Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4982:38012b8c29b1
create separate RUNTIME1_STUBS definition for non-graal build.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 27 Feb 2012 22:18:57 +0100 |
parents | a9647476d1a4 |
children | 64bf7c8270cb |
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 |
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177 YoungList::YoungList(G1CollectedHeap* g1h) : |
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178 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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179 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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180 guarantee(check_list_empty(false), "just making sure..."); |
342 | 181 } |
182 | |
183 void YoungList::push_region(HeapRegion *hr) { | |
184 assert(!hr->is_young(), "should not already be young"); | |
185 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
186 | |
187 hr->set_next_young_region(_head); | |
188 _head = hr; | |
189 | |
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190 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 191 ++_length; |
192 } | |
193 | |
194 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 195 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 196 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
197 | |
198 hr->set_next_young_region(_survivor_head); | |
199 if (_survivor_head == NULL) { | |
545 | 200 _survivor_tail = hr; |
342 | 201 } |
202 _survivor_head = hr; | |
203 ++_survivor_length; | |
204 } | |
205 | |
206 void YoungList::empty_list(HeapRegion* list) { | |
207 while (list != NULL) { | |
208 HeapRegion* next = list->get_next_young_region(); | |
209 list->set_next_young_region(NULL); | |
210 list->uninstall_surv_rate_group(); | |
211 list->set_not_young(); | |
212 list = next; | |
213 } | |
214 } | |
215 | |
216 void YoungList::empty_list() { | |
217 assert(check_list_well_formed(), "young list should be well formed"); | |
218 | |
219 empty_list(_head); | |
220 _head = NULL; | |
221 _length = 0; | |
222 | |
223 empty_list(_survivor_head); | |
224 _survivor_head = NULL; | |
545 | 225 _survivor_tail = NULL; |
342 | 226 _survivor_length = 0; |
227 | |
228 _last_sampled_rs_lengths = 0; | |
229 | |
230 assert(check_list_empty(false), "just making sure..."); | |
231 } | |
232 | |
233 bool YoungList::check_list_well_formed() { | |
234 bool ret = true; | |
235 | |
236 size_t length = 0; | |
237 HeapRegion* curr = _head; | |
238 HeapRegion* last = NULL; | |
239 while (curr != NULL) { | |
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240 if (!curr->is_young()) { |
342 | 241 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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242 "incorrectly tagged (y: %d, surv: %d)", |
342 | 243 curr->bottom(), curr->end(), |
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244 curr->is_young(), curr->is_survivor()); |
342 | 245 ret = false; |
246 } | |
247 ++length; | |
248 last = curr; | |
249 curr = curr->get_next_young_region(); | |
250 } | |
251 ret = ret && (length == _length); | |
252 | |
253 if (!ret) { | |
254 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
255 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
256 length, _length); | |
257 } | |
258 | |
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259 return ret; |
342 | 260 } |
261 | |
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262 bool YoungList::check_list_empty(bool check_sample) { |
342 | 263 bool ret = true; |
264 | |
265 if (_length != 0) { | |
266 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
267 _length); | |
268 ret = false; | |
269 } | |
270 if (check_sample && _last_sampled_rs_lengths != 0) { | |
271 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
272 ret = false; | |
273 } | |
274 if (_head != NULL) { | |
275 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
276 ret = false; | |
277 } | |
278 if (!ret) { | |
279 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
280 } | |
281 | |
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282 return ret; |
342 | 283 } |
284 | |
285 void | |
286 YoungList::rs_length_sampling_init() { | |
287 _sampled_rs_lengths = 0; | |
288 _curr = _head; | |
289 } | |
290 | |
291 bool | |
292 YoungList::rs_length_sampling_more() { | |
293 return _curr != NULL; | |
294 } | |
295 | |
296 void | |
297 YoungList::rs_length_sampling_next() { | |
298 assert( _curr != NULL, "invariant" ); | |
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299 size_t rs_length = _curr->rem_set()->occupied(); |
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300 |
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301 _sampled_rs_lengths += rs_length; |
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302 |
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303 // The current region may not yet have been added to the |
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304 // incremental collection set (it gets added when it is |
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305 // retired as the current allocation region). |
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306 if (_curr->in_collection_set()) { |
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307 // Update the collection set policy information for this region |
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308 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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309 } |
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310 |
342 | 311 _curr = _curr->get_next_young_region(); |
312 if (_curr == NULL) { | |
313 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
314 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
315 } | |
316 } | |
317 | |
318 void | |
319 YoungList::reset_auxilary_lists() { | |
320 guarantee( is_empty(), "young list should be empty" ); | |
321 assert(check_list_well_formed(), "young list should be well formed"); | |
322 | |
323 // Add survivor regions to SurvRateGroup. | |
324 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 325 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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326 |
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327 int young_index_in_cset = 0; |
342 | 328 for (HeapRegion* curr = _survivor_head; |
329 curr != NULL; | |
330 curr = curr->get_next_young_region()) { | |
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331 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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332 |
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333 // The region is a non-empty survivor so let's add it to |
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334 // the incremental collection set for the next evacuation |
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335 // pause. |
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336 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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337 young_index_in_cset += 1; |
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338 } |
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339 assert((size_t) young_index_in_cset == _survivor_length, |
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340 "post-condition"); |
342 | 341 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
342 | |
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343 _head = _survivor_head; |
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344 _length = _survivor_length; |
342 | 345 if (_survivor_head != NULL) { |
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346 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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347 assert(_survivor_length > 0, "invariant"); |
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348 _survivor_tail->set_next_young_region(NULL); |
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349 } |
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350 |
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351 // Don't clear the survivor list handles until the start of |
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352 // the next evacuation pause - we need it in order to re-tag |
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353 // the survivor regions from this evacuation pause as 'young' |
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354 // at the start of the next. |
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355 |
545 | 356 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 357 |
358 assert(check_list_well_formed(), "young list should be well formed"); | |
359 } | |
360 | |
361 void YoungList::print() { | |
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362 HeapRegion* lists[] = {_head, _survivor_head}; |
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363 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 364 |
365 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
366 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
367 HeapRegion *curr = lists[list]; | |
368 if (curr == NULL) | |
369 gclog_or_tty->print_cr(" empty"); | |
370 while (curr != NULL) { | |
371 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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372 "age: %4d, y: %d, surv: %d", |
342 | 373 curr->bottom(), curr->end(), |
374 curr->top(), | |
375 curr->prev_top_at_mark_start(), | |
376 curr->next_top_at_mark_start(), | |
377 curr->top_at_conc_mark_count(), | |
378 curr->age_in_surv_rate_group_cond(), | |
379 curr->is_young(), | |
380 curr->is_survivor()); | |
381 curr = curr->get_next_young_region(); | |
382 } | |
383 } | |
384 | |
385 gclog_or_tty->print_cr(""); | |
386 } | |
387 | |
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388 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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389 { |
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390 // Claim the right to put the region on the dirty cards region list |
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391 // by installing a self pointer. |
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392 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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393 if (next == NULL) { |
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394 HeapRegion* res = (HeapRegion*) |
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395 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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396 NULL); |
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397 if (res == NULL) { |
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398 HeapRegion* head; |
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399 do { |
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400 // Put the region to the dirty cards region list. |
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401 head = _dirty_cards_region_list; |
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402 next = (HeapRegion*) |
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403 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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404 if (next == head) { |
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405 assert(hr->get_next_dirty_cards_region() == hr, |
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406 "hr->get_next_dirty_cards_region() != hr"); |
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407 if (next == NULL) { |
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408 // The last region in the list points to itself. |
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409 hr->set_next_dirty_cards_region(hr); |
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410 } else { |
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411 hr->set_next_dirty_cards_region(next); |
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412 } |
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413 } |
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414 } while (next != head); |
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415 } |
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416 } |
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417 } |
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418 |
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419 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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420 { |
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421 HeapRegion* head; |
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422 HeapRegion* hr; |
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423 do { |
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424 head = _dirty_cards_region_list; |
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425 if (head == NULL) { |
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426 return NULL; |
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427 } |
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428 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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429 if (head == new_head) { |
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430 // The last region. |
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431 new_head = NULL; |
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432 } |
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433 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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434 head); |
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435 } while (hr != head); |
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436 assert(hr != NULL, "invariant"); |
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437 hr->set_next_dirty_cards_region(NULL); |
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438 return hr; |
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439 } |
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440 |
342 | 441 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 442 _cg1r->stop(); |
342 | 443 _cmThread->stop(); |
444 } | |
445 | |
3377
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446 #ifdef ASSERT |
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447 // A region is added to the collection set as it is retired |
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448 // so an address p can point to a region which will be in the |
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449 // collection set but has not yet been retired. This method |
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450 // therefore is only accurate during a GC pause after all |
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451 // regions have been retired. It is used for debugging |
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452 // to check if an nmethod has references to objects that can |
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453 // be move during a partial collection. Though it can be |
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454 // inaccurate, it is sufficient for G1 because the conservative |
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455 // implementation of is_scavengable() for G1 will indicate that |
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456 // all nmethods must be scanned during a partial collection. |
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457 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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458 HeapRegion* hr = heap_region_containing(p); |
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459 return hr != NULL && hr->in_collection_set(); |
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460 } |
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461 #endif |
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462 |
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463 // Returns true if the reference points to an object that |
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464 // can move in an incremental collecction. |
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465 bool G1CollectedHeap::is_scavengable(const void* p) { |
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466 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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467 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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468 HeapRegion* hr = heap_region_containing(p); |
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469 if (hr == NULL) { |
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470 // perm gen (or null) |
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471 return false; |
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472 } else { |
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473 return !hr->isHumongous(); |
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474 } |
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475 } |
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476 |
342 | 477 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
478 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
479 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
480 | |
481 // Count the dirty cards at the start. | |
482 CountNonCleanMemRegionClosure count1(this); | |
483 ct_bs->mod_card_iterate(&count1); | |
484 int orig_count = count1.n(); | |
485 | |
486 // First clear the logged cards. | |
487 ClearLoggedCardTableEntryClosure clear; | |
488 dcqs.set_closure(&clear); | |
489 dcqs.apply_closure_to_all_completed_buffers(); | |
490 dcqs.iterate_closure_all_threads(false); | |
491 clear.print_histo(); | |
492 | |
493 // Now ensure that there's no dirty cards. | |
494 CountNonCleanMemRegionClosure count2(this); | |
495 ct_bs->mod_card_iterate(&count2); | |
496 if (count2.n() != 0) { | |
497 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
498 count2.n(), orig_count); | |
499 } | |
500 guarantee(count2.n() == 0, "Card table should be clean."); | |
501 | |
502 RedirtyLoggedCardTableEntryClosure redirty; | |
503 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
504 dcqs.apply_closure_to_all_completed_buffers(); | |
505 dcqs.iterate_closure_all_threads(false); | |
506 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
507 clear.calls(), orig_count); | |
508 guarantee(redirty.calls() == clear.calls(), | |
509 "Or else mechanism is broken."); | |
510 | |
511 CountNonCleanMemRegionClosure count3(this); | |
512 ct_bs->mod_card_iterate(&count3); | |
513 if (count3.n() != orig_count) { | |
514 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
515 orig_count, count3.n()); | |
516 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
517 } | |
518 | |
519 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
520 } | |
521 | |
522 // Private class members. | |
523 | |
524 G1CollectedHeap* G1CollectedHeap::_g1h; | |
525 | |
526 // Private methods. | |
527 | |
2152 | 528 HeapRegion* |
2361 | 529 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 530 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
531 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
532 if (!_secondary_free_list.is_empty()) { | |
533 if (G1ConcRegionFreeingVerbose) { | |
534 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
535 "secondary_free_list has "SIZE_FORMAT" entries", | |
536 _secondary_free_list.length()); | |
537 } | |
538 // It looks as if there are free regions available on the | |
539 // secondary_free_list. Let's move them to the free_list and try | |
540 // again to allocate from it. | |
541 append_secondary_free_list(); | |
542 | |
543 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
544 "empty we should have moved at least one entry to the free_list"); | |
545 HeapRegion* res = _free_list.remove_head(); | |
546 if (G1ConcRegionFreeingVerbose) { | |
547 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
548 "allocated "HR_FORMAT" from secondary_free_list", | |
549 HR_FORMAT_PARAMS(res)); | |
550 } | |
551 return res; | |
552 } | |
553 | |
554 // Wait here until we get notifed either when (a) there are no | |
555 // more free regions coming or (b) some regions have been moved on | |
556 // the secondary_free_list. | |
557 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
558 } | |
559 | |
560 if (G1ConcRegionFreeingVerbose) { | |
561 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
562 "could not allocate from secondary_free_list"); | |
563 } | |
564 return NULL; | |
565 } | |
566 | |
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567 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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568 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 569 "the only time we use this to allocate a humongous region is " |
570 "when we are allocating a single humongous region"); | |
571 | |
572 HeapRegion* res; | |
573 if (G1StressConcRegionFreeing) { | |
574 if (!_secondary_free_list.is_empty()) { | |
575 if (G1ConcRegionFreeingVerbose) { | |
576 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
577 "forced to look at the secondary_free_list"); | |
578 } | |
2361 | 579 res = new_region_try_secondary_free_list(); |
2152 | 580 if (res != NULL) { |
581 return res; | |
582 } | |
583 } | |
584 } | |
585 res = _free_list.remove_head_or_null(); | |
586 if (res == NULL) { | |
587 if (G1ConcRegionFreeingVerbose) { | |
588 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
589 "res == NULL, trying the secondary_free_list"); | |
590 } | |
2361 | 591 res = new_region_try_secondary_free_list(); |
2152 | 592 } |
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593 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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594 // Currently, only attempts to allocate GC alloc regions set |
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595 // do_expand to true. So, we should only reach here during a |
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596 // safepoint. If this assumption changes we might have to |
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597 // reconsider the use of _expand_heap_after_alloc_failure. |
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598 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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599 |
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600 ergo_verbose1(ErgoHeapSizing, |
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601 "attempt heap expansion", |
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602 ergo_format_reason("region allocation request failed") |
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603 ergo_format_byte("allocation request"), |
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604 word_size * HeapWordSize); |
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605 if (expand(word_size * HeapWordSize)) { |
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606 // Given that expand() succeeded in expanding the heap, and we |
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607 // always expand the heap by an amount aligned to the heap |
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608 // region size, the free list should in theory not be empty. So |
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609 // it would probably be OK to use remove_head(). But the extra |
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610 // check for NULL is unlikely to be a performance issue here (we |
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611 // just expanded the heap!) so let's just be conservative and |
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612 // use remove_head_or_null(). |
3766 | 613 res = _free_list.remove_head_or_null(); |
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614 } else { |
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615 _expand_heap_after_alloc_failure = false; |
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616 } |
342 | 617 } |
618 return res; | |
619 } | |
620 | |
3766 | 621 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
622 size_t word_size) { | |
2361 | 623 assert(isHumongous(word_size), "word_size should be humongous"); |
624 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
625 | |
3766 | 626 size_t first = G1_NULL_HRS_INDEX; |
2152 | 627 if (num_regions == 1) { |
628 // Only one region to allocate, no need to go through the slower | |
629 // path. The caller will attempt the expasion if this fails, so | |
630 // let's not try to expand here too. | |
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631 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 632 if (hr != NULL) { |
633 first = hr->hrs_index(); | |
634 } else { | |
3766 | 635 first = G1_NULL_HRS_INDEX; |
2152 | 636 } |
637 } else { | |
638 // We can't allocate humongous regions while cleanupComplete() is | |
639 // running, since some of the regions we find to be empty might not | |
640 // yet be added to the free list and it is not straightforward to | |
641 // know which list they are on so that we can remove them. Note | |
642 // that we only need to do this if we need to allocate more than | |
643 // one region to satisfy the current humongous allocation | |
644 // request. If we are only allocating one region we use the common | |
645 // region allocation code (see above). | |
646 wait_while_free_regions_coming(); | |
2361 | 647 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 648 |
649 if (free_regions() >= num_regions) { | |
3766 | 650 first = _hrs.find_contiguous(num_regions); |
651 if (first != G1_NULL_HRS_INDEX) { | |
652 for (size_t i = first; i < first + num_regions; ++i) { | |
653 HeapRegion* hr = region_at(i); | |
2152 | 654 assert(hr->is_empty(), "sanity"); |
2361 | 655 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 656 hr->set_pending_removal(true); |
657 } | |
658 _free_list.remove_all_pending(num_regions); | |
659 } | |
660 } | |
661 } | |
662 return first; | |
663 } | |
664 | |
2361 | 665 HeapWord* |
3766 | 666 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 667 size_t num_regions, |
668 size_t word_size) { | |
3766 | 669 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 670 assert(isHumongous(word_size), "word_size should be humongous"); |
671 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
672 | |
673 // Index of last region in the series + 1. | |
3766 | 674 size_t last = first + num_regions; |
2361 | 675 |
676 // We need to initialize the region(s) we just discovered. This is | |
677 // a bit tricky given that it can happen concurrently with | |
678 // refinement threads refining cards on these regions and | |
679 // potentially wanting to refine the BOT as they are scanning | |
680 // those cards (this can happen shortly after a cleanup; see CR | |
681 // 6991377). So we have to set up the region(s) carefully and in | |
682 // a specific order. | |
683 | |
684 // The word size sum of all the regions we will allocate. | |
685 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
686 assert(word_size <= word_size_sum, "sanity"); | |
687 | |
688 // This will be the "starts humongous" region. | |
3766 | 689 HeapRegion* first_hr = region_at(first); |
2361 | 690 // The header of the new object will be placed at the bottom of |
691 // the first region. | |
692 HeapWord* new_obj = first_hr->bottom(); | |
693 // This will be the new end of the first region in the series that | |
694 // should also match the end of the last region in the seriers. | |
695 HeapWord* new_end = new_obj + word_size_sum; | |
696 // This will be the new top of the first region that will reflect | |
697 // this allocation. | |
698 HeapWord* new_top = new_obj + word_size; | |
699 | |
700 // First, we need to zero the header of the space that we will be | |
701 // allocating. When we update top further down, some refinement | |
702 // threads might try to scan the region. By zeroing the header we | |
703 // ensure that any thread that will try to scan the region will | |
704 // come across the zero klass word and bail out. | |
705 // | |
706 // NOTE: It would not have been correct to have used | |
707 // CollectedHeap::fill_with_object() and make the space look like | |
708 // an int array. The thread that is doing the allocation will | |
709 // later update the object header to a potentially different array | |
710 // type and, for a very short period of time, the klass and length | |
711 // fields will be inconsistent. This could cause a refinement | |
712 // thread to calculate the object size incorrectly. | |
713 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
714 | |
715 // We will set up the first region as "starts humongous". This | |
716 // will also update the BOT covering all the regions to reflect | |
717 // that there is a single object that starts at the bottom of the | |
718 // first region. | |
719 first_hr->set_startsHumongous(new_top, new_end); | |
720 | |
721 // Then, if there are any, we will set up the "continues | |
722 // humongous" regions. | |
723 HeapRegion* hr = NULL; | |
3766 | 724 for (size_t i = first + 1; i < last; ++i) { |
725 hr = region_at(i); | |
2361 | 726 hr->set_continuesHumongous(first_hr); |
727 } | |
728 // If we have "continues humongous" regions (hr != NULL), then the | |
729 // end of the last one should match new_end. | |
730 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
731 | |
732 // Up to this point no concurrent thread would have been able to | |
733 // do any scanning on any region in this series. All the top | |
734 // fields still point to bottom, so the intersection between | |
735 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
736 // update the top fields, we'll do a storestore to make sure that | |
737 // no thread sees the update to top before the zeroing of the | |
738 // object header and the BOT initialization. | |
739 OrderAccess::storestore(); | |
740 | |
741 // Now that the BOT and the object header have been initialized, | |
742 // we can update top of the "starts humongous" region. | |
743 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
744 "new_top should be in this region"); | |
745 first_hr->set_top(new_top); | |
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746 if (_hr_printer.is_active()) { |
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747 HeapWord* bottom = first_hr->bottom(); |
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748 HeapWord* end = first_hr->orig_end(); |
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749 if ((first + 1) == last) { |
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750 // the series has a single humongous region |
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751 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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752 } else { |
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753 // the series has more than one humongous regions |
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754 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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755 } |
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756 } |
2361 | 757 |
758 // Now, we will update the top fields of the "continues humongous" | |
759 // regions. The reason we need to do this is that, otherwise, | |
760 // these regions would look empty and this will confuse parts of | |
761 // G1. For example, the code that looks for a consecutive number | |
762 // of empty regions will consider them empty and try to | |
763 // re-allocate them. We can extend is_empty() to also include | |
764 // !continuesHumongous(), but it is easier to just update the top | |
765 // fields here. The way we set top for all regions (i.e., top == | |
766 // end for all regions but the last one, top == new_top for the | |
767 // last one) is actually used when we will free up the humongous | |
768 // region in free_humongous_region(). | |
769 hr = NULL; | |
3766 | 770 for (size_t i = first + 1; i < last; ++i) { |
771 hr = region_at(i); | |
2361 | 772 if ((i + 1) == last) { |
773 // last continues humongous region | |
774 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
775 "new_top should fall on this region"); | |
776 hr->set_top(new_top); | |
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777 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 778 } else { |
779 // not last one | |
780 assert(new_top > hr->end(), "new_top should be above this region"); | |
781 hr->set_top(hr->end()); | |
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782 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 783 } |
784 } | |
785 // If we have continues humongous regions (hr != NULL), then the | |
786 // end of the last one should match new_end and its top should | |
787 // match new_top. | |
788 assert(hr == NULL || | |
789 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
790 | |
791 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
792 _summary_bytes_used += first_hr->used(); | |
793 _humongous_set.add(first_hr); | |
794 | |
795 return new_obj; | |
796 } | |
797 | |
342 | 798 // If could fit into free regions w/o expansion, try. |
799 // Otherwise, if can expand, do so. | |
800 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 801 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 802 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
803 | |
804 verify_region_sets_optional(); | |
342 | 805 |
806 size_t num_regions = | |
1973 | 807 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 808 size_t x_size = expansion_regions(); |
3766 | 809 size_t fs = _hrs.free_suffix(); |
810 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
811 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 812 // The only thing we can do now is attempt expansion. |
342 | 813 if (fs + x_size >= num_regions) { |
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814 // If the number of regions we're trying to allocate for this |
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815 // object is at most the number of regions in the free suffix, |
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816 // then the call to humongous_obj_allocate_find_first() above |
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817 // should have succeeded and we wouldn't be here. |
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818 // |
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819 // We should only be trying to expand when the free suffix is |
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820 // not sufficient for the object _and_ we have some expansion |
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821 // room available. |
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822 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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823 |
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824 ergo_verbose1(ErgoHeapSizing, |
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825 "attempt heap expansion", |
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826 ergo_format_reason("humongous allocation request failed") |
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827 ergo_format_byte("allocation request"), |
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828 word_size * HeapWordSize); |
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829 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 830 // Even though the heap was expanded, it might not have |
831 // reached the desired size. So, we cannot assume that the | |
832 // allocation will succeed. | |
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833 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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|
834 } |
2152 | 835 } |
836 } | |
837 | |
2361 | 838 HeapWord* result = NULL; |
3766 | 839 if (first != G1_NULL_HRS_INDEX) { |
2361 | 840 result = |
841 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
842 assert(result != NULL, "it should always return a valid result"); | |
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843 |
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844 // A successful humongous object allocation changes the used space |
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845 // information of the old generation so we need to recalculate the |
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846 // sizes and update the jstat counters here. |
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847 g1mm()->update_sizes(); |
2152 | 848 } |
849 | |
850 verify_region_sets_optional(); | |
2361 | 851 |
852 return result; | |
342 | 853 } |
854 | |
1973 | 855 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
856 assert_heap_not_locked_and_not_at_safepoint(); | |
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857 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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|
858 |
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859 unsigned int dummy_gc_count_before; |
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|
860 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 861 } |
862 | |
863 HeapWord* | |
864 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 865 bool* gc_overhead_limit_was_exceeded) { |
866 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 867 |
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868 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 869 for (int try_count = 1; /* we'll return */; try_count += 1) { |
870 unsigned int gc_count_before; | |
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871 |
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872 HeapWord* result = NULL; |
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873 if (!isHumongous(word_size)) { |
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874 result = attempt_allocation(word_size, &gc_count_before); |
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|
875 } else { |
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876 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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877 } |
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|
878 if (result != NULL) { |
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879 return result; |
342 | 880 } |
881 | |
882 // Create the garbage collection operation... | |
1973 | 883 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 884 // ...and get the VM thread to execute it. |
885 VMThread::execute(&op); | |
1973 | 886 |
887 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
888 // If the operation was successful we'll return the result even | |
889 // if it is NULL. If the allocation attempt failed immediately | |
890 // after a Full GC, it's unlikely we'll be able to allocate now. | |
891 HeapWord* result = op.result(); | |
892 if (result != NULL && !isHumongous(word_size)) { | |
893 // Allocations that take place on VM operations do not do any | |
894 // card dirtying and we have to do it here. We only have to do | |
895 // this for non-humongous allocations, though. | |
896 dirty_young_block(result, word_size); | |
897 } | |
342 | 898 return result; |
1973 | 899 } else { |
900 assert(op.result() == NULL, | |
901 "the result should be NULL if the VM op did not succeed"); | |
342 | 902 } |
903 | |
904 // Give a warning if we seem to be looping forever. | |
905 if ((QueuedAllocationWarningCount > 0) && | |
906 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 907 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 908 } |
909 } | |
1973 | 910 |
911 ShouldNotReachHere(); | |
2433
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912 return NULL; |
342 | 913 } |
914 | |
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915 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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916 unsigned int *gc_count_before_ret) { |
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917 // Make sure you read the note in attempt_allocation_humongous(). |
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|
918 |
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|
919 assert_heap_not_locked_and_not_at_safepoint(); |
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920 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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|
921 "be called for humongous allocation requests"); |
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|
922 |
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|
923 // We should only get here after the first-level allocation attempt |
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|
924 // (attempt_allocation()) failed to allocate. |
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|
925 |
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|
926 // We will loop until a) we manage to successfully perform the |
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|
927 // allocation or b) we successfully schedule a collection which |
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|
928 // fails to perform the allocation. b) is the only case when we'll |
abdfc822206f
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|
929 // return NULL. |
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|
930 HeapWord* result = NULL; |
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|
931 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
932 bool should_try_gc; |
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|
933 unsigned int gc_count_before; |
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|
934 |
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|
935 { |
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|
936 MutexLockerEx x(Heap_lock); |
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|
937 |
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|
938 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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|
939 false /* bot_updates */); |
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|
940 if (result != NULL) { |
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|
941 return result; |
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|
942 } |
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|
943 |
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|
944 // If we reach here, attempt_allocation_locked() above failed to |
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|
945 // allocate a new region. So the mutator alloc region should be NULL. |
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|
946 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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|
947 |
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|
948 if (GC_locker::is_active_and_needs_gc()) { |
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|
949 if (g1_policy()->can_expand_young_list()) { |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
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|
950 // No need for an ergo verbose message here, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3886
diff
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|
951 // can_expand_young_list() does this when it returns true. |
2433
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|
952 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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|
953 false /* bot_updates */); |
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|
954 if (result != NULL) { |
abdfc822206f
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|
955 return result; |
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|
956 } |
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|
957 } |
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|
958 should_try_gc = false; |
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|
959 } else { |
abdfc822206f
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|
960 // Read the GC count while still holding the Heap_lock. |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
961 gc_count_before = total_collections(); |
2433
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|
962 should_try_gc = true; |
abdfc822206f
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|
963 } |
abdfc822206f
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|
964 } |
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|
965 |
abdfc822206f
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diff
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|
966 if (should_try_gc) { |
abdfc822206f
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|
967 bool succeeded; |
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|
968 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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|
969 if (result != NULL) { |
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|
970 assert(succeeded, "only way to get back a non-NULL result"); |
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|
971 return result; |
abdfc822206f
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|
972 } |
abdfc822206f
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|
973 |
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diff
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|
974 if (succeeded) { |
abdfc822206f
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|
975 // If we get here we successfully scheduled a collection which |
abdfc822206f
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|
976 // failed to allocate. No point in trying to allocate |
abdfc822206f
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diff
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|
977 // further. We'll just return NULL. |
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|
978 MutexLockerEx x(Heap_lock); |
4910
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7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
979 *gc_count_before_ret = total_collections(); |
2433
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|
980 return NULL; |
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diff
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|
981 } |
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diff
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|
982 } else { |
abdfc822206f
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|
983 GC_locker::stall_until_clear(); |
abdfc822206f
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|
984 } |
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|
985 |
abdfc822206f
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|
986 // We can reach here if we were unsuccessul in scheduling a |
abdfc822206f
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diff
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|
987 // collection (because another thread beat us to it) or if we were |
abdfc822206f
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diff
changeset
|
988 // stalled due to the GC locker. In either can we should retry the |
abdfc822206f
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diff
changeset
|
989 // allocation attempt in case another thread successfully |
abdfc822206f
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diff
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|
990 // performed a collection and reclaimed enough space. We do the |
abdfc822206f
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diff
changeset
|
991 // first attempt (without holding the Heap_lock) here and the |
abdfc822206f
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diff
changeset
|
992 // follow-on attempt will be at the start of the next loop |
abdfc822206f
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diff
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|
993 // iteration (after taking the Heap_lock). |
abdfc822206f
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|
994 result = _mutator_alloc_region.attempt_allocation(word_size, |
abdfc822206f
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|
995 false /* bot_updates */); |
abdfc822206f
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|
996 if (result != NULL ){ |
abdfc822206f
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|
997 return result; |
abdfc822206f
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|
998 } |
abdfc822206f
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diff
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|
999 |
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diff
changeset
|
1000 // Give a warning if we seem to be looping forever. |
abdfc822206f
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|
1001 if ((QueuedAllocationWarningCount > 0) && |
abdfc822206f
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|
1002 (try_count % QueuedAllocationWarningCount == 0)) { |
abdfc822206f
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diff
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|
1003 warning("G1CollectedHeap::attempt_allocation_slow() " |
abdfc822206f
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diff
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|
1004 "retries %d times", try_count); |
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|
1005 } |
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|
1006 } |
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diff
changeset
|
1007 |
abdfc822206f
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changeset
|
1008 ShouldNotReachHere(); |
abdfc822206f
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diff
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|
1009 return NULL; |
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diff
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|
1010 } |
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1011 |
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1012 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1013 unsigned int * gc_count_before_ret) { |
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1014 // The structure of this method has a lot of similarities to |
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1015 // attempt_allocation_slow(). The reason these two were not merged |
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1016 // into a single one is that such a method would require several "if |
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1017 // allocation is not humongous do this, otherwise do that" |
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1018 // conditional paths which would obscure its flow. In fact, an early |
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1019 // version of this code did use a unified method which was harder to |
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1020 // follow and, as a result, it had subtle bugs that were hard to |
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1021 // track down. So keeping these two methods separate allows each to |
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1022 // be more readable. It will be good to keep these two in sync as |
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1023 // much as possible. |
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1024 |
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1025 assert_heap_not_locked_and_not_at_safepoint(); |
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1026 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1027 "should only be called for humongous allocations"); |
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1028 |
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1029 // Humongous objects can exhaust the heap quickly, so we should check if we |
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1030 // need to start a marking cycle at each humongous object allocation. We do |
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1031 // the check before we do the actual allocation. The reason for doing it |
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1032 // before the allocation is that we avoid having to keep track of the newly |
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1033 // allocated memory while we do a GC. |
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1034 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
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1035 word_size)) { |
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1036 collect(GCCause::_g1_humongous_allocation); |
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1037 } |
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1038 |
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1039 // We will loop until a) we manage to successfully perform the |
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1040 // allocation or b) we successfully schedule a collection which |
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1041 // fails to perform the allocation. b) is the only case when we'll |
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1042 // return NULL. |
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1043 HeapWord* result = NULL; |
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1044 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1045 bool should_try_gc; |
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1046 unsigned int gc_count_before; |
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1047 |
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1048 { |
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1049 MutexLockerEx x(Heap_lock); |
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1050 |
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1051 // Given that humongous objects are not allocated in young |
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1052 // regions, we'll first try to do the allocation without doing a |
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1053 // collection hoping that there's enough space in the heap. |
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1054 result = humongous_obj_allocate(word_size); |
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1055 if (result != NULL) { |
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1056 return result; |
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1057 } |
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1058 |
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1059 if (GC_locker::is_active_and_needs_gc()) { |
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1060 should_try_gc = false; |
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1061 } else { |
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1062 // Read the GC count while still holding the Heap_lock. |
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1063 gc_count_before = total_collections(); |
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1064 should_try_gc = true; |
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1065 } |
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1066 } |
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1067 |
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1068 if (should_try_gc) { |
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1069 // If we failed to allocate the humongous object, we should try to |
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1070 // do a collection pause (if we're allowed) in case it reclaims |
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1071 // enough space for the allocation to succeed after the pause. |
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1072 |
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1073 bool succeeded; |
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1074 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1075 if (result != NULL) { |
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1076 assert(succeeded, "only way to get back a non-NULL result"); |
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1077 return result; |
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1078 } |
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1079 |
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1080 if (succeeded) { |
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1081 // If we get here we successfully scheduled a collection which |
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1082 // failed to allocate. No point in trying to allocate |
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1083 // further. We'll just return NULL. |
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1084 MutexLockerEx x(Heap_lock); |
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1085 *gc_count_before_ret = total_collections(); |
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1086 return NULL; |
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1087 } |
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1088 } else { |
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1089 GC_locker::stall_until_clear(); |
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1090 } |
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1091 |
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1092 // We can reach here if we were unsuccessul in scheduling a |
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1093 // collection (because another thread beat us to it) or if we were |
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1094 // stalled due to the GC locker. In either can we should retry the |
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1095 // allocation attempt in case another thread successfully |
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1096 // performed a collection and reclaimed enough space. Give a |
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1097 // warning if we seem to be looping forever. |
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1098 |
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1099 if ((QueuedAllocationWarningCount > 0) && |
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1100 (try_count % QueuedAllocationWarningCount == 0)) { |
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1101 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1102 "retries %d times", try_count); |
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1103 } |
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1104 } |
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1105 |
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1106 ShouldNotReachHere(); |
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1107 return NULL; |
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1108 } |
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1109 |
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1110 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1111 bool expect_null_mutator_alloc_region) { |
2152 | 1112 assert_at_safepoint(true /* should_be_vm_thread */); |
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1113 assert(_mutator_alloc_region.get() == NULL || |
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1114 !expect_null_mutator_alloc_region, |
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1115 "the current alloc region was unexpectedly found to be non-NULL"); |
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1116 |
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1117 if (!isHumongous(word_size)) { |
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1118 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1119 false /* bot_updates */); |
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1120 } else { |
4829
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1121 HeapWord* result = humongous_obj_allocate(word_size); |
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1122 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
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1123 g1_policy()->set_initiate_conc_mark_if_possible(); |
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1124 } |
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1125 return result; |
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1126 } |
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1127 |
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1128 ShouldNotReachHere(); |
342 | 1129 } |
1130 | |
1131 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1132 ModRefBarrierSet* _mr_bs; | |
1133 public: | |
1134 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1135 bool doHeapRegion(HeapRegion* r) { | |
1136 r->reset_gc_time_stamp(); | |
1137 if (r->continuesHumongous()) | |
1138 return false; | |
1139 HeapRegionRemSet* hrrs = r->rem_set(); | |
1140 if (hrrs != NULL) hrrs->clear(); | |
1141 // You might think here that we could clear just the cards | |
1142 // corresponding to the used region. But no: if we leave a dirty card | |
1143 // in a region we might allocate into, then it would prevent that card | |
1144 // from being enqueued, and cause it to be missed. | |
1145 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1146 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1147 return false; | |
1148 } | |
1149 }; | |
1150 | |
1151 | |
1152 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1153 ModRefBarrierSet* _mr_bs; | |
1154 public: | |
1155 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1156 bool doHeapRegion(HeapRegion* r) { | |
1157 if (r->continuesHumongous()) return false; | |
1158 if (r->used_region().word_size() != 0) { | |
1159 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1160 } | |
1161 return false; | |
1162 } | |
1163 }; | |
1164 | |
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1165 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1166 G1CollectedHeap* _g1h; |
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1167 UpdateRSOopClosure _cl; |
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1168 int _worker_i; |
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1169 public: |
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1170 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1171 _cl(g1->g1_rem_set(), worker_i), |
626
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1172 _worker_i(worker_i), |
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1173 _g1h(g1) |
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1174 { } |
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1175 |
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1176 bool doHeapRegion(HeapRegion* r) { |
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1177 if (!r->continuesHumongous()) { |
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1178 _cl.set_from(r); |
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1179 r->oop_iterate(&_cl); |
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1180 } |
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1181 return false; |
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1182 } |
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1183 }; |
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1184 |
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1185 class ParRebuildRSTask: public AbstractGangTask { |
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1186 G1CollectedHeap* _g1; |
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1187 public: |
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1188 ParRebuildRSTask(G1CollectedHeap* g1) |
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1189 : AbstractGangTask("ParRebuildRSTask"), |
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1190 _g1(g1) |
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1191 { } |
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1192 |
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1193 void work(uint worker_id) { |
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1194 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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1195 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
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1196 _g1->workers()->active_workers(), |
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1197 HeapRegion::RebuildRSClaimValue); |
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1198 } |
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1199 }; |
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1200 |
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1201 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1202 private: |
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1203 G1HRPrinter* _hr_printer; |
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1204 public: |
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1205 bool doHeapRegion(HeapRegion* hr) { |
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1206 assert(!hr->is_young(), "not expecting to find young regions"); |
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1207 // We only generate output for non-empty regions. |
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1208 if (!hr->is_empty()) { |
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1209 if (!hr->isHumongous()) { |
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1210 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1211 } else if (hr->startsHumongous()) { |
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1212 if (hr->capacity() == HeapRegion::GrainBytes) { |
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1213 // single humongous region |
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1214 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1215 } else { |
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1216 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1217 } |
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1218 } else { |
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1219 assert(hr->continuesHumongous(), "only way to get here"); |
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1220 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1221 } |
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1222 } |
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1223 return false; |
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1224 } |
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1225 |
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1226 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1227 : _hr_printer(hr_printer) { } |
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1228 }; |
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1229 |
1973 | 1230 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1231 bool clear_all_soft_refs, |
342 | 1232 size_t word_size) { |
2152 | 1233 assert_at_safepoint(true /* should_be_vm_thread */); |
1234 | |
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1235 if (GC_locker::check_active_before_gc()) { |
1973 | 1236 return false; |
1359
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1237 } |
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1238 |
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1239 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1240 ResourceMark rm; |
1241 | |
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1242 print_heap_before_gc(); |
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1243 |
4072 | 1244 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1245 verify_region_sets_optional(); |
342 | 1246 |
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1247 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1248 collector_policy()->should_clear_all_soft_refs(); |
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1249 |
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1250 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1251 |
342 | 1252 { |
1253 IsGCActiveMark x; | |
1254 | |
1255 // Timing | |
1656
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1256 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1257 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1258 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1259 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
1656
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1260 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1261 PrintGC, true, gclog_or_tty); |
342 | 1262 |
3289
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1263 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
3356
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1264 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1265 |
342 | 1266 double start = os::elapsedTime(); |
1267 g1_policy()->record_full_collection_start(); | |
1268 | |
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1269 // Note: When we have a more flexible GC logging framework that |
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1270 // allows us to add optional attributes to a GC log record we |
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1271 // could consider timing and reporting how long we wait in the |
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1272 // following two methods. |
2152 | 1273 wait_while_free_regions_coming(); |
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1274 // If we start the compaction before the CM threads finish |
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1275 // scanning the root regions we might trip them over as we'll |
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1276 // be moving objects / updating references. So let's wait until |
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1277 // they are done. By telling them to abort, they should complete |
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1278 // early. |
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1279 _cm->root_regions()->abort(); |
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1280 _cm->root_regions()->wait_until_scan_finished(); |
2361 | 1281 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1282 |
342 | 1283 gc_prologue(true); |
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1284 increment_total_collections(true /* full gc */); |
342 | 1285 |
1286 size_t g1h_prev_used = used(); | |
1287 assert(used() == recalculate_used(), "Should be equal"); | |
1288 | |
1289 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1290 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1291 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1292 prepare_for_verify(); |
3772
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1293 Universe::verify(/* allow dirty */ true, |
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1294 /* silent */ false, |
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1295 /* option */ VerifyOption_G1UsePrevMarking); |
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1296 |
342 | 1297 } |
3869
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1298 pre_full_gc_dump(); |
342 | 1299 |
1300 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1301 | |
3979
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1302 // Disable discovery and empty the discovered lists |
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1303 // for the CM ref processor. |
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1304 ref_processor_cm()->disable_discovery(); |
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1305 ref_processor_cm()->abandon_partial_discovery(); |
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1306 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1307 |
1308 // Abandon current iterations of concurrent marking and concurrent | |
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1309 // refinement, if any are in progress. We have to do this before |
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1310 // wait_until_scan_finished() below. |
342 | 1311 concurrent_mark()->abort(); |
1312 | |
1313 // Make sure we'll choose a new allocation region afterwards. | |
2433
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1314 release_mutator_alloc_region(); |
636 | 1315 abandon_gc_alloc_regions(); |
1861 | 1316 g1_rem_set()->cleanupHRRS(); |
1394
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1317 |
3778
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1318 // We should call this after we retire any currently active alloc |
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1319 // regions so that all the ALLOC / RETIRE events are generated |
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1320 // before the start GC event. |
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1321 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1322 |
1394
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1323 // We may have added regions to the current incremental collection |
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1324 // set between the last GC or pause and now. We need to clear the |
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1325 // incremental collection set and then start rebuilding it afresh |
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1326 // after this full GC. |
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1327 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1328 g1_policy()->clear_incremental_cset(); |
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1329 g1_policy()->stop_incremental_cset_building(); |
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1330 |
4072 | 1331 tear_down_region_sets(false /* free_list_only */); |
4710 | 1332 g1_policy()->set_gcs_are_young(true); |
342 | 1333 |
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1334 // See the comments in g1CollectedHeap.hpp and |
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1335 // G1CollectedHeap::ref_processing_init() about |
1974
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1336 // how reference processing currently works in G1. |
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1337 |
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1338 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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1339 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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1340 |
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1341 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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1342 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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1343 |
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1344 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1345 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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1346 |
342 | 1347 // Do collection work |
1348 { | |
1349 HandleMark hm; // Discard invalid handles created during gc | |
3979
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1350 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1351 } |
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1352 |
2152 | 1353 assert(free_regions() == 0, "we should not have added any free regions"); |
4072 | 1354 rebuild_region_sets(false /* free_list_only */); |
342 | 1355 |
3979
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1356 // Enqueue any discovered reference objects that have |
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1357 // not been removed from the discovered lists. |
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1358 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1359 |
1360 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1361 | |
1089
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1362 MemoryService::track_memory_usage(); |
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1363 |
342 | 1364 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1365 HandleMark hm; // Discard invalid handles created during verification | |
1366 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
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|
1367 prepare_for_verify(); |
3772
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|
1368 Universe::verify(/* allow dirty */ false, |
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1369 /* silent */ false, |
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1370 /* option */ VerifyOption_G1UsePrevMarking); |
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1371 |
342 | 1372 } |
3979
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1373 |
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1374 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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1375 ref_processor_stw()->verify_no_references_recorded(); |
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1376 |
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1377 // Note: since we've just done a full GC, concurrent |
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1378 // marking is no longer active. Therefore we need not |
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|
1379 // re-enable reference discovery for the CM ref processor. |
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1380 // That will be done at the start of the next marking cycle. |
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1381 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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1382 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1383 |
1384 reset_gc_time_stamp(); | |
1385 // Since everything potentially moved, we will clear all remembered | |
626
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1386 // sets, and clear all cards. Later we will rebuild remebered |
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1387 // sets. We will also reset the GC time stamps of the regions. |
342 | 1388 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1389 heap_region_iterate(&rs_clear); | |
1390 | |
1391 // Resize the heap if necessary. | |
1656
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1392 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1393 |
3778
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1394 if (_hr_printer.is_active()) { |
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1395 // We should do this after we potentially resize the heap so |
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1396 // that all the COMMIT / UNCOMMIT events are generated before |
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1397 // the end GC event. |
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|
1398 |
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1399 PostCompactionPrinterClosure cl(hr_printer()); |
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1400 heap_region_iterate(&cl); |
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1401 |
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1402 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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1403 } |
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1404 |
342 | 1405 if (_cg1r->use_cache()) { |
1406 _cg1r->clear_and_record_card_counts(); | |
1407 _cg1r->clear_hot_cache(); | |
1408 } | |
1409 | |
626
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1410 // Rebuild remembered sets of all regions. |
1833
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|
1411 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4728
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|
1412 uint n_workers = |
4095
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1413 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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1414 workers()->active_workers(), |
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1415 Threads::number_of_non_daemon_threads()); |
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1416 assert(UseDynamicNumberOfGCThreads || |
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1417 n_workers == workers()->total_workers(), |
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1418 "If not dynamic should be using all the workers"); |
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1419 workers()->set_active_workers(n_workers); |
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1420 // Set parallel threads in the heap (_n_par_threads) only |
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1421 // before a parallel phase and always reset it to 0 after |
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1422 // the phase so that the number of parallel threads does |
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1423 // no get carried forward to a serial phase where there |
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1424 // may be code that is "possibly_parallel". |
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1425 set_par_threads(n_workers); |
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1426 |
626
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1427 ParRebuildRSTask rebuild_rs_task(this); |
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1428 assert(check_heap_region_claim_values( |
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1429 HeapRegion::InitialClaimValue), "sanity check"); |
4095
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1430 assert(UseDynamicNumberOfGCThreads || |
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1431 workers()->active_workers() == workers()->total_workers(), |
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1432 "Unless dynamic should use total workers"); |
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1433 // Use the most recent number of active workers |
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1434 assert(workers()->active_workers() > 0, |
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1435 "Active workers not properly set"); |
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|
1436 set_par_threads(workers()->active_workers()); |
626
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1437 workers()->run_task(&rebuild_rs_task); |
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1438 set_par_threads(0); |
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1439 assert(check_heap_region_claim_values( |
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1440 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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|
1441 reset_heap_region_claim_values(); |
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|
1442 } else { |
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|
1443 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1444 heap_region_iterate(&rebuild_rs); |
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|
1445 } |
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1446 |
342 | 1447 if (PrintGC) { |
1448 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1449 } | |
1450 | |
1451 if (true) { // FIXME | |
1452 // Ask the permanent generation to adjust size for full collections | |
1453 perm()->compute_new_size(); | |
1454 } | |
1455 | |
1394
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1456 // Start a new incremental collection set for the next pause |
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1457 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1458 g1_policy()->start_incremental_cset_building(); |
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1459 |
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1460 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1461 // regions to the incremental collection set for the next |
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1462 // evacuation pause. |
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|
1463 clear_cset_fast_test(); |
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1464 |
2433
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|
1465 init_mutator_alloc_region(); |
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1466 |
342 | 1467 double end = os::elapsedTime(); |
1468 g1_policy()->record_full_collection_end(); | |
1469 | |
546
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1470 #ifdef TRACESPINNING |
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1471 ParallelTaskTerminator::print_termination_counts(); |
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1472 #endif |
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1473 |
342 | 1474 gc_epilogue(true); |
1475 | |
794 | 1476 // Discard all rset updates |
1477 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1478 assert(!G1DeferredRSUpdate |
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1479 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1480 } |
1481 | |
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1482 _young_list->reset_sampled_info(); |
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1483 // At this point there should be no regions in the |
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1484 // entire heap tagged as young. |
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1485 assert( check_young_list_empty(true /* check_heap */), |
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1486 "young list should be empty at this point"); |
838
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1487 |
1656
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1488 // Update the number of full collections that have been completed. |
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1489 increment_full_collections_completed(false /* concurrent */); |
1656
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1490 |
3766 | 1491 _hrs.verify_optional(); |
2152 | 1492 verify_region_sets_optional(); |
1493 | |
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1494 print_heap_after_gc(); |
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1495 g1mm()->update_sizes(); |
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1496 post_full_gc_dump(); |
1973 | 1497 |
1498 return true; | |
342 | 1499 } |
1500 | |
1501 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1502 // do_collection() will return whether it succeeded in performing |
1503 // the GC. Currently, there is no facility on the | |
1504 // do_full_collection() API to notify the caller than the collection | |
1505 // did not succeed (e.g., because it was locked out by the GC | |
1506 // locker). So, right now, we'll ignore the return value. | |
1507 bool dummy = do_collection(true, /* explicit_gc */ | |
1508 clear_all_soft_refs, | |
1509 0 /* word_size */); | |
342 | 1510 } |
1511 | |
1512 // This code is mostly copied from TenuredGeneration. | |
1513 void | |
1514 G1CollectedHeap:: | |
1515 resize_if_necessary_after_full_collection(size_t word_size) { | |
1516 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1517 | |
1518 // Include the current allocation, if any, and bytes that will be | |
1519 // pre-allocated to support collections, as "used". | |
1520 const size_t used_after_gc = used(); | |
1521 const size_t capacity_after_gc = capacity(); | |
1522 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1523 | |
1717
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1524 // This is enforced in arguments.cpp. |
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1525 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1526 "otherwise the code below doesn't make sense"); |
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1527 |
342 | 1528 // We don't have floating point command-line arguments |
1717
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1529 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1530 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1531 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1532 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1533 | |
1717
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1534 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1535 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1536 |
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1537 // We have to be careful here as these two calculations can overflow |
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1538 // 32-bit size_t's. |
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1539 double used_after_gc_d = (double) used_after_gc; |
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1540 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1541 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1542 |
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1543 // Let's make sure that they are both under the max heap size, which |
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1544 // by default will make them fit into a size_t. |
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1545 double desired_capacity_upper_bound = (double) max_heap_size; |
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1546 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1547 desired_capacity_upper_bound); |
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1548 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1549 desired_capacity_upper_bound); |
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1550 |
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1551 // We can now safely turn them into size_t's. |
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1552 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1553 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1554 |
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1555 // This assert only makes sense here, before we adjust them |
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1556 // with respect to the min and max heap size. |
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1557 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1558 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1559 "maximum_desired_capacity = "SIZE_FORMAT, |
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1560 minimum_desired_capacity, maximum_desired_capacity)); |
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1561 |
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1562 // Should not be greater than the heap max size. No need to adjust |
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1563 // it with respect to the heap min size as it's a lower bound (i.e., |
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1564 // we'll try to make the capacity larger than it, not smaller). |
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1565 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1566 // Should not be less than the heap min size. No need to adjust it |
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1567 // with respect to the heap max size as it's an upper bound (i.e., |
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1568 // we'll try to make the capacity smaller than it, not greater). |
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1569 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1570 |
1717
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1571 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1572 // Don't expand unless it's significant |
1573 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1574 ergo_verbose4(ErgoHeapSizing, |
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1575 "attempt heap expansion", |
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1576 ergo_format_reason("capacity lower than " |
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1577 "min desired capacity after Full GC") |
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1578 ergo_format_byte("capacity") |
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1579 ergo_format_byte("occupancy") |
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1580 ergo_format_byte_perc("min desired capacity"), |
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1581 capacity_after_gc, used_after_gc, |
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1582 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1583 expand(expand_bytes); |
342 | 1584 |
1585 // No expansion, now see if we want to shrink | |
1717
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1586 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1587 // Capacity too large, compute shrinking size |
1588 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
3914
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1589 ergo_verbose4(ErgoHeapSizing, |
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1590 "attempt heap shrinking", |
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1591 ergo_format_reason("capacity higher than " |
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1592 "max desired capacity after Full GC") |
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1593 ergo_format_byte("capacity") |
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1594 ergo_format_byte("occupancy") |
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1595 ergo_format_byte_perc("max desired capacity"), |
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1596 capacity_after_gc, used_after_gc, |
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1597 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1598 shrink(shrink_bytes); |
1599 } | |
1600 } | |
1601 | |
1602 | |
1603 HeapWord* | |
1973 | 1604 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1605 bool* succeeded) { | |
2152 | 1606 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1607 |
1608 *succeeded = true; | |
1609 // Let's attempt the allocation first. | |
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1610 HeapWord* result = |
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1611 attempt_allocation_at_safepoint(word_size, |
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1612 false /* expect_null_mutator_alloc_region */); |
1973 | 1613 if (result != NULL) { |
1614 assert(*succeeded, "sanity"); | |
1615 return result; | |
1616 } | |
342 | 1617 |
1618 // In a G1 heap, we're supposed to keep allocation from failing by | |
1619 // incremental pauses. Therefore, at least for now, we'll favor | |
1620 // expansion over collection. (This might change in the future if we can | |
1621 // do something smarter than full collection to satisfy a failed alloc.) | |
1622 result = expand_and_allocate(word_size); | |
1623 if (result != NULL) { | |
1973 | 1624 assert(*succeeded, "sanity"); |
342 | 1625 return result; |
1626 } | |
1627 | |
1973 | 1628 // Expansion didn't work, we'll try to do a Full GC. |
1629 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1630 false, /* clear_all_soft_refs */ | |
1631 word_size); | |
1632 if (!gc_succeeded) { | |
1633 *succeeded = false; | |
1634 return NULL; | |
1635 } | |
1636 | |
1637 // Retry the allocation | |
1638 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1639 true /* expect_null_mutator_alloc_region */); |
342 | 1640 if (result != NULL) { |
1973 | 1641 assert(*succeeded, "sanity"); |
342 | 1642 return result; |
1643 } | |
1644 | |
1973 | 1645 // Then, try a Full GC that will collect all soft references. |
1646 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1647 true, /* clear_all_soft_refs */ | |
1648 word_size); | |
1649 if (!gc_succeeded) { | |
1650 *succeeded = false; | |
1651 return NULL; | |
1652 } | |
1653 | |
1654 // Retry the allocation once more | |
1655 result = attempt_allocation_at_safepoint(word_size, | |
2433
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1656 true /* expect_null_mutator_alloc_region */); |
342 | 1657 if (result != NULL) { |
1973 | 1658 assert(*succeeded, "sanity"); |
342 | 1659 return result; |
1660 } | |
1661 | |
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1662 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1663 "Flag should have been handled and cleared prior to this point"); |
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1664 |
342 | 1665 // What else? We might try synchronous finalization later. If the total |
1666 // space available is large enough for the allocation, then a more | |
1667 // complete compaction phase than we've tried so far might be | |
1668 // appropriate. | |
1973 | 1669 assert(*succeeded, "sanity"); |
342 | 1670 return NULL; |
1671 } | |
1672 | |
1673 // Attempting to expand the heap sufficiently | |
1674 // to support an allocation of the given "word_size". If | |
1675 // successful, perform the allocation and return the address of the | |
1676 // allocated block, or else "NULL". | |
1677 | |
1678 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1679 assert_at_safepoint(true /* should_be_vm_thread */); |
1680 | |
1681 verify_region_sets_optional(); | |
1973 | 1682 |
2188
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1683 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1684 ergo_verbose1(ErgoHeapSizing, |
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1685 "attempt heap expansion", |
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1686 ergo_format_reason("allocation request failed") |
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1687 ergo_format_byte("allocation request"), |
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1688 word_size * HeapWordSize); |
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1689 if (expand(expand_bytes)) { |
3766 | 1690 _hrs.verify_optional(); |
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1691 verify_region_sets_optional(); |
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1692 return attempt_allocation_at_safepoint(word_size, |
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1693 false /* expect_null_mutator_alloc_region */); |
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1694 } |
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1695 return NULL; |
342 | 1696 } |
1697 | |
3766 | 1698 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1699 HeapWord* new_end) { | |
1700 assert(old_end != new_end, "don't call this otherwise"); | |
1701 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1702 | |
1703 // Update the committed mem region. | |
1704 _g1_committed.set_end(new_end); | |
1705 // Tell the card table about the update. | |
1706 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1707 // Tell the BOT about the update. | |
1708 _bot_shared->resize(_g1_committed.word_size()); | |
1709 } | |
1710 | |
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1711 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1712 size_t old_mem_size = _g1_storage.committed_size(); |
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1713 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1714 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1715 HeapRegion::GrainBytes); | |
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1716 ergo_verbose2(ErgoHeapSizing, |
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1717 "expand the heap", |
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1718 ergo_format_byte("requested expansion amount") |
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1719 ergo_format_byte("attempted expansion amount"), |
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1720 expand_bytes, aligned_expand_bytes); |
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1721 |
3766 | 1722 // First commit the memory. |
1723 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1724 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1725 if (successful) { |
3766 | 1726 // Then propagate this update to the necessary data structures. |
1727 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1728 update_committed_space(old_end, new_end); | |
1729 | |
1730 FreeRegionList expansion_list("Local Expansion List"); | |
1731 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1732 assert(mr.start() == old_end, "post-condition"); | |
1733 // mr might be a smaller region than what was requested if | |
1734 // expand_by() was unable to allocate the HeapRegion instances | |
1735 assert(mr.end() <= new_end, "post-condition"); | |
1736 | |
1737 size_t actual_expand_bytes = mr.byte_size(); | |
1738 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1739 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1740 "post-condition"); | |
1741 if (actual_expand_bytes < aligned_expand_bytes) { | |
1742 // We could not expand _hrs to the desired size. In this case we | |
1743 // need to shrink the committed space accordingly. | |
1744 assert(mr.end() < new_end, "invariant"); | |
1745 | |
1746 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1747 // First uncommit the memory. | |
1748 _g1_storage.shrink_by(diff_bytes); | |
1749 // Then propagate this update to the necessary data structures. | |
1750 update_committed_space(new_end, mr.end()); | |
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1751 } |
3766 | 1752 _free_list.add_as_tail(&expansion_list); |
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1753 |
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1754 if (_hr_printer.is_active()) { |
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1755 HeapWord* curr = mr.start(); |
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1756 while (curr < mr.end()) { |
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1757 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1758 _hr_printer.commit(curr, curr_end); |
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1759 curr = curr_end; |
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1760 } |
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1761 assert(curr == mr.end(), "post-condition"); |
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1762 } |
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1763 g1_policy()->record_new_heap_size(n_regions()); |
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1764 } else { |
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1765 ergo_verbose0(ErgoHeapSizing, |
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1766 "did not expand the heap", |
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1767 ergo_format_reason("heap expansion operation failed")); |
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1768 // The expansion of the virtual storage space was unsuccessful. |
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1769 // Let's see if it was because we ran out of swap. |
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1770 if (G1ExitOnExpansionFailure && |
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1771 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1772 // We had head room... |
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1773 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1774 } |
1775 } | |
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1776 return successful; |
342 | 1777 } |
1778 | |
3766 | 1779 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1780 size_t old_mem_size = _g1_storage.committed_size(); |
1781 size_t aligned_shrink_bytes = | |
1782 ReservedSpace::page_align_size_down(shrink_bytes); | |
1783 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1784 HeapRegion::GrainBytes); | |
1785 size_t num_regions_deleted = 0; | |
3766 | 1786 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1787 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1788 assert(mr.end() == old_end, "post-condition"); | |
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1789 |
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1790 ergo_verbose3(ErgoHeapSizing, |
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1791 "shrink the heap", |
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1792 ergo_format_byte("requested shrinking amount") |
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1793 ergo_format_byte("aligned shrinking amount") |
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1794 ergo_format_byte("attempted shrinking amount"), |
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1795 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1796 if (mr.byte_size() > 0) { |
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1797 if (_hr_printer.is_active()) { |
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1798 HeapWord* curr = mr.end(); |
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1799 while (curr > mr.start()) { |
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1800 HeapWord* curr_end = curr; |
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1801 curr -= HeapRegion::GrainWords; |
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1802 _hr_printer.uncommit(curr, curr_end); |
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1803 } |
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1804 assert(curr == mr.start(), "post-condition"); |
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1805 } |
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1806 |
342 | 1807 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1808 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1809 assert(mr.start() == new_end, "post-condition"); | |
1810 | |
1811 _expansion_regions += num_regions_deleted; | |
1812 update_committed_space(old_end, new_end); | |
1813 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1814 g1_policy()->record_new_heap_size(n_regions()); |
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1815 } else { |
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1816 ergo_verbose0(ErgoHeapSizing, |
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1817 "did not shrink the heap", |
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1818 ergo_format_reason("heap shrinking operation failed")); |
342 | 1819 } |
1820 } | |
1821 | |
1822 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1823 verify_region_sets_optional(); |
1824 | |
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1825 // We should only reach here at the end of a Full GC which means we |
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1826 // should not not be holding to any GC alloc regions. The method |
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1827 // below will make sure of that and do any remaining clean up. |
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1828 abandon_gc_alloc_regions(); |
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1829 |
2152 | 1830 // Instead of tearing down / rebuilding the free lists here, we |
1831 // could instead use the remove_all_pending() method on free_list to | |
1832 // remove only the ones that we need to remove. | |
4072 | 1833 tear_down_region_sets(true /* free_list_only */); |
342 | 1834 shrink_helper(shrink_bytes); |
4072 | 1835 rebuild_region_sets(true /* free_list_only */); |
2152 | 1836 |
3766 | 1837 _hrs.verify_optional(); |
2152 | 1838 verify_region_sets_optional(); |
342 | 1839 } |
1840 | |
1841 // Public methods. | |
1842 | |
1843 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1844 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1845 #endif // _MSC_VER | |
1846 | |
1847 | |
1848 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1849 SharedHeap(policy_), | |
1850 _g1_policy(policy_), | |
1111 | 1851 _dirty_card_queue_set(false), |
1705 | 1852 _into_cset_dirty_card_queue_set(false), |
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1853 _is_alive_closure_cm(this), |
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1854 _is_alive_closure_stw(this), |
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1855 _ref_processor_cm(NULL), |
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1856 _ref_processor_stw(NULL), |
342 | 1857 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1858 _bot_shared(NULL), | |
1859 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1860 _evac_failure_scan_stack(NULL) , | |
1861 _mark_in_progress(false), | |
2152 | 1862 _cg1r(NULL), _summary_bytes_used(0), |
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1863 _g1mm(NULL), |
342 | 1864 _refine_cte_cl(NULL), |
1865 _full_collection(false), | |
2152 | 1866 _free_list("Master Free List"), |
1867 _secondary_free_list("Secondary Free List"), | |
4072 | 1868 _old_set("Old Set"), |
2152 | 1869 _humongous_set("Master Humongous Set"), |
1870 _free_regions_coming(false), | |
342 | 1871 _young_list(new YoungList(this)), |
1872 _gc_time_stamp(0), | |
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1873 _retained_old_gc_alloc_region(NULL), |
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1874 _expand_heap_after_alloc_failure(true), |
526 | 1875 _surviving_young_words(NULL), |
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1876 _full_collections_completed(0), |
526 | 1877 _in_cset_fast_test(NULL), |
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1878 _in_cset_fast_test_base(NULL), |
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1879 _dirty_cards_region_list(NULL), |
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1880 _worker_cset_start_region(NULL), |
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1881 _worker_cset_start_region_time_stamp(NULL) { |
342 | 1882 _g1h = this; // To catch bugs. |
1883 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1884 vm_exit_during_initialization("Failed necessary allocation."); | |
1885 } | |
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1886 |
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1887 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1888 |
342 | 1889 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1890 _task_queues = new RefToScanQueueSet(n_queues); | |
1891 | |
1892 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1893 assert(n_rem_sets > 0, "Invariant."); | |
1894 | |
1895 HeapRegionRemSetIterator** iter_arr = | |
1896 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1897 for (int i = 0; i < n_queues; i++) { | |
1898 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1899 } | |
1900 _rem_set_iterator = iter_arr; | |
1901 | |
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1902 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1903 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1904 |
342 | 1905 for (int i = 0; i < n_queues; i++) { |
1906 RefToScanQueue* q = new RefToScanQueue(); | |
1907 q->initialize(); | |
1908 _task_queues->register_queue(i, q); | |
1909 } | |
1910 | |
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1911 clear_cset_start_regions(); |
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1912 |
342 | 1913 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1914 } | |
1915 | |
1916 jint G1CollectedHeap::initialize() { | |
1166 | 1917 CollectedHeap::pre_initialize(); |
342 | 1918 os::enable_vtime(); |
1919 | |
1920 // Necessary to satisfy locking discipline assertions. | |
1921 | |
1922 MutexLocker x(Heap_lock); | |
1923 | |
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1924 // We have to initialize the printer before committing the heap, as |
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1925 // it will be used then. |
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1926 _hr_printer.set_active(G1PrintHeapRegions); |
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1927 |
342 | 1928 // While there are no constraints in the GC code that HeapWordSize |
1929 // be any particular value, there are multiple other areas in the | |
1930 // system which believe this to be true (e.g. oop->object_size in some | |
1931 // cases incorrectly returns the size in wordSize units rather than | |
1932 // HeapWordSize). | |
1933 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1934 | |
1935 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1936 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1937 | |
1938 // Ensure that the sizes are properly aligned. | |
1939 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1940 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1941 | |
1942 _cg1r = new ConcurrentG1Refine(); | |
1943 | |
1944 // Reserve the maximum. | |
1945 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1946 // Includes the perm-gen. | |
642
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1947 |
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1948 // When compressed oops are enabled, the preferred heap base |
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1949 // is calculated by subtracting the requested size from the |
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1950 // 32Gb boundary and using the result as the base address for |
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1951 // heap reservation. If the requested size is not aligned to |
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1952 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1953 // into the ReservedHeapSpace constructor) then the actual |
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1954 // base of the reserved heap may end up differing from the |
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1955 // address that was requested (i.e. the preferred heap base). |
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1956 // If this happens then we could end up using a non-optimal |
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1957 // compressed oops mode. |
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1958 |
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1959 // Since max_byte_size is aligned to the size of a heap region (checked |
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1960 // above), we also need to align the perm gen size as it might not be. |
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1961 const size_t total_reserved = max_byte_size + |
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1962 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1963 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1964 |
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1965 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1966 |
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1967 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1968 UseLargePages, addr); |
642
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1969 |
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1970 if (UseCompressedOops) { |
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1971 if (addr != NULL && !heap_rs.is_reserved()) { |
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1972 // Failed to reserve at specified address - the requested memory |
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1973 // region is taken already, for example, by 'java' launcher. |
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1974 // Try again to reserver heap higher. |
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1975 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1976 |
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1977 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1978 UseLargePages, addr); |
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1979 |
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1980 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1981 // Failed to reserve at specified address again - give up. |
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1982 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1983 assert(addr == NULL, ""); |
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1984 |
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1985 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1986 UseLargePages, addr); |
642
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1987 heap_rs = heap_rs1; |
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1988 } else { |
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1989 heap_rs = heap_rs0; |
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1990 } |
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1991 } |
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1992 } |
342 | 1993 |
1994 if (!heap_rs.is_reserved()) { | |
1995 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1996 return JNI_ENOMEM; | |
1997 } | |
1998 | |
1999 // It is important to do this in a way such that concurrent readers can't | |
2000 // temporarily think somethings in the heap. (I've actually seen this | |
2001 // happen in asserts: DLD.) | |
2002 _reserved.set_word_size(0); | |
2003 _reserved.set_start((HeapWord*)heap_rs.base()); | |
2004 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
2005 | |
2006 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
2007 | |
2008 // Create the gen rem set (and barrier set) for the entire reserved region. | |
2009 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
2010 set_barrier_set(rem_set()->bs()); | |
2011 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
2012 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
2013 } else { | |
2014 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
2015 return JNI_ENOMEM; | |
2016 } | |
2017 | |
2018 // Also create a G1 rem set. | |
1861 | 2019 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
2020 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 2021 } else { |
1861 | 2022 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
2023 return JNI_ENOMEM; | |
342 | 2024 } |
2025 | |
2026 // Carve out the G1 part of the heap. | |
2027 | |
2028 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2029 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2030 g1_rs.size()/HeapWordSize); | |
2031 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
2032 | |
2033 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
2034 | |
2035 _g1_storage.initialize(g1_rs, 0); | |
2036 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2037 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
2038 (HeapWord*) _g1_reserved.end(), | |
2039 _expansion_regions); | |
342 | 2040 |
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2041 // 6843694 - ensure that the maximum region index can fit |
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2042 // in the remembered set structures. |
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2043 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2044 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2045 |
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2046 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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2047 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
3986
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2048 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2049 "too many cards per region"); |
807
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2050 |
2152 | 2051 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2052 | |
342 | 2053 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2054 heap_word_size(init_byte_size)); | |
2055 | |
2056 _g1h = this; | |
2057 | |
1394
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2058 _in_cset_fast_test_length = max_regions(); |
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2059 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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2060 |
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2061 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2062 // beginning of the heap every time we want to index; basically |
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2063 // it's the same with what we do with the card table. |
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2064 _in_cset_fast_test = _in_cset_fast_test_base - |
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2065 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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2066 |
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2067 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2068 // regions to the incremental collection set for the first |
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2069 // evacuation pause. |
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2070 clear_cset_fast_test(); |
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2071 |
342 | 2072 // Create the ConcurrentMark data structure and thread. |
2073 // (Must do this late, so that "max_regions" is defined.) | |
2074 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2075 _cmThread = _cm->cmThread(); | |
2076 | |
2077 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2078 HeapRegionRemSet::init_heap(max_regions()); | |
2079 | |
677 | 2080 // Now expand into the initial heap size. |
2188
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2081 if (!expand(init_byte_size)) { |
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2082 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2083 return JNI_ENOMEM; |
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2084 } |
342 | 2085 |
2086 // Perform any initialization actions delegated to the policy. | |
2087 g1_policy()->init(); | |
2088 | |
2089 _refine_cte_cl = | |
2090 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2091 g1_rem_set(), | |
2092 concurrent_g1_refine()); | |
2093 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2094 | |
2095 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2096 SATB_Q_FL_lock, | |
1111 | 2097 G1SATBProcessCompletedThreshold, |
342 | 2098 Shared_SATB_Q_lock); |
794 | 2099 |
2100 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2101 DirtyCardQ_FL_lock, | |
1111 | 2102 concurrent_g1_refine()->yellow_zone(), |
2103 concurrent_g1_refine()->red_zone(), | |
794 | 2104 Shared_DirtyCardQ_lock); |
2105 | |
616
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2106 if (G1DeferredRSUpdate) { |
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|
2107 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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2108 DirtyCardQ_FL_lock, |
1111 | 2109 -1, // never trigger processing |
2110 -1, // no limit on length | |
616
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2111 Shared_DirtyCardQ_lock, |
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2112 &JavaThread::dirty_card_queue_set()); |
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2113 } |
1705 | 2114 |
2115 // Initialize the card queue set used to hold cards containing | |
2116 // references into the collection set. | |
2117 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2118 DirtyCardQ_FL_lock, | |
2119 -1, // never trigger processing | |
2120 -1, // no limit on length | |
2121 Shared_DirtyCardQ_lock, | |
2122 &JavaThread::dirty_card_queue_set()); | |
2123 | |
342 | 2124 // In case we're keeping closure specialization stats, initialize those |
2125 // counts and that mechanism. | |
2126 SpecializationStats::clear(); | |
2127 | |
2128 // Do later initialization work for concurrent refinement. | |
2129 _cg1r->init(); | |
2130 | |
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2131 // Here we allocate the dummy full region that is required by the |
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2132 // G1AllocRegion class. If we don't pass an address in the reserved |
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2133 // space here, lots of asserts fire. |
3766 | 2134 |
2135 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2136 _g1_reserved.start()); | |
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2137 // We'll re-use the same region whether the alloc region will |
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2138 // require BOT updates or not and, if it doesn't, then a non-young |
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2139 // region will complain that it cannot support allocations without |
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2140 // BOT updates. So we'll tag the dummy region as young to avoid that. |
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2141 dummy_region->set_young(); |
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2142 // Make sure it's full. |
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2143 dummy_region->set_top(dummy_region->end()); |
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2144 G1AllocRegion::setup(this, dummy_region); |
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2145 |
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2146 init_mutator_alloc_region(); |
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2147 |
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2148 // Do create of the monitoring and management support so that |
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2149 // values in the heap have been properly initialized. |
3980
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2150 _g1mm = new G1MonitoringSupport(this); |
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2151 |
342 | 2152 return JNI_OK; |
2153 } | |
2154 | |
2155 void G1CollectedHeap::ref_processing_init() { | |
1974
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2156 // Reference processing in G1 currently works as follows: |
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2157 // |
3979
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2158 // * There are two reference processor instances. One is |
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2159 // used to record and process discovered references |
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2160 // during concurrent marking; the other is used to |
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2161 // record and process references during STW pauses |
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2162 // (both full and incremental). |
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2163 // * Both ref processors need to 'span' the entire heap as |
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2164 // the regions in the collection set may be dotted around. |
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2165 // |
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2166 // * For the concurrent marking ref processor: |
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2167 // * Reference discovery is enabled at initial marking. |
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2168 // * Reference discovery is disabled and the discovered |
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2169 // references processed etc during remarking. |
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2170 // * Reference discovery is MT (see below). |
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2171 // * Reference discovery requires a barrier (see below). |
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2172 // * Reference processing may or may not be MT |
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2173 // (depending on the value of ParallelRefProcEnabled |
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|
2174 // and ParallelGCThreads). |
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2175 // * A full GC disables reference discovery by the CM |
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2176 // ref processor and abandons any entries on it's |
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|
2177 // discovered lists. |
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2178 // |
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2179 // * For the STW processor: |
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2180 // * Non MT discovery is enabled at the start of a full GC. |
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2181 // * Processing and enqueueing during a full GC is non-MT. |
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2182 // * During a full GC, references are processed after marking. |
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2183 // |
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2184 // * Discovery (may or may not be MT) is enabled at the start |
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2185 // of an incremental evacuation pause. |
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2186 // * References are processed near the end of a STW evacuation pause. |
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2187 // * For both types of GC: |
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|
2188 // * Discovery is atomic - i.e. not concurrent. |
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|
2189 // * Reference discovery will not need a barrier. |
1974
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|
2190 |
342 | 2191 SharedHeap::ref_processing_init(); |
2192 MemRegion mr = reserved_region(); | |
3979
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|
2193 |
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|
2194 // Concurrent Mark ref processor |
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|
2195 _ref_processor_cm = |
2369
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6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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2361
diff
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|
2196 new ReferenceProcessor(mr, // span |
3979
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|
2197 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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|
2198 // mt processing |
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|
2199 (int) ParallelGCThreads, |
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|
2200 // degree of mt processing |
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|
2201 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
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|
2202 // mt discovery |
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|
2203 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
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|
2204 // degree of mt discovery |
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changeset
|
2205 false, |
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|
2206 // Reference discovery is not atomic |
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changeset
|
2207 &_is_alive_closure_cm, |
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changeset
|
2208 // is alive closure |
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changeset
|
2209 // (for efficiency/performance) |
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|
2210 true); |
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|
2211 // Setting next fields of discovered |
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|
2212 // lists requires a barrier. |
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|
2213 |
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|
2214 // STW ref processor |
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|
2215 _ref_processor_stw = |
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|
2216 new ReferenceProcessor(mr, // span |
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|
2217 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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|
2218 // mt processing |
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|
2219 MAX2((int)ParallelGCThreads, 1), |
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|
2220 // degree of mt processing |
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|
2221 (ParallelGCThreads > 1), |
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|
2222 // mt discovery |
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|
2223 MAX2((int)ParallelGCThreads, 1), |
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|
2224 // degree of mt discovery |
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diff
changeset
|
2225 true, |
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|
2226 // Reference discovery is atomic |
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|
2227 &_is_alive_closure_stw, |
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|
2228 // is alive closure |
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|
2229 // (for efficiency/performance) |
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|
2230 false); |
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|
2231 // Setting next fields of discovered |
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|
2232 // lists requires a barrier. |
342 | 2233 } |
2234 | |
2235 size_t G1CollectedHeap::capacity() const { | |
2236 return _g1_committed.byte_size(); | |
2237 } | |
2238 | |
1705 | 2239 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2240 DirtyCardQueue* into_cset_dcq, | |
2241 bool concurrent, | |
342 | 2242 int worker_i) { |
889 | 2243 // Clean cards in the hot card cache |
1705 | 2244 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2245 |
342 | 2246 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2247 int n_completed_buffers = 0; | |
1705 | 2248 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2249 n_completed_buffers++; |
2250 } | |
2251 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2252 (double) n_completed_buffers); | |
2253 dcqs.clear_n_completed_buffers(); | |
2254 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2255 } | |
2256 | |
2257 | |
2258 // Computes the sum of the storage used by the various regions. | |
2259 | |
2260 size_t G1CollectedHeap::used() const { | |
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|
2261 assert(Heap_lock->owner() != NULL, |
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|
2262 "Should be owned on this thread's behalf."); |
342 | 2263 size_t result = _summary_bytes_used; |
845
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|
2264 // Read only once in case it is set to NULL concurrently |
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|
2265 HeapRegion* hr = _mutator_alloc_region.get(); |
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|
2266 if (hr != NULL) |
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|
2267 result += hr->used(); |
342 | 2268 return result; |
2269 } | |
2270 | |
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|
2271 size_t G1CollectedHeap::used_unlocked() const { |
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|
2272 size_t result = _summary_bytes_used; |
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|
2273 return result; |
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|
2274 } |
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|
2275 |
342 | 2276 class SumUsedClosure: public HeapRegionClosure { |
2277 size_t _used; | |
2278 public: | |
2279 SumUsedClosure() : _used(0) {} | |
2280 bool doHeapRegion(HeapRegion* r) { | |
2281 if (!r->continuesHumongous()) { | |
2282 _used += r->used(); | |
2283 } | |
2284 return false; | |
2285 } | |
2286 size_t result() { return _used; } | |
2287 }; | |
2288 | |
2289 size_t G1CollectedHeap::recalculate_used() const { | |
2290 SumUsedClosure blk; | |
3766 | 2291 heap_region_iterate(&blk); |
342 | 2292 return blk.result(); |
2293 } | |
2294 | |
2295 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2296 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2297 // otherwise, is there space in the current allocation region? |
2298 | |
2299 // We need to store the current allocation region in a local variable | |
2300 // here. The problem is that this method doesn't take any locks and | |
2301 // there may be other threads which overwrite the current allocation | |
2302 // region field. attempt_allocation(), for example, sets it to NULL | |
2303 // and this can happen *after* the NULL check here but before the call | |
2304 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2305 // to be a problem in the optimized build, since the two loads of the | |
2306 // current allocation region field are optimized away. | |
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abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2307 HeapRegion* hr = _mutator_alloc_region.get(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2308 if (hr == NULL) { |
342 | 2309 return 0; |
2310 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2311 return hr->free(); |
342 | 2312 } |
2313 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2314 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2315 switch (cause) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2316 case GCCause::_gc_locker: return GCLockerInvokesConcurrent; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2317 case GCCause::_java_lang_system_gc: return ExplicitGCInvokesConcurrent; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2318 case GCCause::_g1_humongous_allocation: return true; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2319 default: return false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2320 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2321 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2322 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2323 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2324 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2325 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2326 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2327 // 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
|
2328 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2329 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2330 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2331 // 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
|
2332 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2333 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2334 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2335 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2336 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2337 // 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
|
2338 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2339 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2340 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2341 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2342 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2343 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2344 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2345 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2346 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2347 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2348 // 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
|
2349 // 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
|
2350 // 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
|
2351 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2352 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2353 // 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
|
2354 // 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
|
2355 // collections have been started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2356 unsigned int full_collections_started = total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2357 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2358 // 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
|
2359 // 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
|
2360 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2361 // 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
|
2362 // 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
|
2363 // behind the number of full collections started. |
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 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
|
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) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2368 (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
|
2369 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
|
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 // 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
|
2374 assert(!concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2375 (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
|
2376 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
|
2377 "full_collections_started = %u " |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2378 "is inconsistent with _full_collections_completed = %u", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2379 full_collections_started, _full_collections_completed)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2380 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2381 _full_collections_completed += 1; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2382 |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2383 // 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
|
2384 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2385 // 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
|
2386 // 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
|
2387 if (concurrent) { |
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2388 _cmThread->clear_in_progress(); |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2389 } |
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2390 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2391 // 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
|
2392 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2393 // 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
|
2394 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2395 FullGCCount_lock->notify_all(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2396 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2397 |
342 | 2398 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2399 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2400 GCCauseSetter gcs(this, cause); |
2401 switch (cause) { | |
2402 case GCCause::_heap_inspection: | |
2403 case GCCause::_heap_dump: { | |
2404 HandleMark hm; | |
2405 do_full_collection(false); // don't clear all soft refs | |
2406 break; | |
2407 } | |
2408 default: // XXX FIX ME | |
2409 ShouldNotReachHere(); // Unexpected use of this function | |
2410 } | |
2411 } | |
2412 | |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2413 void G1CollectedHeap::collect(GCCause::Cause cause) { |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2414 assert_heap_not_locked(); |
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2415 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2416 unsigned int gc_count_before; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2417 unsigned int full_gc_count_before; |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2418 bool retry_gc; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2419 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2420 do { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2421 retry_gc = false; |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2422 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2423 { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2424 MutexLocker ml(Heap_lock); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2425 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2426 // Read the GC count while holding the Heap_lock |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2427 gc_count_before = total_collections(); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2428 full_gc_count_before = total_full_collections(); |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2429 } |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2430 |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2431 if (should_do_concurrent_full_gc(cause)) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2432 // Schedule an initial-mark evacuation pause that will start a |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2433 // concurrent cycle. We're setting word_size to 0 which means that |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2434 // 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 */ |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2437 true, /* should_initiate_conc_mark */ |
1656
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); |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2441 if (!op.pause_succeeded()) { |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2442 // Another GC got scheduled and prevented us from scheduling |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2443 // the initial-mark GC. It's unlikely that the GC that |
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2444 // pre-empted us was also an initial-mark GC. So, we'll retry |
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2445 // the initial-mark GC. |
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2446 |
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2447 if (full_gc_count_before == total_full_collections()) { |
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2448 retry_gc = true; |
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2449 } else { |
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2450 // A Full GC happened while we were trying to schedule the |
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2451 // initial-mark GC. No point in starting a new cycle given |
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2452 // that the whole heap was collected anyway. |
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2453 } |
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2454 } |
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2455 } else { |
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2456 if (cause == GCCause::_gc_locker |
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2457 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2458 |
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2459 // Schedule a standard evacuation pause. We're setting word_size |
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2460 // to 0 which means that we are not requesting a post-GC allocation. |
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2461 VM_G1IncCollectionPause op(gc_count_before, |
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2462 0, /* word_size */ |
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2463 false, /* should_initiate_conc_mark */ |
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2464 g1_policy()->max_pause_time_ms(), |
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2465 cause); |
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2466 VMThread::execute(&op); |
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2467 } else { |
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2468 // Schedule a Full GC. |
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2469 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2470 VMThread::execute(&op); |
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2471 } |
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2472 } |
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2473 } while (retry_gc); |
342 | 2474 } |
2475 | |
2476 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2477 if (_g1_committed.contains(p)) { |
2478 // Given that we know that p is in the committed space, | |
2479 // heap_region_containing_raw() should successfully | |
2480 // return the containing region. | |
2481 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2482 return hr->is_in(p); |
2483 } else { | |
2484 return _perm_gen->as_gen()->is_in(p); | |
2485 } | |
2486 } | |
2487 | |
2488 // Iteration functions. | |
2489 | |
2490 // Iterates an OopClosure over all ref-containing fields of objects | |
2491 // within a HeapRegion. | |
2492 | |
2493 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2494 MemRegion _mr; | |
2495 OopClosure* _cl; | |
2496 public: | |
2497 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2498 : _mr(mr), _cl(cl) {} | |
2499 bool doHeapRegion(HeapRegion* r) { | |
2500 if (! r->continuesHumongous()) { | |
2501 r->oop_iterate(_cl); | |
2502 } | |
2503 return false; | |
2504 } | |
2505 }; | |
2506 | |
678 | 2507 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2508 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2509 heap_region_iterate(&blk); |
678 | 2510 if (do_perm) { |
2511 perm_gen()->oop_iterate(cl); | |
2512 } | |
342 | 2513 } |
2514 | |
678 | 2515 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2516 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2517 heap_region_iterate(&blk); |
678 | 2518 if (do_perm) { |
2519 perm_gen()->oop_iterate(cl); | |
2520 } | |
342 | 2521 } |
2522 | |
2523 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2524 | |
2525 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2526 ObjectClosure* _cl; | |
2527 public: | |
2528 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2529 bool doHeapRegion(HeapRegion* r) { | |
2530 if (! r->continuesHumongous()) { | |
2531 r->object_iterate(_cl); | |
2532 } | |
2533 return false; | |
2534 } | |
2535 }; | |
2536 | |
678 | 2537 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2538 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2539 heap_region_iterate(&blk); |
678 | 2540 if (do_perm) { |
2541 perm_gen()->object_iterate(cl); | |
2542 } | |
342 | 2543 } |
2544 | |
2545 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2546 // FIXME: is this right? | |
2547 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2548 } | |
2549 | |
2550 // Calls a SpaceClosure on a HeapRegion. | |
2551 | |
2552 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2553 SpaceClosure* _cl; | |
2554 public: | |
2555 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2556 bool doHeapRegion(HeapRegion* r) { | |
2557 _cl->do_space(r); | |
2558 return false; | |
2559 } | |
2560 }; | |
2561 | |
2562 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2563 SpaceClosureRegionClosure blk(cl); | |
3766 | 2564 heap_region_iterate(&blk); |
342 | 2565 } |
2566 | |
3766 | 2567 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2568 _hrs.iterate(cl); | |
342 | 2569 } |
2570 | |
2571 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2572 HeapRegionClosure* cl) const { |
2573 _hrs.iterate_from(r, cl); | |
342 | 2574 } |
2575 | |
2576 void | |
2577 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
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2578 uint worker, |
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2579 uint no_of_par_workers, |
342 | 2580 jint claim_value) { |
355 | 2581 const size_t regions = n_regions(); |
4728
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2582 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2583 no_of_par_workers : |
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2584 1); |
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2585 assert(UseDynamicNumberOfGCThreads || |
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2586 no_of_par_workers == workers()->total_workers(), |
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2587 "Non dynamic should use fixed number of workers"); |
355 | 2588 // try to spread out the starting points of the workers |
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2589 const size_t start_index = regions / max_workers * (size_t) worker; |
355 | 2590 |
2591 // each worker will actually look at all regions | |
2592 for (size_t count = 0; count < regions; ++count) { | |
2593 const size_t index = (start_index + count) % regions; | |
2594 assert(0 <= index && index < regions, "sanity"); | |
2595 HeapRegion* r = region_at(index); | |
2596 // we'll ignore "continues humongous" regions (we'll process them | |
2597 // when we come across their corresponding "start humongous" | |
2598 // region) and regions already claimed | |
2599 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2600 continue; | |
2601 } | |
2602 // OK, try to claim it | |
342 | 2603 if (r->claimHeapRegion(claim_value)) { |
355 | 2604 // success! |
2605 assert(!r->continuesHumongous(), "sanity"); | |
2606 if (r->startsHumongous()) { | |
2607 // If the region is "starts humongous" we'll iterate over its | |
2608 // "continues humongous" first; in fact we'll do them | |
2609 // first. The order is important. In on case, calling the | |
2610 // closure on the "starts humongous" region might de-allocate | |
2611 // and clear all its "continues humongous" regions and, as a | |
2612 // result, we might end up processing them twice. So, we'll do | |
2613 // them first (notice: most closures will ignore them anyway) and | |
2614 // then we'll do the "starts humongous" region. | |
2615 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2616 HeapRegion* chr = region_at(ch_index); | |
2617 | |
2618 // if the region has already been claimed or it's not | |
2619 // "continues humongous" we're done | |
2620 if (chr->claim_value() == claim_value || | |
2621 !chr->continuesHumongous()) { | |
2622 break; | |
2623 } | |
2624 | |
2625 // Noone should have claimed it directly. We can given | |
2626 // that we claimed its "starts humongous" region. | |
2627 assert(chr->claim_value() != claim_value, "sanity"); | |
2628 assert(chr->humongous_start_region() == r, "sanity"); | |
2629 | |
2630 if (chr->claimHeapRegion(claim_value)) { | |
2631 // we should always be able to claim it; noone else should | |
2632 // be trying to claim this region | |
2633 | |
2634 bool res2 = cl->doHeapRegion(chr); | |
2635 assert(!res2, "Should not abort"); | |
2636 | |
2637 // Right now, this holds (i.e., no closure that actually | |
2638 // does something with "continues humongous" regions | |
2639 // clears them). We might have to weaken it in the future, | |
2640 // but let's leave these two asserts here for extra safety. | |
2641 assert(chr->continuesHumongous(), "should still be the case"); | |
2642 assert(chr->humongous_start_region() == r, "sanity"); | |
2643 } else { | |
2644 guarantee(false, "we should not reach here"); | |
2645 } | |
2646 } | |
2647 } | |
2648 | |
2649 assert(!r->continuesHumongous(), "sanity"); | |
2650 bool res = cl->doHeapRegion(r); | |
2651 assert(!res, "Should not abort"); | |
2652 } | |
2653 } | |
2654 } | |
2655 | |
390 | 2656 class ResetClaimValuesClosure: public HeapRegionClosure { |
2657 public: | |
2658 bool doHeapRegion(HeapRegion* r) { | |
2659 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2660 return false; | |
2661 } | |
2662 }; | |
2663 | |
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2664 void G1CollectedHeap::reset_heap_region_claim_values() { |
390 | 2665 ResetClaimValuesClosure blk; |
2666 heap_region_iterate(&blk); | |
2667 } | |
2668 | |
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2669 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2670 ResetClaimValuesClosure blk; |
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2671 collection_set_iterate(&blk); |
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2672 } |
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2673 |
355 | 2674 #ifdef ASSERT |
2675 // This checks whether all regions in the heap have the correct claim | |
2676 // value. I also piggy-backed on this a check to ensure that the | |
2677 // humongous_start_region() information on "continues humongous" | |
2678 // regions is correct. | |
2679 | |
2680 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2681 private: | |
2682 jint _claim_value; | |
2683 size_t _failures; | |
2684 HeapRegion* _sh_region; | |
2685 public: | |
2686 CheckClaimValuesClosure(jint claim_value) : | |
2687 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2688 bool doHeapRegion(HeapRegion* r) { | |
2689 if (r->claim_value() != _claim_value) { | |
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2690 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2691 "claim value = %d, should be %d", |
4097
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2692 HR_FORMAT_PARAMS(r), |
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2693 r->claim_value(), _claim_value); |
355 | 2694 ++_failures; |
2695 } | |
2696 if (!r->isHumongous()) { | |
2697 _sh_region = NULL; | |
2698 } else if (r->startsHumongous()) { | |
2699 _sh_region = r; | |
2700 } else if (r->continuesHumongous()) { | |
2701 if (r->humongous_start_region() != _sh_region) { | |
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2702 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2703 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2704 HR_FORMAT_PARAMS(r), |
355 | 2705 r->humongous_start_region(), |
2706 _sh_region); | |
2707 ++_failures; | |
342 | 2708 } |
2709 } | |
355 | 2710 return false; |
2711 } | |
2712 size_t failures() { | |
2713 return _failures; | |
2714 } | |
2715 }; | |
2716 | |
2717 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2718 CheckClaimValuesClosure cl(claim_value); | |
2719 heap_region_iterate(&cl); | |
2720 return cl.failures() == 0; | |
2721 } | |
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2722 |
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2723 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2724 jint _claim_value; |
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2725 size_t _failures; |
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2726 |
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2727 public: |
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2728 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2729 _claim_value(claim_value), |
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2730 _failures(0) { } |
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2731 |
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2732 size_t failures() { |
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2733 return _failures; |
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2734 } |
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2735 |
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2736 bool doHeapRegion(HeapRegion* hr) { |
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2737 assert(hr->in_collection_set(), "how?"); |
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2738 assert(!hr->isHumongous(), "H-region in CSet"); |
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2739 if (hr->claim_value() != _claim_value) { |
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2740 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2741 "claim value = %d, should be %d", |
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2742 HR_FORMAT_PARAMS(hr), |
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2743 hr->claim_value(), _claim_value); |
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|
2744 _failures += 1; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2745 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2746 return false; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2747 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2748 }; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2749 |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2750 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2751 CheckClaimValuesInCSetHRClosure cl(claim_value); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2752 collection_set_iterate(&cl); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2753 return cl.failures() == 0; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2754 } |
355 | 2755 #endif // ASSERT |
342 | 2756 |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2757 // Clear the cached CSet starting regions and (more importantly) |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2758 // the time stamps. Called when we reset the GC time stamp. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2759 void G1CollectedHeap::clear_cset_start_regions() { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2760 assert(_worker_cset_start_region != NULL, "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2761 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2762 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2763 int n_queues = MAX2((int)ParallelGCThreads, 1); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2764 for (int i = 0; i < n_queues; i++) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2765 _worker_cset_start_region[i] = NULL; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2766 _worker_cset_start_region_time_stamp[i] = 0; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2767 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2768 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2769 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2770 // Given the id of a worker, obtain or calculate a suitable |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2771 // starting region for iterating over the current collection set. |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2772 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2773 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2774 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2775 HeapRegion* result = NULL; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2776 unsigned gc_time_stamp = get_gc_time_stamp(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2777 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2778 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
|
2779 // 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
|
2780 // 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
|
2781 // 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
|
2782 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2783 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
|
2784 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
|
2785 return result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2786 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2787 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2788 // 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
|
2789 // 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
|
2790 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2791 // 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
|
2792 // 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
|
2793 // avoid contention. |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2794 // If we have: |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2795 // n collection set regions |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2796 // p threads |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2797 // 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
|
2798 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2799 result = g1_policy()->collection_set(); |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2800 if (G1CollectedHeap::use_parallel_gc_threads()) { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2801 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
|
2802 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
|
2803 assert(UseDynamicNumberOfGCThreads || |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2804 active_workers == workers()->total_workers(), |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2805 "Unless dynamic should use total workers"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2806 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2807 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
|
2808 size_t start_ind = 0; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2809 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2810 if (worker_i > 0 && |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2811 _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
|
2812 // Previous workers starting region is valid |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2813 // so let's iterate from there |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2814 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
|
2815 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
|
2816 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2817 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2818 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
|
2819 result = result->next_in_collection_set(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2820 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2821 } |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2822 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2823 // 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
|
2824 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2825 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
|
2826 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
|
2827 "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
|
2828 _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
|
2829 OrderAccess::storestore(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2830 _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
|
2831 return result; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2832 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2833 |
342 | 2834 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2835 HeapRegion* r = g1_policy()->collection_set(); | |
2836 while (r != NULL) { | |
2837 HeapRegion* next = r->next_in_collection_set(); | |
2838 if (cl->doHeapRegion(r)) { | |
2839 cl->incomplete(); | |
2840 return; | |
2841 } | |
2842 r = next; | |
2843 } | |
2844 } | |
2845 | |
2846 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2847 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2848 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2849 // 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
|
2850 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2851 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2852 |
342 | 2853 assert(r->in_collection_set(), |
2854 "Start region must be a member of the collection set."); | |
2855 HeapRegion* cur = r; | |
2856 while (cur != NULL) { | |
2857 HeapRegion* next = cur->next_in_collection_set(); | |
2858 if (cl->doHeapRegion(cur) && false) { | |
2859 cl->incomplete(); | |
2860 return; | |
2861 } | |
2862 cur = next; | |
2863 } | |
2864 cur = g1_policy()->collection_set(); | |
2865 while (cur != r) { | |
2866 HeapRegion* next = cur->next_in_collection_set(); | |
2867 if (cl->doHeapRegion(cur) && false) { | |
2868 cl->incomplete(); | |
2869 return; | |
2870 } | |
2871 cur = next; | |
2872 } | |
2873 } | |
2874 | |
2875 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2876 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2877 } |
2878 | |
2879 | |
2880 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2881 Space* res = heap_region_containing(addr); | |
2882 if (res == NULL) | |
2883 res = perm_gen()->space_containing(addr); | |
2884 return res; | |
2885 } | |
2886 | |
2887 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2888 Space* sp = space_containing(addr); | |
2889 if (sp != NULL) { | |
2890 return sp->block_start(addr); | |
2891 } | |
2892 return NULL; | |
2893 } | |
2894 | |
2895 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2896 Space* sp = space_containing(addr); | |
2897 assert(sp != NULL, "block_size of address outside of heap"); | |
2898 return sp->block_size(addr); | |
2899 } | |
2900 | |
2901 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2902 Space* sp = space_containing(addr); | |
2903 return sp->block_is_obj(addr); | |
2904 } | |
2905 | |
2906 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2907 return true; | |
2908 } | |
2909 | |
2910 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2911 return HeapRegion::GrainBytes; | |
2912 } | |
2913 | |
2914 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2915 // Return the remaining space in the cur alloc region, but not less than | |
2916 // the min TLAB size. | |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2917 |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2918 // 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
|
2919 // 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
|
2920 // humongous objects. |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2921 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2922 HeapRegion* hr = _mutator_alloc_region.get(); |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2923 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
|
2924 if (hr == NULL) { |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2925 return max_tlab_size; |
342 | 2926 } else { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2927 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2928 } |
2929 } | |
2930 | |
2931 size_t G1CollectedHeap::max_capacity() const { | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2932 return _g1_reserved.byte_size(); |
342 | 2933 } |
2934 | |
2935 jlong G1CollectedHeap::millis_since_last_gc() { | |
2936 // assert(false, "NYI"); | |
2937 return 0; | |
2938 } | |
2939 | |
2940 void G1CollectedHeap::prepare_for_verify() { | |
2941 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2942 ensure_parsability(false); | |
2943 } | |
2944 g1_rem_set()->prepare_for_verify(); | |
2945 } | |
2946 | |
2947 class VerifyLivenessOopClosure: public OopClosure { | |
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2948 G1CollectedHeap* _g1h; |
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2949 VerifyOption _vo; |
342 | 2950 public: |
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2951 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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2952 _g1h(g1h), _vo(vo) |
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2953 { } |
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2954 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2955 void do_oop( oop *p) { do_oop_work(p); } |
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2956 |
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2957 template <class T> void do_oop_work(T *p) { |
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2958 oop obj = oopDesc::load_decode_heap_oop(p); |
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2959 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
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2960 "Dead object referenced by a not dead object"); |
342 | 2961 } |
2962 }; | |
2963 | |
2964 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2965 private: |
342 | 2966 G1CollectedHeap* _g1h; |
2967 size_t _live_bytes; | |
2968 HeapRegion *_hr; | |
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2969 VerifyOption _vo; |
342 | 2970 public: |
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2971 // _vo == UsePrevMarking -> use "prev" marking information, |
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2972 // _vo == UseNextMarking -> use "next" marking information, |
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2973 // _vo == UseMarkWord -> use mark word from object header. |
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2974 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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2975 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2976 _g1h = G1CollectedHeap::heap(); |
2977 } | |
2978 void do_object(oop o) { | |
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2979 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2980 assert(o != NULL, "Huh?"); |
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2981 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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2982 // If the object is alive according to the mark word, |
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2983 // then verify that the marking information agrees. |
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2984 // Note we can't verify the contra-positive of the |
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2985 // above: if the object is dead (according to the mark |
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2986 // word), it may not be marked, or may have been marked |
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2987 // but has since became dead, or may have been allocated |
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2988 // since the last marking. |
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2989 if (_vo == VerifyOption_G1UseMarkWord) { |
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2990 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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2991 } |
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2992 |
342 | 2993 o->oop_iterate(&isLive); |
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2994 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2995 size_t obj_size = o->size(); // Make sure we don't overflow |
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2996 _live_bytes += (obj_size * HeapWordSize); |
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2997 } |
342 | 2998 } |
2999 } | |
3000 size_t live_bytes() { return _live_bytes; } | |
3001 }; | |
3002 | |
3003 class PrintObjsInRegionClosure : public ObjectClosure { | |
3004 HeapRegion *_hr; | |
3005 G1CollectedHeap *_g1; | |
3006 public: | |
3007 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
3008 _g1 = G1CollectedHeap::heap(); | |
3009 }; | |
3010 | |
3011 void do_object(oop o) { | |
3012 if (o != NULL) { | |
3013 HeapWord *start = (HeapWord *) o; | |
3014 size_t word_sz = o->size(); | |
3015 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
3016 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
3017 (void*) o, word_sz, | |
3018 _g1->isMarkedPrev(o), | |
3019 _g1->isMarkedNext(o), | |
3020 _hr->obj_allocated_since_prev_marking(o)); | |
3021 HeapWord *end = start + word_sz; | |
3022 HeapWord *cur; | |
3023 int *val; | |
3024 for (cur = start; cur < end; cur++) { | |
3025 val = (int *) cur; | |
3026 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
3027 } | |
3028 } | |
3029 } | |
3030 }; | |
3031 | |
3032 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 3033 private: |
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3034 bool _allow_dirty; |
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3035 bool _par; |
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3036 VerifyOption _vo; |
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3037 bool _failures; |
811 | 3038 public: |
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3039 // _vo == UsePrevMarking -> use "prev" marking information, |
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3040 // _vo == UseNextMarking -> use "next" marking information, |
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3041 // _vo == UseMarkWord -> use mark word from object header. |
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3042 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
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3043 : _allow_dirty(allow_dirty), |
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3044 _par(par), |
3772
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3045 _vo(vo), |
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3046 _failures(false) {} |
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|
3047 |
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3048 bool failures() { |
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3049 return _failures; |
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3050 } |
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3051 |
342 | 3052 bool doHeapRegion(HeapRegion* r) { |
390 | 3053 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
3054 "Should be unclaimed at verify points."); | |
637
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|
3055 if (!r->continuesHumongous()) { |
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|
3056 bool failures = false; |
3772
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3057 r->verify(_allow_dirty, _vo, &failures); |
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3058 if (failures) { |
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|
3059 _failures = true; |
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|
3060 } else { |
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|
3061 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
1020
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|
3062 r->object_iterate(¬_dead_yet_cl); |
4787
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|
3063 if (_vo != VerifyOption_G1UseNextMarking) { |
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|
3064 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
3065 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
3066 "max_live_bytes "SIZE_FORMAT" " |
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changeset
|
3067 "< calculated "SIZE_FORMAT, |
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|
3068 r->bottom(), r->end(), |
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|
3069 r->max_live_bytes(), |
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|
3070 not_dead_yet_cl.live_bytes()); |
4787
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|
3071 _failures = true; |
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|
3072 } |
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|
3073 } else { |
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|
3074 // When vo == UseNextMarking we cannot currently do a sanity |
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|
3075 // check on the live bytes as the calculation has not been |
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|
3076 // finalized yet. |
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|
3077 } |
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|
3078 } |
342 | 3079 } |
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|
3080 return false; // stop the region iteration if we hit a failure |
342 | 3081 } |
3082 }; | |
3083 | |
3084 class VerifyRootsClosure: public OopsInGenClosure { | |
3085 private: | |
3086 G1CollectedHeap* _g1h; | |
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|
3087 VerifyOption _vo; |
342 | 3088 bool _failures; |
3089 public: | |
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|
3090 // _vo == UsePrevMarking -> use "prev" marking information, |
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3091 // _vo == UseNextMarking -> use "next" marking information, |
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3092 // _vo == UseMarkWord -> use mark word from object header. |
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|
3093 VerifyRootsClosure(VerifyOption vo) : |
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3094 _g1h(G1CollectedHeap::heap()), |
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|
3095 _vo(vo), |
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|
3096 _failures(false) { } |
342 | 3097 |
3098 bool failures() { return _failures; } | |
3099 | |
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|
3100 template <class T> void do_oop_nv(T* p) { |
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3101 T heap_oop = oopDesc::load_heap_oop(p); |
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3102 if (!oopDesc::is_null(heap_oop)) { |
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3103 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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3104 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 3105 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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|
3106 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
3772
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|
3107 if (_vo == VerifyOption_G1UseMarkWord) { |
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|
3108 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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|
3109 } |
342 | 3110 obj->print_on(gclog_or_tty); |
3111 _failures = true; | |
3112 } | |
3113 } | |
3114 } | |
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|
3115 |
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3116 void do_oop(oop* p) { do_oop_nv(p); } |
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3117 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 3118 }; |
3119 | |
390 | 3120 // This is the task used for parallel heap verification. |
3121 | |
3122 class G1ParVerifyTask: public AbstractGangTask { | |
3123 private: | |
3124 G1CollectedHeap* _g1h; | |
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|
3125 bool _allow_dirty; |
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|
3126 VerifyOption _vo; |
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|
3127 bool _failures; |
390 | 3128 |
3129 public: | |
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|
3130 // _vo == UsePrevMarking -> use "prev" marking information, |
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3131 // _vo == UseNextMarking -> use "next" marking information, |
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3132 // _vo == UseMarkWord -> use mark word from object header. |
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|
3133 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 3134 AbstractGangTask("Parallel verify task"), |
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3135 _g1h(g1h), |
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3136 _allow_dirty(allow_dirty), |
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3137 _vo(vo), |
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3138 _failures(false) { } |
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3139 |
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|
3140 bool failures() { |
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3141 return _failures; |
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|
3142 } |
390 | 3143 |
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|
3144 void work(uint worker_id) { |
637
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|
3145 HandleMark hm; |
3772
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3146 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
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|
3147 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
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3148 _g1h->workers()->active_workers(), |
390 | 3149 HeapRegion::ParVerifyClaimValue); |
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3150 if (blk.failures()) { |
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3151 _failures = true; |
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3152 } |
390 | 3153 } |
3154 }; | |
3155 | |
342 | 3156 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
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3157 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 3158 } |
3159 | |
3160 void G1CollectedHeap::verify(bool allow_dirty, | |
3161 bool silent, | |
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3162 VerifyOption vo) { |
342 | 3163 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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3164 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
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3165 VerifyRootsClosure rootsCl(vo); |
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3166 |
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3167 assert(Thread::current()->is_VM_thread(), |
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3168 "Expected to be executed serially by the VM thread at this point"); |
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3169 |
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3170 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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3171 |
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3172 // We apply the relevant closures to all the oops in the |
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|
3173 // system dictionary, the string table and the code cache. |
4910
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|
3174 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
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|
3175 |
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|
3176 process_strong_roots(true, // activate StrongRootsScope |
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|
3177 true, // we set "collecting perm gen" to true, |
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|
3178 // so we don't reset the dirty cards in the perm gen. |
4910
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|
3179 ScanningOption(so), // roots scanning options |
342 | 3180 &rootsCl, |
989
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|
3181 &blobsCl, |
342 | 3182 &rootsCl); |
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|
3183 |
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|
3184 // If we're verifying after the marking phase of a Full GC then we can't |
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|
3185 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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|
3186 // the perm gen may be dead and hence not marked. If one of these dead |
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|
3187 // objects is considered to be a root then we may end up with a false |
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|
3188 // "Root location <x> points to dead ob <y>" failure. |
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|
3189 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3190 // Since we used "collecting_perm_gen" == true above, we will not have |
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|
3191 // checked the refs from perm into the G1-collected heap. We check those |
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|
3192 // references explicitly below. Whether the relevant cards are dirty |
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|
3193 // is checked further below in the rem set verification. |
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|
3194 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
3195 perm_gen()->oop_iterate(&rootsCl); |
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|
3196 } |
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|
3197 bool failures = rootsCl.failures(); |
3772
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|
3198 |
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|
3199 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3200 // If we're verifying during a full GC then the region sets |
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|
3201 // will have been torn down at the start of the GC. Therefore |
6747fd0512e0
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|
3202 // verifying the region sets will fail. So we only verify |
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diff
changeset
|
3203 // the region sets when not in a full GC. |
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changeset
|
3204 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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changeset
|
3205 verify_region_sets(); |
6747fd0512e0
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changeset
|
3206 } |
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|
3207 |
2152 | 3208 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3209 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3210 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3211 "sanity check"); | |
3212 | |
3772
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|
3213 G1ParVerifyTask task(this, allow_dirty, vo); |
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|
3214 assert(UseDynamicNumberOfGCThreads || |
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|
3215 workers()->active_workers() == workers()->total_workers(), |
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|
3216 "If not dynamic should be using all the workers"); |
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|
3217 int n_workers = workers()->active_workers(); |
390 | 3218 set_par_threads(n_workers); |
3219 workers()->run_task(&task); | |
3220 set_par_threads(0); | |
1020
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|
3221 if (task.failures()) { |
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|
3222 failures = true; |
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|
3223 } |
390 | 3224 |
4095
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|
3225 // Checks that the expected amount of parallel work was done. |
bca17e38de00
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|
3226 // The implication is that n_workers is > 0. |
390 | 3227 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3228 "sanity check"); | |
3229 | |
3230 reset_heap_region_claim_values(); | |
3231 | |
3232 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3233 "sanity check"); | |
3234 } else { | |
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changeset
|
3235 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 3236 heap_region_iterate(&blk); |
1020
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|
3237 if (blk.failures()) { |
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|
3238 failures = true; |
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|
3239 } |
390 | 3240 } |
2152 | 3241 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3242 rem_set()->verify(); |
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|
3243 |
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|
3244 if (failures) { |
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|
3245 gclog_or_tty->print_cr("Heap:"); |
4073
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|
3246 // It helps to have the per-region information in the output to |
53074c2c4600
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diff
changeset
|
3247 // help us track down what went wrong. This is why we call |
53074c2c4600
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diff
changeset
|
3248 // print_extended_on() instead of print_on(). |
53074c2c4600
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diff
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|
3249 print_extended_on(gclog_or_tty); |
1020
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|
3250 gclog_or_tty->print_cr(""); |
1547
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jcoomes
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1545
diff
changeset
|
3251 #ifndef PRODUCT |
1044 | 3252 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3253 concurrent_mark()->print_reachable("at-verification-failure", |
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|
3254 vo, false /* all */); |
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|
3255 } |
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1545
diff
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|
3256 #endif |
1020
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|
3257 gclog_or_tty->flush(); |
ff2402f6a50b
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diff
changeset
|
3258 } |
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|
3259 guarantee(!failures, "there should not have been any failures"); |
342 | 3260 } else { |
3261 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3262 } | |
3263 } | |
3264 | |
3265 class PrintRegionClosure: public HeapRegionClosure { | |
3266 outputStream* _st; | |
3267 public: | |
3268 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3269 bool doHeapRegion(HeapRegion* r) { | |
3270 r->print_on(_st); | |
3271 return false; | |
3272 } | |
3273 }; | |
3274 | |
3275 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
0316eac49d5a
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|
3276 st->print(" %-20s", "garbage-first heap"); |
0316eac49d5a
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diff
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|
3277 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")
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diff
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|
3278 capacity()/K, used_unlocked()/K); |
838
0316eac49d5a
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diff
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|
3279 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
0316eac49d5a
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|
3280 _g1_storage.low_boundary(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3281 _g1_storage.high(), |
0316eac49d5a
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diff
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|
3282 _g1_storage.high_boundary()); |
0316eac49d5a
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diff
changeset
|
3283 st->cr(); |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3983
diff
changeset
|
3284 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
838
0316eac49d5a
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|
3285 size_t young_regions = _young_list->length(); |
0316eac49d5a
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diff
changeset
|
3286 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
0316eac49d5a
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|
3287 young_regions, young_regions * HeapRegion::GrainBytes / K); |
0316eac49d5a
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|
3288 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
0316eac49d5a
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diff
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|
3289 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
0316eac49d5a
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diff
changeset
|
3290 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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|
3291 st->cr(); |
0316eac49d5a
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changeset
|
3292 perm()->as_gen()->print_on(st); |
4073
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diff
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|
3293 } |
53074c2c4600
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|
3294 |
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3295 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
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3296 print_on(st); |
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3297 |
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3298 // Print the per-region information. |
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3299 st->cr(); |
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3300 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 | 3301 PrintRegionClosure blk(st); |
3766 | 3302 heap_region_iterate(&blk); |
342 | 3303 } |
3304 | |
3305 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
1833
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3306 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3307 workers()->print_worker_threads_on(st); |
3308 } | |
3309 _cmThread->print_on(st); | |
342 | 3310 st->cr(); |
1019 | 3311 _cm->print_worker_threads_on(st); |
3312 _cg1r->print_worker_threads_on(st); | |
342 | 3313 st->cr(); |
3314 } | |
3315 | |
3316 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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3317 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3318 workers()->threads_do(tc); |
3319 } | |
3320 tc->do_thread(_cmThread); | |
794 | 3321 _cg1r->threads_do(tc); |
342 | 3322 } |
3323 | |
3324 void G1CollectedHeap::print_tracing_info() const { | |
3325 // We'll overload this to mean "trace GC pause statistics." | |
3326 if (TraceGen0Time || TraceGen1Time) { | |
3327 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3328 // to that. | |
3329 g1_policy()->print_tracing_info(); | |
3330 } | |
751 | 3331 if (G1SummarizeRSetStats) { |
342 | 3332 g1_rem_set()->print_summary_info(); |
3333 } | |
1282 | 3334 if (G1SummarizeConcMark) { |
342 | 3335 concurrent_mark()->print_summary_info(); |
3336 } | |
3337 g1_policy()->print_yg_surv_rate_info(); | |
3338 SpecializationStats::print(); | |
3339 } | |
3340 | |
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3341 #ifndef PRODUCT |
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3342 // Helpful for debugging RSet issues. |
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3343 |
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3344 class PrintRSetsClosure : public HeapRegionClosure { |
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3345 private: |
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3346 const char* _msg; |
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3347 size_t _occupied_sum; |
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3348 |
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3349 public: |
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3350 bool doHeapRegion(HeapRegion* r) { |
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3351 HeapRegionRemSet* hrrs = r->rem_set(); |
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3352 size_t occupied = hrrs->occupied(); |
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3353 _occupied_sum += occupied; |
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3354 |
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3355 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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3356 HR_FORMAT_PARAMS(r)); |
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3357 if (occupied == 0) { |
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3358 gclog_or_tty->print_cr(" RSet is empty"); |
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3359 } else { |
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3360 hrrs->print(); |
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3361 } |
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3362 gclog_or_tty->print_cr("----------"); |
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3363 return false; |
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|
3364 } |
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3365 |
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3366 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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3367 gclog_or_tty->cr(); |
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3368 gclog_or_tty->print_cr("========================================"); |
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3369 gclog_or_tty->print_cr(msg); |
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3370 gclog_or_tty->cr(); |
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3371 } |
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3372 |
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3373 ~PrintRSetsClosure() { |
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3374 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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3375 gclog_or_tty->print_cr("========================================"); |
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3376 gclog_or_tty->cr(); |
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3377 } |
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3378 }; |
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3379 |
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3380 void G1CollectedHeap::print_cset_rsets() { |
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3381 PrintRSetsClosure cl("Printing CSet RSets"); |
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3382 collection_set_iterate(&cl); |
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3383 } |
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3384 |
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3385 void G1CollectedHeap::print_all_rsets() { |
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3386 PrintRSetsClosure cl("Printing All RSets");; |
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3387 heap_region_iterate(&cl); |
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|
3388 } |
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3389 #endif // PRODUCT |
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3390 |
342 | 3391 G1CollectedHeap* G1CollectedHeap::heap() { |
3392 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3393 "not a garbage-first heap"); | |
3394 return _g1h; | |
3395 } | |
3396 | |
3397 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3398 // always_do_update_barrier = false; |
342 | 3399 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3400 // Call allocation profiler | |
3401 AllocationProfiler::iterate_since_last_gc(); | |
3402 // Fill TLAB's and such | |
3403 ensure_parsability(true); | |
3404 } | |
3405 | |
3406 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3407 // FIXME: what is this about? | |
3408 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3409 // is set. | |
3410 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3411 "derived pointer present")); | |
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3412 // always_do_update_barrier = true; |
3979
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3413 |
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3414 // We have just completed a GC. Update the soft reference |
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|
3415 // policy with the new heap occupancy |
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3416 Universe::update_heap_info_at_gc(); |
342 | 3417 } |
3418 | |
1973 | 3419 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3420 unsigned int gc_count_before, | |
3421 bool* succeeded) { | |
3422 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3423 g1_policy()->record_stop_world_start(); |
1973 | 3424 VM_G1IncCollectionPause op(gc_count_before, |
3425 word_size, | |
3426 false, /* should_initiate_conc_mark */ | |
3427 g1_policy()->max_pause_time_ms(), | |
3428 GCCause::_g1_inc_collection_pause); | |
3429 VMThread::execute(&op); | |
3430 | |
3431 HeapWord* result = op.result(); | |
3432 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3433 assert(result == NULL || ret_succeeded, | |
3434 "the result should be NULL if the VM did not succeed"); | |
3435 *succeeded = ret_succeeded; | |
3436 | |
3437 assert_heap_not_locked(); | |
3438 return result; | |
342 | 3439 } |
3440 | |
3441 void | |
3442 G1CollectedHeap::doConcurrentMark() { | |
845
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3443 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3444 if (!_cmThread->in_progress()) { |
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3445 _cmThread->set_started(); |
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3446 CGC_lock->notify(); |
342 | 3447 } |
3448 } | |
3449 | |
3450 size_t G1CollectedHeap::pending_card_num() { | |
3451 size_t extra_cards = 0; | |
3452 JavaThread *curr = Threads::first(); | |
3453 while (curr != NULL) { | |
3454 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3455 extra_cards += dcq.size(); | |
3456 curr = curr->next(); | |
3457 } | |
3458 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3459 size_t buffer_size = dcqs.buffer_size(); | |
3460 size_t buffer_num = dcqs.completed_buffers_num(); | |
3461 return buffer_size * buffer_num + extra_cards; | |
3462 } | |
3463 | |
3464 size_t G1CollectedHeap::max_pending_card_num() { | |
3465 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3466 size_t buffer_size = dcqs.buffer_size(); | |
3467 size_t buffer_num = dcqs.completed_buffers_num(); | |
3468 int thread_num = Threads::number_of_threads(); | |
3469 return (buffer_num + thread_num) * buffer_size; | |
3470 } | |
3471 | |
3472 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3473 return g1_rem_set()->cardsScanned(); |
342 | 3474 } |
3475 | |
3476 void | |
3477 G1CollectedHeap::setup_surviving_young_words() { | |
3478 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
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3479 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3480 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
3481 if (_surviving_young_words == NULL) { | |
3482 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3483 "Not enough space for young surv words summary."); | |
3484 } | |
3485 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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3486 #ifdef ASSERT |
342 | 3487 for (size_t i = 0; i < array_length; ++i) { |
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3488 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3489 } |
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3490 #endif // !ASSERT |
342 | 3491 } |
3492 | |
3493 void | |
3494 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3495 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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3496 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3497 for (size_t i = 0; i < array_length; ++i) |
3498 _surviving_young_words[i] += surv_young_words[i]; | |
3499 } | |
3500 | |
3501 void | |
3502 G1CollectedHeap::cleanup_surviving_young_words() { | |
3503 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3504 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3505 _surviving_young_words = NULL; | |
3506 } | |
3507 | |
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3508 #ifdef ASSERT |
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3509 class VerifyCSetClosure: public HeapRegionClosure { |
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3510 public: |
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|
3511 bool doHeapRegion(HeapRegion* hr) { |
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3512 // Here we check that the CSet region's RSet is ready for parallel |
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3513 // iteration. The fields that we'll verify are only manipulated |
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3514 // when the region is part of a CSet and is collected. Afterwards, |
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3515 // we reset these fields when we clear the region's RSet (when the |
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3516 // region is freed) so they are ready when the region is |
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3517 // re-allocated. The only exception to this is if there's an |
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3518 // evacuation failure and instead of freeing the region we leave |
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3519 // it in the heap. In that case, we reset these fields during |
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|
3520 // evacuation failure handling. |
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|
3521 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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3522 |
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3523 // Here's a good place to add any other checks we'd like to |
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|
3524 // perform on CSet regions. |
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|
3525 return false; |
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|
3526 } |
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|
3527 }; |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3528 #endif // ASSERT |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3529 |
1709 | 3530 #if TASKQUEUE_STATS |
3531 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3532 st->print_raw_cr("GC Task Stats"); | |
3533 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3534 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3535 } | |
3536 | |
3537 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3538 print_taskqueue_stats_hdr(st); | |
3539 | |
3540 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3541 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3542 for (int i = 0; i < n; ++i) { |
3543 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3544 totals += task_queue(i)->stats; | |
3545 } | |
3546 st->print_raw("tot "); totals.print(st); st->cr(); | |
3547 | |
3548 DEBUG_ONLY(totals.verify()); | |
3549 } | |
3550 | |
3551 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3552 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3553 for (int i = 0; i < n; ++i) { |
3554 task_queue(i)->stats.reset(); | |
3555 } | |
3556 } | |
3557 #endif // TASKQUEUE_STATS | |
3558 | |
1973 | 3559 bool |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3560 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3561 assert_at_safepoint(true /* should_be_vm_thread */); |
3562 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3563 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3564 if (GC_locker::check_active_before_gc()) { |
1973 | 3565 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3566 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3567 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3568 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3569 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3570 |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3571 print_heap_before_gc(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3572 |
4072 | 3573 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3574 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3575 verify_dirty_young_regions(); |
2152 | 3576 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3577 // This call will decide whether this pause is an initial-mark |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3578 // 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
changeset
|
3579 // for the duration of this pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3580 g1_policy()->decide_on_conc_mark_initiation(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3581 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3582 // 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
|
3583 assert(!g1_policy()->during_initial_mark_pause() || |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3584 g1_policy()->gcs_are_young(), "sanity"); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3585 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3586 // We also do not allow mixed GCs during marking. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3587 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
|
3588 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3589 // Record whether this pause is an initial mark. When the current |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3590 // thread has completed its logging output and it's safe to signal |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3591 // 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
|
3592 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
|
3593 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3594 // Inner scope for scope based logging, timers, and stats collection |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3595 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3596 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3597 sprintf(verbose_str, "GC pause "); |
4710 | 3598 if (g1_policy()->gcs_are_young()) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3599 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3600 } else { |
4710 | 3601 strcat(verbose_str, "(mixed)"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3602 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3603 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3604 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3605 // 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
|
3606 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3607 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3608 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3609 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3610 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3611 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3612 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3613 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3614 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3615 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3616 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3617 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3618 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3619 |
2361 | 3620 // If the secondary_free_list is not empty, append it to the |
3621 // free_list. No need to wait for the cleanup operation to finish; | |
3622 // the region allocation code will check the secondary_free_list | |
3623 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3624 // set, skip this step so that the region allocation code has to | |
3625 // get entries from the secondary_free_list. | |
2152 | 3626 if (!G1StressConcRegionFreeing) { |
2361 | 3627 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3628 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3629 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3630 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3631 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3632 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3633 // 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
|
3634 // 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
|
3635 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3636 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3637 { // 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
|
3638 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3639 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3640 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3641 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
|
3642 increment_gc_time_stamp(); |
342 | 3643 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3644 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3645 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
|
3646 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3647 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3648 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3649 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3650 /* option */ VerifyOption_G1UsePrevMarking); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3651 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3652 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3653 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3654 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 // reference processing currently works in G1. |
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 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 |
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 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 // 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
|
3671 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3672 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3673 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3674 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3677 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3683 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3684 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 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
|
3688 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3689 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3692 |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3693 double scan_wait_start = os::elapsedTime(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3694 // We have to wait until the CM threads finish scanning the |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3695 // root regions as it's the only way to ensure that all the |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3696 // objects on them have been correctly scanned before we start |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3697 // moving them during the GC. |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3698 bool waited = _cm->root_regions()->wait_until_scan_finished(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3699 if (waited) { |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3700 double scan_wait_end = os::elapsedTime(); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3701 double wait_time_ms = (scan_wait_end - scan_wait_start) * 1000.0; |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3702 g1_policy()->record_root_region_scan_wait_time(wait_time_ms); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3703 } |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3704 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3705 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3706 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3707 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3708 #endif // YOUNG_LIST_VERBOSE |
342 | 3709 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3713 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3715 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3716 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3717 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3718 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
|
3719 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3720 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3721 g1_policy()->finalize_cset(target_pause_time_ms); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3722 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3723 _cm->note_start_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3724 // 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
|
3725 // we have not filtered them yet (we'll do so during the |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3726 // GC). We also call this after finalize_cset() to |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3727 // ensure that the CSet has been finalized. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3728 _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
|
3729 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3730 false /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3731 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3732 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3744 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3746 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3747 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3748 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3749 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3752 #endif // ASSERT |
1707 | 3753 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3762 // 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
|
3763 // (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
|
3764 // 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
|
3765 // 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
|
3766 // we checked. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3767 _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
|
3768 false /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3769 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3770 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3771 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3775 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3776 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3783 clear_cset_fast_test(); |
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 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3786 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3788 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3789 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 "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
|
3793 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3794 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3795 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3796 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3797 #endif // YOUNG_LIST_VERBOSE |
342 | 3798 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3799 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3800 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 _young_list->last_survivor_region()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 _young_list->reset_auxilary_lists(); |
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 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3808 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3810 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3811 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3812 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 if (g1_policy()->during_initial_mark_pause()) { |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3814 // We have to do this before we notify the CM threads that |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3815 // they can start working to make sure that all the |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3816 // appropriate initialization is done on the CM object. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3817 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 set_marking_started(); |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3819 // 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
|
3820 // 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
|
3821 // the current thread has completed its logging output. |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3822 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3823 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3824 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3825 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3826 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3828 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 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
|
3830 #endif // YOUNG_LIST_VERBOSE |
342 | 3831 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 init_mutator_alloc_region(); |
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 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3837 size_t bytes_before = capacity(); |
4785 | 3838 // No need for an ergo verbose message here, |
3839 // expansion_amount() does this when it returns a value > 0. | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3846 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3847 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3848 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3849 // 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
|
3850 // 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
|
3851 _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
|
3852 true /* verify_enqueued_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3853 true /* verify_thread_buffers */, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3854 true /* verify_fingers */); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3855 _cm->note_end_of_gc(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3856 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3857 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3858 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3859 g1_policy()->record_pause_time_ms(pause_time_ms); |
4711 | 3860 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
3861 workers()->active_workers() : 1); | |
3862 g1_policy()->record_collection_pause_end(active_workers); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3863 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3864 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3865 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3866 // 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
|
3867 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3868 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3869 // 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
|
3870 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3871 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3872 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3873 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3874 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3875 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3876 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3877 // 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
|
3878 // 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
|
3879 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3880 // 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
|
3881 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3882 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3883 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3884 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3885 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3886 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3887 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3888 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3889 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3890 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3891 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3892 prepare_for_verify(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3893 Universe::verify(/* allow dirty */ true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3894 /* silent */ false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3895 /* option */ VerifyOption_G1UsePrevMarking); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3896 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3897 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3898 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3899 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3900 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3901 // 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
|
3902 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3903 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3904 // 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
|
3905 // 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
|
3906 // 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
|
3907 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3908 _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
|
3909 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3910 // 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
|
3911 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3912 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3913 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3914 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3915 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3916 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3917 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3918 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3919 #endif |
342 | 3920 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3921 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3922 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3923 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3924 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3925 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
|
3926 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3927 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3928 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3929 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3930 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3931 // 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
|
3932 // 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
|
3933 // above will complete the logging output of PrintGCDetails. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3934 // |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3935 // 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
|
3936 // 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
|
3937 // 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
|
3938 // logging output either. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3939 |
3766 | 3940 _hrs.verify_optional(); |
2152 | 3941 verify_region_sets_optional(); |
3942 | |
1709 | 3943 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3944 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3945 | |
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3946 print_heap_after_gc(); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3947 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3948 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3949 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3950 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3951 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3952 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3953 } |
1973 | 3954 |
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3955 // 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
|
3956 // 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
|
3957 // that came from the pause. |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3958 |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3959 if (should_start_conc_mark) { |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3960 // CAUTION: after the doConcurrentMark() call below, |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3961 // the concurrent marking thread(s) could be running |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3962 // concurrently with us. Make sure that anything after |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3963 // 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
|
3964 // 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
|
3965 // 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
|
3966 // ConcurrentGCThread::safepoint_desynchronize(). |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3967 doConcurrentMark(); |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3968 } |
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3969 |
1973 | 3970 return true; |
342 | 3971 } |
3972 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3973 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3974 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3975 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3976 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3977 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3978 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3979 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3980 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3981 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3982 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3983 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3984 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3985 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3986 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3987 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3988 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3989 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3990 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3991 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3992 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3993 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3994 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3995 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3996 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3997 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3998 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3999 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4000 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4001 void G1CollectedHeap::init_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4002 assert_at_safepoint(true /* should_be_vm_thread */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4003 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4004 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4005 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4006 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4007 _retained_old_gc_alloc_region = NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4008 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4009 // We will discard the current GC alloc region if: |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4010 // a) it's in the collection set (it can happen!), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4011 // b) it's already full (no point in using it), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4012 // c) it's empty (this means that it was emptied during |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4013 // a cleanup and it should be on the free list now), or |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4014 // d) it's humongous (this means that it was emptied |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4015 // during a cleanup and was added to the free list, but |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4016 // has been subseqently used to allocate a humongous |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4017 // object that may be less than the region size). |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4018 if (retained_region != NULL && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4019 !retained_region->in_collection_set() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4020 !(retained_region->top() == retained_region->end()) && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4021 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4022 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4023 retained_region->set_saved_mark(); |
4072 | 4024 // The retained region was added to the old region set when it was |
4025 // retired. We have to remove it now, since we don't allow regions | |
4026 // we allocate to in the region sets. We'll re-add it later, when | |
4027 // it's retired again. | |
4028 _old_set.remove(retained_region); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4029 bool during_im = g1_policy()->during_initial_mark_pause(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4030 retained_region->note_start_of_copying(during_im); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4031 _old_gc_alloc_region.set(retained_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4032 _hr_printer.reuse(retained_region); |
342 | 4033 } |
4034 } | |
4035 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4036 void G1CollectedHeap::release_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4037 _survivor_gc_alloc_region.release(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4038 // If we have an old GC alloc region to release, we'll save it in |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4039 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4040 // _retained_old_gc_alloc_region will become NULL. This is what we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4041 // want either way so no reason to check explicitly for either |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4042 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4043 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 4044 } |
4045 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4046 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4047 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4048 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4049 _retained_old_gc_alloc_region = NULL; |
342 | 4050 } |
4051 | |
4052 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
4053 _drain_in_progress = false; | |
4054 set_evac_failure_closure(cl); | |
4055 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4056 } | |
4057 | |
4058 void G1CollectedHeap::finalize_for_evac_failure() { | |
4059 assert(_evac_failure_scan_stack != NULL && | |
4060 _evac_failure_scan_stack->length() == 0, | |
4061 "Postcondition"); | |
4062 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 4063 delete _evac_failure_scan_stack; |
342 | 4064 _evac_failure_scan_stack = NULL; |
4065 } | |
4066 | |
4067 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
|
4068 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
|
4069 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4070 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4071 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4072 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4073 if (G1CollectedHeap::use_parallel_gc_threads()) { |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4074 set_par_threads(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4075 workers()->run_task(&rsfp_task); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4076 set_par_threads(0); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4077 } else { |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4078 rsfp_task.work(0); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4079 } |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4080 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4081 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
|
4082 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4083 // 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
|
4084 reset_cset_heap_region_claim_values(); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4085 |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
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|
4086 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
342 | 4087 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
4088 | |
4089 // Now restore saved marks, if any. | |
4090 if (_objs_with_preserved_marks != NULL) { | |
4091 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4092 guarantee(_objs_with_preserved_marks->length() == | |
4093 _preserved_marks_of_objs->length(), "Both or none."); | |
4094 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4095 oop obj = _objs_with_preserved_marks->at(i); | |
4096 markOop m = _preserved_marks_of_objs->at(i); | |
4097 obj->set_mark(m); | |
4098 } | |
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4099 |
342 | 4100 // Delete the preserved marks growable arrays (allocated on the C heap). |
4101 delete _objs_with_preserved_marks; | |
4102 delete _preserved_marks_of_objs; | |
4103 _objs_with_preserved_marks = NULL; | |
4104 _preserved_marks_of_objs = NULL; | |
4105 } | |
4106 } | |
4107 | |
4108 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4109 _evac_failure_scan_stack->push(obj); | |
4110 } | |
4111 | |
4112 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4113 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4114 | |
4115 while (_evac_failure_scan_stack->length() > 0) { | |
4116 oop obj = _evac_failure_scan_stack->pop(); | |
4117 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4118 obj->oop_iterate_backwards(_evac_failure_closure); | |
4119 } | |
4120 } | |
4121 | |
4122 oop | |
4123 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
4787
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4124 oop old) { |
3323
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4125 assert(obj_in_cs(old), |
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4126 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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|
4127 (HeapWord*) old)); |
342 | 4128 markOop m = old->mark(); |
4129 oop forward_ptr = old->forward_to_atomic(old); | |
4130 if (forward_ptr == NULL) { | |
4131 // Forward-to-self succeeded. | |
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4132 |
342 | 4133 if (_evac_failure_closure != cl) { |
4134 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4135 assert(!_drain_in_progress, | |
4136 "Should only be true while someone holds the lock."); | |
4137 // Set the global evac-failure closure to the current thread's. | |
4138 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4139 set_evac_failure_closure(cl); | |
4140 // Now do the common part. | |
4141 handle_evacuation_failure_common(old, m); | |
4142 // Reset to NULL. | |
4143 set_evac_failure_closure(NULL); | |
4144 } else { | |
4145 // The lock is already held, and this is recursive. | |
4146 assert(_drain_in_progress, "This should only be the recursive case."); | |
4147 handle_evacuation_failure_common(old, m); | |
4148 } | |
4149 return old; | |
4150 } else { | |
3323
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4151 // Forward-to-self failed. Either someone else managed to allocate |
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4152 // space for this object (old != forward_ptr) or they beat us in |
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4153 // self-forwarding it (old == forward_ptr). |
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4154 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
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4155 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
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4156 "should not be in the CSet", |
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|
4157 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4158 return forward_ptr; |
4159 } | |
4160 } | |
4161 | |
4162 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4163 set_evacuation_failed(true); | |
4164 | |
4165 preserve_mark_if_necessary(old, m); | |
4166 | |
4167 HeapRegion* r = heap_region_containing(old); | |
4168 if (!r->evacuation_failed()) { | |
4169 r->set_evacuation_failed(true); | |
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4170 _hr_printer.evac_failure(r); |
342 | 4171 } |
4172 | |
4173 push_on_evac_failure_scan_stack(old); | |
4174 | |
4175 if (!_drain_in_progress) { | |
4176 // prevent recursion in copy_to_survivor_space() | |
4177 _drain_in_progress = true; | |
4178 drain_evac_failure_scan_stack(); | |
4179 _drain_in_progress = false; | |
4180 } | |
4181 } | |
4182 | |
4183 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
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4184 assert(evacuation_failed(), "Oversaving!"); |
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4185 // We want to call the "for_promotion_failure" version only in the |
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4186 // case of a promotion failure. |
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4187 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4188 if (_objs_with_preserved_marks == NULL) { |
4189 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4190 _objs_with_preserved_marks = | |
4191 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4192 _preserved_marks_of_objs = | |
4193 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4194 } | |
4195 _objs_with_preserved_marks->push(obj); | |
4196 _preserved_marks_of_objs->push(m); | |
4197 } | |
4198 } | |
4199 | |
4200 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4201 size_t word_size) { | |
3830
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4202 if (purpose == GCAllocForSurvived) { |
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4203 HeapWord* result = survivor_attempt_allocation(word_size); |
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4204 if (result != NULL) { |
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4205 return result; |
342 | 4206 } else { |
3830
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4207 // Let's try to allocate in the old gen in case we can fit the |
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|
4208 // object there. |
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4209 return old_attempt_allocation(word_size); |
342 | 4210 } |
3830
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|
4211 } else { |
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4212 assert(purpose == GCAllocForTenured, "sanity"); |
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4213 HeapWord* result = old_attempt_allocation(word_size); |
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4214 if (result != NULL) { |
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4215 return result; |
342 | 4216 } else { |
3830
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4217 // Let's try to allocate in the survivors in case we can fit the |
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|
4218 // object there. |
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4219 return survivor_attempt_allocation(word_size); |
342 | 4220 } |
3830
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|
4221 } |
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|
4222 |
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|
4223 ShouldNotReachHere(); |
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4224 // Trying to keep some compilers happy. |
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4225 return NULL; |
342 | 4226 } |
4227 | |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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4228 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
4787
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4229 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
3886
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4230 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4834
diff
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4231 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
845
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4232 : _g1h(g1h), |
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4233 _refs(g1h->task_queue(queue_num)), |
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4234 _dcq(&g1h->dirty_card_queue_set()), |
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4235 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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4236 _g1_rem(g1h->g1_rem_set()), |
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4237 _hash_seed(17), _queue_num(queue_num), |
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4238 _term_attempts(0), |
1391
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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4239 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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4240 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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4241 _age_table(false), |
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4242 _strong_roots_time(0), _term_time(0), |
4787
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4243 _alloc_buffer_waste(0), _undo_waste(0) { |
845
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|
4244 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
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4245 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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4246 // non-young regions (where the age is -1) |
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4247 // We also add a few elements at the beginning and at the end in |
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|
4248 // an attempt to eliminate cache contention |
4090
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4249 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
845
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4250 size_t array_length = PADDING_ELEM_NUM + |
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4251 real_length + |
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4252 PADDING_ELEM_NUM; |
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4253 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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4254 if (_surviving_young_words_base == NULL) |
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4255 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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4256 "Not enough space for young surv histo."); |
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4257 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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4258 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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4259 |
1391
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4260 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4261 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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4262 |
845
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|
4263 _start = os::elapsedTime(); |
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|
4264 } |
342 | 4265 |
1709 | 4266 void |
4267 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4268 { | |
4269 st->print_raw_cr("GC Termination Stats"); | |
4270 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4271 " ------waste (KiB)------"); | |
4272 st->print_raw_cr("thr ms ms % ms % attempts" | |
4273 " total alloc undo"); | |
4274 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4275 " ------- ------- -------"); | |
4276 } | |
4277 | |
4278 void | |
4279 G1ParScanThreadState::print_termination_stats(int i, | |
4280 outputStream* const st) const | |
4281 { | |
4282 const double elapsed_ms = elapsed_time() * 1000.0; | |
4283 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4284 const double term_ms = term_time() * 1000.0; | |
4285 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4286 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4287 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4288 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4289 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4290 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4291 alloc_buffer_waste() * HeapWordSize / K, | |
4292 undo_waste() * HeapWordSize / K); | |
4293 } | |
4294 | |
1862
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|
4295 #ifdef ASSERT |
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|
4296 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4297 assert(ref != NULL, "invariant"); |
b14ec34b1e07
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|
4298 assert(UseCompressedOops, "sanity"); |
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|
4299 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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|
4300 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
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|
4301 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4302 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4303 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4304 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4305 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4306 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4307 assert(ref != NULL, "invariant"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4308 if (has_partial_array_mask(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4309 // Must be in the collection set--it's already been copied. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4310 oop p = clear_partial_array_mask(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4311 assert(_g1h->obj_in_cs(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4312 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4313 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4314 oop p = oopDesc::load_decode_heap_oop(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4315 assert(_g1h->is_in_g1_reserved(p), |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4316 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4317 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4318 return true; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4319 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4320 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4321 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
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|
4322 if (ref.is_narrow()) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4323 return verify_ref((narrowOop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4324 } else { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4325 return verify_ref((oop*) ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4326 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4327 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4328 #endif // ASSERT |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4329 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4330 void G1ParScanThreadState::trim_queue() { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4331 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4332 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4333 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4334 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4335 StarTask ref; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4336 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4337 // Drain the overflow stack first, so other threads can steal. |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4338 while (refs()->pop_overflow(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4339 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4340 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4341 |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4342 while (refs()->pop_local(ref)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4343 deal_with_reference(ref); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4344 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4345 } while (!refs()->is_empty()); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4346 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4347 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4348 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4349 G1ParScanThreadState* par_scan_state) : |
342 | 4350 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4351 _par_scan_state(par_scan_state), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4352 _worker_id(par_scan_state->queue_num()), |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4353 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
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|
4354 _mark_in_progress(_g1->mark_in_progress()) { } |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4355 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4356 void G1ParCopyHelper::mark_object(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4357 #ifdef ASSERT |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4358 HeapRegion* hr = _g1->heap_region_containing(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4359 assert(hr != NULL, "sanity"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4360 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4361 #endif // ASSERT |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4362 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4363 // We know that the object is not moving so it's safe to read its size. |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4364 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4365 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4366 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4367 void G1ParCopyHelper::mark_forwarded_object(oop from_obj, oop to_obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4368 #ifdef ASSERT |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4369 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4370 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4371 assert(from_obj != to_obj, "should not be self-forwarded"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4372 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4373 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4374 assert(from_hr != NULL, "sanity"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4375 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4376 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4377 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4378 assert(to_hr != NULL, "sanity"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4379 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4380 #endif // ASSERT |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4381 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4382 // The object might be in the process of being copied by another |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4383 // worker so we cannot trust that its to-space image is |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4384 // well-formed. So we have to read its size from its from-space |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4385 // image which we know should not be changing. |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4386 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4387 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4388 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4389 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { |
342 | 4390 size_t word_sz = old->size(); |
4391 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4392 // +1 to make the -1 indexes valid... | |
4393 int young_index = from_region->young_index_in_cset()+1; | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4394 assert( (from_region->is_young() && young_index > 0) || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4395 (!from_region->is_young() && young_index == 0), "invariant" ); |
342 | 4396 G1CollectorPolicy* g1p = _g1->g1_policy(); |
4397 markOop m = old->mark(); | |
545 | 4398 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4399 : m->age(); | |
4400 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4401 word_sz); |
4402 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4403 oop obj = oop(obj_ptr); | |
4404 | |
4405 if (obj_ptr == NULL) { | |
4406 // This will either forward-to-self, or detect that someone else has | |
4407 // installed a forwarding pointer. | |
4408 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4409 return _g1->handle_evacuation_failure_par(cl, old); |
342 | 4410 } |
4411 | |
526 | 4412 // We're going to allocate linearly, so might as well prefetch ahead. |
4413 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4414 | |
342 | 4415 oop forward_ptr = old->forward_to_atomic(obj); |
4416 if (forward_ptr == NULL) { | |
4417 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4418 if (g1p->track_object_age(alloc_purpose)) { |
4419 // We could simply do obj->incr_age(). However, this causes a | |
4420 // performance issue. obj->incr_age() will first check whether | |
4421 // the object has a displaced mark by checking its mark word; | |
4422 // getting the mark word from the new location of the object | |
4423 // stalls. So, given that we already have the mark word and we | |
4424 // are about to install it anyway, it's better to increase the | |
4425 // age on the mark word, when the object does not have a | |
4426 // displaced mark word. We're not expecting many objects to have | |
4427 // a displaced marked word, so that case is not optimized | |
4428 // further (it could be...) and we simply call obj->incr_age(). | |
4429 | |
4430 if (m->has_displaced_mark_helper()) { | |
4431 // in this case, we have to install the mark word first, | |
4432 // otherwise obj looks to be forwarded (the old mark word, | |
4433 // which contains the forward pointer, was copied) | |
4434 obj->set_mark(m); | |
4435 obj->incr_age(); | |
4436 } else { | |
4437 m = m->incr_age(); | |
545 | 4438 obj->set_mark(m); |
526 | 4439 } |
545 | 4440 _par_scan_state->age_table()->add(obj, word_sz); |
4441 } else { | |
4442 obj->set_mark(m); | |
526 | 4443 } |
4444 | |
342 | 4445 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
4446 surv_young_words[young_index] += word_sz; | |
4447 | |
4448 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
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4783
diff
changeset
|
4449 // We keep track of the next start index in the length field of |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4450 // the to-space object. The actual length can be found in the |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4451 // length field of the from-space object. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4452 arrayOop(obj)->set_length(0); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4453 oop* old_p = set_partial_array_mask(old); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4454 _par_scan_state->push_on_queue(old_p); |
342 | 4455 } else { |
526 | 4456 // No point in using the slower heap_region_containing() method, |
4457 // given that we know obj is in the heap. | |
4458 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4459 obj->oop_iterate_backwards(_scanner); |
4460 } | |
4461 } else { | |
4462 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4463 obj = forward_ptr; | |
4464 } | |
4465 return obj; | |
4466 } | |
4467 | |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
johnc
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3869
diff
changeset
|
4468 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4469 template <class T> |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4470 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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838
diff
changeset
|
4471 ::do_oop_work(T* p) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4472 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4473 assert(barrier != G1BarrierRS || obj != NULL, |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4474 "Precondition: G1BarrierRS implies obj is non-NULL"); |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3869
diff
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|
4475 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4476 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
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diff
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|
4477 |
526 | 4478 // here the null check is implicit in the cset_fast_test() test |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4479 if (_g1->in_cset_fast_test(obj)) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4480 oop forwardee; |
526 | 4481 if (obj->is_forwarded()) { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4482 forwardee = obj->forwardee(); |
526 | 4483 } else { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4484 forwardee = copy_to_survivor_space(obj); |
342 | 4485 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4486 assert(forwardee != NULL, "forwardee should not be NULL"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
4487 oopDesc::encode_store_heap_oop(p, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4488 if (do_mark_object && forwardee != obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4489 // If the object is self-forwarded we don't need to explicitly |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
4490 // mark it, the evacuation failure protocol will do so. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4491 mark_forwarded_object(obj, forwardee); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4492 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
4493 |
526 | 4494 // When scanning the RS, we only care about objs in CS. |
4495 if (barrier == G1BarrierRS) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4496 _par_scan_state->update_rs(_from, p, _worker_id); |
342 | 4497 } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4498 } else { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
4499 // The object is not in collection set. If we're a root scanning |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4500 // closure during an initial mark pause (i.e. do_mark_object will |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4501 // be true) then attempt to mark the object. |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4502 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4503 mark_object(obj); |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
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diff
changeset
|
4504 } |
526 | 4505 } |
4506 | |
4507 if (barrier == G1BarrierEvac && obj != NULL) { | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
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diff
changeset
|
4508 _par_scan_state->update_rs(_from, p, _worker_id); |
526 | 4509 } |
4510 | |
4511 if (do_gen_barrier && obj != NULL) { | |
4512 par_do_barrier(p); | |
4513 } | |
4514 } | |
4515 | |
1261
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6923991: G1: improve scalability of RSet scanning
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diff
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|
4516 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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|
4517 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4518 |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4519 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4520 assert(has_partial_array_mask(p), "invariant"); |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4521 oop from_obj = clear_partial_array_mask(p); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4522 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4523 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4524 assert(from_obj->is_objArray(), "must be obj array"); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4525 objArrayOop from_obj_array = objArrayOop(from_obj); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4526 // The from-space object contains the real length. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4527 int length = from_obj_array->length(); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4528 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4529 assert(from_obj->is_forwarded(), "must be forwarded"); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
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diff
changeset
|
4530 oop to_obj = from_obj->forwardee(); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4531 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4532 objArrayOop to_obj_array = objArrayOop(to_obj); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4533 // We keep track of the next start index in the length field of the |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4534 // to-space object. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4535 int next_index = to_obj_array->length(); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4536 assert(0 <= next_index && next_index < length, |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4537 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4538 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4539 int start = next_index; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4540 int end = length; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4541 int remainder = end - start; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4542 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
342 | 4543 if (remainder > 2 * ParGCArrayScanChunk) { |
4544 end = start + ParGCArrayScanChunk; | |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4545 to_obj_array->set_length(end); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4546 // Push the remainder before we process the range in case another |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4547 // worker has run out of things to do and can steal it. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4548 oop* from_obj_p = set_partial_array_mask(from_obj); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4549 _par_scan_state->push_on_queue(from_obj_p); |
342 | 4550 } else { |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4551 assert(length == end, "sanity"); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4552 // We'll process the final range for this object. Restore the length |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4553 // so that the heap remains parsable in case of evacuation failure. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4554 to_obj_array->set_length(end); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4555 } |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4556 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4557 // Process indexes [start,end). It will also process the header |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4558 // along with the first chunk (i.e., the chunk with start == 0). |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4559 // Note that at this point the length field of to_obj_array is not |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4560 // correct given that we are using it to keep track of the next |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4561 // start index. oop_iterate_range() (thankfully!) ignores the length |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4562 // field and only relies on the start / end parameters. It does |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4563 // however return the size of the object which will be incorrect. So |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4564 // we have to ignore it even if we wanted to use it. |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4565 to_obj_array->oop_iterate_range(&_scanner, start, end); |
342 | 4566 } |
4567 | |
4568 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4569 protected: | |
4570 G1CollectedHeap* _g1h; | |
4571 G1ParScanThreadState* _par_scan_state; | |
4572 RefToScanQueueSet* _queues; | |
4573 ParallelTaskTerminator* _terminator; | |
4574 | |
4575 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4576 RefToScanQueueSet* queues() { return _queues; } | |
4577 ParallelTaskTerminator* terminator() { return _terminator; } | |
4578 | |
4579 public: | |
4580 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4581 G1ParScanThreadState* par_scan_state, | |
4582 RefToScanQueueSet* queues, | |
4583 ParallelTaskTerminator* terminator) | |
4584 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4585 _queues(queues), _terminator(terminator) {} | |
4586 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4587 void do_void(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4588 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4589 private: |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4590 inline bool offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4591 }; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4592 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4593 bool G1ParEvacuateFollowersClosure::offer_termination() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4594 G1ParScanThreadState* const pss = par_scan_state(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4595 pss->start_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4596 const bool res = terminator()->offer_termination(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4597 pss->end_term_time(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4598 return res; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4599 } |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4600 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4601 void G1ParEvacuateFollowersClosure::do_void() { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4602 StarTask stolen_task; |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4603 G1ParScanThreadState* const pss = par_scan_state(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4604 pss->trim_queue(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4605 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4606 do { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4607 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4608 assert(pss->verify_task(stolen_task), "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4609 if (stolen_task.is_narrow()) { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4610 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4611 } else { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4612 pss->deal_with_reference((oop*) stolen_task); |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4613 } |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4614 |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4615 // 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
tonyp
parents:
1862
diff
changeset
|
4616 // available new entries on the queues. So we have to make sure |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4617 // we drain the queues as necessary. |
342 | 4618 pss->trim_queue(); |
4619 } | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4620 } while (!offer_termination()); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4621 |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4622 pss->retire_alloc_buffers(); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4623 } |
342 | 4624 |
4625 class G1ParTask : public AbstractGangTask { | |
4626 protected: | |
4627 G1CollectedHeap* _g1h; | |
4628 RefToScanQueueSet *_queues; | |
4629 ParallelTaskTerminator _terminator; | |
4728
441e946dc1af
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4630 uint _n_workers; |
342 | 4631 |
4632 Mutex _stats_lock; | |
4633 Mutex* stats_lock() { return &_stats_lock; } | |
4634 | |
4635 size_t getNCards() { | |
4636 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4637 / G1BlockOffsetSharedArray::N_bytes; | |
4638 } | |
4639 | |
4640 public: | |
4095
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|
4641 G1ParTask(G1CollectedHeap* g1h, |
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|
4642 RefToScanQueueSet *task_queues) |
342 | 4643 : AbstractGangTask("G1 collection"), |
4644 _g1h(g1h), | |
4645 _queues(task_queues), | |
4095
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|
4646 _terminator(0, _queues), |
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4647 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 4648 {} |
4649 | |
4650 RefToScanQueueSet* queues() { return _queues; } | |
4651 | |
4652 RefToScanQueue *work_queue(int i) { | |
4653 return queues()->queue(i); | |
4654 } | |
4655 | |
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4656 ParallelTaskTerminator* terminator() { return &_terminator; } |
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|
4657 |
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4658 virtual void set_for_termination(int active_workers) { |
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4659 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
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4660 // in the young space (_par_seq_tasks) in the G1 heap |
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4661 // for SequentialSubTasksDone. |
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4662 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
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4663 // both of which need setting by set_n_termination(). |
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4664 _g1h->SharedHeap::set_n_termination(active_workers); |
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4665 _g1h->set_n_termination(active_workers); |
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4666 terminator()->reset_for_reuse(active_workers); |
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4667 _n_workers = active_workers; |
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|
4668 } |
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|
4669 |
4728
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|
4670 void work(uint worker_id) { |
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|
4671 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 4672 |
4673 double start_time_ms = os::elapsedTime() * 1000.0; | |
4728
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4674 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 4675 |
342 | 4676 ResourceMark rm; |
4677 HandleMark hm; | |
4678 | |
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4679 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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|
4680 |
4728
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|
4681 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
4682 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
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4683 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
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4684 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
342 | 4685 |
4686 pss.set_evac_closure(&scan_evac_cl); | |
4687 pss.set_evac_failure_closure(&evac_failure_cl); | |
4688 pss.set_partial_scan_closure(&partial_scan_cl); | |
4689 | |
3979
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4690 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
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4691 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
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|
4692 |
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|
4693 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
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4694 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
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|
4695 |
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|
4696 OopClosure* scan_root_cl = &only_scan_root_cl; |
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|
4697 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
342 | 4698 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
4699 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
3979
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|
4700 // We also need to mark copied objects. |
342 | 4701 scan_root_cl = &scan_mark_root_cl; |
4702 scan_perm_cl = &scan_mark_perm_cl; | |
4703 } | |
4704 | |
3983
811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
johnc
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3982
diff
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|
4705 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
3979
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|
4706 |
342 | 4707 pss.start_strong_roots(); |
4708 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4709 SharedHeap::SO_AllClasses, | |
4710 scan_root_cl, | |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
4711 &push_heap_rs_cl, |
342 | 4712 scan_perm_cl, |
4728
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|
4713 worker_id); |
342 | 4714 pss.end_strong_roots(); |
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|
4715 |
342 | 4716 { |
4717 double start = os::elapsedTime(); | |
4718 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4719 evac.do_void(); | |
4720 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4721 double term_ms = pss.term_time()*1000.0; | |
4728
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4722 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
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4723 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
342 | 4724 } |
1282 | 4725 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4726 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4727 | |
4728 // Clean up any par-expanded rem sets. | |
4729 HeapRegionRemSet::par_cleanup(); | |
4730 | |
4731 if (ParallelGCVerbose) { | |
1709 | 4732 MutexLocker x(stats_lock()); |
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|
4733 pss.print_termination_stats(worker_id); |
342 | 4734 } |
4735 | |
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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|
4736 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4737 double end_time_ms = os::elapsedTime() * 1000.0; |
4728
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|
4738 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 4739 } |
4740 }; | |
4741 | |
4742 // *** Common G1 Evacuation Stuff | |
4743 | |
1833
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1755
diff
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|
4744 // This method is run in a GC worker. |
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|
4745 |
342 | 4746 void |
4747 G1CollectedHeap:: | |
4748 g1_process_strong_roots(bool collecting_perm_gen, | |
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
4749 ScanningOption so, |
342 | 4750 OopClosure* scan_non_heap_roots, |
4751 OopsInHeapRegionClosure* scan_rs, | |
4752 OopsInGenClosure* scan_perm, | |
4753 int worker_i) { | |
3979
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|
4754 |
342 | 4755 // First scan the strong roots, including the perm gen. |
4756 double ext_roots_start = os::elapsedTime(); | |
4757 double closure_app_time_sec = 0.0; | |
4758 | |
4759 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4760 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4761 buf_scan_perm.set_generation(perm_gen()); | |
4762 | |
989
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|
4763 // Walk the code cache w/o buffering, because StarTask cannot handle |
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|
4764 // unaligned oop locations. |
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|
4765 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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|
4766 |
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|
4767 process_strong_roots(false, // no scoping; this is parallel code |
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|
4768 collecting_perm_gen, so, |
342 | 4769 &buf_scan_non_heap_roots, |
989
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|
4770 &eager_scan_code_roots, |
342 | 4771 &buf_scan_perm); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
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|
4772 |
3979
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|
4773 // Now the CM ref_processor roots. |
3823
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|
4774 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
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|
4775 // We need to treat the discovered reference lists of the |
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diff
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|
4776 // concurrent mark ref processor as roots and keep entries |
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|
4777 // (which are added by the marking threads) on them live |
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|
4778 // until they can be processed at the end of marking. |
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|
4779 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
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|
4780 } |
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|
4781 |
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|
4782 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4783 buf_scan_non_heap_roots.done(); |
4784 buf_scan_perm.done(); | |
3823
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|
4785 |
342 | 4786 double ext_roots_end = os::elapsedTime(); |
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|
4787 |
342 | 4788 g1_policy()->reset_obj_copy_time(worker_i); |
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|
4789 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
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|
4790 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4791 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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|
4792 |
342 | 4793 double ext_root_time_ms = |
4794 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
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|
4795 |
342 | 4796 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4797 | |
4787
2ace1c4ee8da
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diff
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|
4798 // During conc marking we have to filter the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4799 // to make sure we remove any oops into the CSet (which will show up |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
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|
4800 // as implicitly live). |
2ace1c4ee8da
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diff
changeset
|
4801 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
2ace1c4ee8da
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diff
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|
4802 if (mark_in_progress()) { |
2ace1c4ee8da
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diff
changeset
|
4803 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
2ace1c4ee8da
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4785
diff
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|
4804 } |
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|
4805 } |
2ace1c4ee8da
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diff
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|
4806 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
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diff
changeset
|
4807 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
342 | 4808 |
4809 // Now scan the complement of the collection set. | |
4810 if (scan_rs != NULL) { | |
4811 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4812 } | |
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|
4813 |
342 | 4814 _process_strong_tasks->all_tasks_completed(); |
4815 } | |
4816 | |
4817 void | |
4818 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4819 OopClosure* non_root_closure) { | |
989
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|
4820 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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|
4821 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4822 } |
4823 | |
3979
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|
4824 // Weak Reference Processing support |
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diff
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|
4825 |
4dfb2df418f2
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|
4826 // An always "is_alive" closure that is used to preserve referents. |
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4827 // If the object is non-null then it's alive. Used in the preservation |
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changeset
|
4828 // of referent objects that are pointed to by reference objects |
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parents:
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diff
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|
4829 // discovered by the CM ref processor. |
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|
4830 class G1AlwaysAliveClosure: public BoolObjectClosure { |
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|
4831 G1CollectedHeap* _g1; |
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diff
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|
4832 public: |
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diff
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|
4833 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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diff
changeset
|
4834 void do_object(oop p) { assert(false, "Do not call."); } |
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|
4835 bool do_object_b(oop p) { |
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diff
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|
4836 if (p != NULL) { |
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parents:
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diff
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|
4837 return true; |
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parents:
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diff
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|
4838 } |
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diff
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|
4839 return false; |
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diff
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|
4840 } |
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diff
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|
4841 }; |
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diff
changeset
|
4842 |
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diff
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|
4843 bool G1STWIsAliveClosure::do_object_b(oop p) { |
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|
4844 // An object is reachable if it is outside the collection set, |
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|
4845 // or is inside and copied. |
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|
4846 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
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|
4847 } |
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|
4848 |
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diff
changeset
|
4849 // Non Copying Keep Alive closure |
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|
4850 class G1KeepAliveClosure: public OopClosure { |
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|
4851 G1CollectedHeap* _g1; |
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|
4852 public: |
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|
4853 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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|
4854 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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|
4855 void do_oop( oop* p) { |
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|
4856 oop obj = *p; |
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|
4857 |
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|
4858 if (_g1->obj_in_cs(obj)) { |
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|
4859 assert( obj->is_forwarded(), "invariant" ); |
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|
4860 *p = obj->forwardee(); |
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|
4861 } |
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diff
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|
4862 } |
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|
4863 }; |
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|
4864 |
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|
4865 // Copying Keep Alive closure - can be called from both |
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parents:
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diff
changeset
|
4866 // serial and parallel code as long as different worker |
4dfb2df418f2
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parents:
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diff
changeset
|
4867 // threads utilize different G1ParScanThreadState instances |
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parents:
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diff
changeset
|
4868 // and different queues. |
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diff
changeset
|
4869 |
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|
4870 class G1CopyingKeepAliveClosure: public OopClosure { |
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|
4871 G1CollectedHeap* _g1h; |
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|
4872 OopClosure* _copy_non_heap_obj_cl; |
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|
4873 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
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|
4874 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
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|
4875 |
4dfb2df418f2
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parents:
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diff
changeset
|
4876 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
4877 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
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|
4878 OopClosure* non_heap_obj_cl, |
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parents:
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changeset
|
4879 OopsInHeapRegionClosure* perm_obj_cl, |
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parents:
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diff
changeset
|
4880 G1ParScanThreadState* pss): |
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parents:
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diff
changeset
|
4881 _g1h(g1h), |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4882 _copy_non_heap_obj_cl(non_heap_obj_cl), |
4dfb2df418f2
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parents:
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diff
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|
4883 _copy_perm_obj_cl(perm_obj_cl), |
4dfb2df418f2
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parents:
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diff
changeset
|
4884 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4885 {} |
4dfb2df418f2
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parents:
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diff
changeset
|
4886 |
4dfb2df418f2
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parents:
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diff
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|
4887 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
4dfb2df418f2
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parents:
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diff
changeset
|
4888 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
|
4889 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4890 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
|
4891 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
|
4892 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4893 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
|
4894 // If the referent object has been forwarded (either copied |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4895 // to a new location or to itself in the event of an |
4dfb2df418f2
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parents:
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diff
changeset
|
4896 // evacuation failure) then we need to update the reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4897 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4898 // heap, update the RSet for the referent. |
4dfb2df418f2
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parents:
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diff
changeset
|
4899 // |
4dfb2df418f2
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parents:
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diff
changeset
|
4900 // If the referent has not been forwarded then we have to keep |
4dfb2df418f2
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parents:
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diff
changeset
|
4901 // it alive by policy. Therefore we have copy the referent. |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
4902 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4903 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4904 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4905 // phase of reference processing) the object and it's followers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4906 // will be copied, the reference field set to point to the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4907 // new location, and the RSet updated. Otherwise we need to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4908 // use the the non-heap or perm closures directly to copy |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4909 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4910 // updating the RSet. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4911 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4912 if (_g1h->is_in_g1_reserved(p)) { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4913 _par_scan_state->push_on_queue(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4914 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4915 // The reference field is not in the G1 heap. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4916 if (_g1h->perm_gen()->is_in(p)) { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4917 _copy_perm_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4918 } else { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4919 _copy_non_heap_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4920 } |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
4921 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4922 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4923 } |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
4924 }; |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4925 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4926 // Serial drain queue closure. Called as the 'complete_gc' |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4927 // closure for each discovered list in some of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4928 // reference processing phases. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4929 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4930 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4931 protected: |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4932 G1CollectedHeap* _g1h; |
4dfb2df418f2
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3973
diff
changeset
|
4933 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
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parents:
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diff
changeset
|
4934 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4935 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4936 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4937 public: |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4938 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4939 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4940 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4941 { } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4942 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4943 void do_void() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4944 G1ParScanThreadState* const pss = par_scan_state(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4945 pss->trim_queue(); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4946 } |
4dfb2df418f2
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diff
changeset
|
4947 }; |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4948 |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4949 // Parallel Reference Processing closures |
4dfb2df418f2
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parents:
3973
diff
changeset
|
4950 |
4dfb2df418f2
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diff
changeset
|
4951 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
4dfb2df418f2
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3973
diff
changeset
|
4952 // processing during G1 evacuation pauses. |
4dfb2df418f2
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parents:
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diff
changeset
|
4953 |
4dfb2df418f2
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diff
changeset
|
4954 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
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parents:
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diff
changeset
|
4955 private: |
4dfb2df418f2
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diff
changeset
|
4956 G1CollectedHeap* _g1h; |
4dfb2df418f2
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diff
changeset
|
4957 RefToScanQueueSet* _queues; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
4958 FlexibleWorkGang* _workers; |
3979
4dfb2df418f2
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3973
diff
changeset
|
4959 int _active_workers; |
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|
4960 |
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|
4961 public: |
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|
4962 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
bca17e38de00
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|
4963 FlexibleWorkGang* workers, |
3979
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|
4964 RefToScanQueueSet *task_queues, |
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|
4965 int n_workers) : |
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|
4966 _g1h(g1h), |
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changeset
|
4967 _queues(task_queues), |
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changeset
|
4968 _workers(workers), |
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changeset
|
4969 _active_workers(n_workers) |
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|
4970 { |
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|
4971 assert(n_workers > 0, "shouldn't call this otherwise"); |
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|
4972 } |
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|
4973 |
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|
4974 // Executes the given task using concurrent marking worker threads. |
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changeset
|
4975 virtual void execute(ProcessTask& task); |
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|
4976 virtual void execute(EnqueueTask& task); |
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|
4977 }; |
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|
4978 |
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|
4979 // Gang task for possibly parallel reference processing |
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|
4980 |
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|
4981 class G1STWRefProcTaskProxy: public AbstractGangTask { |
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4982 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
4983 ProcessTask& _proc_task; |
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4984 G1CollectedHeap* _g1h; |
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|
4985 RefToScanQueueSet *_task_queues; |
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|
4986 ParallelTaskTerminator* _terminator; |
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|
4987 |
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|
4988 public: |
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|
4989 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
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|
4990 G1CollectedHeap* g1h, |
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4991 RefToScanQueueSet *task_queues, |
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|
4992 ParallelTaskTerminator* terminator) : |
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changeset
|
4993 AbstractGangTask("Process reference objects in parallel"), |
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|
4994 _proc_task(proc_task), |
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changeset
|
4995 _g1h(g1h), |
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|
4996 _task_queues(task_queues), |
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|
4997 _terminator(terminator) |
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|
4998 {} |
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|
4999 |
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|
5000 virtual void work(uint worker_id) { |
3979
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|
5001 // The reference processing task executed by a single worker. |
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|
5002 ResourceMark rm; |
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changeset
|
5003 HandleMark hm; |
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|
5004 |
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|
5005 G1STWIsAliveClosure is_alive(_g1h); |
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|
5006 |
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|
5007 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5008 |
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|
5009 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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|
5010 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5011 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
5012 |
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|
5013 pss.set_evac_closure(&scan_evac_cl); |
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|
5014 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5015 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5016 |
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|
5017 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5018 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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changeset
|
5019 |
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changeset
|
5020 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5021 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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changeset
|
5022 |
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changeset
|
5023 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
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changeset
|
5024 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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changeset
|
5025 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5026 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5027 // We also need to mark copied objects. |
4dfb2df418f2
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parents:
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diff
changeset
|
5028 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
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changeset
|
5029 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5030 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5031 |
4dfb2df418f2
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diff
changeset
|
5032 // Keep alive closure. |
4dfb2df418f2
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parents:
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diff
changeset
|
5033 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
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changeset
|
5034 |
4dfb2df418f2
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parents:
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diff
changeset
|
5035 // Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5036 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
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changeset
|
5037 |
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changeset
|
5038 // Call the reference processing task's work routine. |
4728
441e946dc1af
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jmasa
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changeset
|
5039 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
4dfb2df418f2
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parents:
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changeset
|
5040 |
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diff
changeset
|
5041 // Note we cannot assert that the refs array is empty here as not all |
4dfb2df418f2
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changeset
|
5042 // of the processing tasks (specifically phase2 - pp2_work) execute |
4dfb2df418f2
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changeset
|
5043 // the complete_gc closure (which ordinarily would drain the queue) so |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
5044 // the queue may not be empty. |
4dfb2df418f2
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parents:
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diff
changeset
|
5045 } |
4dfb2df418f2
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diff
changeset
|
5046 }; |
4dfb2df418f2
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diff
changeset
|
5047 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5048 // Driver routine for parallel reference processing. |
4dfb2df418f2
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parents:
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diff
changeset
|
5049 // Creates an instance of the ref processing gang |
4dfb2df418f2
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diff
changeset
|
5050 // task and has the worker threads execute it. |
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changeset
|
5051 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
4dfb2df418f2
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diff
changeset
|
5052 assert(_workers != NULL, "Need parallel worker threads."); |
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diff
changeset
|
5053 |
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diff
changeset
|
5054 ParallelTaskTerminator terminator(_active_workers, _queues); |
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changeset
|
5055 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
4dfb2df418f2
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changeset
|
5056 |
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diff
changeset
|
5057 _g1h->set_par_threads(_active_workers); |
4dfb2df418f2
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diff
changeset
|
5058 _workers->run_task(&proc_task_proxy); |
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changeset
|
5059 _g1h->set_par_threads(0); |
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diff
changeset
|
5060 } |
4dfb2df418f2
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diff
changeset
|
5061 |
4dfb2df418f2
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parents:
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diff
changeset
|
5062 // Gang task for parallel reference enqueueing. |
4dfb2df418f2
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parents:
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diff
changeset
|
5063 |
4dfb2df418f2
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parents:
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diff
changeset
|
5064 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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changeset
|
5065 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
4dfb2df418f2
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diff
changeset
|
5066 EnqueueTask& _enq_task; |
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diff
changeset
|
5067 |
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diff
changeset
|
5068 public: |
4dfb2df418f2
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diff
changeset
|
5069 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
4dfb2df418f2
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parents:
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diff
changeset
|
5070 AbstractGangTask("Enqueue reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5071 _enq_task(enq_task) |
4dfb2df418f2
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parents:
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diff
changeset
|
5072 { } |
4dfb2df418f2
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diff
changeset
|
5073 |
4728
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diff
changeset
|
5074 virtual void work(uint worker_id) { |
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diff
changeset
|
5075 _enq_task.work(worker_id); |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5076 } |
4dfb2df418f2
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diff
changeset
|
5077 }; |
4dfb2df418f2
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diff
changeset
|
5078 |
4dfb2df418f2
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parents:
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diff
changeset
|
5079 // Driver routine for parallel reference enqueing. |
4dfb2df418f2
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parents:
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diff
changeset
|
5080 // Creates an instance of the ref enqueueing gang |
4dfb2df418f2
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parents:
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diff
changeset
|
5081 // task and has the worker threads execute it. |
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parents:
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diff
changeset
|
5082 |
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diff
changeset
|
5083 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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parents:
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diff
changeset
|
5084 assert(_workers != NULL, "Need parallel worker threads."); |
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parents:
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diff
changeset
|
5085 |
4dfb2df418f2
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parents:
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diff
changeset
|
5086 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
4dfb2df418f2
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diff
changeset
|
5087 |
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diff
changeset
|
5088 _g1h->set_par_threads(_active_workers); |
4dfb2df418f2
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diff
changeset
|
5089 _workers->run_task(&enq_task_proxy); |
4dfb2df418f2
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diff
changeset
|
5090 _g1h->set_par_threads(0); |
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|
5091 } |
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|
5092 |
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|
5093 // End of weak reference support closures |
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|
5094 |
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|
5095 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5096 // that are in the collection set and are pointed to by reference |
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|
5097 // objects discovered by the CM ref processor. |
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|
5098 |
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|
5099 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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|
5100 protected: |
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|
5101 G1CollectedHeap* _g1h; |
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|
5102 RefToScanQueueSet *_queues; |
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|
5103 ParallelTaskTerminator _terminator; |
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|
5104 uint _n_workers; |
3979
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|
5105 |
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|
5106 public: |
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|
5107 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
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|
5108 AbstractGangTask("ParPreserveCMReferents"), |
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|
5109 _g1h(g1h), |
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|
5110 _queues(task_queues), |
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|
5111 _terminator(workers, _queues), |
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|
5112 _n_workers(workers) |
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|
5113 { } |
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|
5114 |
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5115 void work(uint worker_id) { |
3979
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|
5116 ResourceMark rm; |
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|
5117 HandleMark hm; |
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|
5118 |
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5119 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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5120 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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5121 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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5122 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
5123 |
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|
5124 pss.set_evac_closure(&scan_evac_cl); |
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|
5125 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5126 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5127 |
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|
5128 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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|
5129 |
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|
5130 |
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|
5131 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5132 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5133 |
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|
5134 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5135 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
5136 |
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|
5137 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5138 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5139 |
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|
5140 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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|
5141 // We also need to mark copied objects. |
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|
5142 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5143 copy_perm_cl = ©_mark_perm_cl; |
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|
5144 } |
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changeset
|
5145 |
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diff
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|
5146 // Is alive closure |
4dfb2df418f2
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diff
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|
5147 G1AlwaysAliveClosure always_alive(_g1h); |
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|
5148 |
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|
5149 // Copying keep alive closure. Applied to referent objects that need |
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|
5150 // to be copied. |
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|
5151 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5152 |
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|
5153 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
5154 |
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|
5155 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
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jmasa
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|
5156 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
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|
5157 |
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diff
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|
5158 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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|
5159 // So this must be true - but assert just in case someone decides to |
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diff
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|
5160 // change the worker ids. |
4728
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diff
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|
5161 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
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|
5162 assert(!rp->discovery_is_atomic(), "check this code"); |
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diff
changeset
|
5163 |
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diff
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|
5164 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
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jmasa
parents:
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|
5165 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5166 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
4dfb2df418f2
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|
5167 |
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diff
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|
5168 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
4dfb2df418f2
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diff
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|
5169 while (iter.has_next()) { |
4dfb2df418f2
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diff
changeset
|
5170 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
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diff
changeset
|
5171 // can see some null referent objects. |
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diff
changeset
|
5172 iter.load_ptrs(DEBUG_ONLY(true)); |
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|
5173 oop ref = iter.obj(); |
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diff
changeset
|
5174 |
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diff
changeset
|
5175 // This will filter nulls. |
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diff
changeset
|
5176 if (iter.is_referent_alive()) { |
4dfb2df418f2
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diff
changeset
|
5177 iter.make_referent_alive(); |
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diff
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|
5178 } |
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diff
changeset
|
5179 iter.move_to_next(); |
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diff
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|
5180 } |
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diff
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|
5181 } |
4dfb2df418f2
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diff
changeset
|
5182 |
4dfb2df418f2
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diff
changeset
|
5183 // Drain the queue - which may cause stealing |
4dfb2df418f2
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diff
changeset
|
5184 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
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|
5185 drain_queue.do_void(); |
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diff
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|
5186 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
4dfb2df418f2
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changeset
|
5187 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
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diff
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|
5188 } |
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diff
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|
5189 }; |
4dfb2df418f2
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diff
changeset
|
5190 |
4dfb2df418f2
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diff
changeset
|
5191 // Weak Reference processing during an evacuation pause (part 1). |
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diff
changeset
|
5192 void G1CollectedHeap::process_discovered_references() { |
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|
5193 double ref_proc_start = os::elapsedTime(); |
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|
5194 |
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|
5195 ReferenceProcessor* rp = _ref_processor_stw; |
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|
5196 assert(rp->discovery_enabled(), "should have been enabled"); |
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changeset
|
5197 |
4dfb2df418f2
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diff
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|
5198 // Any reference objects, in the collection set, that were 'discovered' |
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diff
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|
5199 // by the CM ref processor should have already been copied (either by |
4dfb2df418f2
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|
5200 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
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diff
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|
5201 // by following an RSet entry). |
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diff
changeset
|
5202 // |
4dfb2df418f2
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diff
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|
5203 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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|
5204 // reference objects point to may not have been copied: the STW ref |
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diff
changeset
|
5205 // processor would have seen that the reference object had already |
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diff
changeset
|
5206 // been 'discovered' and would have skipped discovering the reference, |
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|
5207 // but would not have treated the reference object as a regular oop. |
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|
5208 // As a reult the copy closure would not have been applied to the |
4dfb2df418f2
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changeset
|
5209 // referent object. |
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diff
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|
5210 // |
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|
5211 // We need to explicitly copy these referent objects - the references |
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|
5212 // will be processed at the end of remarking. |
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|
5213 // |
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|
5214 // We also need to do this copying before we process the reference |
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|
5215 // objects discovered by the STW ref processor in case one of these |
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|
5216 // referents points to another object which is also referenced by an |
4dfb2df418f2
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|
5217 // object discovered by the STW ref processor. |
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|
5218 |
4728
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|
5219 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
4095
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|
5220 workers()->active_workers() : 1); |
bca17e38de00
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|
5221 |
4711 | 5222 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
5223 active_workers == workers()->active_workers(), | |
5224 "Need to reset active_workers"); | |
5225 | |
4095
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|
5226 set_par_threads(active_workers); |
bca17e38de00
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|
5227 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
3979
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changeset
|
5228 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5229 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
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parents:
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changeset
|
5230 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5231 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
5232 keep_cm_referents.work(0); |
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diff
changeset
|
5233 } |
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parents:
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diff
changeset
|
5234 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5235 set_par_threads(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5236 |
4dfb2df418f2
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diff
changeset
|
5237 // Closure to test whether a referent is alive. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5238 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
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parents:
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diff
changeset
|
5239 |
4dfb2df418f2
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parents:
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diff
changeset
|
5240 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5241 // of JNI refs is serial and performed serially by the current thread |
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|
5242 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5243 // JNI refs. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5244 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5245 // Use only a single queue for this PSS. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5246 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
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diff
changeset
|
5247 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5248 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5249 // closures while we're actually processing the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5250 // reference objects. |
4dfb2df418f2
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diff
changeset
|
5251 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5252 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5253 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5254 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
5255 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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|
5256 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
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|
5257 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
5258 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5259 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
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diff
changeset
|
5260 |
4dfb2df418f2
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diff
changeset
|
5261 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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|
5262 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5263 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5264 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5265 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5266 |
4dfb2df418f2
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diff
changeset
|
5267 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
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diff
changeset
|
5268 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5269 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5270 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5271 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5272 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
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diff
changeset
|
5273 copy_perm_cl = ©_mark_perm_cl; |
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 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5276 // Keep alive closure. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5277 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
|
5278 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 // Serial Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 rp->process_discovered_references(&is_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 &keep_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 &drain_queue, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 NULL); |
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 processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5293 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5296 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5297 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
|
5298 } |
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 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5301 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5304 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
|
5305 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5308 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5310 // Weak Reference processing during an evacuation pause (part 2). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5312 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5313 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5314 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5315 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
|
5316 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5317 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5318 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5320 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5321 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5322 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5323 // Parallel reference enqueuing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5325 uint active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
4095
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jmasa
parents:
4090
diff
changeset
|
5326 assert(active_workers == workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
5327 "Need to reset active_workers"); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5328 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5329 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5331 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5332 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5333 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5334 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5335 rp->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5336 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5337 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5338 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5339 // 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
|
5340 // 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
|
5341 // and could signicantly increase the pause time. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5342 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5343 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5344 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5345 } |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5346 |
342 | 5347 void G1CollectedHeap::evacuate_collection_set() { |
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5348 _expand_heap_after_alloc_failure = true; |
342 | 5349 set_evacuation_failed(false); |
5350 | |
5351 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5352 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5353 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5354 | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5355 uint n_workers; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5356 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
5357 n_workers = |
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|
5358 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
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|
5359 workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
5360 Threads::number_of_non_daemon_threads()); |
bca17e38de00
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|
5361 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
5362 n_workers == workers()->total_workers(), |
bca17e38de00
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|
5363 "If not dynamic should be using all the workers"); |
4711 | 5364 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5365 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
5366 } else { |
bca17e38de00
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diff
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|
5367 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
5368 "Should be the original non-parallel value"); |
bca17e38de00
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|
5369 n_workers = 1; |
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|
5370 } |
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|
5371 |
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|
5372 G1ParTask g1_par_task(this, _task_queues); |
342 | 5373 |
5374 init_for_evac_failure(NULL); | |
5375 | |
5376 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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|
5377 |
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|
5378 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 5379 double start_par = os::elapsedTime(); |
3979
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|
5380 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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|
5381 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 5382 // The individual threads will set their evac-failure closures. |
989
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6863023: need non-perm oops in code cache for JSR 292
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|
5383 StrongRootsScope srs(this); |
1709 | 5384 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
4095
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|
5385 // These tasks use ShareHeap::_process_strong_tasks |
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|
5386 assert(UseDynamicNumberOfGCThreads || |
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|
5387 workers()->active_workers() == workers()->total_workers(), |
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|
5388 "If not dynamic should be using all the workers"); |
342 | 5389 workers()->run_task(&g1_par_task); |
5390 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
5391 StrongRootsScope srs(this); |
4711 | 5392 g1_par_task.set_for_termination(n_workers); |
342 | 5393 g1_par_task.work(0); |
5394 } | |
5395 | |
5396 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
5397 g1_policy()->record_par_time(par_time); | |
4095
bca17e38de00
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|
5398 |
342 | 5399 set_par_threads(0); |
1974
fd1d227ef1b9
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diff
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|
5400 |
3979
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|
5401 // Process any discovered reference objects - we have |
4dfb2df418f2
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|
5402 // to do this _before_ we retire the GC alloc regions |
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|
5403 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
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|
5404 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
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diff
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|
5405 // not copied during the pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5406 process_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5407 |
1974
fd1d227ef1b9
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diff
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|
5408 // Weak root processing. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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parents:
1973
diff
changeset
|
5409 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
5410 // non-perm oops then we will need to process the code blobs |
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diff
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|
5411 // here too. |
342 | 5412 { |
3979
4dfb2df418f2
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parents:
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changeset
|
5413 G1STWIsAliveClosure is_alive(this); |
342 | 5414 G1KeepAliveClosure keep_alive(this); |
5415 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5416 } | |
3979
4dfb2df418f2
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|
5417 |
3830
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|
5418 release_gc_alloc_regions(); |
342 | 5419 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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|
5420 |
889 | 5421 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5422 concurrent_g1_refine()->set_use_cache(true); |
5423 | |
5424 finalize_for_evac_failure(); | |
5425 | |
5426 if (evacuation_failed()) { | |
5427 remove_self_forwarding_pointers(); | |
5428 if (PrintGCDetails) { | |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
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parents:
1718
diff
changeset
|
5429 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5430 } else if (PrintGC) { |
5431 gclog_or_tty->print("--"); | |
5432 } | |
5433 } | |
5434 | |
3979
4dfb2df418f2
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diff
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|
5435 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
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3973
diff
changeset
|
5436 // reference processor's discovered lists. We need to do |
4dfb2df418f2
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diff
changeset
|
5437 // this after the card table is cleaned (and verified) as |
4dfb2df418f2
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changeset
|
5438 // the act of enqueuing entries on to the pending list |
4dfb2df418f2
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3973
diff
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|
5439 // will log these updates (and dirty their associated |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5440 // cards). We need these updates logged to update any |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5441 // RSets. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5442 enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5443 |
616
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diff
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|
5444 if (G1DeferredRSUpdate) { |
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diff
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|
5445 RedirtyLoggedCardTableEntryFastClosure redirty; |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
5446 dirty_card_queue_set().set_closure(&redirty); |
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|
5447 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5448 |
5449 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5450 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
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|
5451 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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diff
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|
5452 } |
342 | 5453 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5454 } | |
5455 | |
2173 | 5456 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5457 size_t* pre_used, |
5458 FreeRegionList* free_list, | |
4072 | 5459 OldRegionSet* old_proxy_set, |
2152 | 5460 HumongousRegionSet* humongous_proxy_set, |
2173 | 5461 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5462 bool par) { |
5463 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5464 if (hr->isHumongous()) { | |
5465 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5466 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5467 } else { | |
4072 | 5468 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5469 free_region(hr, pre_used, free_list, par); |
342 | 5470 } |
2173 | 5471 } else { |
5472 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5473 } |
5474 } | |
5475 | |
2152 | 5476 void G1CollectedHeap::free_region(HeapRegion* hr, |
5477 size_t* pre_used, | |
5478 FreeRegionList* free_list, | |
5479 bool par) { | |
5480 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5481 assert(!hr->is_empty(), "the region should not be empty"); | |
5482 assert(free_list != NULL, "pre-condition"); | |
5483 | |
5484 *pre_used += hr->used(); | |
5485 hr->hr_clear(par, true /* clear_space */); | |
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
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2369
diff
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|
5486 free_list->add_as_head(hr); |
2152 | 5487 } |
5488 | |
5489 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5490 size_t* pre_used, | |
5491 FreeRegionList* free_list, | |
5492 HumongousRegionSet* humongous_proxy_set, | |
5493 bool par) { | |
5494 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5495 assert(free_list != NULL, "pre-condition"); | |
5496 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5497 | |
5498 size_t hr_used = hr->used(); | |
5499 size_t hr_capacity = hr->capacity(); | |
5500 size_t hr_pre_used = 0; | |
5501 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5502 hr->set_notHumongous(); | |
5503 free_region(hr, &hr_pre_used, free_list, par); | |
5504 | |
3766 | 5505 size_t i = hr->hrs_index() + 1; |
2152 | 5506 size_t num = 1; |
3766 | 5507 while (i < n_regions()) { |
5508 HeapRegion* curr_hr = region_at(i); | |
2152 | 5509 if (!curr_hr->continuesHumongous()) { |
5510 break; | |
5511 } | |
5512 curr_hr->set_notHumongous(); | |
5513 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5514 num += 1; | |
5515 i += 1; | |
5516 } | |
5517 assert(hr_pre_used == hr_used, | |
5518 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5519 "should be the same", hr_pre_used, hr_used)); | |
5520 *pre_used += hr_pre_used; | |
5521 } | |
5522 | |
5523 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5524 FreeRegionList* free_list, | |
4072 | 5525 OldRegionSet* old_proxy_set, |
2152 | 5526 HumongousRegionSet* humongous_proxy_set, |
5527 bool par) { | |
5528 if (pre_used > 0) { | |
5529 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5530 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5531 assert(_summary_bytes_used >= pre_used, |
5532 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5533 "should be >= pre_used: "SIZE_FORMAT, | |
5534 _summary_bytes_used, pre_used)); | |
342 | 5535 _summary_bytes_used -= pre_used; |
2152 | 5536 } |
5537 if (free_list != NULL && !free_list->is_empty()) { | |
5538 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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|
5539 _free_list.add_as_head(free_list); |
2152 | 5540 } |
4072 | 5541 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5542 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5543 _old_set.update_from_proxy(old_proxy_set); | |
5544 } | |
2152 | 5545 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5546 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5547 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5548 } |
5549 } | |
5550 | |
796
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|
5551 class G1ParCleanupCTTask : public AbstractGangTask { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
5552 CardTableModRefBS* _ct_bs; |
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changeset
|
5553 G1CollectedHeap* _g1h; |
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|
5554 HeapRegion* volatile _su_head; |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5555 public: |
29e7d79232b9
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diff
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|
5556 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
3830
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3824
diff
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|
5557 G1CollectedHeap* g1h) : |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
5558 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
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3824
diff
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|
5559 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
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|
5560 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
5561 void work(uint worker_id) { |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
5562 HeapRegion* r; |
29e7d79232b9
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diff
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|
5563 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
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794
diff
changeset
|
5564 clear_cards(r); |
29e7d79232b9
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diff
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|
5565 } |
940
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|
5566 } |
8624da129f0b
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diff
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|
5567 |
796
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794
diff
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|
5568 void clear_cards(HeapRegion* r) { |
3830
f44782f04dd4
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3824
diff
changeset
|
5569 // Cards of the survivors should have already been dirtied. |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5570 if (!r->is_survivor()) { |
796
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diff
changeset
|
5571 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
29e7d79232b9
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|
5572 } |
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|
5573 } |
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|
5574 }; |
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|
5575 |
940
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|
5576 #ifndef PRODUCT |
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|
5577 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
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5578 G1CollectedHeap* _g1h; |
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5579 CardTableModRefBS* _ct_bs; |
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5580 public: |
3317
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5581 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
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5582 : _g1h(g1h), _ct_bs(ct_bs) { } |
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5583 virtual bool doHeapRegion(HeapRegion* r) { |
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5584 if (r->is_survivor()) { |
3317
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5585 _g1h->verify_dirty_region(r); |
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5586 } else { |
3317
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5587 _g1h->verify_not_dirty_region(r); |
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5588 } |
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5589 return false; |
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|
5590 } |
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|
5591 }; |
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|
5592 |
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5593 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
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5594 // All of the region should be clean. |
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5595 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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5596 MemRegion mr(hr->bottom(), hr->end()); |
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5597 ct_bs->verify_not_dirty_region(mr); |
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5598 } |
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5599 |
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5600 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
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5601 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
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5602 // dirty allocated blocks as they allocate them. The thread that |
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5603 // retires each region and replaces it with a new one will do a |
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5604 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
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5605 // not dirty that area (one less thing to have to do while holding |
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5606 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
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5607 // is dirty. |
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5608 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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5609 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
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|
5610 ct_bs->verify_dirty_region(mr); |
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5611 } |
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|
5612 |
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|
5613 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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5614 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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5615 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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|
5616 verify_dirty_region(hr); |
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|
5617 } |
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|
5618 } |
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|
5619 |
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|
5620 void G1CollectedHeap::verify_dirty_young_regions() { |
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5621 verify_dirty_young_list(_young_list->first_region()); |
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5622 verify_dirty_young_list(_young_list->first_survivor_region()); |
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|
5623 } |
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|
5624 #endif |
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5625 |
342 | 5626 void G1CollectedHeap::cleanUpCardTable() { |
5627 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5628 double start = os::elapsedTime(); | |
5629 | |
4023 | 5630 { |
5631 // Iterate over the dirty cards region list. | |
5632 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
5633 | |
4711 | 5634 if (G1CollectedHeap::use_parallel_gc_threads()) { |
5635 set_par_threads(); | |
4023 | 5636 workers()->run_task(&cleanup_task); |
5637 set_par_threads(0); | |
5638 } else { | |
5639 while (_dirty_cards_region_list) { | |
5640 HeapRegion* r = _dirty_cards_region_list; | |
5641 cleanup_task.clear_cards(r); | |
5642 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
5643 if (_dirty_cards_region_list == r) { | |
5644 // The last region. | |
5645 _dirty_cards_region_list = NULL; | |
5646 } | |
5647 r->set_next_dirty_cards_region(NULL); | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
5648 } |
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|
5649 } |
4023 | 5650 #ifndef PRODUCT |
5651 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
5652 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
5653 heap_region_iterate(&cleanup_verifier); | |
5654 } | |
5655 #endif | |
940
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|
5656 } |
1394
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|
5657 |
342 | 5658 double elapsed = os::elapsedTime() - start; |
3979
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6484982: G1: process references during evacuation pauses
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|
5659 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
342 | 5660 } |
5661 | |
5662 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5663 size_t pre_used = 0; |
5664 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5665 | |
342 | 5666 double young_time_ms = 0.0; |
5667 double non_young_time_ms = 0.0; | |
5668 | |
1394
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|
5669 // Since the collection set is a superset of the the young list, |
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|
5670 // all we need to do to clear the young list is clear its |
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|
5671 // head and length, and unlink any young regions in the code below |
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|
5672 _young_list->clear(); |
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|
5673 |
342 | 5674 G1CollectorPolicy* policy = g1_policy(); |
5675 | |
5676 double start_sec = os::elapsedTime(); | |
5677 bool non_young = true; | |
5678 | |
5679 HeapRegion* cur = cs_head; | |
5680 int age_bound = -1; | |
5681 size_t rs_lengths = 0; | |
5682 | |
5683 while (cur != NULL) { | |
2361 | 5684 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 5685 if (non_young) { |
5686 if (cur->is_young()) { | |
5687 double end_sec = os::elapsedTime(); | |
5688 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5689 non_young_time_ms += elapsed_ms; | |
5690 | |
5691 start_sec = os::elapsedTime(); | |
5692 non_young = false; | |
5693 } | |
5694 } else { | |
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5695 if (!cur->is_young()) { |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5696 double end_sec = os::elapsedTime(); |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5697 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5698 young_time_ms += elapsed_ms; |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5699 |
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|
5700 start_sec = os::elapsedTime(); |
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|
5701 non_young = true; |
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|
5702 } |
342 | 5703 } |
5704 | |
5705 rs_lengths += cur->rem_set()->occupied(); | |
5706 | |
5707 HeapRegion* next = cur->next_in_collection_set(); | |
5708 assert(cur->in_collection_set(), "bad CS"); | |
5709 cur->set_next_in_collection_set(NULL); | |
5710 cur->set_in_collection_set(false); | |
5711 | |
5712 if (cur->is_young()) { | |
5713 int index = cur->young_index_in_cset(); | |
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|
5714 assert(index != -1, "invariant"); |
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|
5715 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
342 | 5716 size_t words_survived = _surviving_young_words[index]; |
5717 cur->record_surv_words_in_group(words_survived); | |
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|
5718 |
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|
5719 // At this point the we have 'popped' cur from the collection set |
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|
5720 // (linked via next_in_collection_set()) but it is still in the |
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|
5721 // young list (linked via next_young_region()). Clear the |
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|
5722 // _next_young_region field. |
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|
5723 cur->set_next_young_region(NULL); |
342 | 5724 } else { |
5725 int index = cur->young_index_in_cset(); | |
4090
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|
5726 assert(index == -1, "invariant"); |
342 | 5727 } |
5728 | |
5729 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5730 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5731 "invariant" ); | |
5732 | |
5733 if (!cur->evacuation_failed()) { | |
4097
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|
5734 MemRegion used_mr = cur->used_region(); |
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|
5735 |
342 | 5736 // And the region is empty. |
4097
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|
5737 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
2152 | 5738 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 5739 } else { |
5740 cur->uninstall_surv_rate_group(); | |
4090
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|
5741 if (cur->is_young()) { |
342 | 5742 cur->set_young_index_in_cset(-1); |
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|
5743 } |
342 | 5744 cur->set_not_young(); |
5745 cur->set_evacuation_failed(false); | |
4072 | 5746 // The region is now considered to be old. |
5747 _old_set.add(cur); | |
342 | 5748 } |
5749 cur = next; | |
5750 } | |
5751 | |
5752 policy->record_max_rs_lengths(rs_lengths); | |
5753 policy->cset_regions_freed(); | |
5754 | |
5755 double end_sec = os::elapsedTime(); | |
5756 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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|
5757 |
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|
5758 if (non_young) { |
342 | 5759 non_young_time_ms += elapsed_ms; |
4097
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|
5760 } else { |
342 | 5761 young_time_ms += elapsed_ms; |
4097
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|
5762 } |
342 | 5763 |
2152 | 5764 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 5765 NULL /* old_proxy_set */, |
2152 | 5766 NULL /* humongous_proxy_set */, |
5767 false /* par */); | |
342 | 5768 policy->record_young_free_cset_time_ms(young_time_ms); |
5769 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5770 } | |
5771 | |
1394
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|
5772 // This routine is similar to the above but does not record |
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|
5773 // any policy statistics or update free lists; we are abandoning |
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|
5774 // the current incremental collection set in preparation of a |
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|
5775 // full collection. After the full GC we will start to build up |
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|
5776 // the incremental collection set again. |
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changeset
|
5777 // This is only called when we're doing a full collection |
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|
5778 // and is immediately followed by the tearing down of the young list. |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5779 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5780 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5781 HeapRegion* cur = cs_head; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5782 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5783 while (cur != NULL) { |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5784 HeapRegion* next = cur->next_in_collection_set(); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5785 assert(cur->in_collection_set(), "bad CS"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5786 cur->set_next_in_collection_set(NULL); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5787 cur->set_in_collection_set(false); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5788 cur->set_young_index_in_cset(-1); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5789 cur = next; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5790 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5791 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5792 |
2152 | 5793 void G1CollectedHeap::set_free_regions_coming() { |
5794 if (G1ConcRegionFreeingVerbose) { | |
5795 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5796 "setting free regions coming"); | |
5797 } | |
5798 | |
5799 assert(!free_regions_coming(), "pre-condition"); | |
5800 _free_regions_coming = true; | |
342 | 5801 } |
5802 | |
2152 | 5803 void G1CollectedHeap::reset_free_regions_coming() { |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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4836
diff
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|
5804 assert(free_regions_coming(), "pre-condition"); |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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|
5805 |
2152 | 5806 { |
5807 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5808 _free_regions_coming = false; | |
5809 SecondaryFreeList_lock->notify_all(); | |
5810 } | |
5811 | |
5812 if (G1ConcRegionFreeingVerbose) { | |
5813 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5814 "reset free regions coming"); | |
342 | 5815 } |
5816 } | |
5817 | |
2152 | 5818 void G1CollectedHeap::wait_while_free_regions_coming() { |
5819 // Most of the time we won't have to wait, so let's do a quick test | |
5820 // first before we take the lock. | |
5821 if (!free_regions_coming()) { | |
5822 return; | |
5823 } | |
5824 | |
5825 if (G1ConcRegionFreeingVerbose) { | |
5826 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5827 "waiting for free regions"); | |
342 | 5828 } |
5829 | |
5830 { | |
2152 | 5831 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5832 while (free_regions_coming()) { | |
5833 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5834 } |
2152 | 5835 } |
5836 | |
5837 if (G1ConcRegionFreeingVerbose) { | |
5838 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5839 "done waiting for free regions"); | |
5840 } | |
342 | 5841 } |
5842 | |
5843 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5844 assert(heap_lock_held_for_gc(), | |
5845 "the heap lock should already be held by or for this thread"); | |
5846 _young_list->push_region(hr); | |
5847 } | |
5848 | |
5849 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5850 private: | |
5851 bool _success; | |
5852 public: | |
5853 NoYoungRegionsClosure() : _success(true) { } | |
5854 bool doHeapRegion(HeapRegion* r) { | |
5855 if (r->is_young()) { | |
5856 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5857 r->bottom(), r->end()); | |
5858 _success = false; | |
5859 } | |
5860 return false; | |
5861 } | |
5862 bool success() { return _success; } | |
5863 }; | |
5864 | |
1394
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5865 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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5866 bool ret = _young_list->check_list_empty(check_sample); |
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|
5867 |
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|
5868 if (check_heap) { |
342 | 5869 NoYoungRegionsClosure closure; |
5870 heap_region_iterate(&closure); | |
5871 ret = ret && closure.success(); | |
5872 } | |
5873 | |
5874 return ret; | |
5875 } | |
5876 | |
4072 | 5877 class TearDownRegionSetsClosure : public HeapRegionClosure { |
5878 private: | |
5879 OldRegionSet *_old_set; | |
2152 | 5880 |
342 | 5881 public: |
4072 | 5882 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 5883 |
342 | 5884 bool doHeapRegion(HeapRegion* r) { |
4072 | 5885 if (r->is_empty()) { |
5886 // We ignore empty regions, we'll empty the free list afterwards | |
5887 } else if (r->is_young()) { | |
5888 // We ignore young regions, we'll empty the young list afterwards | |
5889 } else if (r->isHumongous()) { | |
5890 // We ignore humongous regions, we're not tearing down the | |
5891 // humongous region set | |
342 | 5892 } else { |
4072 | 5893 // The rest should be old |
5894 _old_set->remove(r); | |
342 | 5895 } |
5896 return false; | |
5897 } | |
5898 | |
4072 | 5899 ~TearDownRegionSetsClosure() { |
5900 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 5901 } |
342 | 5902 }; |
5903 | |
4072 | 5904 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
5905 assert_at_safepoint(true /* should_be_vm_thread */); | |
5906 | |
5907 if (!free_list_only) { | |
5908 TearDownRegionSetsClosure cl(&_old_set); | |
5909 heap_region_iterate(&cl); | |
5910 | |
5911 // Need to do this after the heap iteration to be able to | |
5912 // recognize the young regions and ignore them during the iteration. | |
5913 _young_list->empty_list(); | |
5914 } | |
5915 _free_list.remove_all(); | |
5916 } | |
5917 | |
5918 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
5919 private: | |
5920 bool _free_list_only; | |
5921 OldRegionSet* _old_set; | |
5922 FreeRegionList* _free_list; | |
5923 size_t _total_used; | |
5924 | |
5925 public: | |
5926 RebuildRegionSetsClosure(bool free_list_only, | |
5927 OldRegionSet* old_set, FreeRegionList* free_list) : | |
5928 _free_list_only(free_list_only), | |
5929 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
5930 assert(_free_list->is_empty(), "pre-condition"); | |
5931 if (!free_list_only) { | |
5932 assert(_old_set->is_empty(), "pre-condition"); | |
5933 } | |
5934 } | |
5935 | |
5936 bool doHeapRegion(HeapRegion* r) { | |
5937 if (r->continuesHumongous()) { | |
5938 return false; | |
5939 } | |
5940 | |
5941 if (r->is_empty()) { | |
5942 // Add free regions to the free list | |
5943 _free_list->add_as_tail(r); | |
5944 } else if (!_free_list_only) { | |
5945 assert(!r->is_young(), "we should not come across young regions"); | |
5946 | |
5947 if (r->isHumongous()) { | |
5948 // We ignore humongous regions, we left the humongous set unchanged | |
5949 } else { | |
5950 // The rest should be old, add them to the old set | |
5951 _old_set->add(r); | |
5952 } | |
5953 _total_used += r->used(); | |
5954 } | |
5955 | |
5956 return false; | |
5957 } | |
5958 | |
5959 size_t total_used() { | |
5960 return _total_used; | |
5961 } | |
5962 }; | |
5963 | |
5964 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
5965 assert_at_safepoint(true /* should_be_vm_thread */); | |
5966 | |
5967 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
5968 heap_region_iterate(&cl); | |
5969 | |
5970 if (!free_list_only) { | |
5971 _summary_bytes_used = cl.total_used(); | |
5972 } | |
5973 assert(_summary_bytes_used == recalculate_used(), | |
5974 err_msg("inconsistent _summary_bytes_used, " | |
5975 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
5976 _summary_bytes_used, recalculate_used())); | |
342 | 5977 } |
5978 | |
5979 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5980 _refine_cte_cl->set_concurrent(concurrent); | |
5981 } | |
5982 | |
5983 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5984 HeapRegion* hr = heap_region_containing(p); | |
5985 if (hr == NULL) { | |
5986 return is_in_permanent(p); | |
5987 } else { | |
5988 return hr->is_in(p); | |
5989 } | |
5990 } | |
2152 | 5991 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
5992 // Methods for the mutator 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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|
5993 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
5994 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
5995 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5996 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
5997 assert(!force || g1_policy()->can_expand_young_list(), |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5998 "if force is true we should be able to expand the young list"); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5999 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6000 if (force || !young_list_full) { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6001 HeapRegion* new_alloc_region = new_region(word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6002 false /* do_expand */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6003 if (new_alloc_region != NULL) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6004 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6005 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6006 return new_alloc_region; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6007 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6008 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6009 return NULL; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6010 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6011 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6012 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6013 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6014 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6015 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6016 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6017 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
6018 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6019 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6020 // We update the eden sizes here, when the region is retired, |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6021 // instead of when it's allocated, since this is the point that its |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6022 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6023 g1mm()->update_eden_size(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6024 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6025 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6026 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6027 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6028 return _g1h->new_mutator_alloc_region(word_size, force); |
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
6029 } |
abdfc822206f
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diff
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|
6030 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6031 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6032 // Don't change the number of workers. Use the value previously set |
bca17e38de00
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4090
diff
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|
6033 // in the workgroup. |
4711 | 6034 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
|
6035 uint n_workers = workers()->active_workers(); |
4711 | 6036 assert(UseDynamicNumberOfGCThreads || |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6037 n_workers == workers()->total_workers(), |
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diff
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|
6038 "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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|
6039 if (n_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6040 assert(false, "Should have been set in prior evacuation pause."); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
6041 n_workers = ParallelGCThreads; |
bca17e38de00
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4090
diff
changeset
|
6042 workers()->set_active_workers(n_workers); |
bca17e38de00
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4090
diff
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|
6043 } |
bca17e38de00
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4090
diff
changeset
|
6044 set_par_threads(n_workers); |
bca17e38de00
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4090
diff
changeset
|
6045 } |
bca17e38de00
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diff
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|
6046 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6047 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6048 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6049 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
abdfc822206f
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2432
diff
changeset
|
6050 } |
abdfc822206f
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diff
changeset
|
6051 |
3830
f44782f04dd4
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diff
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|
6052 // Methods for the GC alloc regions |
f44782f04dd4
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diff
changeset
|
6053 |
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6054 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
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6055 size_t count, |
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6056 GCAllocPurpose ap) { |
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6057 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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6058 |
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6059 if (count < g1_policy()->max_regions(ap)) { |
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6060 HeapRegion* new_alloc_region = new_region(word_size, |
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6061 true /* do_expand */); |
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6062 if (new_alloc_region != NULL) { |
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6063 // We really only need to do this for old regions given that we |
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6064 // should never scan survivors. But it doesn't hurt to do it |
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6065 // for survivors too. |
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6066 new_alloc_region->set_saved_mark(); |
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6067 if (ap == GCAllocForSurvived) { |
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6068 new_alloc_region->set_survivor(); |
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6069 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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6070 } else { |
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6071 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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6072 } |
4787
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6073 bool during_im = g1_policy()->during_initial_mark_pause(); |
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6074 new_alloc_region->note_start_of_copying(during_im); |
3830
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6075 return new_alloc_region; |
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6076 } else { |
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6077 g1_policy()->note_alloc_region_limit_reached(ap); |
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6078 } |
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6079 } |
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6080 return NULL; |
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6081 } |
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6082 |
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6083 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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6084 size_t allocated_bytes, |
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6085 GCAllocPurpose ap) { |
4787
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6086 bool during_im = g1_policy()->during_initial_mark_pause(); |
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6087 alloc_region->note_end_of_copying(during_im); |
3830
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6088 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6089 if (ap == GCAllocForSurvived) { |
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6090 young_list()->add_survivor_region(alloc_region); |
4072 | 6091 } else { |
6092 _old_set.add(alloc_region); | |
3830
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6093 } |
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6094 _hr_printer.retire(alloc_region); |
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6095 } |
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6096 |
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6097 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6098 bool force) { |
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6099 assert(!force, "not supported for GC alloc regions"); |
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6100 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6101 } |
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6102 |
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6103 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6104 size_t allocated_bytes) { |
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6105 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6106 GCAllocForSurvived); |
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6107 } |
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6108 |
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6109 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6110 bool force) { |
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6111 assert(!force, "not supported for GC alloc regions"); |
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6112 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6113 } |
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6114 |
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6115 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6116 size_t allocated_bytes) { |
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6117 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6118 GCAllocForTenured); |
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6119 } |
2433
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6120 // Heap region set verification |
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6121 |
2152 | 6122 class VerifyRegionListsClosure : public HeapRegionClosure { |
6123 private: | |
4072 | 6124 FreeRegionList* _free_list; |
6125 OldRegionSet* _old_set; | |
2152 | 6126 HumongousRegionSet* _humongous_set; |
6127 size_t _region_count; | |
6128 | |
6129 public: | |
4072 | 6130 VerifyRegionListsClosure(OldRegionSet* old_set, |
6131 HumongousRegionSet* humongous_set, | |
2152 | 6132 FreeRegionList* free_list) : |
4072 | 6133 _old_set(old_set), _humongous_set(humongous_set), |
6134 _free_list(free_list), _region_count(0) { } | |
2152 | 6135 |
6136 size_t region_count() { return _region_count; } | |
6137 | |
6138 bool doHeapRegion(HeapRegion* hr) { | |
6139 _region_count += 1; | |
6140 | |
6141 if (hr->continuesHumongous()) { | |
6142 return false; | |
6143 } | |
6144 | |
6145 if (hr->is_young()) { | |
6146 // TODO | |
6147 } else if (hr->startsHumongous()) { | |
6148 _humongous_set->verify_next_region(hr); | |
6149 } else if (hr->is_empty()) { | |
6150 _free_list->verify_next_region(hr); | |
4072 | 6151 } else { |
6152 _old_set->verify_next_region(hr); | |
2152 | 6153 } |
6154 return false; | |
6155 } | |
6156 }; | |
6157 | |
3766 | 6158 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
6159 HeapWord* bottom) { | |
6160 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6161 MemRegion mr(bottom, end); | |
6162 assert(_g1_reserved.contains(mr), "invariant"); | |
6163 // This might return NULL if the allocation fails | |
6164 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
6165 } | |
6166 | |
2152 | 6167 void G1CollectedHeap::verify_region_sets() { |
6168 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6169 | |
6170 // First, check the explicit lists. | |
6171 _free_list.verify(); | |
6172 { | |
6173 // Given that a concurrent operation might be adding regions to | |
6174 // the secondary free list we have to take the lock before | |
6175 // verifying it. | |
6176 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6177 _secondary_free_list.verify(); | |
6178 } | |
4072 | 6179 _old_set.verify(); |
2152 | 6180 _humongous_set.verify(); |
6181 | |
6182 // If a concurrent region freeing operation is in progress it will | |
6183 // be difficult to correctly attributed any free regions we come | |
6184 // across to the correct free list given that they might belong to | |
6185 // one of several (free_list, secondary_free_list, any local lists, | |
6186 // etc.). So, if that's the case we will skip the rest of the | |
6187 // verification operation. Alternatively, waiting for the concurrent | |
6188 // operation to complete will have a non-trivial effect on the GC's | |
6189 // operation (no concurrent operation will last longer than the | |
6190 // interval between two calls to verification) and it might hide | |
6191 // any issues that we would like to catch during testing. | |
6192 if (free_regions_coming()) { | |
6193 return; | |
6194 } | |
6195 | |
2361 | 6196 // Make sure we append the secondary_free_list on the free_list so |
6197 // that all free regions we will come across can be safely | |
6198 // attributed to the free_list. | |
6199 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6200 |
6201 // Finally, make sure that the region accounting in the lists is | |
6202 // consistent with what we see in the heap. | |
4072 | 6203 _old_set.verify_start(); |
2152 | 6204 _humongous_set.verify_start(); |
6205 _free_list.verify_start(); | |
6206 | |
4072 | 6207 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6208 heap_region_iterate(&cl); |
6209 | |
4072 | 6210 _old_set.verify_end(); |
2152 | 6211 _humongous_set.verify_end(); |
6212 _free_list.verify_end(); | |
342 | 6213 } |