"); |
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4446 |
526 | 4447 // here the null check is implicit in the cset_fast_test() test |
1261
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|
4448 if (_g1->in_cset_fast_test(obj)) { |
4787
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|
4449 oop forwardee; |
526 | 4450 if (obj->is_forwarded()) { |
4787
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|
4451 forwardee = obj->forwardee(); |
526 | 4452 } else { |
4787
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|
4453 forwardee = copy_to_survivor_space(obj); |
342 | 4454 } |
4787
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|
4455 assert(forwardee != NULL, "forwardee should not be NULL"); |
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|
4456 oopDesc::encode_store_heap_oop(p, forwardee); |
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|
4457 if (do_mark_object && forwardee != obj) { |
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|
4458 // If the object is self-forwarded we don't need to explicitly |
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|
4459 // mark it, the evacuation failure protocol will do so. |
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|
4460 mark_forwarded_object(obj, forwardee); |
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|
4461 } |
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|
4462 |
526 | 4463 // When scanning the RS, we only care about objs in CS. |
4464 if (barrier == G1BarrierRS) { | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
4465 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4466 } |
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|
4467 } else { |
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|
4468 // The object is not in collection set. If we're a root scanning |
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|
4469 // closure during an initial mark pause (i.e. do_mark_object will |
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|
4470 // be true) then attempt to mark the object. |
4787
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|
4471 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
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|
4472 mark_object(obj); |
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|
4473 } |
526 | 4474 } |
4475 | |
4476 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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|
4477 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4478 } |
4479 | |
4480 if (do_gen_barrier && obj != NULL) { | |
4481 par_do_barrier(p); | |
4482 } | |
4483 } | |
4484 | |
1261
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|
4485 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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|
4486 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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|
4487 |
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|
4488 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4489 assert(has_partial_array_mask(p), "invariant"); |
4784
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|
4490 oop from_obj = clear_partial_array_mask(p); |
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|
4491 |
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|
4492 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
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|
4493 assert(from_obj->is_objArray(), "must be obj array"); |
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|
4494 objArrayOop from_obj_array = objArrayOop(from_obj); |
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|
4495 // The from-space object contains the real length. |
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|
4496 int length = from_obj_array->length(); |
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|
4497 |
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|
4498 assert(from_obj->is_forwarded(), "must be forwarded"); |
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4499 oop to_obj = from_obj->forwardee(); |
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4500 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
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4501 objArrayOop to_obj_array = objArrayOop(to_obj); |
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4502 // We keep track of the next start index in the length field of the |
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|
4503 // to-space object. |
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|
4504 int next_index = to_obj_array->length(); |
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4505 assert(0 <= next_index && next_index < length, |
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|
4506 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
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|
4507 |
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4508 int start = next_index; |
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|
4509 int end = length; |
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|
4510 int remainder = end - start; |
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|
4511 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
342 | 4512 if (remainder > 2 * ParGCArrayScanChunk) { |
4513 end = start + ParGCArrayScanChunk; | |
4784
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|
4514 to_obj_array->set_length(end); |
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4515 // Push the remainder before we process the range in case another |
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4516 // worker has run out of things to do and can steal it. |
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4517 oop* from_obj_p = set_partial_array_mask(from_obj); |
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4518 _par_scan_state->push_on_queue(from_obj_p); |
342 | 4519 } else { |
4784
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4520 assert(length == end, "sanity"); |
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4521 // We'll process the final range for this object. Restore the length |
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4522 // so that the heap remains parsable in case of evacuation failure. |
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|
4523 to_obj_array->set_length(end); |
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|
4524 } |
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|
4525 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
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4526 // Process indexes [start,end). It will also process the header |
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|
4527 // along with the first chunk (i.e., the chunk with start == 0). |
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|
4528 // Note that at this point the length field of to_obj_array is not |
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|
4529 // correct given that we are using it to keep track of the next |
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|
4530 // start index. oop_iterate_range() (thankfully!) ignores the length |
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|
4531 // field and only relies on the start / end parameters. It does |
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|
4532 // however return the size of the object which will be incorrect. So |
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|
4533 // we have to ignore it even if we wanted to use it. |
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|
4534 to_obj_array->oop_iterate_range(&_scanner, start, end); |
342 | 4535 } |
4536 | |
4537 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4538 protected: | |
4539 G1CollectedHeap* _g1h; | |
4540 G1ParScanThreadState* _par_scan_state; | |
4541 RefToScanQueueSet* _queues; | |
4542 ParallelTaskTerminator* _terminator; | |
4543 | |
4544 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4545 RefToScanQueueSet* queues() { return _queues; } | |
4546 ParallelTaskTerminator* terminator() { return _terminator; } | |
4547 | |
4548 public: | |
4549 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4550 G1ParScanThreadState* par_scan_state, | |
4551 RefToScanQueueSet* queues, | |
4552 ParallelTaskTerminator* terminator) | |
4553 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4554 _queues(queues), _terminator(terminator) {} | |
4555 | |
1862
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|
4556 void do_void(); |
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|
4557 |
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|
4558 private: |
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|
4559 inline bool offer_termination(); |
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|
4560 }; |
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|
4561 |
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|
4562 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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|
4563 G1ParScanThreadState* const pss = par_scan_state(); |
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|
4564 pss->start_term_time(); |
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4565 const bool res = terminator()->offer_termination(); |
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|
4566 pss->end_term_time(); |
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|
4567 return res; |
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|
4568 } |
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|
4569 |
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|
4570 void G1ParEvacuateFollowersClosure::do_void() { |
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|
4571 StarTask stolen_task; |
b14ec34b1e07
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|
4572 G1ParScanThreadState* const pss = par_scan_state(); |
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|
4573 pss->trim_queue(); |
b14ec34b1e07
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|
4574 |
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|
4575 do { |
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|
4576 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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|
4577 assert(pss->verify_task(stolen_task), "sanity"); |
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|
4578 if (stolen_task.is_narrow()) { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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|
4579 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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|
4580 } else { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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changeset
|
4581 pss->deal_with_reference((oop*) stolen_task); |
1862
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|
4582 } |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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|
4583 |
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changeset
|
4584 // We've just processed a reference and we might have made |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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changeset
|
4585 // available new entries on the queues. So we have to make sure |
35e4e086d5f5
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|
4586 // we drain the queues as necessary. |
342 | 4587 pss->trim_queue(); |
4588 } | |
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4589 } while (!offer_termination()); |
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|
4590 |
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|
4591 pss->retire_alloc_buffers(); |
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|
4592 } |
342 | 4593 |
4594 class G1ParTask : public AbstractGangTask { | |
4595 protected: | |
4596 G1CollectedHeap* _g1h; | |
4597 RefToScanQueueSet *_queues; | |
4598 ParallelTaskTerminator _terminator; | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
4599 uint _n_workers; |
342 | 4600 |
4601 Mutex _stats_lock; | |
4602 Mutex* stats_lock() { return &_stats_lock; } | |
4603 | |
4604 size_t getNCards() { | |
4605 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4606 / G1BlockOffsetSharedArray::N_bytes; | |
4607 } | |
4608 | |
4609 public: | |
4095
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|
4610 G1ParTask(G1CollectedHeap* g1h, |
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|
4611 RefToScanQueueSet *task_queues) |
342 | 4612 : AbstractGangTask("G1 collection"), |
4613 _g1h(g1h), | |
4614 _queues(task_queues), | |
4095
bca17e38de00
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|
4615 _terminator(0, _queues), |
bca17e38de00
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changeset
|
4616 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 4617 {} |
4618 | |
4619 RefToScanQueueSet* queues() { return _queues; } | |
4620 | |
4621 RefToScanQueue *work_queue(int i) { | |
4622 return queues()->queue(i); | |
4623 } | |
4624 | |
4095
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|
4625 ParallelTaskTerminator* terminator() { return &_terminator; } |
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|
4626 |
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|
4627 virtual void set_for_termination(int active_workers) { |
bca17e38de00
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|
4628 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
bca17e38de00
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|
4629 // in the young space (_par_seq_tasks) in the G1 heap |
bca17e38de00
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|
4630 // for SequentialSubTasksDone. |
bca17e38de00
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|
4631 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
bca17e38de00
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|
4632 // both of which need setting by set_n_termination(). |
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|
4633 _g1h->SharedHeap::set_n_termination(active_workers); |
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|
4634 _g1h->set_n_termination(active_workers); |
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|
4635 terminator()->reset_for_reuse(active_workers); |
bca17e38de00
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|
4636 _n_workers = active_workers; |
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|
4637 } |
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|
4638 |
4728
441e946dc1af
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jmasa
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4711
diff
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|
4639 void work(uint worker_id) { |
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7121618: Change type of number of GC workers to unsigned int.
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parents:
4711
diff
changeset
|
4640 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 4641 |
4642 double start_time_ms = os::elapsedTime() * 1000.0; | |
4728
441e946dc1af
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jmasa
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|
4643 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 4644 |
342 | 4645 ResourceMark rm; |
4646 HandleMark hm; | |
4647 | |
3979
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6484982: G1: process references during evacuation pauses
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|
4648 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4649 |
4728
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7121618: Change type of number of GC workers to unsigned int.
jmasa
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diff
changeset
|
4650 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4651 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4652 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4653 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
342 | 4654 |
4655 pss.set_evac_closure(&scan_evac_cl); | |
4656 pss.set_evac_failure_closure(&evac_failure_cl); | |
4657 pss.set_partial_scan_closure(&partial_scan_cl); | |
4658 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
4659 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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|
4660 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4661 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4662 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4663 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4664 |
4dfb2df418f2
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|
4665 OopClosure* scan_root_cl = &only_scan_root_cl; |
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4666 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
342 | 4667 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
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|
4668 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
3979
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|
4669 // We also need to mark copied objects. |
342 | 4670 scan_root_cl = &scan_mark_root_cl; |
4671 scan_perm_cl = &scan_mark_perm_cl; | |
4672 } | |
4673 | |
3983
811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
johnc
parents:
3982
diff
changeset
|
4674 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
3979
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|
4675 |
342 | 4676 pss.start_strong_roots(); |
4677 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4678 SharedHeap::SO_AllClasses, | |
4679 scan_root_cl, | |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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1245
diff
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|
4680 &push_heap_rs_cl, |
342 | 4681 scan_perm_cl, |
4728
441e946dc1af
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|
4682 worker_id); |
342 | 4683 pss.end_strong_roots(); |
3823
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4684 |
342 | 4685 { |
4686 double start = os::elapsedTime(); | |
4687 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4688 evac.do_void(); | |
4689 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4690 double term_ms = pss.term_time()*1000.0; | |
4728
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|
4691 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
441e946dc1af
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4692 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
342 | 4693 } |
1282 | 4694 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4695 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4696 | |
4697 // Clean up any par-expanded rem sets. | |
4698 HeapRegionRemSet::par_cleanup(); | |
4699 | |
4700 if (ParallelGCVerbose) { | |
1709 | 4701 MutexLocker x(stats_lock()); |
4728
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|
4702 pss.print_termination_stats(worker_id); |
342 | 4703 } |
4704 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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|
4705 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4706 double end_time_ms = os::elapsedTime() * 1000.0; |
4728
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4707 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 4708 } |
4709 }; | |
4710 | |
4711 // *** Common G1 Evacuation Stuff | |
4712 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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|
4713 // This method is run in a GC worker. |
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|
4714 |
342 | 4715 void |
4716 G1CollectedHeap:: | |
4717 g1_process_strong_roots(bool collecting_perm_gen, | |
4718 SharedHeap::ScanningOption so, | |
4719 OopClosure* scan_non_heap_roots, | |
4720 OopsInHeapRegionClosure* scan_rs, | |
4721 OopsInGenClosure* scan_perm, | |
4722 int worker_i) { | |
3979
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|
4723 |
342 | 4724 // First scan the strong roots, including the perm gen. |
4725 double ext_roots_start = os::elapsedTime(); | |
4726 double closure_app_time_sec = 0.0; | |
4727 | |
4728 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4729 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4730 buf_scan_perm.set_generation(perm_gen()); | |
4731 | |
989
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6863023: need non-perm oops in code cache for JSR 292
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changeset
|
4732 // Walk the code cache w/o buffering, because StarTask cannot handle |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
4733 // unaligned oop locations. |
148e5441d916
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diff
changeset
|
4734 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
4735 |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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diff
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|
4736 process_strong_roots(false, // no scoping; this is parallel code |
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diff
changeset
|
4737 collecting_perm_gen, so, |
342 | 4738 &buf_scan_non_heap_roots, |
989
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6863023: need non-perm oops in code cache for JSR 292
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890
diff
changeset
|
4739 &eager_scan_code_roots, |
342 | 4740 &buf_scan_perm); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4741 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4742 // Now the CM ref_processor roots. |
3823
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diff
changeset
|
4743 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
4dfb2df418f2
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parents:
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|
4744 // We need to treat the discovered reference lists of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4745 // concurrent mark ref processor as roots and keep entries |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4746 // (which are added by the marking threads) on them live |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4747 // until they can be processed at the end of marking. |
4dfb2df418f2
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diff
changeset
|
4748 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
14a2fd14c0db
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parents:
3778
diff
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|
4749 } |
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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diff
changeset
|
4750 |
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changeset
|
4751 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4752 buf_scan_non_heap_roots.done(); |
4753 buf_scan_perm.done(); | |
3823
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|
4754 |
342 | 4755 double ext_roots_end = os::elapsedTime(); |
3823
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|
4756 |
342 | 4757 g1_policy()->reset_obj_copy_time(worker_i); |
3823
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diff
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|
4758 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
14a2fd14c0db
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|
4759 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4760 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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diff
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|
4761 |
342 | 4762 double ext_root_time_ms = |
4763 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
3823
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|
4764 |
342 | 4765 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4766 | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4767 // During conc marking we have to filter the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4768 // to make sure we remove any oops into the CSet (which will show up |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4769 // as implicitly live). |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4770 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4771 if (mark_in_progress()) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4772 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4773 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4774 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4775 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4776 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
342 | 4777 |
4778 // Now scan the complement of the collection set. | |
4779 if (scan_rs != NULL) { | |
4780 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4781 } | |
3823
14a2fd14c0db
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diff
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|
4782 |
342 | 4783 _process_strong_tasks->all_tasks_completed(); |
4784 } | |
4785 | |
4786 void | |
4787 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4788 OopClosure* non_root_closure) { | |
989
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6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4789 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4790 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4791 } |
4792 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
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|
4793 // Weak Reference Processing support |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4794 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4795 // An always "is_alive" closure that is used to preserve referents. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4796 // If the object is non-null then it's alive. Used in the preservation |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4797 // of referent objects that are pointed to by reference objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4798 // discovered by the CM ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4799 class G1AlwaysAliveClosure: public BoolObjectClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4800 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4801 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4802 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
4803 void do_object(oop p) { assert(false, "Do not call."); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4804 bool do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4805 if (p != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4806 return true; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4807 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4808 return false; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4809 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4810 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4811 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4812 bool G1STWIsAliveClosure::do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4813 // An object is reachable if it is outside the collection set, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
4814 // or is inside and copied. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4815 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
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|
4816 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4817 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4818 // Non Copying Keep Alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
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|
4819 class G1KeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4820 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4821 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4822 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4823 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4824 void do_oop( oop* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4825 oop obj = *p; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4826 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4827 if (_g1->obj_in_cs(obj)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4828 assert( obj->is_forwarded(), "invariant" ); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4829 *p = obj->forwardee(); |
4dfb2df418f2
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diff
changeset
|
4830 } |
4dfb2df418f2
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diff
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|
4831 } |
4dfb2df418f2
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diff
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|
4832 }; |
4dfb2df418f2
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diff
changeset
|
4833 |
4dfb2df418f2
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diff
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|
4834 // Copying Keep Alive closure - can be called from both |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4835 // serial and parallel code as long as different worker |
4dfb2df418f2
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3973
diff
changeset
|
4836 // threads utilize different G1ParScanThreadState instances |
4dfb2df418f2
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3973
diff
changeset
|
4837 // and different queues. |
4dfb2df418f2
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diff
changeset
|
4838 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4839 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4840 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4841 OopClosure* _copy_non_heap_obj_cl; |
4dfb2df418f2
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diff
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|
4842 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
4dfb2df418f2
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diff
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|
4843 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
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changeset
|
4844 |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4845 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4846 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
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parents:
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diff
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|
4847 OopClosure* non_heap_obj_cl, |
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6484982: G1: process references during evacuation pauses
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parents:
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|
4848 OopsInHeapRegionClosure* perm_obj_cl, |
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parents:
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diff
changeset
|
4849 G1ParScanThreadState* pss): |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4850 _g1h(g1h), |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4851 _copy_non_heap_obj_cl(non_heap_obj_cl), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4852 _copy_perm_obj_cl(perm_obj_cl), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4853 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4854 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4855 |
4dfb2df418f2
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parents:
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diff
changeset
|
4856 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
4dfb2df418f2
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parents:
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diff
changeset
|
4857 virtual void do_oop( oop* p) { do_oop_work(p); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4858 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4859 template <class T> void do_oop_work(T* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4860 oop obj = oopDesc::load_decode_heap_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4861 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4862 if (_g1h->obj_in_cs(obj)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4863 // If the referent object has been forwarded (either copied |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4864 // to a new location or to itself in the event of an |
4dfb2df418f2
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parents:
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diff
changeset
|
4865 // evacuation failure) then we need to update the reference |
4dfb2df418f2
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parents:
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diff
changeset
|
4866 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
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parents:
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diff
changeset
|
4867 // heap, update the RSet for the referent. |
4dfb2df418f2
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parents:
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diff
changeset
|
4868 // |
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parents:
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diff
changeset
|
4869 // If the referent has not been forwarded then we have to keep |
4dfb2df418f2
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parents:
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diff
changeset
|
4870 // it alive by policy. Therefore we have copy the referent. |
4dfb2df418f2
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parents:
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diff
changeset
|
4871 // |
4dfb2df418f2
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parents:
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diff
changeset
|
4872 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
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parents:
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diff
changeset
|
4873 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4874 // phase of reference processing) the object and it's followers |
4dfb2df418f2
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parents:
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diff
changeset
|
4875 // will be copied, the reference field set to point to the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4876 // new location, and the RSet updated. Otherwise we need to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4877 // use the the non-heap or perm closures directly to copy |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4878 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4879 // updating the RSet. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4880 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4881 if (_g1h->is_in_g1_reserved(p)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4882 _par_scan_state->push_on_queue(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4883 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
4884 // The reference field is not in the G1 heap. |
4dfb2df418f2
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parents:
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diff
changeset
|
4885 if (_g1h->perm_gen()->is_in(p)) { |
4dfb2df418f2
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parents:
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diff
changeset
|
4886 _copy_perm_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4887 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
4888 _copy_non_heap_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4889 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4890 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4891 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4892 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4893 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4894 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4895 // Serial drain queue closure. Called as the 'complete_gc' |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4896 // closure for each discovered list in some of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4897 // reference processing phases. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4898 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4899 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4900 protected: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4901 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4902 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
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parents:
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diff
changeset
|
4903 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4904 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
4dfb2df418f2
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parents:
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diff
changeset
|
4905 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4906 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4907 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4908 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4909 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4910 { } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4911 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4912 void do_void() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4913 G1ParScanThreadState* const pss = par_scan_state(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4914 pss->trim_queue(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4915 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4916 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4917 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4918 // Parallel Reference Processing closures |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4919 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4920 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4921 // processing during G1 evacuation pauses. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4922 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4923 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 private: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4925 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4926 RefToScanQueueSet* _queues; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4927 FlexibleWorkGang* _workers; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 int _active_workers; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4930 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4931 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4932 FlexibleWorkGang* workers, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4933 RefToScanQueueSet *task_queues, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 int n_workers) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4935 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4936 _queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4937 _workers(workers), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4938 _active_workers(n_workers) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4939 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4940 assert(n_workers > 0, "shouldn't call this otherwise"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4941 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4942 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4943 // Executes the given task using concurrent marking worker threads. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4944 virtual void execute(ProcessTask& task); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4945 virtual void execute(EnqueueTask& task); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4946 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4947 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4948 // Gang task for possibly parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4949 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4950 class G1STWRefProcTaskProxy: public AbstractGangTask { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4951 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4952 ProcessTask& _proc_task; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4953 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4954 RefToScanQueueSet *_task_queues; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4955 ParallelTaskTerminator* _terminator; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4956 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4957 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4958 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4959 G1CollectedHeap* g1h, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4960 RefToScanQueueSet *task_queues, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4961 ParallelTaskTerminator* terminator) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4962 AbstractGangTask("Process reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4963 _proc_task(proc_task), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4964 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4965 _task_queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4966 _terminator(terminator) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4967 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4968 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4969 virtual void work(uint worker_id) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4970 // The reference processing task executed by a single worker. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4971 ResourceMark rm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4972 HandleMark hm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4973 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4974 G1STWIsAliveClosure is_alive(_g1h); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4975 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4976 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4977 |
4dfb2df418f2
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4978 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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4979 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
4980 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
4981 |
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|
4982 pss.set_evac_closure(&scan_evac_cl); |
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|
4983 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
4984 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
4985 |
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|
4986 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
4987 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
4988 |
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|
4989 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
4990 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
4991 |
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|
4992 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
4993 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
4994 |
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|
4995 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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|
4996 // We also need to mark copied objects. |
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|
4997 copy_non_heap_cl = ©_mark_non_heap_cl; |
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4998 copy_perm_cl = ©_mark_perm_cl; |
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|
4999 } |
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|
5000 |
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|
5001 // Keep alive closure. |
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|
5002 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5003 |
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|
5004 // Complete GC closure |
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5005 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
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|
5006 |
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5007 // Call the reference processing task's work routine. |
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5008 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
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|
5009 |
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|
5010 // Note we cannot assert that the refs array is empty here as not all |
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|
5011 // of the processing tasks (specifically phase2 - pp2_work) execute |
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|
5012 // the complete_gc closure (which ordinarily would drain the queue) so |
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|
5013 // the queue may not be empty. |
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|
5014 } |
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|
5015 }; |
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|
5016 |
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|
5017 // Driver routine for parallel reference processing. |
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|
5018 // Creates an instance of the ref processing gang |
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|
5019 // task and has the worker threads execute it. |
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|
5020 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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|
5021 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5022 |
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|
5023 ParallelTaskTerminator terminator(_active_workers, _queues); |
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|
5024 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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|
5025 |
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|
5026 _g1h->set_par_threads(_active_workers); |
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|
5027 _workers->run_task(&proc_task_proxy); |
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|
5028 _g1h->set_par_threads(0); |
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|
5029 } |
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changeset
|
5030 |
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|
5031 // Gang task for parallel reference enqueueing. |
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|
5032 |
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|
5033 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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|
5034 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
5035 EnqueueTask& _enq_task; |
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|
5036 |
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|
5037 public: |
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|
5038 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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|
5039 AbstractGangTask("Enqueue reference objects in parallel"), |
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diff
changeset
|
5040 _enq_task(enq_task) |
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|
5041 { } |
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|
5042 |
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|
5043 virtual void work(uint worker_id) { |
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|
5044 _enq_task.work(worker_id); |
3979
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|
5045 } |
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|
5046 }; |
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changeset
|
5047 |
4dfb2df418f2
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|
5048 // Driver routine for parallel reference enqueing. |
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|
5049 // Creates an instance of the ref enqueueing gang |
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diff
changeset
|
5050 // task and has the worker threads execute it. |
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diff
changeset
|
5051 |
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|
5052 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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changeset
|
5053 assert(_workers != NULL, "Need parallel worker threads."); |
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changeset
|
5054 |
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|
5055 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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|
5056 |
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|
5057 _g1h->set_par_threads(_active_workers); |
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|
5058 _workers->run_task(&enq_task_proxy); |
4dfb2df418f2
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|
5059 _g1h->set_par_threads(0); |
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|
5060 } |
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diff
changeset
|
5061 |
4dfb2df418f2
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diff
changeset
|
5062 // End of weak reference support closures |
4dfb2df418f2
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diff
changeset
|
5063 |
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|
5064 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5065 // that are in the collection set and are pointed to by reference |
4dfb2df418f2
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|
5066 // objects discovered by the CM ref processor. |
4dfb2df418f2
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diff
changeset
|
5067 |
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diff
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|
5068 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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changeset
|
5069 protected: |
4dfb2df418f2
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diff
changeset
|
5070 G1CollectedHeap* _g1h; |
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diff
changeset
|
5071 RefToScanQueueSet *_queues; |
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|
5072 ParallelTaskTerminator _terminator; |
4728
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|
5073 uint _n_workers; |
3979
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changeset
|
5074 |
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diff
changeset
|
5075 public: |
4dfb2df418f2
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diff
changeset
|
5076 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
4dfb2df418f2
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|
5077 AbstractGangTask("ParPreserveCMReferents"), |
4dfb2df418f2
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|
5078 _g1h(g1h), |
4dfb2df418f2
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diff
changeset
|
5079 _queues(task_queues), |
4dfb2df418f2
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diff
changeset
|
5080 _terminator(workers, _queues), |
4dfb2df418f2
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diff
changeset
|
5081 _n_workers(workers) |
4dfb2df418f2
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diff
changeset
|
5082 { } |
4dfb2df418f2
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diff
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|
5083 |
4728
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|
5084 void work(uint worker_id) { |
3979
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changeset
|
5085 ResourceMark rm; |
4dfb2df418f2
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diff
changeset
|
5086 HandleMark hm; |
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diff
changeset
|
5087 |
4728
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diff
changeset
|
5088 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5089 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5090 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5091 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5092 |
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diff
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|
5093 pss.set_evac_closure(&scan_evac_cl); |
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changeset
|
5094 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5095 pss.set_partial_scan_closure(&partial_scan_cl); |
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diff
changeset
|
5096 |
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diff
changeset
|
5097 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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diff
changeset
|
5098 |
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diff
changeset
|
5099 |
4dfb2df418f2
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diff
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|
5100 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5101 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5102 |
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diff
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|
5103 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5104 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5105 |
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changeset
|
5106 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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5107 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5108 |
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|
5109 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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|
5110 // We also need to mark copied objects. |
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|
5111 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5112 copy_perm_cl = ©_mark_perm_cl; |
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6484982: G1: process references during evacuation pauses
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|
5113 } |
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diff
changeset
|
5114 |
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diff
changeset
|
5115 // Is alive closure |
4dfb2df418f2
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changeset
|
5116 G1AlwaysAliveClosure always_alive(_g1h); |
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|
5117 |
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|
5118 // Copying keep alive closure. Applied to referent objects that need |
4dfb2df418f2
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|
5119 // to be copied. |
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changeset
|
5120 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5121 |
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|
5122 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
5123 |
4728
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parents:
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|
5124 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
441e946dc1af
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|
5125 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
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|
5126 |
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|
5127 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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|
5128 // So this must be true - but assert just in case someone decides to |
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|
5129 // change the worker ids. |
4728
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jmasa
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|
5130 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
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|
5131 assert(!rp->discovery_is_atomic(), "check this code"); |
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|
5132 |
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|
5133 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
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|
5134 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
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|
5135 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
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|
5136 |
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|
5137 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
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|
5138 while (iter.has_next()) { |
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|
5139 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
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|
5140 // can see some null referent objects. |
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|
5141 iter.load_ptrs(DEBUG_ONLY(true)); |
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|
5142 oop ref = iter.obj(); |
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diff
changeset
|
5143 |
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diff
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|
5144 // This will filter nulls. |
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diff
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|
5145 if (iter.is_referent_alive()) { |
4dfb2df418f2
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|
5146 iter.make_referent_alive(); |
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parents:
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|
5147 } |
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|
5148 iter.move_to_next(); |
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diff
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|
5149 } |
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diff
changeset
|
5150 } |
4dfb2df418f2
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diff
changeset
|
5151 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5152 // Drain the queue - which may cause stealing |
4dfb2df418f2
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diff
changeset
|
5153 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
4dfb2df418f2
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|
5154 drain_queue.do_void(); |
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changeset
|
5155 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
4dfb2df418f2
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|
5156 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5157 } |
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parents:
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diff
changeset
|
5158 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
5159 |
4dfb2df418f2
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diff
changeset
|
5160 // Weak Reference processing during an evacuation pause (part 1). |
4dfb2df418f2
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diff
changeset
|
5161 void G1CollectedHeap::process_discovered_references() { |
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|
5162 double ref_proc_start = os::elapsedTime(); |
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|
5163 |
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diff
changeset
|
5164 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
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|
5165 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
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diff
changeset
|
5166 |
4dfb2df418f2
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diff
changeset
|
5167 // Any reference objects, in the collection set, that were 'discovered' |
4dfb2df418f2
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diff
changeset
|
5168 // by the CM ref processor should have already been copied (either by |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5169 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
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parents:
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diff
changeset
|
5170 // by following an RSet entry). |
4dfb2df418f2
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parents:
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diff
changeset
|
5171 // |
4dfb2df418f2
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diff
changeset
|
5172 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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diff
changeset
|
5173 // reference objects point to may not have been copied: the STW ref |
4dfb2df418f2
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parents:
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diff
changeset
|
5174 // processor would have seen that the reference object had already |
4dfb2df418f2
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diff
changeset
|
5175 // been 'discovered' and would have skipped discovering the reference, |
4dfb2df418f2
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diff
changeset
|
5176 // but would not have treated the reference object as a regular oop. |
4dfb2df418f2
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diff
changeset
|
5177 // As a reult the copy closure would not have been applied to the |
4dfb2df418f2
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parents:
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diff
changeset
|
5178 // referent object. |
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parents:
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diff
changeset
|
5179 // |
4dfb2df418f2
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parents:
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diff
changeset
|
5180 // We need to explicitly copy these referent objects - the references |
4dfb2df418f2
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parents:
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diff
changeset
|
5181 // will be processed at the end of remarking. |
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parents:
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diff
changeset
|
5182 // |
4dfb2df418f2
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parents:
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diff
changeset
|
5183 // We also need to do this copying before we process the reference |
4dfb2df418f2
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diff
changeset
|
5184 // objects discovered by the STW ref processor in case one of these |
4dfb2df418f2
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diff
changeset
|
5185 // referents points to another object which is also referenced by an |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5186 // object discovered by the STW ref processor. |
4dfb2df418f2
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parents:
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diff
changeset
|
5187 |
4728
441e946dc1af
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jmasa
parents:
4711
diff
changeset
|
5188 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5189 workers()->active_workers() : 1); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5190 |
4711 | 5191 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
5192 active_workers == workers()->active_workers(), | |
5193 "Need to reset active_workers"); | |
5194 | |
4095
bca17e38de00
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jmasa
parents:
4090
diff
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|
5195 set_par_threads(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5196 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5197 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5198 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
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diff
changeset
|
5199 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
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diff
changeset
|
5200 } else { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5201 keep_cm_referents.work(0); |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5202 } |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5203 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5204 set_par_threads(0); |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5205 |
4dfb2df418f2
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diff
changeset
|
5206 // Closure to test whether a referent is alive. |
4dfb2df418f2
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diff
changeset
|
5207 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5208 |
4dfb2df418f2
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3973
diff
changeset
|
5209 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
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3973
diff
changeset
|
5210 // of JNI refs is serial and performed serially by the current thread |
4dfb2df418f2
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diff
changeset
|
5211 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
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parents:
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diff
changeset
|
5212 // JNI refs. |
4dfb2df418f2
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parents:
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diff
changeset
|
5213 |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5214 // Use only a single queue for this PSS. |
4dfb2df418f2
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diff
changeset
|
5215 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
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diff
changeset
|
5216 |
4dfb2df418f2
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diff
changeset
|
5217 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
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parents:
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diff
changeset
|
5218 // closures while we're actually processing the discovered |
4dfb2df418f2
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diff
changeset
|
5219 // reference objects. |
4dfb2df418f2
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diff
changeset
|
5220 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
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diff
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|
5221 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
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diff
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|
5222 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5223 |
4dfb2df418f2
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diff
changeset
|
5224 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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diff
changeset
|
5225 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
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diff
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|
5226 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
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diff
changeset
|
5227 |
4dfb2df418f2
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diff
changeset
|
5228 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
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diff
changeset
|
5229 |
4dfb2df418f2
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diff
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|
5230 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5231 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5232 |
4dfb2df418f2
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diff
changeset
|
5233 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5234 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
4dfb2df418f2
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diff
changeset
|
5235 |
4dfb2df418f2
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diff
changeset
|
5236 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
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|
5237 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5238 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5242 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5244 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 // Keep alive closure. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 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
|
5247 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 // Serial Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5252 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5254 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5256 rp->process_discovered_references(&is_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 &keep_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 &drain_queue, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 // Parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5263 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5265 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 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
|
5267 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5272 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 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
|
5274 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 // Weak Reference processing during an evacuation pause (part 2). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 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
|
5285 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 // Parallel reference enqueuing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5294 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
|
5295 assert(active_workers == workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5296 "Need to reset active_workers"); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5297 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5298 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5299 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5300 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5301 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5304 rp->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5305 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5308 // 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
|
5309 // 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
|
5310 // and could signicantly increase the pause time. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5312 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5313 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5314 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5315 |
342 | 5316 void G1CollectedHeap::evacuate_collection_set() { |
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5317 _expand_heap_after_alloc_failure = true; |
342 | 5318 set_evacuation_failed(false); |
5319 | |
5320 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5321 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5322 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5323 | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5324 uint n_workers; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5325 if (G1CollectedHeap::use_parallel_gc_threads()) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5326 n_workers = |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5327 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5328 workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5329 Threads::number_of_non_daemon_threads()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5330 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5331 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5332 "If not dynamic should be using all the workers"); |
4711 | 5333 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5334 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5335 } else { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5336 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5337 "Should be the original non-parallel value"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5338 n_workers = 1; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5339 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5340 |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5341 G1ParTask g1_par_task(this, _task_queues); |
342 | 5342 |
5343 init_for_evac_failure(NULL); | |
5344 | |
5345 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5346 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5347 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 5348 double start_par = os::elapsedTime(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5349 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5350 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 5351 // The individual threads will set their evac-failure closures. |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5352 StrongRootsScope srs(this); |
1709 | 5353 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5354 // These tasks use ShareHeap::_process_strong_tasks |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5355 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5356 workers()->active_workers() == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5357 "If not dynamic should be using all the workers"); |
342 | 5358 workers()->run_task(&g1_par_task); |
5359 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5360 StrongRootsScope srs(this); |
4711 | 5361 g1_par_task.set_for_termination(n_workers); |
342 | 5362 g1_par_task.work(0); |
5363 } | |
5364 | |
5365 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
5366 g1_policy()->record_par_time(par_time); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5367 |
342 | 5368 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5369 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 // Process any discovered reference objects - we have |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 // to do this _before_ we retire the GC alloc regions |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5373 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5374 // not copied during the pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 process_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5377 // Weak root processing. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5378 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5379 // non-perm oops then we will need to process the code blobs |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5380 // here too. |
342 | 5381 { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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5382 G1STWIsAliveClosure is_alive(this); |
342 | 5383 G1KeepAliveClosure keep_alive(this); |
5384 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5385 } | |
3979
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5386 |
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5387 release_gc_alloc_regions(); |
342 | 5388 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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5389 |
889 | 5390 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5391 concurrent_g1_refine()->set_use_cache(true); |
5392 | |
5393 finalize_for_evac_failure(); | |
5394 | |
5395 if (evacuation_failed()) { | |
5396 remove_self_forwarding_pointers(); | |
5397 if (PrintGCDetails) { | |
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5398 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5399 } else if (PrintGC) { |
5400 gclog_or_tty->print("--"); | |
5401 } | |
5402 } | |
5403 | |
3979
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5404 // Enqueue any remaining references remaining on the STW |
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5405 // reference processor's discovered lists. We need to do |
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5406 // this after the card table is cleaned (and verified) as |
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5407 // the act of enqueuing entries on to the pending list |
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5408 // will log these updates (and dirty their associated |
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5409 // cards). We need these updates logged to update any |
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|
5410 // RSets. |
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5411 enqueue_discovered_references(); |
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5412 |
616
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5413 if (G1DeferredRSUpdate) { |
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5414 RedirtyLoggedCardTableEntryFastClosure redirty; |
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5415 dirty_card_queue_set().set_closure(&redirty); |
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5416 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5417 |
5418 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5419 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
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5420 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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5421 } |
342 | 5422 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5423 } | |
5424 | |
2173 | 5425 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5426 size_t* pre_used, |
5427 FreeRegionList* free_list, | |
4072 | 5428 OldRegionSet* old_proxy_set, |
2152 | 5429 HumongousRegionSet* humongous_proxy_set, |
2173 | 5430 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5431 bool par) { |
5432 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5433 if (hr->isHumongous()) { | |
5434 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5435 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5436 } else { | |
4072 | 5437 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5438 free_region(hr, pre_used, free_list, par); |
342 | 5439 } |
2173 | 5440 } else { |
5441 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5442 } |
5443 } | |
5444 | |
2152 | 5445 void G1CollectedHeap::free_region(HeapRegion* hr, |
5446 size_t* pre_used, | |
5447 FreeRegionList* free_list, | |
5448 bool par) { | |
5449 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5450 assert(!hr->is_empty(), "the region should not be empty"); | |
5451 assert(free_list != NULL, "pre-condition"); | |
5452 | |
5453 *pre_used += hr->used(); | |
5454 hr->hr_clear(par, true /* clear_space */); | |
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5455 free_list->add_as_head(hr); |
2152 | 5456 } |
5457 | |
5458 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5459 size_t* pre_used, | |
5460 FreeRegionList* free_list, | |
5461 HumongousRegionSet* humongous_proxy_set, | |
5462 bool par) { | |
5463 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5464 assert(free_list != NULL, "pre-condition"); | |
5465 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5466 | |
5467 size_t hr_used = hr->used(); | |
5468 size_t hr_capacity = hr->capacity(); | |
5469 size_t hr_pre_used = 0; | |
5470 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5471 hr->set_notHumongous(); | |
5472 free_region(hr, &hr_pre_used, free_list, par); | |
5473 | |
3766 | 5474 size_t i = hr->hrs_index() + 1; |
2152 | 5475 size_t num = 1; |
3766 | 5476 while (i < n_regions()) { |
5477 HeapRegion* curr_hr = region_at(i); | |
2152 | 5478 if (!curr_hr->continuesHumongous()) { |
5479 break; | |
5480 } | |
5481 curr_hr->set_notHumongous(); | |
5482 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5483 num += 1; | |
5484 i += 1; | |
5485 } | |
5486 assert(hr_pre_used == hr_used, | |
5487 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5488 "should be the same", hr_pre_used, hr_used)); | |
5489 *pre_used += hr_pre_used; | |
5490 } | |
5491 | |
5492 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5493 FreeRegionList* free_list, | |
4072 | 5494 OldRegionSet* old_proxy_set, |
2152 | 5495 HumongousRegionSet* humongous_proxy_set, |
5496 bool par) { | |
5497 if (pre_used > 0) { | |
5498 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5499 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5500 assert(_summary_bytes_used >= pre_used, |
5501 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5502 "should be >= pre_used: "SIZE_FORMAT, | |
5503 _summary_bytes_used, pre_used)); | |
342 | 5504 _summary_bytes_used -= pre_used; |
2152 | 5505 } |
5506 if (free_list != NULL && !free_list->is_empty()) { | |
5507 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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5508 _free_list.add_as_head(free_list); |
2152 | 5509 } |
4072 | 5510 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5511 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5512 _old_set.update_from_proxy(old_proxy_set); | |
5513 } | |
2152 | 5514 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5515 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5516 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5517 } |
5518 } | |
5519 | |
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5520 class G1ParCleanupCTTask : public AbstractGangTask { |
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5521 CardTableModRefBS* _ct_bs; |
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5522 G1CollectedHeap* _g1h; |
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5523 HeapRegion* volatile _su_head; |
796
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5524 public: |
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5525 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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5526 G1CollectedHeap* g1h) : |
796
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5527 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
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5528 _ct_bs(ct_bs), _g1h(g1h) { } |
796
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5529 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
5530 void work(uint worker_id) { |
796
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5531 HeapRegion* r; |
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5532 while (r = _g1h->pop_dirty_cards_region()) { |
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|
5533 clear_cards(r); |
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|
5534 } |
940
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|
5535 } |
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|
5536 |
796
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|
5537 void clear_cards(HeapRegion* r) { |
3830
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5538 // Cards of the survivors should have already been dirtied. |
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5539 if (!r->is_survivor()) { |
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5540 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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|
5541 } |
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|
5542 } |
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|
5543 }; |
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|
5544 |
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|
5545 #ifndef PRODUCT |
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5546 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
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5547 G1CollectedHeap* _g1h; |
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5548 CardTableModRefBS* _ct_bs; |
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5549 public: |
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5550 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
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5551 : _g1h(g1h), _ct_bs(ct_bs) { } |
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5552 virtual bool doHeapRegion(HeapRegion* r) { |
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5553 if (r->is_survivor()) { |
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5554 _g1h->verify_dirty_region(r); |
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5555 } else { |
3317
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|
5556 _g1h->verify_not_dirty_region(r); |
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|
5557 } |
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|
5558 return false; |
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|
5559 } |
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|
5560 }; |
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|
5561 |
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5562 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
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5563 // All of the region should be clean. |
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5564 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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5565 MemRegion mr(hr->bottom(), hr->end()); |
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5566 ct_bs->verify_not_dirty_region(mr); |
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5567 } |
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5568 |
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5569 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
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5570 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
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5571 // dirty allocated blocks as they allocate them. The thread that |
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5572 // retires each region and replaces it with a new one will do a |
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5573 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
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5574 // not dirty that area (one less thing to have to do while holding |
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5575 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
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5576 // is dirty. |
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5577 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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5578 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
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5579 ct_bs->verify_dirty_region(mr); |
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5580 } |
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5581 |
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5582 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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5583 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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5584 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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|
5585 verify_dirty_region(hr); |
2433
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|
5586 } |
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|
5587 } |
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|
5588 |
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|
5589 void G1CollectedHeap::verify_dirty_young_regions() { |
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5590 verify_dirty_young_list(_young_list->first_region()); |
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5591 verify_dirty_young_list(_young_list->first_survivor_region()); |
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|
5592 } |
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|
5593 #endif |
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|
5594 |
342 | 5595 void G1CollectedHeap::cleanUpCardTable() { |
5596 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5597 double start = os::elapsedTime(); | |
5598 | |
4023 | 5599 { |
5600 // Iterate over the dirty cards region list. | |
5601 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
5602 | |
4711 | 5603 if (G1CollectedHeap::use_parallel_gc_threads()) { |
5604 set_par_threads(); | |
4023 | 5605 workers()->run_task(&cleanup_task); |
5606 set_par_threads(0); | |
5607 } else { | |
5608 while (_dirty_cards_region_list) { | |
5609 HeapRegion* r = _dirty_cards_region_list; | |
5610 cleanup_task.clear_cards(r); | |
5611 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
5612 if (_dirty_cards_region_list == r) { | |
5613 // The last region. | |
5614 _dirty_cards_region_list = NULL; | |
5615 } | |
5616 r->set_next_dirty_cards_region(NULL); | |
796
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|
5617 } |
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|
5618 } |
4023 | 5619 #ifndef PRODUCT |
5620 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
5621 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
5622 heap_region_iterate(&cleanup_verifier); | |
5623 } | |
5624 #endif | |
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|
5625 } |
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5626 |
342 | 5627 double elapsed = os::elapsedTime() - start; |
3979
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|
5628 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
342 | 5629 } |
5630 | |
5631 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5632 size_t pre_used = 0; |
5633 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5634 | |
342 | 5635 double young_time_ms = 0.0; |
5636 double non_young_time_ms = 0.0; | |
5637 | |
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5638 // Since the collection set is a superset of the the young list, |
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5639 // all we need to do to clear the young list is clear its |
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5640 // head and length, and unlink any young regions in the code below |
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|
5641 _young_list->clear(); |
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|
5642 |
342 | 5643 G1CollectorPolicy* policy = g1_policy(); |
5644 | |
5645 double start_sec = os::elapsedTime(); | |
5646 bool non_young = true; | |
5647 | |
5648 HeapRegion* cur = cs_head; | |
5649 int age_bound = -1; | |
5650 size_t rs_lengths = 0; | |
5651 | |
5652 while (cur != NULL) { | |
2361 | 5653 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 5654 if (non_young) { |
5655 if (cur->is_young()) { | |
5656 double end_sec = os::elapsedTime(); | |
5657 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5658 non_young_time_ms += elapsed_ms; | |
5659 | |
5660 start_sec = os::elapsedTime(); | |
5661 non_young = false; | |
5662 } | |
5663 } else { | |
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|
5664 if (!cur->is_young()) { |
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|
5665 double end_sec = os::elapsedTime(); |
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5666 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
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|
5667 young_time_ms += elapsed_ms; |
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|
5668 |
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|
5669 start_sec = os::elapsedTime(); |
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|
5670 non_young = true; |
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|
5671 } |
342 | 5672 } |
5673 | |
5674 rs_lengths += cur->rem_set()->occupied(); | |
5675 | |
5676 HeapRegion* next = cur->next_in_collection_set(); | |
5677 assert(cur->in_collection_set(), "bad CS"); | |
5678 cur->set_next_in_collection_set(NULL); | |
5679 cur->set_in_collection_set(false); | |
5680 | |
5681 if (cur->is_young()) { | |
5682 int index = cur->young_index_in_cset(); | |
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|
5683 assert(index != -1, "invariant"); |
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5684 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
342 | 5685 size_t words_survived = _surviving_young_words[index]; |
5686 cur->record_surv_words_in_group(words_survived); | |
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|
5687 |
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|
5688 // At this point the we have 'popped' cur from the collection set |
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5689 // (linked via next_in_collection_set()) but it is still in the |
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|
5690 // young list (linked via next_young_region()). Clear the |
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|
5691 // _next_young_region field. |
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|
5692 cur->set_next_young_region(NULL); |
342 | 5693 } else { |
5694 int index = cur->young_index_in_cset(); | |
4090
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|
5695 assert(index == -1, "invariant"); |
342 | 5696 } |
5697 | |
5698 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5699 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5700 "invariant" ); | |
5701 | |
5702 if (!cur->evacuation_failed()) { | |
4097
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|
5703 MemRegion used_mr = cur->used_region(); |
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|
5704 |
342 | 5705 // And the region is empty. |
4097
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|
5706 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
dc467e8b2c5e
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|
5707 |
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|
5708 // If marking is in progress then clear any objects marked in |
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|
5709 // the current region. Note mark_in_progress() returns false, |
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|
5710 // even during an initial mark pause, until the set_marking_started() |
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|
5711 // call which takes place later in the pause. |
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|
5712 if (mark_in_progress()) { |
dc467e8b2c5e
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|
5713 assert(!g1_policy()->during_initial_mark_pause(), "sanity"); |
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|
5714 _cm->nextMarkBitMap()->clearRange(used_mr); |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5715 } |
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|
5716 |
2152 | 5717 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 5718 } else { |
5719 cur->uninstall_surv_rate_group(); | |
4090
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|
5720 if (cur->is_young()) { |
342 | 5721 cur->set_young_index_in_cset(-1); |
4090
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|
5722 } |
342 | 5723 cur->set_not_young(); |
5724 cur->set_evacuation_failed(false); | |
4072 | 5725 // The region is now considered to be old. |
5726 _old_set.add(cur); | |
342 | 5727 } |
5728 cur = next; | |
5729 } | |
5730 | |
5731 policy->record_max_rs_lengths(rs_lengths); | |
5732 policy->cset_regions_freed(); | |
5733 | |
5734 double end_sec = os::elapsedTime(); | |
5735 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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|
5736 |
dc467e8b2c5e
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diff
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|
5737 if (non_young) { |
342 | 5738 non_young_time_ms += elapsed_ms; |
4097
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diff
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|
5739 } else { |
342 | 5740 young_time_ms += elapsed_ms; |
4097
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|
5741 } |
342 | 5742 |
2152 | 5743 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 5744 NULL /* old_proxy_set */, |
2152 | 5745 NULL /* humongous_proxy_set */, |
5746 false /* par */); | |
342 | 5747 policy->record_young_free_cset_time_ms(young_time_ms); |
5748 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5749 } | |
5750 | |
1394
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|
5751 // This routine is similar to the above but does not record |
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|
5752 // any policy statistics or update free lists; we are abandoning |
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|
5753 // the current incremental collection set in preparation of a |
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|
5754 // full collection. After the full GC we will start to build up |
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|
5755 // the incremental collection set again. |
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|
5756 // This is only called when we're doing a full collection |
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|
5757 // and is immediately followed by the tearing down of the young list. |
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|
5758 |
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|
5759 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
1316cec51b4d
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|
5760 HeapRegion* cur = cs_head; |
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|
5761 |
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|
5762 while (cur != NULL) { |
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|
5763 HeapRegion* next = cur->next_in_collection_set(); |
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|
5764 assert(cur->in_collection_set(), "bad CS"); |
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|
5765 cur->set_next_in_collection_set(NULL); |
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|
5766 cur->set_in_collection_set(false); |
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|
5767 cur->set_young_index_in_cset(-1); |
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|
5768 cur = next; |
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|
5769 } |
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|
5770 } |
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|
5771 |
2152 | 5772 void G1CollectedHeap::set_free_regions_coming() { |
5773 if (G1ConcRegionFreeingVerbose) { | |
5774 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5775 "setting free regions coming"); | |
5776 } | |
5777 | |
5778 assert(!free_regions_coming(), "pre-condition"); | |
5779 _free_regions_coming = true; | |
342 | 5780 } |
5781 | |
2152 | 5782 void G1CollectedHeap::reset_free_regions_coming() { |
5783 { | |
5784 assert(free_regions_coming(), "pre-condition"); | |
5785 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5786 _free_regions_coming = false; | |
5787 SecondaryFreeList_lock->notify_all(); | |
5788 } | |
5789 | |
5790 if (G1ConcRegionFreeingVerbose) { | |
5791 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5792 "reset free regions coming"); | |
342 | 5793 } |
5794 } | |
5795 | |
2152 | 5796 void G1CollectedHeap::wait_while_free_regions_coming() { |
5797 // Most of the time we won't have to wait, so let's do a quick test | |
5798 // first before we take the lock. | |
5799 if (!free_regions_coming()) { | |
5800 return; | |
5801 } | |
5802 | |
5803 if (G1ConcRegionFreeingVerbose) { | |
5804 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5805 "waiting for free regions"); | |
342 | 5806 } |
5807 | |
5808 { | |
2152 | 5809 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5810 while (free_regions_coming()) { | |
5811 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5812 } |
2152 | 5813 } |
5814 | |
5815 if (G1ConcRegionFreeingVerbose) { | |
5816 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5817 "done waiting for free regions"); | |
5818 } | |
342 | 5819 } |
5820 | |
5821 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5822 assert(heap_lock_held_for_gc(), | |
5823 "the heap lock should already be held by or for this thread"); | |
5824 _young_list->push_region(hr); | |
5825 } | |
5826 | |
5827 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5828 private: | |
5829 bool _success; | |
5830 public: | |
5831 NoYoungRegionsClosure() : _success(true) { } | |
5832 bool doHeapRegion(HeapRegion* r) { | |
5833 if (r->is_young()) { | |
5834 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5835 r->bottom(), r->end()); | |
5836 _success = false; | |
5837 } | |
5838 return false; | |
5839 } | |
5840 bool success() { return _success; } | |
5841 }; | |
5842 | |
1394
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5843 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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|
5844 bool ret = _young_list->check_list_empty(check_sample); |
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|
5845 |
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|
5846 if (check_heap) { |
342 | 5847 NoYoungRegionsClosure closure; |
5848 heap_region_iterate(&closure); | |
5849 ret = ret && closure.success(); | |
5850 } | |
5851 | |
5852 return ret; | |
5853 } | |
5854 | |
4072 | 5855 class TearDownRegionSetsClosure : public HeapRegionClosure { |
5856 private: | |
5857 OldRegionSet *_old_set; | |
2152 | 5858 |
342 | 5859 public: |
4072 | 5860 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 5861 |
342 | 5862 bool doHeapRegion(HeapRegion* r) { |
4072 | 5863 if (r->is_empty()) { |
5864 // We ignore empty regions, we'll empty the free list afterwards | |
5865 } else if (r->is_young()) { | |
5866 // We ignore young regions, we'll empty the young list afterwards | |
5867 } else if (r->isHumongous()) { | |
5868 // We ignore humongous regions, we're not tearing down the | |
5869 // humongous region set | |
342 | 5870 } else { |
4072 | 5871 // The rest should be old |
5872 _old_set->remove(r); | |
342 | 5873 } |
5874 return false; | |
5875 } | |
5876 | |
4072 | 5877 ~TearDownRegionSetsClosure() { |
5878 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 5879 } |
342 | 5880 }; |
5881 | |
4072 | 5882 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
5883 assert_at_safepoint(true /* should_be_vm_thread */); | |
5884 | |
5885 if (!free_list_only) { | |
5886 TearDownRegionSetsClosure cl(&_old_set); | |
5887 heap_region_iterate(&cl); | |
5888 | |
5889 // Need to do this after the heap iteration to be able to | |
5890 // recognize the young regions and ignore them during the iteration. | |
5891 _young_list->empty_list(); | |
5892 } | |
5893 _free_list.remove_all(); | |
5894 } | |
5895 | |
5896 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
5897 private: | |
5898 bool _free_list_only; | |
5899 OldRegionSet* _old_set; | |
5900 FreeRegionList* _free_list; | |
5901 size_t _total_used; | |
5902 | |
5903 public: | |
5904 RebuildRegionSetsClosure(bool free_list_only, | |
5905 OldRegionSet* old_set, FreeRegionList* free_list) : | |
5906 _free_list_only(free_list_only), | |
5907 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
5908 assert(_free_list->is_empty(), "pre-condition"); | |
5909 if (!free_list_only) { | |
5910 assert(_old_set->is_empty(), "pre-condition"); | |
5911 } | |
5912 } | |
5913 | |
5914 bool doHeapRegion(HeapRegion* r) { | |
5915 if (r->continuesHumongous()) { | |
5916 return false; | |
5917 } | |
5918 | |
5919 if (r->is_empty()) { | |
5920 // Add free regions to the free list | |
5921 _free_list->add_as_tail(r); | |
5922 } else if (!_free_list_only) { | |
5923 assert(!r->is_young(), "we should not come across young regions"); | |
5924 | |
5925 if (r->isHumongous()) { | |
5926 // We ignore humongous regions, we left the humongous set unchanged | |
5927 } else { | |
5928 // The rest should be old, add them to the old set | |
5929 _old_set->add(r); | |
5930 } | |
5931 _total_used += r->used(); | |
5932 } | |
5933 | |
5934 return false; | |
5935 } | |
5936 | |
5937 size_t total_used() { | |
5938 return _total_used; | |
5939 } | |
5940 }; | |
5941 | |
5942 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
5943 assert_at_safepoint(true /* should_be_vm_thread */); | |
5944 | |
5945 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
5946 heap_region_iterate(&cl); | |
5947 | |
5948 if (!free_list_only) { | |
5949 _summary_bytes_used = cl.total_used(); | |
5950 } | |
5951 assert(_summary_bytes_used == recalculate_used(), | |
5952 err_msg("inconsistent _summary_bytes_used, " | |
5953 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
5954 _summary_bytes_used, recalculate_used())); | |
342 | 5955 } |
5956 | |
5957 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5958 _refine_cte_cl->set_concurrent(concurrent); | |
5959 } | |
5960 | |
5961 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5962 HeapRegion* hr = heap_region_containing(p); | |
5963 if (hr == NULL) { | |
5964 return is_in_permanent(p); | |
5965 } else { | |
5966 return hr->is_in(p); | |
5967 } | |
5968 } | |
2152 | 5969 |
3830
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5970 // Methods for the mutator alloc region |
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|
5971 |
2433
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|
5972 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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|
5973 bool force) { |
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|
5974 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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5975 assert(!force || g1_policy()->can_expand_young_list(), |
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5976 "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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|
5977 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
5978 if (force || !young_list_full) { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5979 HeapRegion* new_alloc_region = new_region(word_size, |
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|
5980 false /* do_expand */); |
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|
5981 if (new_alloc_region != NULL) { |
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|
5982 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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diff
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|
5983 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5984 return new_alloc_region; |
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|
5985 } |
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|
5986 } |
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|
5987 return NULL; |
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diff
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|
5988 } |
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|
5989 |
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|
5990 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
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|
5991 size_t allocated_bytes) { |
abdfc822206f
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diff
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|
5992 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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|
5993 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
abdfc822206f
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|
5994 |
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diff
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|
5995 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
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|
5996 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
3777
diff
changeset
|
5997 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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3979
diff
changeset
|
5998 // We update the eden sizes here, when the region is retired, |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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3979
diff
changeset
|
5999 // instead of when it's allocated, since this is the point that its |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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3979
diff
changeset
|
6000 // used space has been recored in _summary_bytes_used. |
8229bd737950
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parents:
3979
diff
changeset
|
6001 g1mm()->update_eden_size(); |
2433
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|
6002 } |
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|
6003 |
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|
6004 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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|
6005 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
6006 return _g1h->new_mutator_alloc_region(word_size, force); |
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|
6007 } |
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|
6008 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6009 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6010 // Don't change the number of workers. Use the value previously set |
bca17e38de00
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4090
diff
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|
6011 // in the workgroup. |
4711 | 6012 assert(G1CollectedHeap::use_parallel_gc_threads(), "shouldn't be here otherwise"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
6013 uint n_workers = workers()->active_workers(); |
4711 | 6014 assert(UseDynamicNumberOfGCThreads || |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
4090
diff
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|
6015 n_workers == workers()->total_workers(), |
bca17e38de00
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4090
diff
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|
6016 "Otherwise should be using the total number of workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
6017 if (n_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6018 assert(false, "Should have been set in prior evacuation pause."); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
6019 n_workers = ParallelGCThreads; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
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|
6020 workers()->set_active_workers(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6021 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
6022 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
6023 } |
bca17e38de00
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4090
diff
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|
6024 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6025 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
6026 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6027 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6028 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6029 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
6030 // Methods for the GC alloc regions |
f44782f04dd4
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|
6031 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6032 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6033 size_t count, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6034 GCAllocPurpose ap) { |
f44782f04dd4
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|
6035 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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|
6036 |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6037 if (count < g1_policy()->max_regions(ap)) { |
f44782f04dd4
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|
6038 HeapRegion* new_alloc_region = new_region(word_size, |
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|
6039 true /* do_expand */); |
f44782f04dd4
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|
6040 if (new_alloc_region != NULL) { |
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|
6041 // We really only need to do this for old regions given that we |
f44782f04dd4
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|
6042 // should never scan survivors. But it doesn't hurt to do it |
f44782f04dd4
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diff
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|
6043 // for survivors too. |
f44782f04dd4
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|
6044 new_alloc_region->set_saved_mark(); |
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|
6045 if (ap == GCAllocForSurvived) { |
f44782f04dd4
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|
6046 new_alloc_region->set_survivor(); |
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|
6047 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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|
6048 } else { |
f44782f04dd4
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|
6049 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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|
6050 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
6051 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
6052 new_alloc_region->note_start_of_copying(during_im); |
3830
f44782f04dd4
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|
6053 return new_alloc_region; |
f44782f04dd4
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diff
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|
6054 } else { |
f44782f04dd4
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changeset
|
6055 g1_policy()->note_alloc_region_limit_reached(ap); |
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|
6056 } |
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changeset
|
6057 } |
f44782f04dd4
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|
6058 return NULL; |
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changeset
|
6059 } |
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changeset
|
6060 |
f44782f04dd4
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|
6061 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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|
6062 size_t allocated_bytes, |
f44782f04dd4
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diff
changeset
|
6063 GCAllocPurpose ap) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
6064 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
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4785
diff
changeset
|
6065 alloc_region->note_end_of_copying(during_im); |
3830
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6066 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6067 if (ap == GCAllocForSurvived) { |
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6068 young_list()->add_survivor_region(alloc_region); |
4072 | 6069 } else { |
6070 _old_set.add(alloc_region); | |
3830
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6071 } |
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6072 _hr_printer.retire(alloc_region); |
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6073 } |
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6074 |
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6075 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6076 bool force) { |
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6077 assert(!force, "not supported for GC alloc regions"); |
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6078 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6079 } |
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6080 |
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6081 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6082 size_t allocated_bytes) { |
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6083 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6084 GCAllocForSurvived); |
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6085 } |
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6086 |
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6087 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6088 bool force) { |
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6089 assert(!force, "not supported for GC alloc regions"); |
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6090 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6091 } |
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6092 |
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6093 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6094 size_t allocated_bytes) { |
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6095 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6096 GCAllocForTenured); |
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6097 } |
2433
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6098 // Heap region set verification |
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6099 |
2152 | 6100 class VerifyRegionListsClosure : public HeapRegionClosure { |
6101 private: | |
4072 | 6102 FreeRegionList* _free_list; |
6103 OldRegionSet* _old_set; | |
2152 | 6104 HumongousRegionSet* _humongous_set; |
6105 size_t _region_count; | |
6106 | |
6107 public: | |
4072 | 6108 VerifyRegionListsClosure(OldRegionSet* old_set, |
6109 HumongousRegionSet* humongous_set, | |
2152 | 6110 FreeRegionList* free_list) : |
4072 | 6111 _old_set(old_set), _humongous_set(humongous_set), |
6112 _free_list(free_list), _region_count(0) { } | |
2152 | 6113 |
6114 size_t region_count() { return _region_count; } | |
6115 | |
6116 bool doHeapRegion(HeapRegion* hr) { | |
6117 _region_count += 1; | |
6118 | |
6119 if (hr->continuesHumongous()) { | |
6120 return false; | |
6121 } | |
6122 | |
6123 if (hr->is_young()) { | |
6124 // TODO | |
6125 } else if (hr->startsHumongous()) { | |
6126 _humongous_set->verify_next_region(hr); | |
6127 } else if (hr->is_empty()) { | |
6128 _free_list->verify_next_region(hr); | |
4072 | 6129 } else { |
6130 _old_set->verify_next_region(hr); | |
2152 | 6131 } |
6132 return false; | |
6133 } | |
6134 }; | |
6135 | |
3766 | 6136 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
6137 HeapWord* bottom) { | |
6138 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6139 MemRegion mr(bottom, end); | |
6140 assert(_g1_reserved.contains(mr), "invariant"); | |
6141 // This might return NULL if the allocation fails | |
6142 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
6143 } | |
6144 | |
2152 | 6145 void G1CollectedHeap::verify_region_sets() { |
6146 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6147 | |
6148 // First, check the explicit lists. | |
6149 _free_list.verify(); | |
6150 { | |
6151 // Given that a concurrent operation might be adding regions to | |
6152 // the secondary free list we have to take the lock before | |
6153 // verifying it. | |
6154 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6155 _secondary_free_list.verify(); | |
6156 } | |
4072 | 6157 _old_set.verify(); |
2152 | 6158 _humongous_set.verify(); |
6159 | |
6160 // If a concurrent region freeing operation is in progress it will | |
6161 // be difficult to correctly attributed any free regions we come | |
6162 // across to the correct free list given that they might belong to | |
6163 // one of several (free_list, secondary_free_list, any local lists, | |
6164 // etc.). So, if that's the case we will skip the rest of the | |
6165 // verification operation. Alternatively, waiting for the concurrent | |
6166 // operation to complete will have a non-trivial effect on the GC's | |
6167 // operation (no concurrent operation will last longer than the | |
6168 // interval between two calls to verification) and it might hide | |
6169 // any issues that we would like to catch during testing. | |
6170 if (free_regions_coming()) { | |
6171 return; | |
6172 } | |
6173 | |
2361 | 6174 // Make sure we append the secondary_free_list on the free_list so |
6175 // that all free regions we will come across can be safely | |
6176 // attributed to the free_list. | |
6177 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6178 |
6179 // Finally, make sure that the region accounting in the lists is | |
6180 // consistent with what we see in the heap. | |
4072 | 6181 _old_set.verify_start(); |
2152 | 6182 _humongous_set.verify_start(); |
6183 _free_list.verify_start(); | |
6184 | |
4072 | 6185 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6186 heap_region_iterate(&cl); |
6187 | |
4072 | 6188 _old_set.verify_end(); |
2152 | 6189 _humongous_set.verify_end(); |
6190 _free_list.verify_end(); | |
342 | 6191 } |